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roc/reporting/tests/test_reporting.rs

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#[macro_use]
extern crate pretty_assertions;
extern crate bumpalo;
extern crate indoc;
extern crate roc_reporting;
mod helpers;
#[cfg(test)]
mod test_reporting {
use crate::helpers::{can_expr, infer_expr, test_home, CanExprOut, ParseErrOut};
use bumpalo::Bump;
use indoc::indoc;
use roc_can::abilities::AbilitiesStore;
use roc_can::def::Declaration;
use roc_can::pattern::Pattern;
use roc_load::{self, LoadedModule, LoadingProblem};
use roc_module::symbol::{Interns, ModuleId};
use roc_mono::ir::{Procs, Stmt, UpdateModeIds};
use roc_mono::layout::LayoutCache;
use roc_region::all::LineInfo;
use roc_reporting::report::{
can_problem, mono_problem, parse_problem, type_problem, RenderTarget, Report, Severity,
ANSI_STYLE_CODES, DEFAULT_PALETTE,
};
use roc_reporting::report::{RocDocAllocator, RocDocBuilder};
use roc_solve::solve;
use roc_test_utils::assert_multiline_str_eq;
use roc_types::pretty_print::name_all_type_vars;
use roc_types::subs::Subs;
use std::path::PathBuf;
fn filename_from_string(str: &str) -> PathBuf {
let mut filename = PathBuf::new();
filename.push(str);
filename
}
fn to_simple_report(doc: RocDocBuilder) -> Report {
Report {
title: "".to_string(),
doc,
filename: filename_from_string(r"\code\proj\Main.roc"),
severity: Severity::RuntimeError,
}
}
fn promote_expr_to_module(src: &str) -> String {
let mut buffer =
String::from("app \"test\" provides [ main ] to \"./platform\"\n\nmain =\n");
for line in src.lines() {
// indent the body!
buffer.push_str(" ");
buffer.push_str(line);
buffer.push('\n');
}
buffer
}
fn run_load_and_infer<'a>(
arena: &'a Bump,
src: &'a str,
) -> (String, Result<LoadedModule, LoadingProblem<'a>>) {
use std::fs::File;
use std::io::Write;
use tempfile::tempdir;
let module_src = if src.starts_with("app") {
// this is already a module
src.to_string()
} else {
// this is an expression, promote it to a module
promote_expr_to_module(src)
};
let exposed_types = Default::default();
let loaded = {
let dir = tempdir().unwrap();
let filename = PathBuf::from("Test.roc");
let file_path = dir.path().join(filename);
let full_file_path = file_path.clone();
let mut file = File::create(file_path).unwrap();
writeln!(file, "{}", module_src).unwrap();
let result = roc_load::load_and_typecheck(
arena,
full_file_path,
dir.path(),
exposed_types,
roc_target::TargetInfo::default_x86_64(),
RenderTarget::Generic,
);
drop(file);
dir.close().unwrap();
result
};
(module_src, loaded)
}
fn infer_expr_help_new<'a>(
arena: &'a Bump,
expr_src: &'a str,
) -> Result<
(
String,
Vec<solve::TypeError>,
Vec<roc_problem::can::Problem>,
Vec<roc_mono::ir::MonoProblem>,
ModuleId,
Interns,
),
LoadingProblem<'a>,
> {
let (module_src, result) = run_load_and_infer(arena, expr_src);
let LoadedModule {
module_id: home,
mut can_problems,
mut type_problems,
interns,
mut solved,
exposed_to_host,
mut declarations_by_id,
..
} = result?;
let can_problems = can_problems.remove(&home).unwrap_or_default();
let type_problems = type_problems.remove(&home).unwrap_or_default();
let subs = solved.inner_mut();
for var in exposed_to_host.values() {
name_all_type_vars(*var, subs);
}
let mut mono_problems = Vec::new();
// MONO
if type_problems.is_empty() && can_problems.is_empty() {
let arena = Bump::new();
assert!(exposed_to_host.len() == 1);
let (sym, _var) = exposed_to_host.into_iter().next().unwrap();
let home_decls = declarations_by_id.remove(&home).unwrap();
let (loc_expr, var) = home_decls
.into_iter()
.find_map(|decl| match decl {
Declaration::Declare(def) => match def.loc_pattern.value {
Pattern::Identifier(s) if s == sym => Some((def.loc_expr, def.expr_var)),
_ => None,
},
_ => None,
})
.expect("No expression to monomorphize found!");
// Compile and add all the Procs before adding main
let mut procs = Procs::new_in(&arena);
let mut ident_ids = interns.all_ident_ids.get(&home).unwrap().clone();
let mut update_mode_ids = UpdateModeIds::new();
// Populate Procs and Subs, and get the low-level Expr from the canonical Expr
let target_info = roc_target::TargetInfo::default_x86_64();
let mut layout_cache = LayoutCache::new(target_info);
let mut mono_env = roc_mono::ir::Env {
arena: &arena,
subs,
problems: &mut mono_problems,
home,
ident_ids: &mut ident_ids,
update_mode_ids: &mut update_mode_ids,
target_info,
// call_specialization_counter=0 is reserved
call_specialization_counter: 1,
};
let _mono_expr = Stmt::new(
&mut mono_env,
loc_expr.value,
var,
&mut procs,
&mut layout_cache,
);
}
Ok((
module_src,
type_problems,
can_problems,
mono_problems,
home,
interns,
))
}
fn list_reports_new<F>(arena: &Bump, src: &str, finalize_render: F) -> String
where
F: FnOnce(RocDocBuilder<'_>, &mut String),
{
use ven_pretty::DocAllocator;
let filename = filename_from_string(r"\code\proj\Main.roc");
let mut buf = String::new();
match infer_expr_help_new(arena, src) {
Err(LoadingProblem::FormattedReport(fail)) => fail,
Ok((module_src, type_problems, can_problems, mono_problems, home, interns)) => {
let lines = LineInfo::new(&module_src);
let src_lines: Vec<&str> = module_src.split('\n').collect();
let mut reports = Vec::new();
let alloc = RocDocAllocator::new(&src_lines, home, &interns);
for problem in can_problems {
let report = can_problem(&alloc, &lines, filename.clone(), problem.clone());
reports.push(report);
}
for problem in type_problems {
if let Some(report) =
type_problem(&alloc, &lines, filename.clone(), problem.clone())
{
reports.push(report);
}
}
for problem in mono_problems {
let report = mono_problem(&alloc, &lines, filename.clone(), problem.clone());
reports.push(report);
}
let has_reports = !reports.is_empty();
let doc = alloc
.stack(reports.into_iter().map(|v| v.pretty(&alloc)))
.append(if has_reports {
alloc.line()
} else {
alloc.nil()
});
finalize_render(doc, &mut buf);
buf
}
Err(other) => {
assert!(false, "failed to load: {:?}", other);
unreachable!()
}
}
}
fn infer_expr_help<'a>(
arena: &'a Bump,
expr_src: &'a str,
) -> Result<
(
Vec<solve::TypeError>,
Vec<roc_problem::can::Problem>,
Vec<roc_mono::ir::MonoProblem>,
ModuleId,
Interns,
),
ParseErrOut<'a>,
> {
let CanExprOut {
loc_expr,
output,
var_store,
var,
constraints,
constraint,
home,
interns,
problems: can_problems,
..
} = can_expr(arena, expr_src)?;
let mut subs = Subs::new_from_varstore(var_store);
for named in output.introduced_variables.named {
subs.rigid_var(named.variable, named.name);
}
for var in output.introduced_variables.wildcards {
subs.rigid_var(var.value, "*".into());
}
let mut solve_aliases = roc_solve::solve::Aliases::default();
for (name, alias) in output.aliases {
solve_aliases.insert(name, alias);
}
let mut unify_problems = Vec::new();
let mut abilities_store = AbilitiesStore::default();
let (_content, mut subs) = infer_expr(
subs,
&mut unify_problems,
&constraints,
&constraint,
&mut solve_aliases,
&mut abilities_store,
var,
);
name_all_type_vars(var, &mut subs);
let mut mono_problems = Vec::new();
// MONO
if unify_problems.is_empty() && can_problems.is_empty() {
let arena = Bump::new();
// Compile and add all the Procs before adding main
let mut procs = Procs::new_in(&arena);
let mut ident_ids = interns.all_ident_ids.get(&home).unwrap().clone();
let mut update_mode_ids = UpdateModeIds::new();
// Populate Procs and Subs, and get the low-level Expr from the canonical Expr
let target_info = roc_target::TargetInfo::default_x86_64();
let mut layout_cache = LayoutCache::new(target_info);
let mut mono_env = roc_mono::ir::Env {
arena: &arena,
subs: &mut subs,
problems: &mut mono_problems,
home,
ident_ids: &mut ident_ids,
update_mode_ids: &mut update_mode_ids,
target_info,
// call_specialization_counter=0 is reserved
call_specialization_counter: 1,
};
let _mono_expr = Stmt::new(
&mut mono_env,
loc_expr.value,
var,
&mut procs,
&mut layout_cache,
);
}
Ok((unify_problems, can_problems, mono_problems, home, interns))
}
fn list_reports<F>(arena: &Bump, src: &str, buf: &mut String, callback: F)
where
F: FnOnce(RocDocBuilder<'_>, &mut String),
{
use ven_pretty::DocAllocator;
let src_lines: Vec<&str> = src.split('\n').collect();
let lines = LineInfo::new(src);
let filename = filename_from_string(r"\code\proj\Main.roc");
match infer_expr_help(arena, src) {
Err(parse_err) => {
let ParseErrOut {
fail,
home,
interns,
} = parse_err;
let alloc = RocDocAllocator::new(&src_lines, home, &interns);
let problem = fail.into_file_error(filename.clone());
let doc = parse_problem(&alloc, &lines, filename, 0, problem);
callback(doc.pretty(&alloc).append(alloc.line()), buf)
}
Ok((type_problems, can_problems, mono_problems, home, interns)) => {
let mut reports = Vec::new();
let alloc = RocDocAllocator::new(&src_lines, home, &interns);
for problem in can_problems {
let report = can_problem(&alloc, &lines, filename.clone(), problem.clone());
reports.push(report);
}
for problem in type_problems {
if let Some(report) =
type_problem(&alloc, &lines, filename.clone(), problem.clone())
{
reports.push(report);
}
}
for problem in mono_problems {
let report = mono_problem(&alloc, &lines, filename.clone(), problem.clone());
reports.push(report);
}
let has_reports = !reports.is_empty();
let doc = alloc
.stack(reports.into_iter().map(|v| v.pretty(&alloc)))
.append(if has_reports {
alloc.line()
} else {
alloc.nil()
});
callback(doc, buf)
}
}
}
fn list_header_reports<F>(arena: &Bump, src: &str, buf: &mut String, callback: F)
where
F: FnOnce(RocDocBuilder<'_>, &mut String),
{
use ven_pretty::DocAllocator;
use roc_parse::state::State;
let state = State::new(src.as_bytes());
let filename = filename_from_string(r"\code\proj\Main.roc");
let src_lines: Vec<&str> = src.split('\n').collect();
let lines = LineInfo::new(src);
match roc_parse::module::parse_header(arena, state) {
Err(fail) => {
let interns = Interns::default();
let home = crate::helpers::test_home();
let alloc = RocDocAllocator::new(&src_lines, home, &interns);
use roc_parse::parser::SyntaxError;
let problem = fail
.map_problem(SyntaxError::Header)
.into_file_error(filename.clone());
let doc = parse_problem(&alloc, &lines, filename, 0, problem);
callback(doc.pretty(&alloc).append(alloc.line()), buf)
}
Ok(_) => todo!(),
}
}
fn report_problem_as(src: &str, expected_rendering: &str) {
let mut buf: String = String::new();
let arena = Bump::new();
let callback = |doc: RocDocBuilder<'_>, buf: &mut String| {
doc.1
.render_raw(70, &mut roc_reporting::report::CiWrite::new(buf))
.expect("list_reports")
};
list_reports(&arena, src, &mut buf, callback);
// convenient to copy-paste the generated message
if true && buf != expected_rendering {
for line in buf.split('\n') {
println!(" {}", line);
}
}
assert_multiline_str_eq!(expected_rendering, buf.as_str());
}
fn report_header_problem_as(src: &str, expected_rendering: &str) {
let mut buf: String = String::new();
let arena = Bump::new();
let callback = |doc: RocDocBuilder<'_>, buf: &mut String| {
doc.1
.render_raw(70, &mut roc_reporting::report::CiWrite::new(buf))
.expect("list_reports")
};
list_header_reports(&arena, src, &mut buf, callback);
// convenient to copy-paste the generated message
if true && buf != expected_rendering {
for line in buf.split('\n') {
println!(" {}", line);
}
}
assert_eq!(buf, expected_rendering);
}
fn color_report_problem_as(src: &str, expected_rendering: &str) {
let mut buf: String = String::new();
let arena = Bump::new();
let callback = |doc: RocDocBuilder<'_>, buf: &mut String| {
doc.1
.render_raw(
70,
&mut roc_reporting::report::ColorWrite::new(
&roc_reporting::report::DEFAULT_PALETTE,
buf,
),
)
.expect("list_reports")
};
list_reports(&arena, src, &mut buf, callback);
let readable = human_readable(&buf);
assert_eq!(readable, expected_rendering);
}
fn new_report_problem_as(src: &str, expected_rendering: &str) {
let arena = Bump::new();
let finalize_render = |doc: RocDocBuilder<'_>, buf: &mut String| {
doc.1
.render_raw(70, &mut roc_reporting::report::CiWrite::new(buf))
.expect("list_reports")
};
let buf = list_reports_new(&arena, src, finalize_render);
// convenient to copy-paste the generated message
if buf != expected_rendering {
for line in buf.split('\n') {
println!(" {}", line);
}
}
assert_multiline_str_eq!(expected_rendering, buf.as_str());
}
fn human_readable(str: &str) -> String {
str.replace(ANSI_STYLE_CODES.red, "<red>")
.replace(ANSI_STYLE_CODES.white, "<white>")
.replace(ANSI_STYLE_CODES.blue, "<blue>")
.replace(ANSI_STYLE_CODES.yellow, "<yellow>")
.replace(ANSI_STYLE_CODES.green, "<green>")
.replace(ANSI_STYLE_CODES.cyan, "<cyan>")
.replace(ANSI_STYLE_CODES.magenta, "<magenta>")
.replace(ANSI_STYLE_CODES.reset, "<reset>")
.replace(ANSI_STYLE_CODES.bold, "<bold>")
.replace(ANSI_STYLE_CODES.underline, "<underline>")
}
#[test]
fn value_not_exposed() {
report_problem_as(
indoc!(
r#"
List.isempty 1 2
"#
),
indoc!(
r#"
── NOT EXPOSED ─────────────────────────────────────────────────────────────────
The List module does not expose `isempty`:
1│ List.isempty 1 2
^^^^^^^^^^^^
Did you mean one of these?
List.isEmpty
List.set
List.get
List.keepIf
"#
),
)
}
#[test]
fn report_unused_def() {
report_problem_as(
indoc!(
r#"
x = 1
y = 2
x
"#
),
indoc!(
r#"
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`y` is not used anywhere in your code.
2│ y = 2
^
If you didn't intend on using `y` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn report_shadowing() {
report_problem_as(
indoc!(
r#"
i = 1
s = \i ->
i + 1
s i
"#
),
indoc!(
r#"
── DUPLICATE NAME ──────────────────────────────────────────────────────────────
The `i` name is first defined here:
1│ i = 1
^
But then it's defined a second time here:
3│ s = \i ->
^
Since these variables have the same name, it's easy to use the wrong
one on accident. Give one of them a new name.
"#
),
)
}
#[test]
fn report_shadowing_in_annotation() {
report_problem_as(
indoc!(
r#"
Booly : [ Yes, No ]
Booly : [ Yes, No, Maybe ]
x =
No
x
"#
),
// Booly is called a "variable"
indoc!(
r#"
── DUPLICATE NAME ──────────────────────────────────────────────────────────────
The `Booly` name is first defined here:
1│ Booly : [ Yes, No ]
^^^^^^^^^^^^^^^^^^^
But then it's defined a second time here:
3│ Booly : [ Yes, No, Maybe ]
^^^^^^^^^^^^^^^^^^^^^^^^^^
Since these aliases have the same name, it's easy to use the wrong one
on accident. Give one of them a new name.
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`Booly` is not used anywhere in your code.
1│ Booly : [ Yes, No ]
^^^^^^^^^^^^^^^^^^^
If you didn't intend on using `Booly` then remove it so future readers
of your code don't wonder why it is there.
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`Booly` is not used anywhere in your code.
3│ Booly : [ Yes, No, Maybe ]
^^^^^^^^^^^^^^^^^^^^^^^^^^
If you didn't intend on using `Booly` then remove it so future readers
of your code don't wonder why it is there.
"#
),
)
}
// #[test]
// fn report_multi_line_shadowing_in_annotation() {
// report_problem_as(
// indoc!(
// r#"
// Booly :
// [
// Yes,
// No
// ]
//
// Booly :
// [
// Yes,
// No,
// Maybe
// ]
//
// x =
// No
//
// x
// "#
// ),
// indoc!(
// r#"
// Booly is first defined here:
//
// 1│> Booly :
// 2│> [
// 3│> Yes,
// 4│> No
// 5│> ]
//
// But then it's defined a second time here:
//
// 7 │> Booly :
// 8 │> [
// 9 │> Yes,
// 10│> No,
// 11│> Maybe
// 12│> ]
//
// Since these variables have the same name, it's easy to use the wrong one on accident. Give one of them a new name."#
// ),
// )
// }
// #[test]
// fn report_unsupported_top_level_def() {
// report_problem_as(
// indoc!(
// r#"
// x = 1
//
// 5 = 2 + 1
//
// x
// "#
// ),
// indoc!(r#" "#),
// )
// }
#[test]
fn report_precedence_problem_single_line() {
report_problem_as(
indoc!(
r#"x = 1
y =
if selectedId != thisId == adminsId then
4
else
5
{ x, y }
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
Using != and == together requires parentheses, to clarify how they
should be grouped.
3│ if selectedId != thisId == adminsId then
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"#
),
)
}
#[test]
fn unrecognized_name() {
report_problem_as(
indoc!(
r#"
foo = { x: 1 == 1, y: 0x4 }
baz = 3
main : Str
main =
when foo.y is
4 -> bar baz "yay"
_ -> "nay"
main
"#
),
indoc!(
r#"
── UNRECOGNIZED NAME ───────────────────────────────────────────────────────────
I cannot find a `bar` value
8│ 4 -> bar baz "yay"
^^^
Did you mean one of these?
baz
Nat
Str
Err
"#
),
)
}
#[test]
fn lowercase_primitive_tag_bool() {
report_problem_as(
indoc!(
r#"
if true then 1 else 2
"#
),
indoc!(
r#"
── UNRECOGNIZED NAME ───────────────────────────────────────────────────────────
I cannot find a `true` value
1│ if true then 1 else 2
^^^^
Did you mean one of these?
True
Str
Num
Err
"#
),
)
}
#[test]
fn report_precedence_problem_multiline() {
report_problem_as(
indoc!(
r#"
if
1
== 2
== 3
then
2
else
3
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
Using more than one == like this requires parentheses, to clarify how
things should be grouped.
