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Account for expected dyn Trait found impl Trait

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This commit is contained in:
Esteban Küber 2024-01-24 16:57:15 +00:00
parent d992d9cd56
commit 796814d916
3 changed files with 81 additions and 0 deletions
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20
compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs
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@ -294,6 +294,26 @@ impl<T> Trait<T> for X {
);
}
}
(ty::Dynamic(t, _, ty::DynKind::Dyn), ty::Alias(ty::Opaque, alias))
if let Some(def_id) = t.principal_def_id()
&& tcx.explicit_item_bounds(alias.def_id).skip_binder().iter().any(
|(pred, _span)| match pred.kind().skip_binder() {
ty::ClauseKind::Trait(trait_predicate)
if trait_predicate.polarity
== ty::ImplPolarity::Positive =>
{
trait_predicate.def_id() == def_id
}
_ => false,
},
) =>
{
diag.help(format!(
"you can box the `{}` to coerce it to `Box<{}>`, but you'll have to \
change the expected type as well",
values.found, values.expected,
));
}
(ty::Dynamic(t, _, ty::DynKind::Dyn), _)
if let Some(def_id) = t.principal_def_id() =>
{