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roc/compiler/reporting/tests/test_reporting.rs
Folkert 22a9779fe4 test case for alias diff reporting
2021-02-16 17:22:06 +01:00

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#[macro_use]
extern crate pretty_assertions;
#[macro_use]
extern crate indoc;
extern crate bumpalo;
extern crate roc_reporting;
mod helpers;
#[cfg(test)]
mod test_reporting {
use crate::helpers::test_home;
use crate::helpers::{can_expr, infer_expr, CanExprOut, ParseErrOut};
use bumpalo::Bump;
use roc_module::symbol::{Interns, ModuleId};
use roc_mono::ir::{Procs, Stmt};
use roc_mono::layout::LayoutCache;
use roc_reporting::report::{
can_problem, mono_problem, parse_problem, type_problem, Report, BLUE_CODE, BOLD_CODE,
CYAN_CODE, DEFAULT_PALETTE, GREEN_CODE, MAGENTA_CODE, RED_CODE, RESET_CODE, UNDERLINE_CODE,
WHITE_CODE, YELLOW_CODE,
};
use roc_reporting::report::{RocDocAllocator, RocDocBuilder};
use roc_solve::solve;
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<'b>(doc: RocDocBuilder<'b>) -> Report<'b> {
Report {
title: "".to_string(),
doc,
filename: filename_from_string(r"\code\proj\Main.roc"),
}
}
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,
constraint,
home,
mut interns,
problems: can_problems,
..
} = can_expr(arena, expr_src)?;
let mut subs = Subs::new(var_store.into());
for (var, name) in output.introduced_variables.name_by_var {
subs.rigid_var(var, name);
}
let mut unify_problems = Vec::new();
let (_content, mut subs) = infer_expr(subs, &mut unify_problems, &constraint, 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::default();
let mut ident_ids = interns.all_ident_ids.remove(&home).unwrap();
// Populate Procs and Subs, and get the low-level Expr from the canonical Expr
let mut layout_cache = LayoutCache::default();
let mut mono_env = roc_mono::ir::Env {
arena: &arena,
subs: &mut subs,
problems: &mut mono_problems,
home,
ident_ids: &mut ident_ids,
ptr_bytes: 8,
};
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 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_parse_problem(filename.clone(), src.as_bytes());
let doc = parse_problem(&alloc, 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, filename.clone(), problem.clone());
reports.push(report);
}
for problem in type_problems {
let report = type_problem(&alloc, filename.clone(), problem.clone());
reports.push(report);
}
for problem in mono_problems {
let report = mono_problem(&alloc, 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 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 {
if 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 human_readable(str: &str) -> String {
str.replace(RED_CODE, "<red>")
.replace(WHITE_CODE, "<white>")
.replace(BLUE_CODE, "<blue>")
.replace(YELLOW_CODE, "<yellow>")
.replace(GREEN_CODE, "<green>")
.replace(CYAN_CODE, "<cyan>")
.replace(MAGENTA_CODE, "<magenta>")
.replace(RESET_CODE, "<reset>")
.replace(BOLD_CODE, "<bold>")
.replace(UNDERLINE_CODE, "<underline>")
}
#[test]
fn value_not_exposed() {
report_problem_as(
indoc!(
r#"
List.foobar 1 2
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
The List module does not expose a foobar value:
1│ List.foobar 1 2
^^^^^^^^^^^
"#
),
)
}
#[test]
fn report_unused_def() {
report_problem_as(
indoc!(
r#"
x = 1
y = 2
x
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
`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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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 variables have the same name, it's easy to use the wrong
one on accident. Give one of them a new name.
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
`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.
"#
),
)
}
// #[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 unused_undefined_argument() {
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I cannot find a `bar` value
8│ 4 -> bar baz "yay"
^^^
these names seem close though:
baz
Nat
Str
U8
"#
),
)
}
#[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 report_unused_argument() {
// report_problem_as(
// indoc!(r#"
// y = 9
//
// box = \class, htmlChildren ->
// div [ class ] []
//
// div = 4
//
// box "wizard" []
// "#),
// indoc!(
// r#"
// 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."#
// ),
// );
// }
// #[test]
// fn report_unused_import() {
// report_problem_as(
// indoc!(r#"
// interface Report
// exposes [
// plainText,
// emText
// ]
// imports [
// Symbol.{ Interns }
// ]
//
// plainText = \str -> PlainText str
//
// emText = \str -> EmText str
// "#),
// indoc!(
// r#"
// Nothing from Symbol is used in this module.