2│> 1
3│> == 2
4│> == 3
"#
),
)
}
#[test]
fn unused_arg_and_unused_def() {
report_problem_as(
indoc!(
r#"
y = 9
box = \class, htmlChildren ->
div [ class ] []
div = \_, _ -> 4
box "wizard" []
"#
),
indoc!(
r#"
── UNUSED ARGUMENT ─────────────────────────────────────────────────────────────
`box` doesn't use `htmlChildren`.
3│ box = \class, htmlChildren ->
^^^^^^^^^^^^
If you don't need `htmlChildren`, then you can just remove it. However,
if you really do need `htmlChildren` as an argument of `box`, prefix it
with an underscore, like this: "_`htmlChildren`". Adding an underscore
at the start of a variable name is a way of saying that the variable
is not used.
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`y` is not used anywhere in your code.
1│ y = 9
^
If you didn't intend on using `y` then remove it so future readers of
your code don't wonder why it is there.
"#
),
);
}
#[test]
fn report_value_color() {
let src: &str = indoc!(
r#"
activityIndicatorLarge = div
view activityIndicatorLarge
"#
);
let arena = Bump::new();
let (_type_problems, _can_problems, _mono_problems, home, interns) =
infer_expr_help(&arena, src).expect("parse error");
let mut buf = String::new();
let src_lines: Vec<&str> = src.split('\n').collect();
let alloc = RocDocAllocator::new(&src_lines, home, &interns);
let symbol = interns.symbol(test_home(), "activityIndicatorLarge".into());
to_simple_report(alloc.symbol_unqualified(symbol)).render_color_terminal(
&mut buf,
&alloc,
&DEFAULT_PALETTE,
);
assert_eq!(human_readable(&buf), "<blue>activityIndicatorLarge<reset>");
}
#[test]
fn report_module_color() {
let src: &str = indoc!(
r#"
x = 1
y = 2
x
"#
);
let arena = Bump::new();
let (_type_problems, _can_problems, _mono_problems, home, mut interns) =
infer_expr_help(&arena, src).expect("parse error");
let mut buf = String::new();
let src_lines: Vec<&str> = src.split('\n').collect();
let module_id = interns.module_id(&"Util.Int".into());
let alloc = RocDocAllocator::new(&src_lines, home, &interns);
to_simple_report(alloc.module(module_id)).render_color_terminal(
&mut buf,
&alloc,
&DEFAULT_PALETTE,
);
assert_eq!(human_readable(&buf), "<green>Util.Int<reset>");
}
#[test]
fn report_region_in_color() {
color_report_problem_as(
indoc!(
r#"
isDisabled = \user -> user.isAdmin
theAdmin
|> isDisabled
"#
),
indoc!(
r#"
<cyan>── UNRECOGNIZED NAME ───────────────────────────────────────────────────────────<reset>
I cannot find a `theAdmin` value
<cyan>3<reset><cyan>│<reset> <white>theAdmin<reset>
<red>^^^^^^^^<reset>
Did you mean one of these?
Decimal
Dec
Result
Num
"#
),
);
}
// #[test]
// fn shadowing_type_alias() {
// report_problem_as(
// indoc!(
// r#"
// foo : I64 as I64
// foo = 42
// foo
// "#
// ),
// indoc!(
// r#"
// You cannot mix (!=) and (==) without parentheses
// 3│ if selectedId != thisId == adminsId then
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
// "#
// ),
// )
// }
// #[test]
// fn invalid_as_type_alias() {
// report_problem_as(
// indoc!(
// r#"
// foo : I64 as a
// foo = 42
// foo
// "#
// ),
// indoc!(
// r#"
// You cannot mix (!=) and (==) without parentheses
// 3│ if selectedId != thisId == adminsId then
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
// "#
// ),
// )
// }
#[test]
fn if_condition_not_bool() {
report_problem_as(
indoc!(
r#"
if "foo" then 2 else 3
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This `if` condition needs to be a Bool:
1│ if "foo" then 2 else 3
^^^^^
Right now it’s a string of type:
Str
But I need every `if` condition to evaluate to a Bool—either `True` or
`False`.
"#
),
)
}
#[test]
fn when_if_guard() {
report_problem_as(
indoc!(
r#"
when 1 is
2 if 1 -> 0x0
_ -> 0x1
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This `if` guard condition needs to be a Bool:
1│ when 1 is
2│> 2 if 1 -> 0x0
3│ _ -> 0x1
Right now it’s a number of type:
Num a
But I need every `if` guard condition to evaluate to a Bool—either
`True` or `False`.
"#
),
)
}
#[test]
fn if_2_branch_mismatch() {
report_problem_as(
indoc!(
r#"
if True then 2 else "foo"
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This `if` has an `else` branch with a different type from its `then` branch:
1│ if True then 2 else "foo"
^^^^^
The `else` branch is a string of type:
Str
but the `then` branch has the type:
Num a
I need all branches in an `if` to have the same type!
"#
),
)
}
#[test]
fn if_3_branch_mismatch() {
report_problem_as(
indoc!(
r#"
if True then 2 else if False then 2 else "foo"
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 3rd branch of this `if` does not match all the previous branches:
1│ if True then 2 else if False then 2 else "foo"
^^^^^
The 3rd branch is a string of type:
Str
But all the previous branches have type:
Num a
I need all branches in an `if` to have the same type!
"#
),
)
}
#[test]
fn when_branch_mismatch() {
report_problem_as(
indoc!(
r#"
when 1 is
2 -> "foo"
3 -> {}
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd branch of this `when` does not match all the previous branches:
1│ when 1 is
2│ 2 -> "foo"
3│ 3 -> {}
^^
The 2nd branch is a record of type:
{}
But all the previous branches have type:
Str
I need all branches of a `when` to have the same type!
"#
),
)
}
#[test]
fn elem_in_list() {
report_problem_as(
indoc!(
r#"
[ 1, 3, "foo" ]
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This list contains elements with different types:
1│ [ 1, 3, "foo" ]
^^^^^
Its 3rd element is a string of type:
Str
However, the preceding elements in the list all have the type:
Num a
I need every element in a list to have the same type!
"#
),
)
}
#[test]
fn record_update_value() {
report_problem_as(
indoc!(
r#"
x : { foo : {} }
x = { foo: {} }
{ x & foo: "bar" }
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
I cannot update the `.foo` field like this:
4│ { x & foo: "bar" }
^^^^^
You are trying to update `.foo` to be a string of type:
Str
But it should be:
{}
Record update syntax does not allow you to change the type of fields.
You can achieve that with record literal syntax.
"#
),
)
}
#[test]
fn circular_type() {
report_problem_as(
indoc!(
r#"
f = \g -> g g
f
"#
),
indoc!(
r#"
── CIRCULAR TYPE ───────────────────────────────────────────────────────────────
I'm inferring a weird self-referential type for `g`:
1│ f = \g -> g g
^
Here is my best effort at writing down the type. You will see ∞ for
parts of the type that repeat something already printed out
infinitely.
∞ -> a
"#
),
)
}
#[test]
fn polymorphic_recursion() {
report_problem_as(
indoc!(
r#"
f = \x -> f [x]
f
"#
),
indoc!(
r#"
── CIRCULAR TYPE ───────────────────────────────────────────────────────────────
I'm inferring a weird self-referential type for `f`:
1│ f = \x -> f [x]
^
Here is my best effort at writing down the type. You will see ∞ for
parts of the type that repeat something already printed out
infinitely.
List ∞ -> a
"#
),
)
}
#[test]
fn record_field_mismatch() {
report_problem_as(
indoc!(
r#"
bar = { bar : 0x3 }
f : { foo : Int * } -> Bool
f = \_ -> True
f bar
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `f` is not what I expect:
6│ f bar
^^^
This `bar` value is a:
{ bar : Int a }
But `f` needs the 1st argument to be:
{ foo : Int * }
Tip: Seems like a record field typo. Maybe `bar` should be `foo`?
Tip: Can more type annotations be added? Type annotations always help
me give more specific messages, and I think they could help a lot in
this case
"#
),
)
}
#[test]
fn tag_mismatch() {
report_problem_as(
indoc!(
r#"
f : [ Red, Green ] -> Bool
f = \_ -> True
f Blue
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `f` is not what I expect:
4│ f Blue
^^^^
This `Blue` global tag has the type:
[ Blue ]a
But `f` needs the 1st argument to be:
[ Green, Red ]
Tip: Seems like a tag typo. Maybe `Blue` should be `Red`?
Tip: Can more type annotations be added? Type annotations always help
me give more specific messages, and I think they could help a lot in
this case
"#
),
)
}
#[test]
fn tag_with_arguments_mismatch() {
report_problem_as(
indoc!(
r#"
f : [ Red (Int *), Green Bool ] -> Bool
f = \_ -> True
f (Blue 3.14)
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `f` is not what I expect:
4│ f (Blue 3.14)
^^^^^^^^^
This `Blue` global tag application has the type:
[ Blue (Float a) ]b
But `f` needs the 1st argument to be:
[ Green Bool, Red (Int *) ]
Tip: Seems like a tag typo. Maybe `Blue` should be `Red`?
Tip: Can more type annotations be added? Type annotations always help
me give more specific messages, and I think they could help a lot in
this case
"#
),
)
}
#[test]
fn from_annotation_if() {
report_problem_as(
indoc!(
r#"
x : Int *
x = if True then 3.14 else 4
x
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the `then` branch of this `if` expression:
1│ x : Int *
2│ x = if True then 3.14 else 4
^^^^
The 1st branch is a float of type:
Float a
But the type annotation on `x` says it should be:
Int *
Tip: You can convert between Int and Float using functions like
`Num.toFloat` and `Num.round`.
"#
),
)
}
#[test]
fn from_annotation_when() {
report_problem_as(
indoc!(
r#"
x : Int *
x =
when True is
_ -> 3.14
x
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `x` definition:
1│ x : Int *
2│ x =
3│> when True is
4│> _ -> 3.14
This `when` expression produces:
Float a
But the type annotation on `x` says it should be:
Int *
Tip: You can convert between Int and Float using functions like
`Num.toFloat` and `Num.round`.
"#
),
)
}
#[test]
fn from_annotation_function() {
report_problem_as(
indoc!(
r#"
x : Int * -> Int *
x = \_ -> 3.14
x
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `x` definition:
1│ x : Int * -> Int *
2│ x = \_ -> 3.14
^^^^
The body is a float of type:
Float a
But the type annotation on `x` says it should be:
Int *
Tip: You can convert between Int and Float using functions like
`Num.toFloat` and `Num.round`.
"#
),
)
}
#[test]
fn fncall_value() {
report_problem_as(
indoc!(
r#"
x : I64
x = 42
x 3
"#
),
indoc!(
r#"
── TOO MANY ARGS ───────────────────────────────────────────────────────────────
The `x` value is not a function, but it was given 1 argument:
4│ x 3
^
Are there any missing commas? Or missing parentheses?
"#
),
)
}
#[test]
fn fncall_overapplied() {
report_problem_as(
indoc!(
r#"
f : I64 -> I64
f = \_ -> 42
f 1 2
"#
),
indoc!(
r#"
── TOO MANY ARGS ───────────────────────────────────────────────────────────────
The `f` function expects 1 argument, but it got 2 instead:
4│ f 1 2
^
Are there any missing commas? Or missing parentheses?
"#
),
)
}
#[test]
fn fncall_underapplied() {
report_problem_as(
indoc!(
r#"
f : I64, I64 -> I64
f = \_, _ -> 42
f 1
"#
),
indoc!(
r#"
── TOO FEW ARGS ────────────────────────────────────────────────────────────────
The `f` function expects 2 arguments, but it got only 1:
4│ f 1
^
Roc does not allow functions to be partially applied. Use a closure to
make partial application explicit.
"#
),
)
}
#[test]
fn pattern_when_condition() {
report_problem_as(
indoc!(
r#"
when 1 is
{} -> 42
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
2│ {} -> 42
^^
The first pattern is trying to match record values of type:
{}a
But the expression between `when` and `is` has the type:
Num a
"#
),
)
}
#[test]
fn pattern_when_pattern() {
report_problem_as(
indoc!(
r#"
when 1 is
2 -> 3
{} -> 42
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd pattern in this `when` does not match the previous ones:
3│ {} -> 42
^^
The 2nd pattern is trying to match record values of type:
{}a
But all the previous branches match:
Num a
"#
),
)
}
#[test]
fn pattern_guard_mismatch_alias() {
report_problem_as(
indoc!(
r#"
when { foo: 1 } is
{ foo: True } -> 42
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
2│ { foo: True } -> 42
^^^^^^^^^^^^^
The first pattern is trying to match record values of type:
{ foo : [ True ] }
But the expression between `when` and `is` has the type:
{ foo : Num a }
"#
),
)
}
#[test]
fn pattern_guard_mismatch() {
report_problem_as(
indoc!(
r#"
when { foo: "" } is
{ foo: True } -> 42
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
2│ { foo: True } -> 42
^^^^^^^^^^^^^
The first pattern is trying to match record values of type:
{ foo : [ True ] }
But the expression between `when` and `is` has the type:
{ foo : Str }
"#
),
)
}
#[test]
fn pattern_guard_does_not_bind_label() {
// needs some improvement, but the principle works
report_problem_as(
indoc!(
r#"
when { foo: 1 } is
{ foo: 2 } -> foo
"#
),
indoc!(
r#"
── UNRECOGNIZED NAME ───────────────────────────────────────────────────────────
I cannot find a `foo` value
2│ { foo: 2 } -> foo
^^^
Did you mean one of these?
Box
Bool
U8
F64
"#
),
)
}
#[test]
fn pattern_guard_can_be_shadowed_above() {
report_problem_as(
indoc!(
r#"
foo = 3
when { foo: 1 } is
{ foo: 2 } -> foo
_ -> foo
"#
),
// should give no error
"",
)
}
#[test]
fn pattern_guard_can_be_shadowed_below() {
report_problem_as(
indoc!(
r#"
when { foo: 1 } is
{ foo: 2 } ->
foo = 3
foo
_ -> 3
"#
),
// should give no error
"",
)
}
#[test]
fn pattern_or_pattern_mismatch() {
report_problem_as(
indoc!(
r#"
when { foo: 1 } is
{} | 1 -> 3
"#
),
// Just putting this here. We should probably handle or-patterns better
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
2│ {} | 1 -> 3
^^^^^^
The first pattern is trying to match numbers:
Num a
But the expression between `when` and `is` has the type:
{ foo : Num a }
"#
),
)
}
#[test]
fn pattern_let_mismatch() {
report_problem_as(
indoc!(
r#"
(Foo x) = 42
x
"#
),
// Maybe this should specifically say the pattern doesn't work?
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This expression is used in an unexpected way:
1│ (Foo x) = 42
^^
It is a number of type:
Num a
But you are trying to use it as:
[ Foo a ]
"#
),
)
}
#[test]
fn from_annotation_complex_pattern() {
report_problem_as(
indoc!(
r#"
{ x } : { x : Int * }
{ x } = { x: 4.0 }
x
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of this definition:
1│ { x } : { x : Int * }
2│ { x } = { x: 4.0 }
^^^^^^^^^^
The body is a record of type:
{ x : Float a }
But the type annotation says it should be:
{ x : Int * }
Tip: You can convert between Int and Float using functions like
`Num.toFloat` and `Num.round`.
"#
),
)
}
#[test]
fn malformed_int_pattern() {
report_problem_as(
indoc!(
r#"
when 1 is
100A -> 3
_ -> 4
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer pattern is malformed:
2│ 100A -> 3
^^^^
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn malformed_float_pattern() {
report_problem_as(
indoc!(
r#"
when 1 is
2.X -> 3
_ -> 4
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This float pattern is malformed:
2│ 2.X -> 3
^^^
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn malformed_hex_pattern() {
report_problem_as(
indoc!(
r#"
when 1 is
0xZ -> 3
_ -> 4
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This hex integer pattern is malformed:
2│ 0xZ -> 3
^^^
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn malformed_oct_pattern() {
report_problem_as(
indoc!(
r#"
when 1 is
0o9 -> 3
_ -> 4
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This octal integer pattern is malformed:
2│ 0o9 -> 3
^^^
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn malformed_bin_pattern() {
report_problem_as(
indoc!(
r#"
when 1 is
0b4 -> 3
_ -> 4
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This binary integer pattern is malformed:
2│ 0b4 -> 3
^^^
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn missing_fields() {
report_problem_as(
indoc!(
r#"
x : { a : Int *, b : Float *, c : Bool }
x = { b: 4.0 }
x
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `x` definition:
1│ x : { a : Int *, b : Float *, c : Bool }
2│ x = { b: 4.0 }
^^^^^^^^^^
The body is a record of type:
{ b : Float a }
But the type annotation on `x` says it should be:
{ a : Int *, b : Float *, c : Bool }
Tip: Looks like the c and a fields are missing.
"#
),
)
}
#[test]
fn bad_double_rigid() {
// this previously reported the message below, not sure which is better
//
// Something is off with the body of the `f` definition:
//
// 1│ f : a, b -> a
// 2│ f = \x, y -> if True then x else y
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
//
// The body is an anonymous function of type:
//
// a, a -> a
//
// But the type annotation on `f` says it should be:
//
// a, b -> a
report_problem_as(
indoc!(
r#"
f : a, b -> a
f = \x, y -> if True then x else y
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the `else` branch of this `if` expression:
1│ f : a, b -> a
2│ f = \x, y -> if True then x else y
^
This `y` value is a:
b
But the type annotation on `f` says it should be:
a
Tip: Your type annotation uses `b` and `a` as separate type variables.
Your code seems to be saying they are the same though. Maybe they
should be the same in your type annotation? Maybe your code uses them
in a weird way?
"#
),
)
}
#[test]
fn bad_rigid_function() {
report_problem_as(
indoc!(
r#"
f : Bool -> msg
f = \_ -> Foo
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : Bool -> msg
2│ f = \_ -> Foo
^^^
This `Foo` global tag has the type:
[ Foo ]a
But the type annotation on `f` says it should be:
msg
Tip: The type annotation uses the type variable `msg` to say that this
definition can produce any type of value. But in the body I see that
it will only produce a tag value of a single specific type. Maybe
change the type annotation to be more specific? Maybe change the code
to be more general?
"#
),
)
}
#[test]
fn bad_rigid_value() {
report_problem_as(
indoc!(
r#"
f : msg
f = 0x3
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : msg
2│ f = 0x3
^^^
The body is an integer of type:
Int a
But the type annotation on `f` says it should be:
msg
Tip: The type annotation uses the type variable `msg` to say that this
definition can produce any type of value. But in the body I see that
it will only produce a `Int` value of a single specific type. Maybe
change the type annotation to be more specific? Maybe change the code
to be more general?
"#
),
)
}
#[test]
fn typo_lowercase_ok() {
// TODO improve tag suggestions
report_problem_as(
indoc!(
r#"
f : Bool -> [ Ok I64, InvalidFoo ]
f = \_ -> ok 4
f
"#
),
indoc!(
r#"
── UNRECOGNIZED NAME ───────────────────────────────────────────────────────────
I cannot find a `ok` value
2│ f = \_ -> ok 4
^^
Did you mean one of these?
