mirror of
https://github.com/roc-lang/roc.git
synced 2025-10-02 00:01:16 +00:00
1163 lines
21 KiB
Rust
1163 lines
21 KiB
Rust
#[macro_use]
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extern crate pretty_assertions;
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#[macro_use]
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extern crate indoc;
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extern crate bumpalo;
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extern crate roc;
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mod helpers;
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#[cfg(test)]
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mod test_infer {
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use crate::helpers::{can_expr, with_larger_debug_stack};
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use roc::infer::infer_expr;
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use roc::pretty_print_types::{content_to_string, name_all_type_vars};
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use roc::subs::Subs;
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// HELPERS
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fn infer_eq(src: &str, expected: &str) {
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let (_, output, _, var_store, variable, constraint) = can_expr(src);
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let mut subs = Subs::new(var_store.into());
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for (var, name) in output.rigids {
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subs.rigid_var(var, name);
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}
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let mut unify_problems = Vec::new();
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let content = infer_expr(&mut subs, &mut unify_problems, &constraint, variable);
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name_all_type_vars(variable, &mut subs);
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let actual_str = content_to_string(content, &mut subs);
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assert_eq!(actual_str, expected.to_string());
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}
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#[test]
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fn int_literal() {
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infer_eq("5", "Int");
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}
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#[test]
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fn float_literal() {
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infer_eq("0.5", "Float");
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}
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#[test]
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fn string_literal() {
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infer_eq(
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indoc!(
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r#"
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"type inference!"
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"#
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),
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"Str",
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);
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}
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#[test]
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fn empty_string() {
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infer_eq(
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indoc!(
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r#"
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""
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"#
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),
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"Str",
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);
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}
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// #[test]
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// fn block_string_literal() {
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// infer_eq(
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// indoc!(
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// r#"
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// """type
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// inference!"""
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// "#
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// ),
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// "Str",
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// );
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// }
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// LIST
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#[test]
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fn empty_list() {
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infer_eq(
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indoc!(
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r#"
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[]
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"#
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),
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"List *",
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);
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}
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#[test]
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fn list_of_lists() {
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infer_eq(
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indoc!(
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r#"
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[[]]
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"#
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),
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"List (List *)",
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);
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}
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#[test]
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fn triple_nested_list() {
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infer_eq(
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indoc!(
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r#"
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[[[]]]
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"#
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),
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"List (List (List *))",
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);
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}
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#[test]
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fn nested_empty_list() {
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infer_eq(
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indoc!(
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r#"
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[ [], [ [] ] ]
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"#
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),
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"List (List (List *))",
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);
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}
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// #[test]
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// fn concat_different_types() {
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// infer_eq(
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// indoc!(
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// r#"
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// empty = []
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// one = List.concat [ 1 ] empty
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// str = List.concat [ "blah" ] empty
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// empty
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// "#
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// ),
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// "List *",
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// );
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// }
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#[test]
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fn list_of_one_int() {
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infer_eq(
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indoc!(
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r#"
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[42]
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"#
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),
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"List Int",
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);
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}
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#[test]
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fn triple_nested_int_list() {
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infer_eq(
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indoc!(
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r#"
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[[[ 5 ]]]
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"#
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),
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"List (List (List Int))",
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);
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}
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#[test]
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fn list_of_ints() {
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infer_eq(
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indoc!(
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r#"
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[ 1, 2, 3 ]
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"#
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),
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"List Int",
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);
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}
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#[test]
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fn nested_list_of_ints() {
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infer_eq(
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indoc!(
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r#"
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[ [ 1 ], [ 2, 3 ] ]
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"#
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),
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"List (List Int)",
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);
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}
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#[test]
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fn list_of_one_string() {
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infer_eq(
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indoc!(
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r#"
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[ "cowabunga" ]
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"#
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),
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"List Str",
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);
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}
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#[test]
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fn triple_nested_string_list() {
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infer_eq(
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indoc!(
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r#"
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[[[ "foo" ]]]
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"#
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),
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"List (List (List Str))",
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);
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}
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#[test]
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fn list_of_strings() {
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infer_eq(
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indoc!(
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r#"
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[ "foo", "bar" ]
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"#
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),
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"List Str",
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);
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}
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// // INTERPOLATED STRING
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// #[test]
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// fn infer_interpolated_string() {
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// infer_eq(
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// indoc!(
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// r#"
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// whatItIs = "great"
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// "type inference is \(whatItIs)!"
