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Only show "same type from differnt version" note when relevant

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This commit is contained in:
Esteban Küber 2024-08-20 18:59:00 +00:00
parent 8a568d9f15
commit 81b0de4356
1 changed files with 15 additions and 7 deletions
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8
compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
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@ -1750,6 +1750,7 @@ pub(super) fn report_similar_impl_candidates(
{
span.push_span_label(sp, label);
}
let mut points_at_type = false;
if let Some(found_type) = found_type {
span.push_span_label(
self.tcx.def_span(found_type),
@ -1772,6 +1773,7 @@ pub(super) fn report_similar_impl_candidates(
candidate_span,
"this type implements the required trait",
);
points_at_type = true;
}
}
}
@ -1783,6 +1785,11 @@ pub(super) fn report_similar_impl_candidates(
StringPart::highlighted(format!("{crate_name}")),
StringPart::normal("` in the dependency graph\n".to_string()),
]);
if points_at_type {
// We only clarify that the same type from different crate versions are not the
// same when we *find* the same type coming from different crate versions, otherwise
// it could be that it was a type provided by a different crate than the one that
// provides the trait, and mentioning this adds verbosity without clarification.
err.highlighted_note(vec![
StringPart::normal(
"two types coming from two different versions of the same crate are \
@ -1791,6 +1798,7 @@ pub(super) fn report_similar_impl_candidates(
),
StringPart::highlighted("even if they look the same".to_string()),
]);
}
err.highlighted_help(vec![
StringPart::normal("you can use `".to_string()),
StringPart::highlighted("cargo tree".to_string()),