Ok
U8
Box
f
"#
),
)
}
#[test]
fn typo_uppercase_ok() {
// these error messages seem pretty helpful
report_problem_as(
indoc!(
r#"
f : Bool -> I64
f = \_ ->
ok = 3
Ok
f
"#
),
indoc!(
r#"
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`ok` is not used anywhere in your code.
3│ ok = 3
^^
If you didn't intend on using `ok` then remove it so future readers of
your code don't wonder why it is there.
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : Bool -> I64
2│ f = \_ ->
3│ ok = 3
4│
5│ Ok
^^
This `Ok` global tag has the type:
[ Ok ]a
But the type annotation on `f` says it should be:
I64
"#
),
)
}
#[test]
fn circular_definition_self() {
// invalid recursion
report_problem_as(
indoc!(
r#"
f = f
f
"#
),
indoc!(
r#"
── CIRCULAR DEFINITION ─────────────────────────────────────────────────────────
The `f` value is defined directly in terms of itself, causing an
infinite loop.
"#
),
)
}
#[test]
fn circular_definition() {
// invalid mutual recursion
report_problem_as(
indoc!(
r#"
foo = bar
bar = foo
foo
"#
),
indoc!(
r#"
── CIRCULAR DEFINITION ─────────────────────────────────────────────────────────
The `foo` definition is causing a very tricky infinite loop:
1│ foo = bar
^^^
The `foo` value depends on itself through the following chain of
definitions:
┌─────┐
│ foo
│ ↓
│ bar
└─────┘
"#
),
)
}
#[test]
fn update_empty_record() {
report_problem_as(
indoc!(
r#"
x = {}
{ x & foo: 3 }
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The `x` record does not have a `.foo` field:
3│ { x & foo: 3 }
^^^^^^
In fact, `x` is a record with NO fields!
"#
),
)
}
#[test]
fn update_record() {
report_problem_as(
indoc!(
r#"
x = { fo: 3, bar: 4 }
{ x & foo: 3 }
"#
),
// TODO also suggest fields with the correct type
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The `x` record does not have a `.foo` field:
3│ { x & foo: 3 }
^^^^^^
This is usually a typo. Here are the `x` fields that are most similar:
{ fo : Num b
, bar : Num a
}
So maybe `.foo` should be `.fo`?
"#
),
)
}
#[test]
fn update_record_ext() {
report_problem_as(
indoc!(
r#"
f : { fo: I64 }ext -> I64
f = \r ->
r2 = { r & foo: r.fo }
r2.fo
f
"#
),
// TODO also suggest fields with the correct type
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The `r` record does not have a `.foo` field:
3│ r2 = { r & foo: r.fo }
^^^^^^^^^
This is usually a typo. Here are the `r` fields that are most similar:
{ fo : I64
}ext
So maybe `.foo` should be `.fo`?
"#
),
)
}
#[test]
fn update_record_snippet() {
report_problem_as(
indoc!(
r#"
x = { fo: 3, bar: 4, baz: 3, spam: 42, foobar: 3 }
{ x & foo: 3 }
"#
),
// TODO also suggest fields with the correct type
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The `x` record does not have a `.foo` field:
3│ { x & foo: 3 }
^^^^^^
This is usually a typo. Here are the `x` fields that are most similar:
{ fo : Num c
, foobar : Num d
, bar : Num a
, baz : Num b
, ...
}
So maybe `.foo` should be `.fo`?
"#
),
)
}
#[test]
fn plus_on_str() {
report_problem_as(
indoc!(
r#"
0x4 + "foo"
"#
),
// TODO also suggest fields with the correct type
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `add` is not what I expect:
1│ 0x4 + "foo"
^^^^^
This argument is a string of type:
Str
But `add` needs the 2nd argument to be:
Num (Integer a)
"#
),
)
}
#[test]
fn int_float() {
report_problem_as(
indoc!(
r#"
0x4 + 3.14
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `add` is not what I expect:
1│ 0x4 + 3.14
^^^^
This argument is a float of type:
Float a
But `add` needs the 2nd argument to be:
Num (Integer a)
Tip: You can convert between Int and Float using functions like
`Num.toFloat` and `Num.round`.
"#
),
)
}
#[test]
fn boolean_tag() {
report_problem_as(
indoc!(
r#"
42 + True
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `add` is not what I expect:
1│ 42 + True
^^^^
This `True` boolean has the type:
[ True ]a
But `add` needs the 2nd argument to be:
Num a
"#
),
)
}
#[test]
fn tag_missing() {
report_problem_as(
indoc!(
r#"
f : [ A ] -> [ A, B ]
f = \a -> a
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : [ A ] -> [ A, B ]
2│ f = \a -> a
^
This `a` value is a:
[ A ]
But the type annotation on `f` says it should be:
[ A, B ]
Tip: Looks like a closed tag union does not have the `B` tag.
Tip: Closed tag unions can't grow, because that might change the size
in memory. Can you use an open tag union?
"#
),
)
}
#[test]
fn tags_missing() {
report_problem_as(
indoc!(
r#"
f : [ A ] -> [ A, B, C ]
f = \a -> a
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : [ A ] -> [ A, B, C ]
2│ f = \a -> a
^
This `a` value is a:
[ A ]
But the type annotation on `f` says it should be:
[ A, B, C ]
Tip: Looks like a closed tag union does not have the `C` and `B` tags.
Tip: Closed tag unions can't grow, because that might change the size
in memory. Can you use an open tag union?
"#
),
)
}
#[test]
fn patterns_fn_not_exhaustive() {
report_problem_as(
indoc!(
r#"
Either : [ Left I64, Right Bool ]
x : Either
x = Left 42
f : Either -> I64
f = \Left v -> v
f x
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This pattern does not cover all the possibilities:
7│ f = \Left v -> v
^^^^^^
Other possibilities include:
Right _
I would have to crash if I saw one of those! So rather than pattern
matching in function arguments, put a `when` in the function body to
account for all possibilities.
"#
),
)
}
#[test]
fn patterns_let_not_exhaustive() {
report_problem_as(
indoc!(
r#"
x : [ Left I64, Right Bool ]
x = Left 42
(Left y) = x
y
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This expression is used in an unexpected way:
5│ (Left y) = x
^
This `x` value is a:
[ Left I64, Right Bool ]
But you are trying to use it as:
[ Left a ]
Tip: Seems like a tag typo. Maybe `Right` should be `Left`?
Tip: Can more type annotations be added? Type annotations always help
me give more specific messages, and I think they could help a lot in
this case
"#
),
)
}
#[test]
fn patterns_when_not_exhaustive() {
report_problem_as(
indoc!(
r#"
when 0x1 is
2 -> 0x3
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
1│> when 0x1 is
2│> 2 -> 0x3
Other possibilities include:
_
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn patterns_bool_not_exhaustive() {
report_problem_as(
indoc!(
r#"
x : Bool
x = True
when x is
False -> 3
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
4│> when x is
5│> False -> 3
Other possibilities include:
True
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn patterns_enum_not_exhaustive() {
report_problem_as(
indoc!(
r#"
x : [ Red, Green, Blue ]
x = Red
when x is
Red -> 0
Green -> 1
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
4│> when x is
5│> Red -> 0
6│> Green -> 1
Other possibilities include:
Blue
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn patterns_remote_data_not_exhaustive() {
report_problem_as(
indoc!(
r#"
RemoteData e a : [ NotAsked, Loading, Failure e, Success a ]
x : RemoteData I64 Str
when x is
NotAsked -> 3
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
5│> when x is
6│> NotAsked -> 3
Other possibilities include:
Failure _
Loading
Success _
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn patterns_record_not_exhaustive() {
report_problem_as(
indoc!(
r#"
x = { a: 3 }
when x is
{ a: 4 } -> 4
"#
),
// Tip: Looks like a record field guard is not exhaustive. Learn more about record pattern matches at TODO.
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
3│> when x is
4│> { a: 4 } -> 4
Other possibilities include:
{ a }
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn patterns_record_guard_not_exhaustive() {
report_problem_as(
indoc!(
r#"
y : [ Nothing, Just I64 ]
y = Just 4
x = { a: y, b: 42}
when x is
{ a: Nothing } -> 4
{ a: Just 3 } -> 4
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
5│> when x is
6│> { a: Nothing } -> 4
7│> { a: Just 3 } -> 4
Other possibilities include:
{ a: Just _, b }
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn patterns_nested_tag_not_exhaustive() {
report_problem_as(
indoc!(
r#"
when Record Nothing 1 is
Record (Nothing) b -> b
Record (Just 3) b -> b
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
1│> when Record Nothing 1 is
2│> Record (Nothing) b -> b
3│> Record (Just 3) b -> b
Other possibilities include:
Record (Just _) _
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn patterns_int_redundant() {
report_problem_as(
indoc!(
r#"
when 0x1 is
2 -> 3
2 -> 4
_ -> 5
"#
),
indoc!(
r#"
── REDUNDANT PATTERN ───────────────────────────────────────────────────────────
The 2nd pattern is redundant:
1│ when 0x1 is
2│ 2 -> 3
3│> 2 -> 4
4│ _ -> 5
Any value of this shape will be handled by a previous pattern, so this
one should be removed.
"#
),
)
}
#[test]
fn unify_alias_other() {
report_problem_as(
indoc!(
r#"
Foo a : { x : Int a }
f : Foo a -> Int a
f = \r -> r.x
f { y: 3.14 }
"#
),
// de-aliases the alias to give a better error message
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `f` is not what I expect:
6│ f { y: 3.14 }
^^^^^^^^^^^
This argument is a record of type:
{ y : Float a }
But `f` needs the 1st argument to be:
{ x : Int a }
Tip: Seems like a record field typo. Maybe `y` should be `x`?
Tip: Can more type annotations be added? Type annotations always help
me give more specific messages, and I think they could help a lot in
this case
"#
),
)
}
#[test]
#[ignore]
fn cyclic_alias() {
report_problem_as(
indoc!(
r#"
Foo : { x : Bar }
Bar : { y : Foo }
f : Foo
f
"#
),
// should not report Bar as unused!
indoc!(
r#"
── CYCLIC ALIAS ────────────────────────────────────────────────────────────────
The `Foo` alias is recursive in an invalid way:
1│ Foo : { x : Bar }
^^^^^^^^^^^
The `Foo` alias depends on itself through the following chain of
definitions:
┌─────┐
│ Foo
│ ↓
│ Bar
└─────┘
Recursion in aliases is only allowed if recursion happens behind a
tag.
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
`Bar` is not used anywhere in your code.
2│ Bar : { y : Foo }
^^^^^^^^^^^^^^^^^
If you didn't intend on using `Bar` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn self_recursive_alias() {
report_problem_as(
indoc!(
r#"
Foo : { x : Foo }
f : Foo
f = 3
f
"#
),
// should not report Bar as unused!
indoc!(
r#"
── CYCLIC ALIAS ────────────────────────────────────────────────────────────────
The `Foo` alias is self-recursive in an invalid way:
1│ Foo : { x : Foo }
^^^
Recursion in aliases is only allowed if recursion happens behind a
tagged union, at least one variant of which is not recursive.
"#
),
)
}
#[test]
fn record_duplicate_field_same_type() {
report_problem_as(
indoc!(
r#"
{ x: 4, y: 3, x: 4 }
"#
),
indoc!(
r#"
── DUPLICATE FIELD NAME ────────────────────────────────────────────────────────
This record defines the `.x` field twice!
1│ { x: 4, y: 3, x: 4 }
^^^^ ^^^^
In the rest of the program, I will only use the latter definition:
1│ { x: 4, y: 3, x: 4 }
^^^^
For clarity, remove the previous `.x` definitions from this record.
"#
),
)
}
#[test]
fn record_duplicate_field_different_types() {
report_problem_as(
indoc!(
r#"
{ x: 4, y: 3, x: "foo" }
"#
),
indoc!(
r#"
── DUPLICATE FIELD NAME ────────────────────────────────────────────────────────
This record defines the `.x` field twice!
1│ { x: 4, y: 3, x: "foo" }
^^^^ ^^^^^^^^
In the rest of the program, I will only use the latter definition:
1│ { x: 4, y: 3, x: "foo" }
^^^^^^^^
For clarity, remove the previous `.x` definitions from this record.
"#
),
)
}
#[test]
fn record_duplicate_field_multiline() {
report_problem_as(
indoc!(
r#"
{
x: 4,
y: 3,
x: "foo"
}
"#
),
indoc!(
r#"
── DUPLICATE FIELD NAME ────────────────────────────────────────────────────────
This record defines the `.x` field twice!
1│ {
2│> x: 4,
3│ y: 3,
4│> x: "foo"
5│ }
In the rest of the program, I will only use the latter definition:
1│ {
2│ x: 4,
3│ y: 3,
4│> x: "foo"
5│ }
For clarity, remove the previous `.x` definitions from this record.
"#
),
)
}
#[test]
fn record_update_duplicate_field_multiline() {
report_problem_as(
indoc!(
r#"
\r ->
{ r &
x: 4,
y: 3,
x: "foo"
}
"#
),
indoc!(
r#"
── DUPLICATE FIELD NAME ────────────────────────────────────────────────────────
This record defines the `.x` field twice!
2│ { r &
3│> x: 4,
4│ y: 3,
5│> x: "foo"
6│ }
In the rest of the program, I will only use the latter definition:
2│ { r &
3│ x: 4,
4│ y: 3,
5│> x: "foo"
6│ }
For clarity, remove the previous `.x` definitions from this record.
"#
),
)
}
#[test]
fn record_type_duplicate_field() {
report_problem_as(
indoc!(
r#"
a : { foo : I64, bar : F64, foo : Str }
a = { bar: 3.0, foo: "foo" }
a
"#
),
indoc!(
r#"
── DUPLICATE FIELD NAME ────────────────────────────────────────────────────────
This record type defines the `.foo` field twice!
1│ a : { foo : I64, bar : F64, foo : Str }
^^^^^^^^^ ^^^^^^^^^
In the rest of the program, I will only use the latter definition:
1│ a : { foo : I64, bar : F64, foo : Str }
^^^^^^^^^
For clarity, remove the previous `.foo` definitions from this record
type.
"#
),
)
}
#[test]
fn tag_union_duplicate_tag() {
report_problem_as(
indoc!(
r#"
a : [ Foo I64, Bar F64, Foo Str ]
a = Foo "foo"
a
"#
),
indoc!(
r#"
── DUPLICATE TAG NAME ──────────────────────────────────────────────────────────
This tag union type defines the `Foo` tag twice!
1│ a : [ Foo I64, Bar F64, Foo Str ]
^^^^^^^ ^^^^^^^
In the rest of the program, I will only use the latter definition:
1│ a : [ Foo I64, Bar F64, Foo Str ]
^^^^^^^
For clarity, remove the previous `Foo` definitions from this tag union
type.
"#
),
)
}
#[test]
fn annotation_definition_mismatch() {
report_problem_as(
indoc!(
r#"
bar : I64
foo = \x -> x
# NOTE: neither bar or foo are defined at this point
4
"#
),
indoc!(
r#"
── NAMING PROBLEM ──────────────────────────────────────────────────────────────
This annotation does not match the definition immediately following
it:
1│> bar : I64
2│> foo = \x -> x
Is it a typo? If not, put either a newline or comment between them.
"#
),
)
}
#[test]
fn annotation_newline_body_is_fine() {
report_problem_as(
indoc!(
r#"
bar : I64
foo = \x -> x
foo bar
"#
),
indoc!(""),
)
}
#[test]
fn invalid_alias_rigid_var_pattern() {
report_problem_as(
indoc!(
r#"
MyAlias 1 : I64
4
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This pattern in the definition of `MyAlias` is not what I expect:
1│ MyAlias 1 : I64
^
Only type variables like `a` or `value` can occur in this position.
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`MyAlias` is not used anywhere in your code.
1│ MyAlias 1 : I64
^^^^^^^^^^^^^^^
If you didn't intend on using `MyAlias` then remove it so future readers
of your code don't wonder why it is there.
"#
),
)
}
#[test]
fn invalid_opaque_rigid_var_pattern() {
report_problem_as(
indoc!(
r#"
Age 1 := I64
a : Age
a
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This pattern in the definition of `Age` is not what I expect:
1│ Age 1 := I64
^
Only type variables like `a` or `value` can occur in this position.
"#
),
)
}
#[test]
fn invalid_num() {
report_problem_as(
indoc!(
r#"
a : Num I64 F64
a = 3
a
"#
),
indoc!(
r#"
── TOO MANY TYPE ARGUMENTS ─────────────────────────────────────────────────────
The `Num` alias expects 1 type argument, but it got 2 instead:
1│ a : Num I64 F64
^^^^^^^^^^^
Are there missing parentheses?
"#
),
)
}
#[test]
fn invalid_num_fn() {
report_problem_as(
indoc!(
r#"
f : Bool -> Num I64 F64
f = \_ -> 3
f
"#
),
indoc!(
r#"
── TOO MANY TYPE ARGUMENTS ─────────────────────────────────────────────────────
The `Num` alias expects 1 type argument, but it got 2 instead:
1│ f : Bool -> Num I64 F64
^^^^^^^^^^^
Are there missing parentheses?
"#
),
)
}
#[test]
fn too_few_type_arguments() {
report_problem_as(
indoc!(
r#"
Pair a b : [ Pair a b ]
x : Pair I64
x = Pair 2 3
x
"#
),
indoc!(
r#"
── TOO FEW TYPE ARGUMENTS ──────────────────────────────────────────────────────
The `Pair` alias expects 2 type arguments, but it got 1 instead:
3│ x : Pair I64
^^^^^^^^
Are there missing parentheses?
"#
),
)
}
#[test]
fn too_many_type_arguments() {
report_problem_as(
indoc!(
r#"
Pair a b : [ Pair a b ]
x : Pair I64 I64 I64
x = 3
x
"#
),
indoc!(
r#"
── TOO MANY TYPE ARGUMENTS ─────────────────────────────────────────────────────
The `Pair` alias expects 2 type arguments, but it got 3 instead:
3│ x : Pair I64 I64 I64
^^^^^^^^^^^^^^^^
Are there missing parentheses?
"#
),
)
}
#[test]
fn phantom_type_variable() {
report_problem_as(
indoc!(
r#"
Foo a : [ Foo ]
f : Foo I64
f
"#
),
indoc!(
r#"
── UNUSED TYPE ALIAS PARAMETER ─────────────────────────────────────────────────
The `a` type parameter is not used in the `Foo` alias definition:
1│ Foo a : [ Foo ]
^
Roc does not allow unused type alias parameters!
Tip: If you want an unused type parameter (a so-called "phantom
type"), read the guide section on phantom values.
"#
),
)
}
#[test]
fn elm_function_syntax() {
report_problem_as(
indoc!(
r#"
f x y = x
"#
),
indoc!(
r#"
── ARGUMENTS BEFORE EQUALS ─────────────────────────────────────────────────────
I am partway through parsing a definition, but I got stuck here:
1│ f x y = x
^^^
Looks like you are trying to define a function. In roc, functions are
always written as a lambda, like increment = \n -> n + 1.