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// "#
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// ),
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// "Str",
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// );
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// }
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// LIST MISMATCH
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#[test]
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fn mismatch_heterogeneous_list() {
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infer_eq(
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indoc!(
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r#"
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[ "foo", 5 ]
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"#
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),
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"List <type mismatch>",
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);
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}
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#[test]
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fn mismatch_heterogeneous_nested_list() {
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infer_eq(
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indoc!(
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r#"
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[ [ "foo", 5 ] ]
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"#
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),
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"List (List <type mismatch>)",
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);
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}
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#[test]
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fn mismatch_heterogeneous_nested_empty_list() {
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infer_eq(
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indoc!(
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r#"
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[ [ 1 ], [ [] ] ]
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"#
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),
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"List <type mismatch>",
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);
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}
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// CLOSURE
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#[test]
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fn always_return_empty_record() {
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infer_eq(
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indoc!(
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r#"
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\_ -> {}
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"#
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),
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"* -> {}",
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);
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}
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#[test]
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fn two_arg_return_int() {
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infer_eq(
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indoc!(
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r#"
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\_, _ -> 42
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"#
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),
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"*, * -> Int",
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);
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}
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#[test]
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fn three_arg_return_string() {
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infer_eq(
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indoc!(
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r#"
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\_, _, _ -> "test!"
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"#
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),
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"*, *, * -> Str",
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);
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}
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// DEF
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#[test]
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fn def_empty_record() {
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infer_eq(
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indoc!(
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r#"
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foo = {}
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foo
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"#
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),
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"{}",
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);
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}
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#[test]
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fn def_string() {
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infer_eq(
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indoc!(
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r#"
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str = "thing"
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str
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"#
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),
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"Str",
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);
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}
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#[test]
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fn def_1_arg_closure() {
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infer_eq(
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indoc!(
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r#"
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fn = \_ -> {}
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fn
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"#
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),
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"* -> {}",
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);
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}
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#[test]
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fn def_2_arg_closure() {
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infer_eq(
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indoc!(
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r#"
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func = \_, _ -> 42
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func
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"#
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),
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"*, * -> Int",
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);
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}
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#[test]
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fn def_3_arg_closure() {
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infer_eq(
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indoc!(
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r#"
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f = \_, _, _ -> "test!"
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f
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"#
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),
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"*, *, * -> Str",
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);
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}
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#[test]
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fn def_multiple_functions() {
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infer_eq(
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indoc!(
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r#"
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a = \_, _, _ -> "test!"
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b = a
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b
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"#
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),
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"*, *, * -> Str",
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);
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}
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#[test]
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fn def_multiple_strings() {
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infer_eq(
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indoc!(
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r#"
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a = "test!"
