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More information for fully-qualified suggestion when there are multiple impls #128527

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Aug 7, 2024
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Merged

More information for fully-qualified suggestion when there are multiple impls #128527

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70 changes: 49 additions & 21 deletions compiler/rustc_trait_selection/src/error_reporting/traits/ambiguity.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -388,39 +388,67 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
trait_impls.non_blanket_impls().values().flatten().count();
// If there is only one implementation of the trait, suggest using it.
// Otherwise, use a placeholder comment for the implementation.
let (message, self_type) = if non_blanket_impl_count == 1 {
let (message, self_types) = if non_blanket_impl_count == 1 {
(
"use the fully-qualified path to the only available \
implementation",
format!(
vec![format!(
"{}",
self.tcx.type_of(impl_def_id).instantiate_identity()
),
)],
)
} else if non_blanket_impl_count < 20 {
(
"use a fully-qualified path to one of the available \
implementations",
trait_impls
.non_blanket_impls()
.values()
.flatten()
.map(|id| {
format!(
"{}",
self.tcx.type_of(id).instantiate_identity()
)
})
.collect::<Vec<String>>(),
)
} else {
(
"use a fully-qualified path to a specific available \
implementation",
"/* self type */".to_string(),
vec!["/* self type */".to_string()],
)
};
let mut suggestions =
vec![(path.span.shrink_to_lo(), format!("<{self_type} as "))];
if let Some(generic_arg) = trait_path_segment.args {
let between_span =
trait_path_segment.ident.span.between(generic_arg.span_ext);
// get rid of :: between Trait and <type>
// must be '::' between them, otherwise the parser won't accept the code
suggestions.push((between_span, "".to_string()));
suggestions
.push((generic_arg.span_ext.shrink_to_hi(), ">".to_string()));
} else {
suggestions.push((
trait_path_segment.ident.span.shrink_to_hi(),
">".to_string(),
));
}
err.multipart_suggestion(
let suggestions: Vec<_> = self_types
.into_iter()
.map(|self_type| {
let mut suggestions = vec![(
path.span.shrink_to_lo(),
format!("<{self_type} as "),
)];
if let Some(generic_arg) = trait_path_segment.args {
let between_span = trait_path_segment
.ident
.span
.between(generic_arg.span_ext);
// get rid of :: between Trait and <type>
// must be '::' between them, otherwise the parser won't accept the code
suggestions.push((between_span, "".to_string()));
suggestions.push((
generic_arg.span_ext.shrink_to_hi(),
">".to_string(),
));
} else {
suggestions.push((
trait_path_segment.ident.span.shrink_to_hi(),
">".to_string(),
));
}
suggestions
})
.collect();
err.multipart_suggestions(
message,
suggestions,
Applicability::MaybeIncorrect,
Expand Down
8 changes: 5 additions & 3 deletions tests/ui/error-codes/E0283.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -7,10 +7,12 @@ LL | fn create() -> u32;
LL | let cont: u32 = Coroutine::create();
| ^^^^^^^^^^^^^^^^^^^ cannot call associated function of trait
|
help: use a fully-qualified path to a specific available implementation
help: use a fully-qualified path to one of the available implementations
|
LL | let cont: u32 = </* self type */ as Coroutine>::create();
| +++++++++++++++++++ +
LL | let cont: u32 = <Impl as Coroutine>::create();
| ++++++++ +
LL | let cont: u32 = <AnotherImpl as Coroutine>::create();
| +++++++++++++++ +

error[E0283]: type annotations needed
--> $DIR/E0283.rs:35:24
Expand Down
8 changes: 5 additions & 3 deletions tests/ui/error-codes/E0790.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -63,10 +63,12 @@ LL | fn my_fn();
LL | MyTrait2::my_fn();
| ^^^^^^^^^^^^^^^^^ cannot call associated function of trait
|
help: use a fully-qualified path to a specific available implementation
help: use a fully-qualified path to one of the available implementations
|
LL | </* self type */ as MyTrait2>::my_fn();
| +++++++++++++++++++ +
LL | <Impl1 as MyTrait2>::my_fn();
| +++++++++ +
LL | <Impl2 as MyTrait2>::my_fn();
| +++++++++ +

error: aborting due to 5 previous errors

Expand Down
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