"#
),
)
}
#[test]
fn two_different_cons() {
report_problem_as(
indoc!(
r#"
ConsList a : [ Cons a (ConsList a), Nil ]
x : ConsList {}
x = Cons {} (Cons "foo" Nil)
x
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `x` definition:
3│ x : ConsList {}
4│ x = Cons {} (Cons "foo" Nil)
^^^^^^^^^^^^^^^^^^^^^^^^
This `Cons` global tag application has the type:
[ Cons {} [ Cons Str [ Cons {} a, Nil ] as a, Nil ], Nil ]
But the type annotation on `x` says it should be:
[ Cons {} a, Nil ] as a
"#
),
)
}
#[test]
fn mutually_recursive_types_with_type_error() {
report_problem_as(
indoc!(
r#"
AList a b : [ ACons a (BList a b), ANil ]
BList a b : [ BCons a (AList a b), BNil ]
x : AList I64 I64
x = ACons 0 (BCons 1 (ACons "foo" BNil ))
y : BList a a
y = BNil
{ x, y }
"#
),
// TODO render tag unions across multiple lines
// TODO do not show recursion var if the recursion var does not render on the surface of a type
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `x` definition:
4│ x : AList I64 I64
5│ x = ACons 0 (BCons 1 (ACons "foo" BNil ))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This `ACons` global tag application has the type:
[ ACons (Num (Integer Signed64)) [
BCons (Num (Integer Signed64)) [ ACons Str [ BCons I64 a, BNil ],
ANil ], BNil ], ANil ]
But the type annotation on `x` says it should be:
[ ACons I64 (BList I64 I64), ANil ] as a
"#
),
)
}
#[test]
fn integer_out_of_range() {
report_problem_as(
indoc!(
r#"
x = 170_141_183_460_469_231_731_687_303_715_884_105_728_000
y = -170_141_183_460_469_231_731_687_303_715_884_105_728_000
h = 0xFFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF
l = -0xFFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF
minlit = -170_141_183_460_469_231_731_687_303_715_884_105_728
maxlit = 340_282_366_920_938_463_463_374_607_431_768_211_455
x + y + h + l + minlit + maxlit
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal is too big:
1│ x = 170_141_183_460_469_231_731_687_303_715_884_105_728_000
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The largest number representable in Roc is the maximum U128 value,
340_282_366_920_938_463_463_374_607_431_768_211_455.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal is too small:
3│ y = -170_141_183_460_469_231_731_687_303_715_884_105_728_000
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The smallest number representable in Roc is the minimum I128 value,
-170_141_183_460_469_231_731_687_303_715_884_105_728.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal is too big:
5│ h = 0xFFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The largest number representable in Roc is the maximum U128 value,
340_282_366_920_938_463_463_374_607_431_768_211_455.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal is too small:
6│ l = -0xFFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The smallest number representable in Roc is the minimum I128 value,
-170_141_183_460_469_231_731_687_303_715_884_105_728.
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn float_out_of_range() {
// have to deal with some whitespace issues because of the format! macro
report_problem_as(
indoc!(
r#"
overflow = 11.7976931348623157e308
underflow = -11.7976931348623157e308
overflow + underflow
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This float literal is too big:
1│ overflow = 11.7976931348623157e308
^^^^^^^^^^^^^^^^^^^^^^^
Roc uses signed 64-bit floating points, allowing values between
-1.7976931348623157e308 and 1.7976931348623157e308
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This float literal is too small:
2│ underflow = -11.7976931348623157e308
^^^^^^^^^^^^^^^^^^^^^^^^
Roc uses signed 64-bit floating points, allowing values between
-1.7976931348623157e308 and 1.7976931348623157e308
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn integer_malformed() {
// the generated messages here are incorrect. Waiting for a rust nightly feature to land,
// see https://github.com/rust-lang/rust/issues/22639
// this test is here to spot regressions in error reporting
report_problem_as(
indoc!(
r#"
dec = 100A
hex = 0xZZZ
oct = 0o9
bin = 0b2
dec + hex + oct + bin
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal contains an invalid digit:
1│ dec = 100A
^^^^
Integer literals can only contain the digits
0-9, or have an integer suffix.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This hex integer literal contains an invalid digit:
3│ hex = 0xZZZ
^^^^^
Hexadecimal (base-16) integer literals can only contain the digits
0-9, a-f and A-F, or have an integer suffix.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This octal integer literal contains an invalid digit:
5│ oct = 0o9
^^^
Octal (base-8) integer literals can only contain the digits
0-7, or have an integer suffix.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This binary integer literal contains an invalid digit:
7│ bin = 0b2
^^^
Binary (base-2) integer literals can only contain the digits
0 and 1, or have an integer suffix.
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn integer_empty() {
report_problem_as(
indoc!(
r#"
dec = 20
hex = 0x
oct = 0o
bin = 0b
dec + hex + oct + bin
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This hex integer literal contains no digits:
3│ hex = 0x
^^
Hexadecimal (base-16) integer literals must contain at least one of
the digits 0-9, a-f and A-F, or have an integer suffix.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This octal integer literal contains no digits:
5│ oct = 0o
^^
Octal (base-8) integer literals must contain at least one of the
digits 0-7, or have an integer suffix.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This binary integer literal contains no digits:
7│ bin = 0b
^^
Binary (base-2) integer literals must contain at least one of the
digits 0 and 1, or have an integer suffix.
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn float_malformed() {
report_problem_as(
indoc!(
r#"
x = 3.0A
x
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This float literal contains an invalid digit:
1│ x = 3.0A
^^^^
Floating point literals can only contain the digits 0-9, or use
scientific notation 10e4, or have a float suffix.
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn invalid_record_update() {
report_problem_as(
indoc!(
r#"
foo = { bar: 3 }
updateNestedRecord = { foo.bar & x: 4 }
example = { age: 42 }
# these should work
y = { Test.example & age: 3 }
x = { example & age: 4 }
{ updateNestedRecord, foo, x, y }
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This expression cannot be updated:
2│ updateNestedRecord = { foo.bar & x: 4 }
^^^^^^^
Only variables can be updated with record update syntax.
"#
),
)
}
#[test]
fn module_not_imported() {
report_problem_as(
indoc!(
r#"
Foo.test
"#
),
indoc!(
r#"
── MODULE NOT IMPORTED ─────────────────────────────────────────────────────────
The `Foo` module is not imported:
1│ Foo.test
^^^^^^^^
Is there an import missing? Perhaps there is a typo. Did you mean one
of these?
Box
Bool
Num
Set
"#
),
)
}
#[test]
fn optional_record_default_type_error() {
report_problem_as(
indoc!(
r#"
\{ x, y ? True } -> x + y
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `add` is not what I expect:
1│ \{ x, y ? True } -> x + y
^
This `y` value is a:
[ True ]a
But `add` needs the 2nd argument to be:
Num a
"#
),
)
}
#[test]
fn optional_record_default_with_signature() {
report_problem_as(
indoc!(
r#"
f : { x : I64, y ? I64 } -> I64
f = \{ x, y ? "foo" } -> (\g, _ -> g) x y
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `f` is weird:
2│ f = \{ x, y ? "foo" } -> (\g, _ -> g) x y
^^^^^^^^^^^^^^^^
The argument is a pattern that matches record values of type:
{ x : I64, y ? Str }
But the annotation on `f` says the 1st argument should be:
{ x : I64, y ? I64 }
"#
),
)
}
#[test]
fn optional_record_invalid_let_binding() {
report_problem_as(
indoc!(
r#"
\rec ->
{ x, y } : { x : I64, y ? Bool }
{ x, y } = rec
{ x, y }
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of this definition:
2│> { x, y } : { x : I64, y ? Bool }
3│> { x, y } = rec
The body is a value of type:
{ x : I64, y : Bool }
But the type annotation says it should be:
{ x : I64, y ? Bool }
Tip: To extract the `.y` field it must be non-optional, but the type
says this field is optional. Learn more about optional fields at TODO.
"#
),
)
}
#[test]
fn optional_record_invalid_function() {
report_problem_as(
indoc!(
r#"
f : { x : I64, y ? I64 } -> I64
f = \{ x, y } -> x + y
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `f` is weird:
2│ f = \{ x, y } -> x + y
^^^^^^^^
The argument is a pattern that matches record values of type:
{ x : I64, y : I64 }
But the annotation on `f` says the 1st argument should be:
{ x : I64, y ? I64 }
Tip: To extract the `.y` field it must be non-optional, but the type
says this field is optional. Learn more about optional fields at TODO.
"#
),
)
}
#[test]
fn optional_record_invalid_when() {
report_problem_as(
indoc!(
r#"
f : { x : I64, y ? I64 } -> I64
f = \r ->
when r is
{ x, y } -> x + y
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
4│ { x, y } -> x + y
^^^^^^^^
The first pattern is trying to match record values of type:
{ x : I64, y : I64 }
But the expression between `when` and `is` has the type:
{ x : I64, y ? I64 }
Tip: To extract the `.y` field it must be non-optional, but the type
says this field is optional. Learn more about optional fields at TODO.
"#
),
)
}
#[test]
fn optional_record_invalid_access() {
report_problem_as(
indoc!(
r#"
f : { x : I64, y ? I64 } -> I64
f = \r -> r.y
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This expression is used in an unexpected way:
2│ f = \r -> r.y
^^^
This `r` value is a:
{ x : I64, y ? I64 }
But you are trying to use it as:
{ x : I64, y : I64 }
Tip: To extract the `.y` field it must be non-optional, but the type
says this field is optional. Learn more about optional fields at TODO.
"#
),
)
}
#[test]
fn optional_record_invalid_accessor() {
report_problem_as(
indoc!(
r#"
f : { x : I64, y ? I64 } -> I64
f = \r -> .y r
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to this function is not what I expect:
2│ f = \r -> .y r
^
This `r` value is a:
{ x : I64, y ? I64 }
But this function needs the 1st argument to be:
{ x : I64, y : I64 }
Tip: To extract the `.y` field it must be non-optional, but the type
says this field is optional. Learn more about optional fields at TODO.
"#
),
)
}
#[test]
fn guard_mismatch_with_annotation() {
report_problem_as(
indoc!(
r#"
f : { x : I64, y : I64 } -> I64
f = \r ->
when r is
{ x, y : "foo" } -> x + 0
_ -> 0
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
4│ { x, y : "foo" } -> x + 0
^^^^^^^^^^^^^^^^
The first pattern is trying to match record values of type:
{ x : I64, y : Str }
But the expression between `when` and `is` has the type:
{ x : I64, y : I64 }
"#
),
)
}
#[test]
fn optional_field_mismatch_with_annotation() {
report_problem_as(
indoc!(
r#"
f : { x : I64, y ? I64 } -> I64
f = \r ->
when r is
{ x, y ? "foo" } -> (\g, _ -> g) x y
_ -> 0
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
4│ { x, y ? "foo" } -> (\g, _ -> g) x y
^^^^^^^^^^^^^^^^
The first pattern is trying to match record values of type:
{ x : I64, y ? Str }
But the expression between `when` and `is` has the type:
{ x : I64, y ? I64 }
"#
),
)
}
#[test]
fn incorrect_optional_field() {
report_problem_as(
indoc!(
r#"
{ x: 5, y ? 42 }
"#
),
indoc!(
r#"
── BAD OPTIONAL VALUE ──────────────────────────────────────────────────────────
This record uses an optional value for the `.y` field in an incorrect
context!
1│ { x: 5, y ? 42 }
^^^^^^
You can only use optional values in record destructuring, like:
{ answer ? 42, otherField } = myRecord
"#
),
)
}
#[test]
fn first_wildcard_is_required() {
report_problem_as(
indoc!(
r#"
when Foo 1 2 3 is
Foo _ 1 _ -> 1
_ -> 2
"#
),
"",
)
}
#[test]
fn second_wildcard_is_redundant() {
report_problem_as(
indoc!(
r#"
when Foo 1 2 3 is
Foo _ 1 _ -> 1
_ -> 2
_ -> 3
"#
),
indoc!(
r#"
── REDUNDANT PATTERN ───────────────────────────────────────────────────────────
The 3rd pattern is redundant:
1│ when Foo 1 2 3 is
2│ Foo _ 1 _ -> 1
3│ _ -> 2
4│ _ -> 3
^
Any value of this shape will be handled by a previous pattern, so this
one should be removed.
"#
),
)
}
#[test]
fn alias_using_alias() {
report_problem_as(
indoc!(
r#"
# The color of a node. Leaves are considered Black.
NodeColor : [ Red, Black ]
RBTree k v : [ Node NodeColor k v (RBTree k v) (RBTree k v), Empty ]
# Create an empty dictionary.
empty : RBTree k v
empty =
Empty
empty
"#
),
"",
)
}
#[test]
fn unused_argument() {
report_problem_as(
indoc!(
r#"
f = \foo -> 1
f
"#
),
indoc!(
r#"
── UNUSED ARGUMENT ─────────────────────────────────────────────────────────────
`f` doesn't use `foo`.
1│ f = \foo -> 1
^^^
If you don't need `foo`, then you can just remove it. However, if you
really do need `foo` as an argument of `f`, prefix it with an underscore,
like this: "_`foo`". Adding an underscore at the start of a variable
name is a way of saying that the variable is not used.
"#
),
)
}
#[test]
fn qualified_global_tag() {
report_problem_as(
indoc!(
r#"
Foo.Bar
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am trying to parse a qualified name here:
1│ Foo.Bar
^
This looks like a qualified tag name to me, but tags cannot be
qualified! Maybe you wanted a qualified name, something like
Json.Decode.string?
"#
),
)
}
#[test]
fn module_ident_ends_with_dot() {
report_problem_as(
indoc!(
r#"
Foo.Bar.
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am trying to parse a qualified name here:
1│ Foo.Bar.
^
I was expecting to see an identifier next, like height. A complete
qualified name looks something like Json.Decode.string.
"#
),
)
}
#[test]
fn record_access_ends_with_dot() {
report_problem_as(
indoc!(
r#"
foo.bar.
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I trying to parse a record field access here:
1│ foo.bar.
^
So I expect to see a lowercase letter next, like .name or .height.
"#
),
)
}
#[test]
fn qualified_private_tag() {
report_problem_as(
indoc!(
r#"
@Foo.Bar
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am very confused by this expression:
1│ @Foo.Bar
^^^^
Looks like a private tag is treated like a module name. Maybe you
wanted a qualified name, like Json.Decode.string?
"#
),
)
}
#[test]
fn type_annotation_double_colon() {
report_problem_as(
indoc!(
r#"
f :: I64
f = 42
f
"#
),
indoc!(
r#"
── UNKNOWN OPERATOR ────────────────────────────────────────────────────────────
This looks like an operator, but it's not one I recognize!
1│ f :: I64
^^
I have no specific suggestion for this operator, see TODO for the full
list of operators in Roc.
"#
),
)
}
#[test]
fn double_equals_in_def() {
// NOTE: VERY BAD ERROR MESSAGE
//
// looks like `x y` are considered argument to the add, even though they are
// on a lower indentation level
report_problem_as(
indoc!(
r#"
x = 3
y =
x == 5
Num.add 1 2
{ x, y }
"#
),
indoc!(
r#"
── TOO MANY ARGS ───────────────────────────────────────────────────────────────
This value is not a function, but it was given 3 arguments:
3│ x == 5
^
Are there any missing commas? Or missing parentheses?
"#
),
)
}
#[test]
fn tag_union_open() {
report_problem_as(
indoc!(
r#"
f : [
"#
),
indoc!(
r#"
── UNFINISHED TAG UNION TYPE ───────────────────────────────────────────────────
I just started parsing a tag union type, but I got stuck here:
1│ f : [
^
Tag unions look like [ Many I64, None ], so I was expecting to see a
tag name next.
"#
),
)
}
#[test]
fn tag_union_end() {
report_problem_as(
indoc!(
r#"
f : [ Yes,
"#
),
indoc!(
r#"
── UNFINISHED TAG UNION TYPE ───────────────────────────────────────────────────
I am partway through parsing a tag union type, but I got stuck here:
1│ f : [ Yes,
^
I was expecting to see a closing square bracket before this, so try
adding a ] and see if that helps?
"#
),
)
}
#[test]
fn tag_union_lowercase_tag_name() {
report_problem_as(
indoc!(
r#"
f : [ lowercase ]
"#
),
indoc!(
r#"
── WEIRD TAG NAME ──────────────────────────────────────────────────────────────
I am partway through parsing a tag union type, but I got stuck here:
1│ f : [ lowercase ]
^
I was expecting to see a tag name.
Hint: Tag names start with an uppercase letter, like Err or Green.
"#
),
)
}
#[test]
fn tag_union_second_lowercase_tag_name() {
report_problem_as(
indoc!(
r#"
f : [ Good, bad ]
"#
),
indoc!(
r#"
── WEIRD TAG NAME ──────────────────────────────────────────────────────────────
I am partway through parsing a tag union type, but I got stuck here:
1│ f : [ Good, bad ]
^
I was expecting to see a tag name.
Hint: Tag names start with an uppercase letter, like Err or Green.
"#
),
)
}
#[test]
fn record_type_open() {
report_problem_as(
indoc!(
r#"
f : {
"#
),
indoc!(
r#"
── UNFINISHED RECORD TYPE ──────────────────────────────────────────────────────
I just started parsing a record type, but I got stuck here:
1│ f : {
^
Record types look like { name : String, age : Int }, so I was
expecting to see a field name next.
"#
),
)
}
#[test]
fn record_type_open_indent() {
report_problem_as(
indoc!(
r#"
f : {
foo : I64,
"#
),
indoc!(
r#"
── UNFINISHED RECORD TYPE ──────────────────────────────────────────────────────
I am partway through parsing a record type, but I got stuck here:
1│ f : {
^
I was expecting to see a closing curly brace before this, so try
adding a } and see if that helps?
Note: I may be confused by indentation
"#
),
)
}
#[test]
fn record_type_end() {
report_problem_as(
indoc!(
r#"
f : { a: Int,
"#
),
indoc!(
r#"
── UNFINISHED RECORD TYPE ──────────────────────────────────────────────────────
I am partway through parsing a record type, but I got stuck here:
1│ f : { a: Int,
^
I was expecting to see a closing curly brace before this, so try
adding a } and see if that helps?
"#
),
)
}
#[test]
fn record_type_keyword_field_name() {
report_problem_as(
indoc!(
r#"
f : { if : I64 }
"#
),
indoc!(
r#"
── UNFINISHED RECORD TYPE ──────────────────────────────────────────────────────
I just started parsing a record type, but I got stuck on this field
name:
1│ f : { if : I64 }
^^
Looks like you are trying to use `if` as a field name, but that is a
reserved word. Try using a different name!
"#
),
)
}
#[test]
fn record_type_missing_comma() {
// a case where the message cannot be as good as elm's
report_problem_as(
indoc!(
r#"
f : { foo bar }
"#
),
indoc!(
r#"
── UNFINISHED RECORD TYPE ──────────────────────────────────────────────────────
I am partway through parsing a record type, but I got stuck here:
1│ f : { foo bar }
^
I was expecting to see a colon, question mark, comma or closing curly
brace.
"#
),
)
}
#[test]
fn record_type_tab() {
// a case where the message cannot be as good as elm's
report_problem_as(
"f : { foo \t }",
indoc!(
r#"
── TAB CHARACTER ───────────────────────────────────────────────────────────────
I encountered a tab character
1│ f : { foo }
^
Tab characters are not allowed.
"#
),
)
}
#[test]
fn comment_with_tab() {
report_problem_as(
"# comment with a \t\n4",
indoc!(
"
── TAB CHARACTER ───────────────────────────────────────────────────────────────
I encountered a tab character
1│ # comment with a \t
^
Tab characters are not allowed.