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b = a
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b
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"#
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),
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"Str",
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);
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}
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#[test]
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fn def_multiple_ints() {
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infer_eq(
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indoc!(
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r#"
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c = b
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b = a
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a = 42
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c
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"#
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),
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"Int",
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);
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}
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#[test]
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fn def_returning_closure() {
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infer_eq(
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indoc!(
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r#"
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f = \z -> z
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g = \z -> z
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(\x ->
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a = f x
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b = g x
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x
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)
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"#
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),
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"a -> a",
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);
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}
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// CALLING FUNCTIONS
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#[test]
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fn call_returns_int() {
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infer_eq(
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indoc!(
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r#"
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alwaysFive = \_ -> 5
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alwaysFive "stuff"
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"#
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),
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"Int",
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);
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}
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#[test]
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fn identity_returns_given_type() {
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infer_eq(
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indoc!(
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r#"
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identity = \a -> a
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identity "hi"
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"#
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),
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"Str",
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);
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}
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#[test]
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fn identity_infers_principal_type() {
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infer_eq(
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indoc!(
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r#"
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identity = \x -> x
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y = identity 5
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identity
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"#
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),
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"a -> a",
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);
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}
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#[test]
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fn identity_works_on_incompatible_types() {
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infer_eq(
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indoc!(
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r#"
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identity = \a -> a
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x = identity 5
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y = identity "hi"
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x
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"#
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),
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"Int",
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);
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}
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#[test]
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fn call_returns_list() {
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infer_eq(
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indoc!(
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r#"
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enlist = \val -> [ val ]
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enlist 5
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"#
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),
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"List Int",
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);
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}
