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Tweak highlighting when trait is available for different type

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When printing

```
  = help: the trait `chumsky::private::ParserSealed<'_, &'a str, ((), ()), chumsky::extra::Full<EmptyErr, (), ()>>` is implemented for `Then<Ignored<chumsky::combinator::Filter<chumsky::primitive::Any<&str, chumsky::extra::Full<EmptyErr, (), ()>>, {closure@src/main.rs:9:17: 9:27}>, char>, chumsky::combinator::Map<impl CSTParser<'a, O>, O, {closure@src/main.rs:11:24: 11:27}>, (), (), chumsky::extra::Full<EmptyErr, (), ()>>`
  = help: for that trait implementation, expected `((), ())`, found `()`
```

Highlight only the `expected` and `found` types, instead of the full type in the first `help`.
This commit is contained in:
Esteban Küber 2024-10-24 00:20:04 +00:00
parent 24ac777a64
commit aa82fd6d1d
2 changed files with 16 additions and 7 deletions
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19
compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
View File

@ -1835,6 +1835,7 @@ pub(super) fn report_similar_impl_candidates(
if impl_trait_ref.references_error() {
return false;
}
let self_ty = impl_trait_ref.self_ty().to_string();
err.highlighted_help(vec![
StringPart::normal(format!(
"the trait `{}` ",
@ -1842,16 +1843,24 @@ pub(super) fn report_similar_impl_candidates(
)),
StringPart::highlighted("is"),
StringPart::normal(" implemented for `"),
StringPart::highlighted(impl_trait_ref.self_ty().to_string()),
if let [TypeError::Sorts(_)] = &terrs[..] {
StringPart::normal(self_ty)
} else {
StringPart::highlighted(self_ty)
},
StringPart::normal("`"),
]);
if let [TypeError::Sorts(exp_found)] = &terrs[..] {
let exp_found = self.resolve_vars_if_possible(*exp_found);
err.help(format!(
"for that trait implementation, expected `{}`, found `{}`",
exp_found.expected, exp_found.found
));
err.highlighted_help(vec![
StringPart::normal("for that trait implementation, "),
StringPart::normal("expected `"),
StringPart::highlighted(exp_found.expected.to_string()),
StringPart::normal("`, found `"),
StringPart::highlighted(exp_found.found.to_string()),
StringPart::normal("`"),
]);
}
true

4
tests/ui/impl-trait/diagnostics/highlight-difference-between-expected-trait-and-found-trait.svg
View File

@ -33,9 +33,9 @@
</tspan>
<tspan x="10px" y="118px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan>
</tspan>
<tspan x="10px" y="136px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">= </tspan><tspan class="bold">help</tspan><tspan>: the trait `Bar&lt;()&gt;` </tspan><tspan class="fg-magenta bold">is</tspan><tspan> implemented for `</tspan><tspan class="fg-magenta bold">Struct</tspan><tspan>`</tspan>
<tspan x="10px" y="136px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">= </tspan><tspan class="bold">help</tspan><tspan>: the trait `Bar&lt;()&gt;` </tspan><tspan class="fg-magenta bold">is</tspan><tspan> implemented for `Struct`</tspan>
</tspan>
<tspan x="10px" y="154px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">= </tspan><tspan class="bold">help</tspan><tspan>: for that trait implementation, expected `()`, found `i32`</tspan>
<tspan x="10px" y="154px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">= </tspan><tspan class="bold">help</tspan><tspan>: for that trait implementation, expected `</tspan><tspan class="fg-magenta bold">()</tspan><tspan>`, found `</tspan><tspan class="fg-magenta bold">i32</tspan><tspan>`</tspan>
</tspan>
<tspan x="10px" y="172px"><tspan class="fg-ansi256-010 bold">note</tspan><tspan>: required for `Struct` to implement `Foo&lt;i32&gt;`</tspan>
</tspan>

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