"
),
)
}
#[test]
fn type_in_parens_start() {
// TODO bad error message
report_problem_as(
indoc!(
r#"
f : (
"#
),
indoc!(
r#"
── UNFINISHED TYPE ─────────────────────────────────────────────────────────────
I just started parsing a type, but I got stuck here:
1│ f : (
^
I am expecting a type next, like Bool or List a.
"#
),
)
}
#[test]
fn type_in_parens_end() {
report_problem_as(
indoc!(
r#"
f : ( I64
"#
),
indoc!(
r#"
── UNFINISHED PARENTHESES ──────────────────────────────────────────────────────
I am partway through parsing a type in parentheses, but I got stuck
here:
1│ f : ( I64
^
I was expecting to see a parenthesis before this, so try adding a )
and see if that helps?
Note: I may be confused by indentation
"#
),
)
}
#[test]
fn type_apply_double_dot() {
report_problem_as(
indoc!(
r#"
f : Foo..Bar
f
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am confused by this type name:
1│ f : Foo..Bar
^^^^^^^^
Type names start with an uppercase letter, and can optionally be
qualified by a module name, like Bool or Http.Request.Request.
"#
),
)
// ── DOUBLE DOT ──────────────────────────────────────────────────────────────────
//
// I encountered two dots in a row:
//
// 1│ f : Foo..Bar
// ^
//
// Try removing one of them.
}
#[test]
fn type_apply_trailing_dot() {
report_problem_as(
indoc!(
r#"
f : Foo.Bar.
f
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am confused by this type name:
1│ f : Foo.Bar.
^^^^^^^^
Type names start with an uppercase letter, and can optionally be
qualified by a module name, like Bool or Http.Request.Request.
"#
),
)
// ── TRAILING DOT ────────────────────────────────────────────────────────────────
//
// I encountered a dot with nothing after it:
//
// 1│ f : Foo.Bar.
// ^
//
// Dots are used to refer to a type in a qualified way, like
// Num.I64 or List.List a. Try adding a type name next.
}
#[test]
fn type_apply_stray_dot() {
report_problem_as(
indoc!(
r#"
f : .
"#
),
indoc!(
r#"
── UNFINISHED TYPE ─────────────────────────────────────────────────────────────
I just started parsing a type, but I got stuck here:
1│ f : .
^
I am expecting a type next, like Bool or List a.
"#
),
)
}
#[test]
fn type_apply_start_with_number() {
report_problem_as(
indoc!(
r#"
f : Foo.1
f
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am confused by this type name:
1│ f : Foo.1
^^^^^
Type names start with an uppercase letter, and can optionally be
qualified by a module name, like Bool or Http.Request.Request.
"#
),
)
// ── WEIRD QUALIFIED NAME ────────────────────────────────────────────────────────
//
// I encountered a number at the start of a qualified name segment:
//
// 1│ f : Foo.1
// ^
//
// All parts of a qualified type name must start with an uppercase
// letter, like Num.I64 or List.List a.
}
#[test]
fn type_apply_start_with_lowercase() {
report_problem_as(
indoc!(
r#"
f : Foo.foo
f
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am confused by this type name:
1│ f : Foo.foo
^^^^^^^
Type names start with an uppercase letter, and can optionally be
qualified by a module name, like Bool or Http.Request.Request.
"#
),
)
}
#[test]
fn def_missing_final_expression() {
report_problem_as(
indoc!(
r#"
f : Foo.foo
"#
),
indoc!(
r#"
── MISSING FINAL EXPRESSION ────────────────────────────────────────────────────
I am partway through parsing a definition's final expression, but I
got stuck here:
1│ f : Foo.foo
^
This definition is missing a final expression. A nested definition
must be followed by either another definition, or an expression
x = 4
y = 2
x + y
"#
),
)
}
#[test]
fn type_inline_alias() {
report_problem_as(
indoc!(
r#"
f : I64 as
f = 0
f
"#
),
indoc!(
r#"
── UNFINISHED INLINE ALIAS ─────────────────────────────────────────────────────
I just started parsing an inline type alias, but I got stuck here:
1│ f : I64 as
^
Note: I may be confused by indentation
"#
),
)
}
#[test]
fn type_double_comma() {
report_problem_as(
indoc!(
r#"
f : I64,,I64 -> I64
f = 0
f
"#
),
indoc!(
r#"
── DOUBLE COMMA ────────────────────────────────────────────────────────────────
I just started parsing a function argument type, but I encountered two
commas in a row:
1│ f : I64,,I64 -> I64
^
Try removing one of them.
"#
),
)
}
#[test]
fn type_argument_no_arrow() {
report_problem_as(
indoc!(
r#"
f : I64, I64
f = 0
f
"#
),
indoc!(
r#"
── UNFINISHED TYPE ─────────────────────────────────────────────────────────────
I am partway through parsing a type, but I got stuck here:
1│ f : I64, I64
^
Note: I may be confused by indentation
"#
),
)
}
#[test]
fn type_argument_arrow_then_nothing() {
// TODO could do better by pointing out we're parsing a function type
report_problem_as(
indoc!(
r#"
f : I64, I64 ->
f = 0
f
"#
),
indoc!(
r#"
── UNFINISHED TYPE ─────────────────────────────────────────────────────────────
I just started parsing a type, but I got stuck here:
1│ f : I64, I64 ->
^
Note: I may be confused by indentation
"#
),
)
}
#[test]
fn invalid_private_tag_name() {
// TODO could do better by pointing out we're parsing a function type
report_problem_as(
indoc!(
r#"
f : [ @Foo Bool, @100 I64 ]
f = 0
f
"#
),
indoc!(
r#"
── WEIRD TAG NAME ──────────────────────────────────────────────────────────────
I am partway through parsing a tag union type, but I got stuck here:
1│ f : [ @Foo Bool, @100 I64 ]
^
I was expecting to see a private tag name.
Hint: Private tag names start with an `@` symbol followed by an
uppercase letter, like @UID or @SecretKey.
"#
),
)
}
#[test]
fn dict_type_formatting() {
// TODO could do better by pointing out we're parsing a function type
report_problem_as(
indoc!(
r#"
myDict : Dict I64 Str
myDict = Dict.insert Dict.empty "foo" 42
myDict
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `myDict` definition:
1│ myDict : Dict I64 Str
2│ myDict = Dict.insert Dict.empty "foo" 42
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This `insert` call produces:
Dict Str (Num a)
But the type annotation on `myDict` says it should be:
Dict I64 Str
"#
),
)
}
#[test]
fn alias_type_diff() {
report_problem_as(
indoc!(
r#"
HSet a : Set a
foo : Str -> HSet {}
myDict : HSet Str
myDict = foo "bar"
myDict
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `myDict` definition:
5│ myDict : HSet Str
6│ myDict = foo "bar"
^^^^^^^^^
This `foo` call produces:
HSet {}
But the type annotation on `myDict` says it should be:
HSet Str
"#
),
)
}
#[test]
fn if_guard_without_condition() {
// this should get better with time
report_problem_as(
indoc!(
r#"
when Just 4 is
Just if ->
4
_ ->
2
"#
),
indoc!(
r#"
── IF GUARD NO CONDITION ───────────────────────────────────────────────────────
I just started parsing an if guard, but there is no guard condition:
1│ when Just 4 is
2│ Just if ->
^
Try adding an expression before the arrow!
"#
),
)
}
#[test]
fn empty_or_pattern() {
report_problem_as(
indoc!(
r#"
when Just 4 is
Just 4 | ->
4
_ ->
2
"#
),
indoc!(
r#"
── UNFINISHED PATTERN ──────────────────────────────────────────────────────────
I just started parsing a pattern, but I got stuck here:
2│ Just 4 | ->
^
Note: I may be confused by indentation
"#
),
)
}
#[test]
fn pattern_binds_keyword() {
// TODO check if "what_is_next" is a keyword
report_problem_as(
indoc!(
r#"
when Just 4 is
Just when ->
4
_ ->
2
"#
),
indoc!(
r#"
── MISSING EXPRESSION ──────────────────────────────────────────────────────────
I am partway through parsing a definition, but I got stuck here:
1│ when Just 4 is
2│ Just when ->
^
I was expecting to see an expression like 42 or "hello".
"#
),
)
}
#[test]
fn when_missing_arrow() {
// this should get better with time
report_problem_as(
indoc!(
r#"
when 5 is
1 -> 2
_
"#
),
indoc!(
r#"
── MISSING ARROW ───────────────────────────────────────────────────────────────
I am partway through parsing a `when` expression, but got stuck here:
2│ 1 -> 2
3│ _
^
I was expecting to see an arrow next.
Note: Sometimes I get confused by indentation, so try to make your `when`
look something like this:
when List.first plants is
Ok n ->
n
Err _ ->
200
Notice the indentation. All patterns are aligned, and each branch is
indented a bit more than the corresponding pattern. That is important!
"#
),
)
}
#[test]
fn lambda_double_comma() {
report_problem_as(
indoc!(
r#"
\a,,b -> 1
"#
),
indoc!(
r#"
── UNFINISHED ARGUMENT LIST ────────────────────────────────────────────────────
I am partway through parsing a function argument list, but I got stuck
at this comma:
1│ \a,,b -> 1
^
I was expecting an argument pattern before this, so try adding an
argument before the comma and see if that helps?
"#
),
)
}
#[test]
fn lambda_leading_comma() {
report_problem_as(
indoc!(
r#"
\,b -> 1
"#
),
indoc!(
r#"
── UNFINISHED ARGUMENT LIST ────────────────────────────────────────────────────
I am partway through parsing a function argument list, but I got stuck
at this comma:
1│ \,b -> 1
^
I was expecting an argument pattern before this, so try adding an
argument before the comma and see if that helps?
"#
),
)
}
#[test]
fn when_outdented_branch() {
// this should get better with time
report_problem_as(
indoc!(
r#"
when 4 is
5 -> 2
2 -> 2
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I got stuck here:
1│ when 4 is
2│ 5 -> 2
^
Whatever I am running into is confusing me a lot! Normally I can give
fairly specific hints, but something is really tripping me up this
time.
"#
),
// TODO this formerly gave
//
// ── UNFINISHED WHEN ─────────────────────────────────────────────────────────────
//
// I was partway through parsing a `when` expression, but I got stuck here:
//
// 3│ _ -> 2
// ^
//
// I suspect this is a pattern that is not indented enough? (by 2 spaces)
//
// but that requires parsing the next pattern blindly, irrespective of indentation. Can
// we find an efficient solution that doesn't require parsing an extra pattern for
// every `when`, i.e. we want a good error message for the test case above, but for
// a valid `when`, we don't want to do extra work, e.g. here
//
// x
// when x is
// n -> n
//
// 4
//
// We don't want to parse the `4` and say it's an outdented pattern!
)
}
#[test]
fn when_over_indented_underscore() {
report_problem_as(
indoc!(
r#"
when 4 is
5 -> 2
_ -> 2
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I got stuck here:
1│ when 4 is
2│ 5 -> 2
^
Whatever I am running into is confusing me a lot! Normally I can give
fairly specific hints, but something is really tripping me up this
time.
"#
),
)
}
#[test]
fn when_over_indented_int() {
report_problem_as(
indoc!(
r#"
when 4 is
5 -> Num.neg
2 -> 2
"#
),
indoc!(
r#"
── UNEXPECTED ARROW ────────────────────────────────────────────────────────────
I am parsing a `when` expression right now, but this arrow is confusing
me:
3│ 2 -> 2
^^
It makes sense to see arrows around here, so I suspect it is something
earlier.Maybe this pattern is indented a bit farther from the previous
patterns?
Note: Here is an example of a valid `when` expression for reference.
when List.first plants is
Ok n ->
n
Err _ ->
200
Notice the indentation. All patterns are aligned, and each branch is
indented a bit more than the corresponding pattern. That is important!
"#
),
)
}
#[test]
fn if_outdented_then() {
// TODO I think we can do better here
report_problem_as(
indoc!(
r#"
x =
if 5 == 5
then 2 else 3
x
"#
),
indoc!(
r#"
── UNFINISHED IF ───────────────────────────────────────────────────────────────
I was partway through parsing an `if` expression, but I got stuck here:
2│ if 5 == 5
^
I was expecting to see the `then` keyword next.
"#
),
)
}
#[test]
fn if_missing_else() {
// this should get better with time
report_problem_as(
indoc!(
r#"
if 5 == 5 then 2
"#
),
indoc!(
r#"
── UNFINISHED IF ───────────────────────────────────────────────────────────────
I was partway through parsing an `if` expression, but I got stuck here:
1│ if 5 == 5 then 2
^
I was expecting to see the `else` keyword next.
"#
),
)
}
#[test]
fn list_double_comma() {
report_problem_as(
indoc!(
r#"
[ 1, 2, , 3 ]
"#
),
indoc!(
r#"
── UNFINISHED LIST ─────────────────────────────────────────────────────────────
I am partway through started parsing a list, but I got stuck here:
1│ [ 1, 2, , 3 ]
^
I was expecting to see a list entry before this comma, so try adding a
list entry and see if that helps?
"#
),
)
}
#[test]
fn list_without_end() {
report_problem_as(
indoc!(
r#"
[ 1, 2,
"#
),
indoc!(
r#"
── UNFINISHED LIST ─────────────────────────────────────────────────────────────
I am partway through started parsing a list, but I got stuck here:
1│ [ 1, 2,
^
I was expecting to see a closing square bracket before this, so try
adding a ] and see if that helps?
Note: When I get stuck like this, it usually means that there is a
missing parenthesis or bracket somewhere earlier. It could also be a
stray keyword or operator.
"#
),
)
}
#[test]
fn number_double_dot() {
report_problem_as(
indoc!(
r#"
1.1.1
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This float literal contains an invalid digit:
1│ 1.1.1
^^^^^
Floating point literals can only contain the digits 0-9, or use
scientific notation 10e4, or have a float suffix.
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn unicode_not_hex() {
report_problem_as(
r#""abc\u(zzzz)def""#,
indoc!(
r#"
── WEIRD CODE POINT ────────────────────────────────────────────────────────────
I am partway through parsing a unicode code point, but I got stuck
here:
1│ "abc\u(zzzz)def"
^
I was expecting a hexadecimal number, like \u(1100) or \u(00FF).
Learn more about working with unicode in roc at TODO
"#
),
)
}
#[test]
fn interpolate_not_identifier() {
report_problem_as(
r#""abc\(32)def""#,
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This string interpolation is invalid:
1│ "abc\(32)def"
^^
I was expecting an identifier, like \u(message) or
\u(LoremIpsum.text).
Learn more about string interpolation at TODO
"#
),
)
}
#[test]
fn unicode_too_large() {
report_problem_as(
r#""abc\u(110000)def""#,
indoc!(
r#"
── INVALID UNICODE ─────────────────────────────────────────────────────────────
This unicode code point is invalid:
1│ "abc\u(110000)def"
^^^^^^
Learn more about working with unicode in roc at TODO
"#
),
)
}
#[test]
fn weird_escape() {
report_problem_as(
r#""abc\qdef""#,
indoc!(
r#"
── WEIRD ESCAPE ────────────────────────────────────────────────────────────────
I was partway through parsing a string literal, but I got stuck here:
1│ "abc\qdef"
^^
This is not an escape sequence I recognize. After a backslash, I am
looking for one of these:
- A newline: \n
- A caret return: \r
- A tab: \t
- An escaped quote: \"
- An escaped backslash: \\
- A unicode code point: \u(00FF)
- An interpolated string: \(myVariable)
"#
),
)
}
#[test]
fn single_no_end() {
report_problem_as(
r#""there is no end"#,
indoc!(
r#"
── ENDLESS STRING ──────────────────────────────────────────────────────────────
I cannot find the end of this string:
1│ "there is no end
^
You could change it to something like "to be or not to be" or even
just "".
"#
),
)
}
#[test]
fn multi_no_end() {
report_problem_as(
r#""""there is no end"#,
indoc!(
r#"
── ENDLESS STRING ──────────────────────────────────────────────────────────────
I cannot find the end of this block string:
1│ """there is no end
^
You could change it to something like """to be or not to be""" or even
just """""".
"#
),
)
}
#[test]
// https://github.com/rtfeldman/roc/issues/1714
fn interpolate_concat_is_transparent_1714() {
report_problem_as(
indoc!(
r#"
greeting = "Privet"
if True then 1 else "\(greeting), World!"
"#,
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This `if` has an `else` branch with a different type from its `then` branch:
3│ if True then 1 else "\(greeting), World!"
^^^^^^^^^^^^^^^^^^^^^
The `else` branch is a string of type:
Str
but the `then` branch has the type:
Num a
I need all branches in an `if` to have the same type!
"#
),
)
}
macro_rules! comparison_binop_transparency_tests {
($($op:expr, $name:ident),* $(,)?) => {
$(
#[test]
fn $name() {
report_problem_as(
&format!(r#"if True then "abc" else 1 {} 2"#, $op),
&format!(
r#"── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This `if` has an `else` branch with a different type from its `then` branch:
1│ if True then "abc" else 1 {} 2
^^{}^^
This comparison produces:
Bool
but the `then` branch has the type:
Str
I need all branches in an `if` to have the same type!
"#,
$op, "^".repeat($op.len())
),
)
}
)*
}
}
comparison_binop_transparency_tests! {
"<", lt_binop_is_transparent,
">", gt_binop_is_transparent,
"==", eq_binop_is_transparent,
"!=", neq_binop_is_transparent,
"<=", leq_binop_is_transparent,
">=", geq_binop_is_transparent,
}
#[test]
fn keyword_record_field_access() {
report_problem_as(
indoc!(
r#"
foo = {}
foo.if
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This expression is used in an unexpected way:
3│ foo.if
^^^^^^
This `foo` value is a:
{}
But you are trying to use it as:
{ if : a }b
"#
),
)
}
#[test]
fn keyword_qualified_import() {
report_problem_as(
indoc!(
r#"
Num.if
"#
),
indoc!(
r#"
── NOT EXPOSED ─────────────────────────────────────────────────────────────────
The Num module does not expose `if`:
1│ Num.if
^^^^^^
Did you mean one of these?
Num.sin
Num.div
Num.abs
Num.neg
"#
),
)
}
#[test]
fn stray_dot_expr() {
report_problem_as(
indoc!(
r#"
Num.add . 23
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I trying to parse a record field access here:
1│ Num.add . 23
^
So I expect to see a lowercase letter next, like .name or .height.
"#
),
)
}
#[test]
fn private_tag_not_uppercase() {
report_problem_as(
indoc!(
r#"
Num.add @foo 23
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am trying to parse a private tag here:
1│ Num.add @foo 23
^
But after the `@` symbol I found a lowercase letter. All tag names
(global and private) must start with an uppercase letter, like @UUID
or @Secrets.
"#
),
)
}
#[test]
fn private_tag_field_access() {
report_problem_as(
indoc!(
r#"
@UUID.bar
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am very confused by this field access:
1│ @UUID.bar
^^^^
It looks like a record field access on a private tag.
"#
),
)
}
#[test]
fn opaque_ref_field_access() {
report_problem_as(
indoc!(
r#"
$UUID.bar
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am very confused by this field access:
1│ $UUID.bar
^^^^
It looks like a record field access on an opaque reference.
