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Improve error message

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This commit is contained in:
ayazhafiz 2022-04-07 22:26:17 -04:00
parent 02e1a98cac
commit 13a17f1858
2 changed files with 17 additions and 0 deletions
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10
reporting/src/error/canonicalize.rs
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@ -615,6 +615,16 @@ pub fn can_problem<'b>(
alloc.reflow(":"),
]),
alloc.region(lines.convert_region(region)),
alloc.concat(vec![
alloc.reflow("Abilities are not types, but you can add an ability constraint to a type variable "),
alloc.type_variable("a".into()),
alloc.reflow(" by writing"),
]),
alloc.type_block(alloc.concat(vec![
alloc.reflow("| a has "),
alloc.symbol_unqualified(ability),
])),
alloc.reflow(" at the end of the type."),
]);
title = ALIAS_USES_ABILITY.to_string();
severity = Severity::RuntimeError;

7
reporting/tests/test_reporting.rs
View file

@ -9030,6 +9030,13 @@ I need all branches in an `if` to have the same type!
3│ Alias : Ability
^^^^^
Abilities are not types, but you can add an ability constraint to a
type variable `a` by writing
| a has Ability
at the end of the type.
── UNUSED DEFINITION ───────────────────────────────────────────────────────────
`ab` is not used anywhere in your code.