//
// 6│ imports [
// 7│ Symbol.{ Interns }
// ^^^^^^
// 8│ ]
//
// Since Symbol isn't used, you don't need to import it."#
// ),
// );
// }
#[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>── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────<reset>
I cannot find a `theAdmin` value
<cyan>3<reset><cyan>│<reset> <white>theAdmin<reset>
<red>^^^^^^^^<reset>
these names seem close though:
Result
Num
Set
U8
"#
),
);
}
// #[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 2nd branch of this `if` does not match all the previous branches:
// 1│ if True then 2 else "foo"
// ^^^^^
// The 2nd branch is a string of type
// Str
// But all the previous branches have the type
// Num a
// "#
// ),
// )
// }
#[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 a }
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 a) ]
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:
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 a
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 a
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 a
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() {
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 ]a }
But the expression between `when` and `is` has the type:
{ foo : Num a }
"#
),
)
}
#[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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I cannot find a `foo` value
2│ { foo: 2 } -> foo
^^^
these names seem close though:
Bool
U8
F64
Nat
"#
),
)
}
#[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 ]b
"#
),
)
}
#[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 a }
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 a, b : Float b, 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:
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 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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
I cannot find a `ok` value
2│ f = \_ -> ok 4
^^
these names seem close though:
U8
f
I8
F64
"#
),
)
}
#[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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
`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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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 a
, bar : Num e
, 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]
#[ignore]
fn open_tag_union_can_grow() {
report_problem_as(
indoc!(
r#"
f : [ A ]* -> [ A, B, C ]
f = \a -> a
f
"#
),
// should not give errors
indoc!(""),
)
}
#[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#"
── UNSAFE PATTERN ──────────────────────────────────────────────────────────────
This pattern does not cover all the possibilities:
5│ (Left y) = x
^^^^^^
Other possibilities include:
Right _
I would have to crash if I saw one of those! You can use a binding to
deconstruct a value if there is only ONE possibility. Use a `when` to
account for all possibilities.
"#
),
)
}
#[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 : { x : Int * }
f : Foo -> Int *
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
tag.
"#
),
)
}
#[test]
fn record_duplicate_field_same_type() {
report_problem_as(
indoc!(
r#"
{ x: 4, y: 3, x: 4 }
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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#"
── SYNTAX 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.
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
`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_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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
The `a` type variable is not used in the `Foo` alias definition:
1│ Foo a : [ Foo ]
^
Roc does not allow unused type parameters!
Tip: If you want an unused type parameter (a so-called "phantom
type"), read the guide section on phantom data.
"#
),
)
}
#[test]
fn elm_function_syntax() {
report_problem_as(
indoc!(
r#"
f x y = x
"#
),
indoc!(
r#"
── PARSE PROBLEM ───────────────────────────────────────────────────────────────
Unexpected tokens in front of the `=` symbol:
1│ f x y = x
^^^
"#
),
)
}
#[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]
#[ignore]
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 }
"#
),
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) [ BCons (Num Integer) [ ACons Str [
BCons I64 [ ACons I64 (BList I64 I64), ANil ] as 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 = 9_223_372_036_854_775_807_000
y = -9_223_372_036_854_775_807_000
h = 0x8FFF_FFFF_FFFF_FFFF
l = -0x8FFF_FFFF_FFFF_FFFF
minlit = -9_223_372_036_854_775_808
maxlit = 9_223_372_036_854_775_807
x + y + h + l + minlit + maxlit
"#
),
indoc!(
r#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal is too big:
1│ x = 9_223_372_036_854_775_807_000
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Roc uses signed 64-bit integers, allowing values between
−9_223_372_036_854_775_808 and 9_223_372_036_854_775_807.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal is too small:
3│ y = -9_223_372_036_854_775_807_000
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Roc uses signed 64-bit integers, allowing values between
−9_223_372_036_854_775_808 and 9_223_372_036_854_775_807.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal is too big:
5│ h = 0x8FFF_FFFF_FFFF_FFFF
^^^^^^^^^^^^^^^^^^^^^
Roc uses signed 64-bit integers, allowing values between
−9_223_372_036_854_775_808 and 9_223_372_036_854_775_807.