"#
),
)
}
#[test]
fn weird_accessor() {
report_problem_as(
indoc!(
r#"
.foo.bar
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am very confused by this field access
1│ .foo.bar
^^^^^^^^
It looks like a field access on an accessor. I parse.client.name as
(.client).name. Maybe use an anonymous function like
(\r -> r.client.name) instead?
"#
),
)
}
#[test]
fn part_starts_with_number() {
report_problem_as(
indoc!(
r#"
foo.100
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I trying to parse a record field access here:
1│ foo.100
^
So I expect to see a lowercase letter next, like .name or .height.
"#
),
)
}
#[test]
fn closure_underscore_ident() {
report_problem_as(
indoc!(
r#"
\the_answer -> 100
"#
),
indoc!(
r#"
── NAMING PROBLEM ──────────────────────────────────────────────────────────────
I am trying to parse an identifier here:
1│ \the_answer -> 100
^
Underscores are not allowed in identifiers. Use camelCase instead!
"#
),
)
}
#[test]
#[ignore]
fn double_binop() {
report_problem_as(
indoc!(
r#"
key >= 97 && <= 122
"#
),
indoc!(
r#"
"#
),
)
}
#[test]
#[ignore]
fn case_of() {
report_problem_as(
indoc!(
r#"
case 1 of
1 -> True
_ -> False
"#
),
indoc!(
r#"
"#
),
)
}
#[test]
fn argument_without_space() {
report_problem_as(
indoc!(
r#"
[ "foo", bar("") ]
"#
),
indoc!(
r#"
── UNRECOGNIZED NAME ───────────────────────────────────────────────────────────
I cannot find a `bar` value
1│ [ "foo", bar("") ]
^^^
Did you mean one of these?
Nat
Str
Err
U8
"#
),
)
}
#[test]
fn invalid_operator() {
report_problem_as(
indoc!(
r#"
main =
5 ** 3
"#
),
indoc!(
r#"
── UNKNOWN OPERATOR ────────────────────────────────────────────────────────────
This looks like an operator, but it's not one I recognize!
1│ main =
2│ 5 ** 3
^^
I have no specific suggestion for this operator, see TODO for the full
list of operators in Roc.
"#
),
)
}
#[test]
fn double_plus() {
report_problem_as(
indoc!(
r#"
main =
[] ++ []
"#
),
indoc!(
r#"
── UNKNOWN OPERATOR ────────────────────────────────────────────────────────────
This looks like an operator, but it's not one I recognize!
1│ main =
2│ [] ++ []
^^
To concatenate two lists or strings, try using List.concat or
Str.concat instead.
"#
),
)
}
#[test]
fn inline_hastype() {
report_problem_as(
indoc!(
r#"
main =
(\x -> x) : I64
3
"#
),
indoc!(
r#"
── UNKNOWN OPERATOR ────────────────────────────────────────────────────────────
This looks like an operator, but it's not one I recognize!
1│ main =
2│ (\x -> x) : I64
^
The has-type operator : can only occur in a definition's type
signature, like
increment : I64 -> I64
increment = \x -> x + 1
"#
),
)
}
#[test]
fn wild_case_arrow() {
// this is still bad, but changing the order and progress of other parsers should improve it
// down the line
report_problem_as(
indoc!(
r#"
main = 5 -> 3
"#
),
indoc!(
r#"
── UNKNOWN OPERATOR ────────────────────────────────────────────────────────────
This looks like an operator, but it's not one I recognize!
1│ main = 5 -> 3
^^
The arrow -> is only used to define cases in a `when`.
when color is
Red -> "stop!"
Green -> "go!"
"#
),
)
}
#[test]
fn provides_to_identifier() {
report_header_problem_as(
indoc!(
r#"
app "test-base64"
packages { pf: "platform" }
imports [pf.Task, Base64 ]
provides [ main, @Foo ] to pf
"#
),
indoc!(
r#"
── WEIRD PROVIDES ──────────────────────────────────────────────────────────────
I am partway through parsing a provides list, but I got stuck here:
3│ imports [pf.Task, Base64 ]
4│ provides [ main, @Foo ] to pf
^
I was expecting a type name, value name or function name next, like
provides [ Animal, default, tame ]
"#
),
)
}
#[test]
fn platform_requires_rigids() {
report_header_problem_as(
indoc!(
r#"
platform "folkertdev/foo"
requires { main : Effect {} }
exposes []
packages {}
imports [Task]
provides [ mainForHost ]
effects fx.Effect
{
putChar : I64 -> Effect {},
putLine : Str -> Effect {},
getLine : Effect Str
}
"#
),
indoc!(
r#"
── BAD REQUIRES ────────────────────────────────────────────────────────────────
I am partway through parsing a header, but I got stuck here:
1│ platform "folkertdev/foo"
2│ requires { main : Effect {} }
^
I am expecting a list of type names like `{}` or `{ Model }` next. A full
`requires` definition looks like
requires { Model, Msg } {main : Effect {}}
"#
),
)
}
#[test]
fn missing_imports() {
report_header_problem_as(
indoc!(
r#"
interface Foobar
exposes [ main, Foo ]
"#
),
indoc!(
r#"
── WEIRD IMPORTS ───────────────────────────────────────────────────────────────
I am partway through parsing a header, but I got stuck here:
2│ exposes [ main, Foo ]
^
I am expecting the `imports` keyword next, like
imports [ Animal, default, tame ]
"#
),
)
}
#[test]
fn exposes_identifier() {
report_header_problem_as(
indoc!(
r#"
interface Foobar
exposes [ main, @Foo ]
imports [pf.Task, Base64 ]
"#
),
indoc!(
r#"
── WEIRD EXPOSES ───────────────────────────────────────────────────────────────
I am partway through parsing an `exposes` list, but I got stuck here:
1│ interface Foobar
2│ exposes [ main, @Foo ]
^
I was expecting a type name, value name or function name next, like
exposes [ Animal, default, tame ]
"#
),
)
}
#[test]
fn invalid_module_name() {
report_header_problem_as(
indoc!(
r#"
interface foobar
exposes [ main, @Foo ]
imports [pf.Task, Base64 ]
"#
),
indoc!(
r#"
── WEIRD MODULE NAME ───────────────────────────────────────────────────────────
I am partway through parsing a header, but got stuck here:
1│ interface foobar
^
I am expecting a module name next, like BigNum or Main. Module names
must start with an uppercase letter.
"#
),
)
}
#[test]
fn invalid_app_name() {
report_header_problem_as(
indoc!(
r#"
app foobar
exposes [ main, @Foo ]
imports [pf.Task, Base64 ]
"#
),
indoc!(
r#"
── WEIRD APP NAME ──────────────────────────────────────────────────────────────
I am partway through parsing a header, but got stuck here:
1│ app foobar
^
I am expecting an application name next, like app "main" or
app "editor". App names are surrounded by quotation marks.
"#
),
)
}
#[test]
fn apply_unary_negative() {
report_problem_as(
indoc!(
r#"
foo = 3
-foo 1 2
"#
),
indoc!(
r#"
── TOO MANY ARGS ───────────────────────────────────────────────────────────────
This value is not a function, but it was given 2 arguments:
3│ -foo 1 2
^^^^
Are there any missing commas? Or missing parentheses?
"#
),
)
}
#[test]
fn apply_unary_not() {
report_problem_as(
indoc!(
r#"
foo = True
!foo 1 2
"#
),
indoc!(
r#"
── TOO MANY ARGS ───────────────────────────────────────────────────────────────
This value is not a function, but it was given 2 arguments:
3│ !foo 1 2
^^^^
Are there any missing commas? Or missing parentheses?
"#
),
)
}
#[test]
fn applied_tag_function() {
report_problem_as(
indoc!(
r#"
x : List [ Foo Str ]
x = List.map [ 1, 2 ] Foo
x
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `x` definition:
1│ x : List [ Foo Str ]
2│ x = List.map [ 1, 2 ] Foo
^^^^^^^^^^^^^^^^^^^^^
This `map` call produces:
List [ Foo Num a ]
But the type annotation on `x` says it should be:
List [ Foo Str ]
"#
),
)
}
#[test]
fn pattern_in_parens_open() {
report_problem_as(
indoc!(
r#"
\( a
"#
),
indoc!(
r#"
── UNFINISHED PARENTHESES ──────────────────────────────────────────────────────
I am partway through parsing a pattern in parentheses, but I got stuck
here:
1│ \( a
^
I was expecting to see a closing parenthesis before this, so try
adding a ) and see if that helps?
"#
),
)
}
#[test]
fn pattern_in_parens_end_comma() {
report_problem_as(
indoc!(
r#"
\( a,
"#
),
indoc!(
r#"
── UNFINISHED PARENTHESES ──────────────────────────────────────────────────────
I am partway through parsing a pattern in parentheses, but I got stuck
here:
1│ \( a,
^
I was expecting to see a closing parenthesis before this, so try
adding a ) and see if that helps?
"#
),
)
}
#[test]
fn pattern_in_parens_end() {
report_problem_as(
indoc!(
r#"
\( a
"#
),
indoc!(
r#"
── UNFINISHED PARENTHESES ──────────────────────────────────────────────────────
I am partway through parsing a pattern in parentheses, but I got stuck
here:
1│ \( a
^
I was expecting to see a closing parenthesis before this, so try
adding a ) and see if that helps?
"#
),
)
}
#[test]
fn pattern_in_parens_indent_end() {
report_problem_as(
indoc!(
r#"
x = \( a
)
"#
),
indoc!(
r#"
── NEED MORE INDENTATION ───────────────────────────────────────────────────────
I am partway through parsing a pattern in parentheses, but I got stuck
here:
1│ x = \( a
2│ )
^
I need this parenthesis to be indented more. Try adding more spaces
before it!
"#
),
)
}
#[test]
fn pattern_in_parens_indent_open() {
report_problem_as(
indoc!(
r#"
\(
"#
),
indoc!(
r#"
── UNFINISHED PATTERN ──────────────────────────────────────────────────────────
I just started parsing a pattern, but I got stuck here:
1│ \(
^
Note: I may be confused by indentation
"#
),
)
}
#[test]
fn outdented_in_parens() {
report_problem_as(
indoc!(
r#"
Box : (
Str
)
4
"#
),
indoc!(
r#"
── NEED MORE INDENTATION ───────────────────────────────────────────────────────
I am partway through parsing a type in parentheses, but I got stuck
here:
1│ Box : (
2│ Str
3│ )
^
I need this parenthesis to be indented more. Try adding more spaces
before it!
"#
),
)
}
#[test]
fn backpassing_type_error() {
report_problem_as(
indoc!(
r#"
x <- List.map [ "a", "b" ]
x + 1
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `map` is not what I expect:
1│> x <- List.map [ "a", "b" ]
2│>
3│> x + 1
This argument is an anonymous function of type:
Num a -> Num a
But `map` needs the 2nd argument to be:
Str -> Num a
"#
),
)
}
#[test]
fn underscore_let() {
report_problem_as(
indoc!(
r#"
_ = 3
4
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
Underscore patterns are not allowed in definitions
1│ _ = 3
^
"#
),
)
}
#[test]
fn expect_expr_type_error() {
report_problem_as(
indoc!(
r#"
expect "foobar"
4
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This `expect` condition needs to be a Bool:
1│ expect "foobar"
^^^^^^^^
Right now it’s a string of type:
Str
But I need every `expect` condition to evaluate to a Bool—either `True`
or `False`.
"#
),
)
}
#[test]
fn num_too_general_wildcard() {
report_problem_as(
indoc!(
r#"
mult : Num *, F64 -> F64
mult = \a, b -> a * b
mult 0 0
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `mul` is not what I expect:
2│ mult = \a, b -> a * b
^
This `b` value is a:
F64
But `mul` needs the 2nd argument to be:
Num *
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `mult` definition:
1│ mult : Num *, F64 -> F64
2│ mult = \a, b -> a * b
^^^^^
This `mul` call produces:
Num *
But the type annotation on `mult` says it should be:
F64
"#
),
)
}
#[test]
fn num_too_general_named() {
report_problem_as(
indoc!(
r#"
mult : Num a, F64 -> F64
mult = \a, b -> a * b
mult 0 0
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `mul` is not what I expect:
2│ mult = \a, b -> a * b
^
This `b` value is a:
F64
But `mul` needs the 2nd argument to be:
Num a
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `mult` definition:
1│ mult : Num a, F64 -> F64
2│ mult = \a, b -> a * b
^^^^^
This `mul` call produces:
Num a
But the type annotation on `mult` says it should be:
F64
"#
),
)
}
#[test]
fn inference_var_not_enough_in_alias() {
report_problem_as(
indoc!(
r#"
canIGo : _ -> Result _
canIGo = \color ->
when color is
"green" -> Ok "go!"
"yellow" -> Err (SlowIt "whoa, let's slow down!")
"red" -> Err (StopIt "absolutely not")
_ -> Err (UnknownColor "this is a weird stoplight")
canIGo
"#
),
indoc!(
r#"
── TOO FEW TYPE ARGUMENTS ──────────────────────────────────────────────────────
The `Result` alias expects 2 type arguments, but it got 1 instead:
1│ canIGo : _ -> Result _
^^^^^^^^
Are there missing parentheses?
"#
),
)
}
#[test]
fn inference_var_too_many_in_alias() {
report_problem_as(
indoc!(
r#"
canIGo : _ -> Result _ _ _
canIGo = \color ->
when color is
"green" -> Ok "go!"
"yellow" -> Err (SlowIt "whoa, let's slow down!")
"red" -> Err (StopIt "absolutely not")
_ -> Err (UnknownColor "this is a weird stoplight")
canIGo
"#
),
indoc!(
r#"
── TOO MANY TYPE ARGUMENTS ─────────────────────────────────────────────────────
The `Result` alias expects 2 type arguments, but it got 3 instead:
1│ canIGo : _ -> Result _ _ _
^^^^^^^^^^^^
Are there missing parentheses?
"#
),
)
}
#[test]
fn inference_var_conflict_in_rigid_links() {
report_problem_as(
indoc!(
r#"
f : a -> (_ -> b)
f = \x -> \y -> if x == y then x else y
f
"#
),
// TODO: We should tell the user that we inferred `_` as `a`
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : a -> (_ -> b)
2│ f = \x -> \y -> if x == y then x else y
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The body is an anonymous function of type:
a -> a
But the type annotation on `f` says it should be:
a -> b
Tip: Your type annotation uses `a` and `b` as separate type variables.
Your code seems to be saying they are the same though. Maybe they
should be the same in your type annotation? Maybe your code uses them
in a weird way?
"#
),
)
}
#[test]
fn error_wildcards_are_related() {
report_problem_as(
indoc!(
r#"
f : * -> *
f = \x -> x
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : * -> *
2│ f = \x -> x
^
The type annotation on `f` says this `x` value should have the type:
*
However, the type of this `x` value is connected to another type in a
way that isn't reflected in this annotation.
Tip: Any connection between types must use a named type variable, not
a `*`! Maybe the annotation on `f` should have a named type variable in
place of the `*`?
"#
),
)
}
#[test]
fn error_nested_wildcards_are_related() {
report_problem_as(
indoc!(
r#"
f : a, b, * -> {x: a, y: b, z: *}
f = \x, y, z -> {x, y, z}
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : a, b, * -> {x: a, y: b, z: *}
2│ f = \x, y, z -> {x, y, z}
^^^^^^^^^
The type annotation on `f` says the body is a record should have the
type:
{ x : a, y : b, z : * }
However, the type of the body is a record is connected to another type
in a way that isn't reflected in this annotation.
Tip: Any connection between types must use a named type variable, not
a `*`! Maybe the annotation on `f` should have a named type variable in
place of the `*`?
"#
),
)
}
#[test]
fn error_wildcards_are_related_in_nested_defs() {
report_problem_as(
indoc!(
r#"
f : a, b, * -> *
f = \_, _, x2 ->
inner : * -> *
inner = \y -> y
inner x2
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `f` definition:
1│ f : a, b, * -> *
2│ f = \_, _, x2 ->
3│ inner : * -> *
4│ inner = \y -> y
5│ inner x2
^^^^^^^^
The type annotation on `f` says this `inner` call should have the type:
*
However, the type of this `inner` call is connected to another type in a
way that isn't reflected in this annotation.
Tip: Any connection between types must use a named type variable, not
a `*`! Maybe the annotation on `f` should have a named type variable in
place of the `*`?
"#
),
)
}
#[test]
fn error_inline_alias_not_an_alias() {
report_problem_as(
indoc!(
r#"
f : List elem -> [ Nil, Cons elem a ] as a
"#
),
indoc!(
r#"
── NOT AN INLINE ALIAS ─────────────────────────────────────────────────────────
The inline type after this `as` is not a type alias:
1│ f : List elem -> [ Nil, Cons elem a ] as a
^
Inline alias types must start with an uppercase identifier and be
followed by zero or more type arguments, like Point or List a.
"#
),
)
}
#[test]
fn error_inline_alias_qualified() {
report_problem_as(
indoc!(
r#"
f : List elem -> [ Nil, Cons elem a ] as Module.LinkedList a
"#
),
indoc!(
r#"
── QUALIFIED ALIAS NAME ────────────────────────────────────────────────────────
This type alias has a qualified name:
1│ f : List elem -> [ Nil, Cons elem a ] as Module.LinkedList a
^
An alias introduces a new name to the current scope, so it must be
unqualified.
"#
),
)
}
#[test]
fn error_inline_alias_argument_uppercase() {
report_problem_as(
indoc!(
r#"
f : List elem -> [ Nil, Cons elem a ] as LinkedList U
"#
),
indoc!(
r#"
── TYPE ARGUMENT NOT LOWERCASE ─────────────────────────────────────────────────
This alias type argument is not lowercase:
1│ f : List elem -> [ Nil, Cons elem a ] as LinkedList U
^
All type arguments must be lowercase.
"#
),
)
}
#[test]
fn mismatched_single_tag_arg() {
report_problem_as(
indoc!(
r#"
isEmpty =
\email ->
Email str = email
Str.isEmpty str
isEmpty (Name "boo")
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `isEmpty` is not what I expect:
6│ isEmpty (Name "boo")
^^^^^^^^^^
This `Name` global tag application has the type:
[ Name Str ]a
But `isEmpty` needs the 1st argument to be:
[ Email Str ]
Tip: Seems like a tag typo. Maybe `Name` should be `Email`?
Tip: Can more type annotations be added? Type annotations always help
me give more specific messages, and I think they could help a lot in
this case
"#
),
)
}
#[test]
fn issue_2326() {
report_problem_as(
indoc!(
r#"
C a b : a -> D a b
D a b : { a, b }
f : C a Nat -> D a Nat
f = \c -> c 6
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `c` is not what I expect:
5│ f = \c -> c 6
^
This argument is a number of type:
Num a
But `c` needs the 1st argument to be:
a
Tip: The type annotation uses the type variable `a` to say that this
definition can produce any type of value. But in the body I see that
it will only produce a `Num` value of a single specific type. Maybe
change the type annotation to be more specific? Maybe change the code
to be more general?
"#
),
)
}
#[test]
fn issue_2380_annotations_only() {
report_problem_as(
indoc!(
r#"
F : F
a : F
a
"#
),
indoc!(
r#"
── CYCLIC ALIAS ────────────────────────────────────────────────────────────────
The `F` alias is self-recursive in an invalid way:
1│ F : F
^
Recursion in aliases is only allowed if recursion happens behind a
tagged union, at least one variant of which is not recursive.