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#[test]
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fn indirect_always() {
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infer_eq(
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indoc!(
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r#"
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always = \val -> (\_ -> val)
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alwaysFoo = always "foo"
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alwaysFoo 42
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"#
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),
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"Str",
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);
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}
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#[test]
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fn pizza_desugar() {
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infer_eq(
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indoc!(
|
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r#"
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1 |> (\a -> a)
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"#
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),
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"Int",
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);
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}
|
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#[test]
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fn pizza_desugar_two_arguments() {
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infer_eq(
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indoc!(
|
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r#"
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always = \a, b -> a
|
|
|
|
1 |> always "foo"
|
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"#
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),
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"Int",
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);
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}
|
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|
|
#[test]
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fn anonymous_identity() {
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infer_eq(
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indoc!(
|
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r#"
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(\a -> a) 3.14
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"#
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|
),
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"Float",
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);
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}
|
|
|
|
#[test]
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|
fn identity_of_identity() {
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infer_eq(
|
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indoc!(
|
|
r#"
|
|
(\val -> val) (\val -> val)
|
|
"#
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|
),
|
|
"a -> a",
|
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);
|
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}
|
|
|
|
#[test]
|
|
fn recursive_identity() {
|
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infer_eq(
|
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indoc!(
|
|
r#"
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identity = \val -> val
|
|
|
|
identity identity
|
|
"#
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|
),
|
|
"a -> a",
|
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);
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}
|
|
|
|
#[test]
|
|
fn identity_function() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
\val -> val
|
|
"#
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|
),
|
|
"a -> a",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn use_apply() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
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|
apply = \f, x -> f x
|
|
identity = \a -> a
|
|
|
|
apply identity 5
|
|
"#
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|
),
|
|
"Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn apply_function() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
\f, x -> f x
|
|
"#
|
|
),
|
|
"(a -> b), a -> b",
|
|
);
|
|
}
|
|
|
|
// #[test]
|
|
// TODO FIXME this should pass, but instead fails to canonicalize
|
|
// fn use_flip() {
|
|
// infer_eq(
|
|
// indoc!(
|
|
// r#"
|
|
// flip = \f -> (\a b -> f b a)
|
|
// neverendingInt = \f int -> f int
|
|
// x = neverendingInt (\a -> a) 5
|
|
|
|
// flip neverendingInt
|
|
// "#
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|
// ),
|
|
// "(Int, (a -> a)) -> Int",
|
|
// );
|
|
// }
|
|
|
|
#[test]
|
|
fn flip_function() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
\f -> (\a, b -> f b a),
|
|
"#
|
|
),
|
|
"(a, b -> c) -> (b, a -> c)",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn always_function() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
\val -> \_ -> val
|
|
"#
|
|
),
|
|
"a -> (* -> a)",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn pass_a_function() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
\f -> f {}
|
|
"#
|
|
),
|
|
"({} -> a) -> a",
|
|
);
|
|
}
|
|
|
|
// OPERATORS
|
|
|
|
// #[test]
|
|
// fn div_operator() {
|
|
// infer_eq(
|
|
// indoc!(
|
|
// r#"
|
|
// \l r -> l / r
|
|
// "#
|
|
// ),
|
|
// "Float, Float -> Float",
|
|
// );
|
|
// }
|
|
|
|
// #[test]
|
|
// fn basic_float_division() {
|
|
// infer_eq(
|
|
// indoc!(
|
|
// r#"
|
|
// 1 / 2
|
|
// "#
|
|
// ),
|
|
// "Float",
|
|
// );
|
|
// }
|
|
|
|
// #[test]
|
|
// fn basic_int_division() {
|
|
// infer_eq(
|
|
// indoc!(
|
|
// r#"
|
|
// 1 // 2
|
|
// "#
|
|
// ),
|
|
// "Int",
|
|
// );
|
|
// }
|
|
|
|
// #[test]
|
|
// fn basic_addition() {
|
|
// infer_eq(
|
|
// indoc!(
|
|
// r#"
|
|
// 1 + 2
|
|
// "#
|
|
// ),
|
|
// "Int",
|
|
// );
|
|
// }
|
|
|
|
// #[test]
|
|
// fn basic_circular_type() {
|
|
// infer_eq(
|
|
// indoc!(
|
|
// r#"
|
|
// \x -> x x
|
|
// "#
|
|
// ),
|
|