Tip: Learn more about number literals at TODO
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
This integer literal is too small:
6│ l = -0x8FFF_FFFF_FFFF_FFFF
^^^^^^^^^^^^^^^^^^^^^^
Roc uses signed 64-bit integers, allowing values between
−9_223_372_036_854_775_808 and 9_223_372_036_854_775_807.
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.
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.
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.
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.
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.
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.
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.
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
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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
The `Foo` module is not imported:
1│ Foo.test
^^^^^^^^
Is there an import missing? Perhaps there is a typo, these names seem
close:
Bool
Num
Set
Str
"#
),
)
}
#[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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
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, for example
in affectation:
{ 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#"
── SYNTAX PROBLEM ──────────────────────────────────────────────────────────────
`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 ──────────────────────────────────────────────────────────────
The `Foo.Bar` identifier is malformed:
1│ Foo.Bar
^^^^^^^
"#
),
)
}
#[test]
#[ignore]
fn type_annotation_double_colon() {
report_problem_as(
indoc!(
r#"
f :: I64
f = 42
f
"#
),
indoc!(
r#"
── PARSE PROBLEM ───────────────────────────────────────────────────────────────
Unexpected token :
1│ f :: I64
^
"#
),
)
}
#[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 ───────────────────────────────────────────────────────────────
The `add` function expects 2 arguments, but it got 4 instead:
4│ Num.add 1 2
^^^^^^^
Are there any missing commas? Or missing parentheses?
"#
),
)
}
#[test]
fn invalid_operator() {
// NOTE: VERY BAD ERROR MESSAGE
report_problem_as(
indoc!(
r#"
main =
5 ** 3
"#
),
indoc!(
r#"
── PARSE PROBLEM ───────────────────────────────────────────────────────────────
Unexpected token :
2│ 5 ** 3
^
"#
),
)
}
#[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_indent_end() {
report_problem_as(
indoc!(
r#"
f : { a: Int
}
"#
),
indoc!(
r#"
── NEED MORE INDENTATION ───────────────────────────────────────────────────────
I am partway through parsing a record type, but I got stuck here:
1│ f : { a: Int
2│ }
^
I need this curly brace to be indented more. Try adding more spaces
before it!
"#
),
)
}
#[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]
#[ignore]
fn comment_with_tab() {
report_problem_as(
"# comment with a \t\n4",
indoc!(
r#"
── TAB CHARACTER ───────────────────────────────────────────────────────────────
I encountered a tab character
1│ f : { foo }
^
Tab characters are not allowed.
"#
),
)
}
#[test]
#[ignore]
fn type_in_parens_start() {
report_problem_as(
indoc!(
r#"
f : (
"#
),
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 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 closing parenthesis before this, so try
adding a ) and see if that helps?
"#
),
)
}
#[test]
fn type_apply_double_dot() {
report_problem_as(
indoc!(
r#"
f : Foo..Bar
"#
),
indoc!(
r#"
── 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.
"#
),
indoc!(
r#"
── 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]
#[ignore]
fn type_apply_stray_dot() {
// TODO good message
report_problem_as(
indoc!(
r#"
f : .
"#
),
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 closing parenthesis before this, so try
adding a ) and see if that helps?
"#
),
)
}
#[test]
fn type_apply_start_with_number() {
report_problem_as(
indoc!(
r#"
f : Foo.1
"#
),
indoc!(
r#"
── 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
"#
),
indoc!(
r#"
── WEIRD QUALIFIED NAME ────────────────────────────────────────────────────────
I encountered a lowercase letter at the start of a qualified name
segment:
1│ f : Foo.foo
^
All parts of a qualified type name must start with an uppercase
letter, like Num.I64 or List.List a.
"#
),
)
}
#[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 encounterd 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 just started 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
"#
),
)
}
}
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