"#
),
)
}
#[test]
fn issue_2380_typed_body() {
report_problem_as(
indoc!(
r#"
F : F
a : F
a = 1
a
"#
),
indoc!(
r#"
── CYCLIC ALIAS ────────────────────────────────────────────────────────────────
The `F` alias is self-recursive in an invalid way:
1│ F : F
^
Recursion in aliases is only allowed if recursion happens behind a
tagged union, at least one variant of which is not recursive.
"#
),
)
}
#[test]
fn issue_2380_alias_with_vars() {
report_problem_as(
indoc!(
r#"
F a b : F a b
a : F Str Str
a
"#
),
indoc!(
r#"
── CYCLIC ALIAS ────────────────────────────────────────────────────────────────
The `F` alias is self-recursive in an invalid way:
1│ F a b : F a b
^
Recursion in aliases is only allowed if recursion happens behind a
tagged union, at least one variant of which is not recursive.
"#
),
)
}
#[test]
fn issue_2167_record_field_optional_and_required_mismatch() {
report_problem_as(
indoc!(
r#"
Job : [ @Job { inputs : List Str } ]
job : { inputs ? List Str } -> Job
job = \{ inputs } ->
@Job { inputs }
job { inputs: [ "build", "test" ] }
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `job` is weird:
3│ job = \{ inputs } ->
^^^^^^^^^^
The argument is a pattern that matches record values of type:
{ inputs : List Str }
But the annotation on `job` says the 1st argument should be:
{ inputs ? List Str }
Tip: To extract the `.inputs` field it must be non-optional, but the
type says this field is optional. Learn more about optional fields at
TODO.
"#
),
)
}
#[test]
fn unify_recursive_with_nonrecursive() {
report_problem_as(
indoc!(
r#"
Job : [ @Job { inputs : List Job } ]
job : { inputs : List Str } -> Job
job = \{ inputs } ->
@Job { inputs }
job { inputs: [ "build", "test" ] }
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `job` definition:
3│ job : { inputs : List Str } -> Job
4│ job = \{ inputs } ->
5│ @Job { inputs }
^^^^^^^^^^^^^^^
This `@Job` private tag application has the type:
[ @Job { inputs : List Str } ]
But the type annotation on `job` says it should be:
[ @Job { inputs : List a } ] as a
"#
),
)
}
#[test]
fn nested_datatype() {
report_problem_as(
indoc!(
r#"
Nested a : [ Chain a (Nested (List a)), Term ]
s : Nested Str
s
"#
),
indoc!(
r#"
── NESTED DATATYPE ─────────────────────────────────────────────────────────────
`Nested` is a nested datatype. Here is one recursive usage of it:
1│ Nested a : [ Chain a (Nested (List a)), Term ]
^^^^^^^^^^^^^^^
But recursive usages of `Nested` must match its definition:
1│ Nested a : [ Chain a (Nested (List a)), Term ]
^^^^^^^^
Nested datatypes are not supported in Roc.
Hint: Consider rewriting the definition of `Nested` to use the recursive type with the same arguments.
"#
),
)
}
#[test]
fn nested_datatype_inline() {
report_problem_as(
indoc!(
r#"
f : {} -> [ Chain a (Nested (List a)), Term ] as Nested a
f
"#
),
indoc!(
r#"
── NESTED DATATYPE ─────────────────────────────────────────────────────────────
`Nested` is a nested datatype. Here is one recursive usage of it:
1│ f : {} -> [ Chain a (Nested (List a)), Term ] as Nested a
^^^^^^^^^^^^^^^
But recursive usages of `Nested` must match its definition:
1│ f : {} -> [ Chain a (Nested (List a)), Term ] as Nested a
^^^^^^^^
Nested datatypes are not supported in Roc.
Hint: Consider rewriting the definition of `Nested` to use the recursive type with the same arguments.
"#
),
)
}
macro_rules! mismatched_suffix_tests {
($($number:expr, $suffix:expr, $name:ident)*) => {$(
#[test]
fn $name() {
let number = $number.to_string();
let mut typ = $suffix.to_string();
typ.get_mut(0..1).unwrap().make_ascii_uppercase();
let bad_type = if $suffix == "u8" { "I8" } else { "U8" };
let carets = "^".repeat(number.len() + $suffix.len());
let kind = match $suffix {
"dec"|"f32"|"f64" => "a float",
_ => "an integer",
};
report_problem_as(
&format!(indoc!(
r#"
use : {} -> U8
use {}{}
"#
), bad_type, number, $suffix),
&format!(indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `use` is not what I expect:
2│ use {}{}
{}
This argument is {} of type:
{}
But `use` needs the 1st argument to be:
{}
"#
), number, $suffix, carets, kind, typ, bad_type),
)
}
)*}
}
mismatched_suffix_tests! {
1, "u8", mismatched_suffix_u8
1, "u16", mismatched_suffix_u16
1, "u32", mismatched_suffix_u32
1, "u64", mismatched_suffix_u64
1, "u128", mismatched_suffix_u128
1, "i8", mismatched_suffix_i8
1, "i16", mismatched_suffix_i16
1, "i32", mismatched_suffix_i32
1, "i64", mismatched_suffix_i64
1, "i128", mismatched_suffix_i128
1, "nat", mismatched_suffix_nat
1, "dec", mismatched_suffix_dec
1, "f32", mismatched_suffix_f32
1, "f64", mismatched_suffix_f64
}
macro_rules! mismatched_suffix_tests_in_pattern {
($($number:expr, $suffix:expr, $name:ident)*) => {$(
#[test]
fn $name() {
let number = $number.to_string();
let mut typ = $suffix.to_string();
typ.get_mut(0..1).unwrap().make_ascii_uppercase();
let bad_suffix = if $suffix == "u8" { "i8" } else { "u8" };
let bad_type = if $suffix == "u8" { "I8" } else { "U8" };
let carets = "^".repeat(number.len() + $suffix.len());
let kind = match $suffix {
"dec"|"f32"|"f64" => "floats",
_ => "integers",
};
report_problem_as(
&format!(indoc!(
r#"
when {}{} is
{}{} -> 1
_ -> 1
"#
), number, bad_suffix, number, $suffix),
&format!(indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
2│ {}{} -> 1
{}
The first pattern is trying to match {}:
{}
But the expression between `when` and `is` has the type:
{}
"#
), number, $suffix, carets, kind, typ, bad_type),
)
}
)*}
}
mismatched_suffix_tests_in_pattern! {
1, "u8", mismatched_suffix_u8_pattern
1, "u16", mismatched_suffix_u16_pattern
1, "u32", mismatched_suffix_u32_pattern
1, "u64", mismatched_suffix_u64_pattern
1, "u128", mismatched_suffix_u128_pattern
1, "i8", mismatched_suffix_i8_pattern
1, "i16", mismatched_suffix_i16_pattern
1, "i32", mismatched_suffix_i32_pattern
1, "i64", mismatched_suffix_i64_pattern
1, "i128", mismatched_suffix_i128_pattern
1, "nat", mismatched_suffix_nat_pattern
1, "dec", mismatched_suffix_dec_pattern
1, "f32", mismatched_suffix_f32_pattern
1, "f64", mismatched_suffix_f64_pattern
}
#[test]
fn bad_numeric_literal_suffix() {
report_problem_as(
indoc!(
r#"
1u256
"#
),
// TODO: link to number suffixes
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal contains an invalid digit:
1│ 1u256
^^^^^
Integer literals can only contain the digits
0-9, or have an integer suffix.
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn numer_literal_multi_suffix() {
report_problem_as(
indoc!(
r#"
1u8u8
"#
),
// TODO: link to number suffixes
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal contains an invalid digit:
1│ 1u8u8
^^^^^
Integer literals can only contain the digits
0-9, or have an integer suffix.
Tip: Learn more about number literals at TODO
"#
),
)
}
#[test]
fn int_literal_has_float_suffix() {
report_problem_as(
indoc!(
r#"
0b1f32
"#
),
indoc!(
r#"
── CONFLICTING NUMBER SUFFIX ───────────────────────────────────────────────────
This number literal is an integer, but it has a float suffix:
1│ 0b1f32
^^^^^^
"#
),
)
}
#[test]
fn float_literal_has_int_suffix() {
report_problem_as(
indoc!(
r#"
1.0u8
"#
),
indoc!(
r#"
── CONFLICTING NUMBER SUFFIX ───────────────────────────────────────────────────
This number literal is a float, but it has an integer suffix:
1│ 1.0u8
^^^^^
"#
),
)
}
#[test]
fn u8_overflow() {
report_problem_as(
"256u8",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 256u8
^^^^^
Tip: The suffix indicates this integer is a U8, whose maximum value is
255.
"#
),
)
}
#[test]
fn negative_u8() {
report_problem_as(
"-1u8",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -1u8
^^^^
Tip: The suffix indicates this integer is a U8, whose minimum value is
0.
"#
),
)
}
#[test]
fn u16_overflow() {
report_problem_as(
"65536u16",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 65536u16
^^^^^^^^
Tip: The suffix indicates this integer is a U16, whose maximum value
is 65535.
"#
),
)
}
#[test]
fn negative_u16() {
report_problem_as(
"-1u16",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -1u16
^^^^^
Tip: The suffix indicates this integer is a U16, whose minimum value
is 0.
"#
),
)
}
#[test]
fn u32_overflow() {
report_problem_as(
"4_294_967_296u32",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 4_294_967_296u32
^^^^^^^^^^^^^^^^
Tip: The suffix indicates this integer is a U32, whose maximum value
is 4_294_967_295.
"#
),
)
}
#[test]
fn negative_u32() {
report_problem_as(
"-1u32",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -1u32
^^^^^
Tip: The suffix indicates this integer is a U32, whose minimum value
is 0.
"#
),
)
}
#[test]
fn u64_overflow() {
report_problem_as(
"18_446_744_073_709_551_616u64",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 18_446_744_073_709_551_616u64
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Tip: The suffix indicates this integer is a U64, whose maximum value
is 18_446_744_073_709_551_615.
"#
),
)
}
#[test]
fn negative_u64() {
report_problem_as(
"-1u64",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -1u64
^^^^^
Tip: The suffix indicates this integer is a U64, whose minimum value
is 0.
"#
),
)
}
#[test]
fn negative_u128() {
report_problem_as(
"-1u128",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -1u128
^^^^^^
Tip: The suffix indicates this integer is a U128, whose minimum value
is 0.
"#
),
)
}
#[test]
fn i8_overflow() {
report_problem_as(
"128i8",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 128i8
^^^^^
Tip: The suffix indicates this integer is a I8, whose maximum value is
127.
"#
),
)
}
#[test]
fn i8_underflow() {
report_problem_as(
"-129i8",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -129i8
^^^^^^
Tip: The suffix indicates this integer is a I8, whose minimum value is
-128.
"#
),
)
}
#[test]
fn i16_overflow() {
report_problem_as(
"32768i16",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 32768i16
^^^^^^^^
Tip: The suffix indicates this integer is a I16, whose maximum value
is 32767.
"#
),
)
}
#[test]
fn i16_underflow() {
report_problem_as(
"-32769i16",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -32769i16
^^^^^^^^^
Tip: The suffix indicates this integer is a I16, whose minimum value
is -32768.
"#
),
)
}
#[test]
fn i32_overflow() {
report_problem_as(
"2_147_483_648i32",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 2_147_483_648i32
^^^^^^^^^^^^^^^^
Tip: The suffix indicates this integer is a I32, whose maximum value
is 2_147_483_647.
"#
),
)
}
#[test]
fn i32_underflow() {
report_problem_as(
"-2_147_483_649i32",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -2_147_483_649i32
^^^^^^^^^^^^^^^^^
Tip: The suffix indicates this integer is a I32, whose minimum value
is -2_147_483_648.
"#
),
)
}
#[test]
fn i64_overflow() {
report_problem_as(
"9_223_372_036_854_775_808i64",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 9_223_372_036_854_775_808i64
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Tip: The suffix indicates this integer is a I64, whose maximum value
is 9_223_372_036_854_775_807.
"#
),
)
}
#[test]
fn i64_underflow() {
report_problem_as(
"-9_223_372_036_854_775_809i64",
indoc!(
r#"
── NUMBER UNDERFLOWS SUFFIX ────────────────────────────────────────────────────
This integer literal underflows the type indicated by its suffix:
1│ -9_223_372_036_854_775_809i64
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Tip: The suffix indicates this integer is a I64, whose minimum value
is -9_223_372_036_854_775_808.
"#
),
)
}
#[test]
fn i128_overflow() {
report_problem_as(
"170_141_183_460_469_231_731_687_303_715_884_105_728i128",
indoc!(
r#"
── NUMBER OVERFLOWS SUFFIX ─────────────────────────────────────────────────────
This integer literal overflows the type indicated by its suffix:
1│ 170_141_183_460_469_231_731_687_303_715_884_105_728i128
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Tip: The suffix indicates this integer is a I128, whose maximum value
is 170_141_183_460_469_231_731_687_303_715_884_105_727.
"#
),
)
}
#[test]
fn list_get_negative_number() {
report_problem_as(
indoc!(
r#"
List.get [1,2,3] -1
"#
),
// TODO: this error message could be improved, e.g. something like "This argument can
// be used as ... because of its literal value"
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `get` is not what I expect:
1│ List.get [1,2,3] -1
^^
This argument is a number of type:
I8, I16, I32, I64, I128, F32, F64, or Dec
But `get` needs the 2nd argument to be:
Nat
"#
),
)
}
#[test]
fn list_get_negative_number_indirect() {
report_problem_as(
indoc!(
r#"
a = -9_223_372_036_854
List.get [1,2,3] a
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `get` is not what I expect:
2│ List.get [1,2,3] a
^
This `a` value is a:
I64, I128, F32, F64, or Dec
But `get` needs the 2nd argument to be:
Nat
"#
),
)
}
#[test]
fn list_get_negative_number_double_indirect() {
report_problem_as(
indoc!(
r#"
a = -9_223_372_036_854
b = a
List.get [1,2,3] b
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd argument to `get` is not what I expect:
3│ List.get [1,2,3] b
^
This `b` value is a:
I64, I128, F32, F64, or Dec
But `get` needs the 2nd argument to be:
Nat
"#
),
)
}
#[test]
fn compare_unsigned_to_signed() {
report_problem_as(
indoc!(
r#"
when -1 is
1u8 -> 1
_ -> 1
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st pattern in this `when` is causing a mismatch:
2│ 1u8 -> 1
^^^
The first pattern is trying to match integers:
U8
But the expression between `when` and `is` has the type:
I8, I16, I32, I64, I128, F32, F64, or Dec
"#
),
)
}
#[test]
fn recursive_type_alias_is_newtype() {
report_problem_as(
indoc!(
r#"
R a : [ Only (R a) ]
v : R U8
v
"#
),
indoc!(
r#"
── CYCLIC ALIAS ────────────────────────────────────────────────────────────────
The `R` alias is self-recursive in an invalid way:
1│ R a : [ Only (R a) ]
^
Recursion in aliases is only allowed if recursion happens behind a
tagged union, at least one variant of which is not recursive.
"#
),
)
}
#[test]
fn recursive_type_alias_is_newtype_deep() {
report_problem_as(
indoc!(
r#"
R a : [ Only { very: [ Deep (R a) ] } ]
v : R U8
v
"#
),
indoc!(
r#"
── CYCLIC ALIAS ────────────────────────────────────────────────────────────────
The `R` alias is self-recursive in an invalid way:
1│ R a : [ Only { very: [ Deep (R a) ] } ]
^
Recursion in aliases is only allowed if recursion happens behind a
tagged union, at least one variant of which is not recursive.
"#
),
)
}
#[test]
fn recursive_type_alias_is_newtype_mutual() {
report_problem_as(
indoc!(
r#"
Foo a : [ Thing (Bar a) ]
Bar a : [ Stuff (Foo a) ]
v : Bar U8
v
"#
),
indoc!(
r#"
── CYCLIC ALIAS ────────────────────────────────────────────────────────────────
The `Foo` alias is recursive in an invalid way:
1│ Foo a : [ Thing (Bar a) ]
^^^
The `Foo` alias depends on itself through the following chain of
definitions:
┌─────┐
│ Foo
│ ↓
│ Bar
└─────┘
Recursion in aliases is only allowed if recursion happens behind a
tagged union, at least one variant of which is not recursive.
"#
),
)
}
#[test]
fn issue_2458() {
report_problem_as(
indoc!(
r#"
Foo a : [ Blah (Result (Bar a) []) ]
Bar a : Foo a
v : Bar U8
v
"#
),
"",
)
}
#[test]
fn opaque_type_not_in_scope() {
report_problem_as(
indoc!(
r#"
$Age 21
"#
),
indoc!(
r#"
── OPAQUE TYPE NOT DEFINED ─────────────────────────────────────────────────────
The opaque type Age referenced here is not defined:
1│ $Age 21
^^^^
Note: It looks like there are no opaque types declared in this scope yet!
"#
),
)
}
#[test]
fn opaque_reference_not_opaque_type() {
report_problem_as(
indoc!(
r#"
Age : U8
$Age 21
"#
),
indoc!(
r#"
── OPAQUE TYPE NOT DEFINED ─────────────────────────────────────────────────────
The opaque type Age referenced here is not defined:
3│ $Age 21
^^^^
Note: There is an alias of the same name:
1│ Age : U8
^^^
Note: It looks like there are no opaque types declared in this scope yet!
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`Age` is not used anywhere in your code.
1│ Age : U8
^^^^^^^^
If you didn't intend on using `Age` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn qualified_opaque_reference() {
report_problem_as(
indoc!(
r#"
OtherModule.$Age 21
"#
),
// TODO: get rid of the first error. Consider parsing OtherModule.$Age to completion
// and checking it during can. The reason the error appears is because it is parsed as
// Apply(Error(OtherModule), [ $Age, 21 ])
indoc!(
r#"
── OPAQUE TYPE NOT APPLIED ─────────────────────────────────────────────────────
This opaque type is not applied to an argument:
1│ OtherModule.$Age 21
^^^^
Note: Opaque types always wrap exactly one argument!
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I am trying to parse a qualified name here:
1│ OtherModule.$Age 21
^
I was expecting to see an identifier next, like height. A complete
qualified name looks something like Json.Decode.string.
"#
),
)
}
#[test]
fn opaque_used_outside_declaration_scope() {
report_problem_as(
indoc!(
r#"
age =
Age := U8
21u8
$Age age
"#
),
// TODO(opaques): there is a potential for a better error message here, if the usage of
// `$Age` can be linked to the declaration of `Age` inside `age`, and a suggestion to
// raise that declaration to the outer scope.
indoc!(
r#"
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`Age` is not used anywhere in your code.
2│ Age := U8
^^^^^^^^^
If you didn't intend on using `Age` then remove it so future readers of
your code don't wonder why it is there.
── OPAQUE TYPE NOT DEFINED ─────────────────────────────────────────────────────
The opaque type Age referenced here is not defined:
5│ $Age age
^^^^
Note: It looks like there are no opaque types declared in this scope yet!