// "<Type Mismatch: Circular Type>",
|
|
// );
|
|
// }
|
|
|
|
// #[test]
|
|
// fn y_combinator_has_circular_type() {
|
|
// assert_eq!(
|
|
// infer(indoc!(r#"
|
|
// \f -> (\x -> f x x) (\x -> f x x)
|
|
// "#)),
|
|
// Erroneous(Problem::CircularType)
|
|
// );
|
|
// }
|
|
|
|
// #[test]
|
|
// fn no_higher_ranked_types() {
|
|
// // This should error because it can't type of alwaysFive
|
|
// infer_eq(
|
|
// indoc!(
|
|
// r#"
|
|
// \always -> [ always [], always "" ]
|
|
// "#
|
|
// ),
|
|
// "<type mismatch>",
|
|
// );
|
|
// }
|
|
|
|
#[test]
|
|
fn always_with_list() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
alwaysFive = \_ -> 5
|
|
|
|
[ alwaysFive "foo", alwaysFive [] ]
|
|
"#
|
|
),
|
|
"List Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn if_with_int_literals() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
if True then
|
|
42
|
|
else
|
|
24
|
|
"#
|
|
),
|
|
"Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn when_with_int_literals() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
when 1 is
|
|
1 -> 2
|
|
3 -> 4
|
|
"#
|
|
),
|
|
"Int",
|
|
);
|
|
}
|
|
|
|
// RECORDS
|
|
|
|
#[test]
|
|
fn empty_record() {
|
|
infer_eq("{}", "{}");
|
|
}
|
|
|
|
#[test]
|
|
fn one_field_record() {
|
|
infer_eq("{ x: 5 }", "{ x : Int }");
|
|
}
|
|
|
|
#[test]
|
|
fn two_field_record() {
|
|
infer_eq("{ x: 5, y : 3.14 }", "{ x : Int, y : Float }");
|
|
}
|
|
|
|
#[test]
|
|
fn record_literal_accessor() {
|
|
infer_eq("{ x: 5, y : 3.14 }.x", "Int");
|
|
}
|
|
|
|
#[test]
|
|
fn record_arg() {
|
|
infer_eq("\\rec -> rec.x", "{ x : a }* -> a");
|
|
}
|
|
|
|
#[test]
|
|
fn record_with_bound_var() {
|
|
with_larger_debug_stack(|| {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
fn = \rec ->
|
|
x = rec.x
|
|
|
|
rec
|
|
|
|
fn
|
|
"#
|
|
),
|
|
"{ x : a }b -> { x : a }b",
|
|
);
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn using_type_signature() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
bar : custom -> custom
|
|
bar = \x -> x
|
|
|
|
bar
|
|
"#
|
|
),
|
|
"custom -> custom",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn type_signature_without_body() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
foo: Int -> Bool
|
|
|
|
foo 2
|
|
"#
|
|
),
|
|
"Bool",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn type_signature_without_body_rigid() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
foo : Int -> custom
|
|
|
|
foo 2
|
|
"#
|
|
),
|
|
"custom",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn accessor_function() {
|
|
infer_eq(".foo", "{ foo : a }* -> a");
|
|
}
|
|
|
|
#[test]
|
|
fn type_signature_without_body_record() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
{ x, y } : { x : (Int -> custom) , y : Int }
|
|
|
|
x
|
|
"#
|
|
),
|
|
"Int -> custom",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn record_pattern_match_infer() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
when foo is
|
|
{ x: 4 }-> x
|
|
"#
|
|
),
|
|
"Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn empty_record_pattern() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
# technically, an empty record can be destructured
|
|
{} = {}
|
|
bar = \{} -> 42
|
|
|
|
when foo is
|
|
{ x: {} } -> x
|
|
"#
|
|
),
|
|
"{}*",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn record_type_annotation() {
|
|
// check that a closed record remains closed
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
foo : { x : custom } -> custom
|
|
foo = \{ x } -> x
|
|
|
|
foo
|
|
"#
|
|
),
|
|
"{ x : custom } -> custom",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn record_update() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
user = { year: "foo", name: "Sam" }
|
|
|
|
{ user & year: "foo" }
|
|
"#
|
|
),
|
|
"{ name : Str, year : Str }",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn bare_tag() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"Foo
|
|
"#
|
|
),
|
|
"[ Foo ]*",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn single_tag_pattern() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"\Foo -> 42
|
|
"#
|
|
),
|
|
"[ Foo ]* -> Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn single_private_tag_pattern() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"\@Foo -> 42
|
|
"#
|
|
),
|
|
"[ Test.@Foo ]* -> Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn two_tag_pattern() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"\x ->
|
|
when x is
|
|
True -> 1
|
|
False -> 0
|
|
"#
|
|
),
|
|
"[ False, True ]* -> Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn tag_application() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"Foo "happy" 2020
|
|
"#
|
|
),
|
|
"[ Foo Str Int ]*",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn private_tag_application() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"@Foo "happy" 2020
|
|
"#
|
|
),
|
|
"[ Test.@Foo Str Int ]*",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn record_extraction() {
|
|
with_larger_debug_stack(|| {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
f = \x ->
|
|
when x is
|
|
{ a, b } -> a
|
|
|
|
f
|
|
"#
|
|
),
|
|
"{ a : a, b : * }* -> a",
|
|
);
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn record_field_pattern_match_with_guard() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
when foo is
|
|
{ x: 4 } -> x
|
|
"#
|
|
),
|
|
"Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn tag_union_pattern_match() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
\Foo x -> Foo x
|
|
"#
|
|
),
|
|
"[ Foo a ]* -> [ Foo a ]*",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn tag_union_pattern_match_ignored_field() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
\Foo x _ -> Foo x "y"
|
|
"#
|
|
),
|
|
// TODO investigate should `Foo a *` be `Foo a Str`, i.e. should it know that `Foo`
|
|
// is used at `Str` elsewhere as a function? does it ever matter?
|
|
"[ Foo a * ]* -> [ Foo a Str ]*",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn global_tag_with_field() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
when Foo 4 is
|
|
Foo x -> x
|
|
"#
|
|
),
|
|
"Int",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn private_tag_with_field() {
|
|
infer_eq(
|
|
indoc!(
|
|
r#"
|
|
when @Foo 4 is
|
|
@Foo x -> x
|
|
"#
|
|
),
|
|
"Int",
|
|
);
|
|
}
|
|
}
|