"#
),
)
}
#[test]
fn unimported_modules_reported() {
report_problem_as(
indoc!(
r#"
main : Task.Task {} []
main = "whatever man you don't even know my type"
main
"#
),
indoc!(
r#"
── MODULE NOT IMPORTED ─────────────────────────────────────────────────────────
The `Task` module is not imported:
1│ main : Task.Task {} []
^^^^^^^^^^^^^^^
Is there an import missing? Perhaps there is a typo. Did you mean one
of these?
Test
List
Num
Box
"#
),
)
}
#[test]
fn opaque_mismatch_check() {
report_problem_as(
indoc!(
r#"
Age := U8
n : Age
n = $Age ""
n
"#
),
// TODO(opaques): error could be improved by saying that the opaque definition demands
// that the argument be a U8, and linking to the definitin!
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This expression is used in an unexpected way:
4│ n = $Age ""
^^
This argument to an opaque type has type:
Str
But you are trying to use it as:
U8
"#
),
)
}
#[test]
fn opaque_mismatch_infer() {
report_problem_as(
indoc!(
r#"
F n := n
if True
then $F ""
else $F {}
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This expression is used in an unexpected way:
5│ else $F {}
^^
This argument to an opaque type has type:
{}
But you are trying to use it as:
Str
"#
),
)
}
#[test]
fn opaque_creation_is_not_wrapped() {
report_problem_as(
indoc!(
r#"
F n := n
v : F Str
v = ""
v
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with the body of the `v` definition:
3│ v : F Str
4│ v = ""
^^
The body is a string of type:
Str
But the type annotation on `v` says it should be:
F Str
Tip: Type comparisons between an opaque type are only ever equal if
both types are the same opaque type. Did you mean to create an opaque
type by wrapping it? If I have an opaque type Age := U32 I can create
an instance of this opaque type by doing @Age 23.
"#
),
)
}
#[test]
fn opaque_mismatch_pattern_check() {
report_problem_as(
indoc!(
r#"
Age := U8
f : Age -> U8
f = \Age n -> n
f
"#
),
// TODO(opaques): error could be improved by saying that the user-provided pattern
// probably wants to change "Age" to "@Age"!
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This pattern is being used in an unexpected way:
4│ f = \Age n -> n
^^^^^
It is a `Age` tag of type:
[ Age a ]
But it needs to match:
Age
Tip: Type comparisons between an opaque type are only ever equal if
both types are the same opaque type. Did you mean to create an opaque
type by wrapping it? If I have an opaque type Age := U32 I can create
an instance of this opaque type by doing @Age 23.
"#
),
)
}
#[test]
fn opaque_mismatch_pattern_infer() {
report_problem_as(
indoc!(
r#"
F n := n
\x ->
when x is
$F A -> ""
$F {} -> ""
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 2nd pattern in this `when` does not match the previous ones:
6│ $F {} -> ""
^^^^^
The 2nd pattern is trying to matchF unwrappings of type:
F {}a
But all the previous branches match:
F [ A ]a
"#
),
)
}
#[test]
fn opaque_pattern_match_not_exhaustive_tag() {
report_problem_as(
indoc!(
r#"
F n := n
v : F [ A, B, C ]
when v is
$F A -> ""
$F B -> ""
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
5│> when v is
6│> $F A -> ""
7│> $F B -> ""
Other possibilities include:
$F C
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn opaque_pattern_match_not_exhaustive_int() {
report_problem_as(
indoc!(
r#"
F n := n
v : F U8
when v is
$F 1 -> ""
$F 2 -> ""
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
5│> when v is
6│> $F 1 -> ""
7│> $F 2 -> ""
Other possibilities include:
$F _
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn let_polymorphism_with_scoped_type_variables() {
report_problem_as(
indoc!(
r#"
f : a -> a
f = \x ->
y : a -> a
y = \z -> z
n = y 1u8
x1 = y x
(\_ -> x1) n
f
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
The 1st argument to `y` is not what I expect:
6│ n = y 1u8
^^^
This argument is an integer of type:
U8
But `y` needs the 1st argument to be:
a
Tip: The type annotation uses the type variable `a` to say that this
definition can produce any type of value. But in the body I see that
it will only produce a `U8` value of a single specific type. Maybe
change the type annotation to be more specific? Maybe change the code
to be more general?
"#
),
)
}
#[test]
fn non_exhaustive_with_guard() {
report_problem_as(
indoc!(
r#"
x : [A]
when x is
A if True -> ""
"#
),
indoc!(
r#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This `when` does not cover all the possibilities:
2│> when x is
3│> A if True -> ""
Other possibilities include:
A (note the lack of an if clause)
I would have to crash if I saw one of those! Add branches for them!
"#
),
)
}
#[test]
fn invalid_record_extension_type() {
report_problem_as(
indoc!(
r#"
f : { x : Nat }U32
f
"#
),
indoc!(
r#"
── INVALID_EXTENSION_TYPE ──────────────────────────────────────────────────────
This record extension type is invalid:
1│ f : { x : Nat }U32
^^^
Note: A record extension variable can only contain a type variable or
another record.
"#
),
)
}
#[test]
fn invalid_tag_extension_type() {
report_problem_as(
indoc!(
r#"
f : [ A ]Str
f
"#
),
indoc!(
r#"
── INVALID_EXTENSION_TYPE ──────────────────────────────────────────────────────
This tag union extension type is invalid:
1│ f : [ A ]Str
^^^
Note: A tag union extension variable can only contain a type variable
or another tag union.
"#
),
)
}
#[test]
fn unknown_type() {
report_problem_as(
indoc!(
r#"
Type : [ Constructor UnknownType ]
insertHelper : UnknownType, Type -> Type
insertHelper = \h, m ->
when m is
Constructor _ -> Constructor h
insertHelper
"#
),
indoc!(
r#"
── UNRECOGNIZED NAME ───────────────────────────────────────────────────────────
I cannot find a `UnknownType` value
1│ Type : [ Constructor UnknownType ]
^^^^^^^^^^^
Did you mean one of these?
Type
Unsigned8
Unsigned32
Unsigned16
── UNRECOGNIZED NAME ───────────────────────────────────────────────────────────
I cannot find a `UnknownType` value
3│ insertHelper : UnknownType, Type -> Type
^^^^
Did you mean one of these?
Type
Unsigned8
Unsigned32
Unsigned16
"#
),
)
}
#[test]
fn ability_first_demand_not_indented_enough() {
report_problem_as(
indoc!(
r#"
Eq has
eq : a, a -> U64 | a has Eq
1
"#
),
indoc!(
r#"
── UNFINISHED ABILITY ──────────────────────────────────────────────────────────
I was partway through parsing an ability definition, but I got stuck
here:
1│ Eq has
2│ eq : a, a -> U64 | a has Eq
^
I suspect this line is not indented enough (by 1 spaces)
"#
),
)
}
#[test]
fn ability_demands_not_indented_with_first() {
new_report_problem_as(
indoc!(
r#"
Eq has
eq : a, a -> U64 | a has Eq
neq : a, a -> U64 | a has Eq
1
"#
),
indoc!(
r#"
── UNFINISHED ABILITY ──────────────────────────────────────────────────────────
I was partway through parsing an ability definition, but I got stuck
here:
5│ eq : a, a -> U64 | a has Eq
6│ neq : a, a -> U64 | a has Eq
^
I suspect this line is indented too much (by 4 spaces)"#
),
)
}
#[test]
fn ability_demand_value_has_args() {
new_report_problem_as(
indoc!(
r#"
Eq has
eq b c : a, a -> U64 | a has Eq
1
"#
),
indoc!(
r#"
── UNFINISHED ABILITY ──────────────────────────────────────────────────────────
I was partway through parsing an ability definition, but I got stuck
here:
5│ eq b c : a, a -> U64 | a has Eq
^
I was expecting to see a : annotating the signature of this value
next."#
),
)
}
#[test]
fn ability_non_signature_expression() {
report_problem_as(
indoc!(
r#"
Eq has
123
1
"#
),
indoc!(
r#"
── UNFINISHED ABILITY ──────────────────────────────────────────────────────────
I was partway through parsing an ability definition, but I got stuck
here:
1│ Eq has
2│ 123
^
I was expecting to see a value signature next.
"#
),
)
}
#[test]
fn wildcard_in_alias() {
report_problem_as(
indoc!(
r#"
I : Int *
a : I
a
"#
),
indoc!(
r#"
── UNBOUND TYPE VARIABLE ───────────────────────────────────────────────────────
The definition of `I` has an unbound type variable:
1│ I : Int *
^
Tip: Type variables must be bound before the `:`. Perhaps you intended
to add a type parameter to this type?
"#
),
)
}
#[test]
fn wildcard_in_opaque() {
report_problem_as(
indoc!(
r#"
I := Int *
a : I
a
"#
),
indoc!(
r#"
── UNBOUND TYPE VARIABLE ───────────────────────────────────────────────────────
The definition of `I` has an unbound type variable:
1│ I := Int *
^
Tip: Type variables must be bound before the `:=`. Perhaps you intended
to add a type parameter to this type?
"#
),
)
}
#[test]
fn multiple_wildcards_in_alias() {
report_problem_as(
indoc!(
r#"
I : [ A (Int *), B (Int *) ]
a : I
a
"#
),
indoc!(
r#"
── UNBOUND TYPE VARIABLE ───────────────────────────────────────────────────────
The definition of `I` has 2 unbound type variables.
Here is one occurrence:
1│ I : [ A (Int *), B (Int *) ]
^
Tip: Type variables must be bound before the `:`. Perhaps you intended
to add a type parameter to this type?
"#
),
)
}
#[test]
fn inference_var_in_alias() {
report_problem_as(
indoc!(
r#"
I : Int _
a : I
a
"#
),
indoc!(
r#"
── UNBOUND TYPE VARIABLE ───────────────────────────────────────────────────────
The definition of `I` has an unbound type variable:
1│ I : Int _
^
Tip: Type variables must be bound before the `:`. Perhaps you intended
to add a type parameter to this type?
"#
),
)
}
#[test]
fn unbound_var_in_alias() {
report_problem_as(
indoc!(
r#"
I : Int a
a : I
a
"#
),
indoc!(
r#"
── UNBOUND TYPE VARIABLE ───────────────────────────────────────────────────────
The definition of `I` has an unbound type variable:
1│ I : Int a
^
Tip: Type variables must be bound before the `:`. Perhaps you intended
to add a type parameter to this type?
"#
),
)
}
#[test]
fn ability_bad_type_parameter() {
new_report_problem_as(
indoc!(
r#"
Hash a b c has
hash : a -> U64 | a has Hash
1
"#
),
indoc!(
r#"
── ABILITY HAS TYPE VARIABLES ──────────────────────────────────────────────────
The definition of the `Hash` ability includes type variables:
4│ Hash a b c has
^^^^^
Abilities cannot depend on type variables, but their member values
can!
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`Hash` is not used anywhere in your code.
4│ Hash a b c has
^^^^
If you didn't intend on using `Hash` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn alias_in_has_clause() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ hash ] to "./platform"
Hash has hash : a, b -> U64 | a has Hash, b has Bool
"#
),
indoc!(
r#"
── HAS CLAUSE IS NOT AN ABILITY ────────────────────────────────────────────────
The type referenced in this "has" clause is not an ability:
3│ Hash has hash : a, b -> U64 | a has Hash, b has Bool
^^^^
"#
),
)
}
#[test]
fn shadowed_type_variable_in_has_clause() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ ab1 ] to "./platform"
Ab1 has ab1 : a -> {} | a has Ab1, a has Ab1
"#
),
indoc!(
r#"
── DUPLICATE NAME ──────────────────────────────────────────────────────────────
The `a` name is first defined here:
3│ Ab1 has ab1 : a -> {} | a has Ab1, a has Ab1
^^^^^^^^^
But then it's defined a second time here:
3│ Ab1 has ab1 : a -> {} | a has Ab1, a has Ab1
^^^^^^^^^
Since these variables have the same name, it's easy to use the wrong
one on accident. Give one of them a new name.
"#
),
)
}
#[test]
fn alias_using_ability() {
new_report_problem_as(
indoc!(
r#"
Ability has ab : a -> {} | a has Ability
Alias : Ability
a : Alias
a
"#
),
indoc!(
r#"
── ALIAS USES ABILITY ──────────────────────────────────────────────────────────
The definition of the `Alias` aliases references the ability `Ability`:
6│ Alias : Ability
^^^^^
Abilities are not types, but you can add an ability constraint to a
type variable `a` by writing
| a has Ability
at the end of the type.
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`ab` is not used anywhere in your code.
4│ Ability has ab : a -> {} | a has Ability
^^
If you didn't intend on using `ab` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn ability_shadows_ability() {
new_report_problem_as(
indoc!(
r#"
Ability has ab : a -> U64 | a has Ability
Ability has ab1 : a -> U64 | a has Ability
1
"#
),
indoc!(
r#"
── DUPLICATE NAME ──────────────────────────────────────────────────────────────
The `Ability` name is first defined here:
4│ Ability has ab : a -> U64 | a has Ability
^^^^^^^
But then it's defined a second time here:
6│ Ability has ab1 : a -> U64 | a has Ability
^^^^^^^
Since these abilities have the same name, it's easy to use the wrong
one on accident. Give one of them a new name.
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`ab` is not used anywhere in your code.
4│ Ability has ab : a -> U64 | a has Ability
^^
If you didn't intend on using `ab` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn ability_member_does_not_bind_ability() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ ] to "./platform"
Ability has ab : {} -> {}
"#
),
indoc!(
r#"
── ABILITY MEMBER MISSING HAS CLAUSE ───────────────────────────────────────────
The definition of the ability member `ab` does not include a `has` clause
binding a type variable to the ability `Ability`:
3│ Ability has ab : {} -> {}
^^
Ability members must include a `has` clause binding a type variable to
an ability, like
a has Ability
Otherwise, the function does not need to be part of the ability!
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`Ability` is not used anywhere in your code.
3│ Ability has ab : {} -> {}
^^^^^^^
If you didn't intend on using `Ability` then remove it so future readers
of your code don't wonder why it is there.
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`ab` is not used anywhere in your code.
3│ Ability has ab : {} -> {}
^^
If you didn't intend on using `ab` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn ability_member_binds_extra_ability() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ eq ] to "./platform"
Eq has eq : a, a -> Bool | a has Eq
Hash has hash : a, b -> U64 | a has Eq, b has Hash
"#
),
indoc!(
r#"
── ABILITY MEMBER HAS EXTRANEOUS HAS CLAUSE ────────────────────────────────────
The definition of the ability member `hash` includes a has clause
binding an ability it is not a part of:
4│ Hash has hash : a, b -> U64 | a has Eq, b has Hash
^^^^^^^^
Currently, ability members can only bind variables to the ability they
are a part of.
Hint: Did you mean to bind the `Hash` ability instead?
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`hash` is not used anywhere in your code.
4│ Hash has hash : a, b -> U64 | a has Eq, b has Hash
^^^^
If you didn't intend on using `hash` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn ability_member_binds_parent_twice() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ ] to "./platform"
Eq has eq : a, b -> Bool | a has Eq, b has Eq
"#
),
indoc!(
r#"
── ABILITY MEMBER BINDS MULTIPLE VARIABLES ─────────────────────────────────────
The definition of the ability member `eq` includes multiple variables
bound to the `Eq`` ability:`
3│ Eq has eq : a, b -> Bool | a has Eq, b has Eq
^^^^^^^^^^^^^^^^^^
Ability members can only bind one type variable to their parent
ability. Otherwise, I wouldn't know what type implements an ability by
looking at specializations!
Hint: Did you mean to only bind `a` to `Eq`?
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`eq` is not used anywhere in your code.
3│ Eq has eq : a, b -> Bool | a has Eq, b has Eq
^^
If you didn't intend on using `eq` then remove it so future readers of
your code don't wonder why it is there.
"#
),
)
}
#[test]
fn has_clause_outside_of_ability() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ hash, f ] to "./platform"
Hash has hash : a -> U64 | a has Hash
f : a -> U64 | a has Hash
"#
),
indoc!(
r#"
── ILLEGAL HAS CLAUSE ──────────────────────────────────────────────────────────
A `has` clause is not allowed here:
5│ f : a -> U64 | a has Hash
^^^^^^^^^^
`has` clauses can only be specified on the top-level type annotation of
an ability member.
"#
),
)
}
#[test]
fn ability_specialization_with_non_implementing_type() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ hash ] to "./platform"
Hash has hash : a -> U64 | a has Hash
hash = \{} -> 0u64
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with this specialization of `hash`:
5│ hash = \{} -> 0u64
^^^^
This value is a declared specialization of type:
{}a -> U64
But the type annotation on `hash` says it must match:
a -> U64 | a has Hash
Note: Some types in this specialization don't implement the abilities
they are expected to. I found the following missing implementations:
{}a does not implement Hash
"#
),
)
}
#[test]
fn ability_specialization_does_not_match_type() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ hash ] to "./platform"
Hash has hash : a -> U64 | a has Hash
Id := U32
hash = \$Id n -> n
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with this specialization of `hash`:
7│ hash = \$Id n -> n
^^^^
This value is a declared specialization of type:
Id -> U32
But the type annotation on `hash` says it must match:
Id -> U64
"#
),
)
}
#[test]
fn ability_specialization_is_incomplete() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ eq, le ] to "./platform"
Eq has
eq : a, a -> Bool | a has Eq
le : a, a -> Bool | a has Eq
Id := U64
eq = \$Id m, $Id n -> m == n
"#
),
indoc!(
r#"
── INCOMPLETE ABILITY IMPLEMENTATION ───────────────────────────────────────────
The type `Id` does not fully implement the ability `Eq`. The following
specializations are missing:
A specialization for `le`, which is defined here:
5│ le : a, a -> Bool | a has Eq
^^
Note: `Id` specializes the following members of `Eq`:
`eq`, specialized here:
9│ eq = \$Id m, $Id n -> m == n
^^
"#
),
)
}
#[test]
fn ability_specialization_overly_generalized() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ hash ] to "./platform"
Hash has
hash : a -> U64 | a has Hash
hash = \_ -> 0u64
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
This specialization of `hash` is overly general:
6│ hash = \_ -> 0u64
^^^^
This value is a declared specialization of type:
a -> U64
But the type annotation on `hash` says it must match:
a -> U64 | a has Hash
Note: The specialized type is too general, and does not provide a
concrete type where a type variable is bound to an ability.
Specializations can only be made for concrete types. If you have a
generic implementation for this value, perhaps you don't need an
ability?
"#
),
)
}
#[test]
fn ability_specialization_conflicting_specialization_types() {
new_report_problem_as(
indoc!(
r#"
app "test" provides [ eq ] to "./platform"
Eq has
eq : a, a -> Bool | a has Eq
You := {}
AndI := {}
eq = \$You {}, $AndI {} -> False
"#
),
indoc!(
r#"
── TYPE MISMATCH ───────────────────────────────────────────────────────────────
Something is off with this specialization of `eq`:
9│ eq = \$You {}, $AndI {} -> False
^^
This value is a declared specialization of type:
You, AndI -> [ False, True ]
But the type annotation on `eq` says it must match:
You, You -> Bool
Tip: Type comparisons between an opaque type are only ever equal if
both types are the same opaque type. Did you mean to create an opaque
type by wrapping it? If I have an opaque type Age := U32 I can create
an instance of this opaque type by doing @Age 23.
"#
),
)
}
}
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