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Note base types of coercion

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This commit is contained in:
Michael Goulet 2023-05-11 02:10:56 +00:00
parent 2a8221dbdf
commit 14bf909e71
65 changed files with 142 additions and 225 deletions
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21
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -2647,14 +2647,19 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
let predicates = predicates.instantiate_own(tcx, substs);
let mut obligations = Vec::with_capacity(predicates.len());
for (index, (predicate, span)) in predicates.into_iter().enumerate() {
let cause = cause.clone().derived_cause(parent_trait_pred, |derived| {
ImplDerivedObligation(Box::new(ImplDerivedObligationCause {
derived,
impl_or_alias_def_id: def_id,
impl_def_predicate_index: Some(index),
span,
}))
});
let cause =
if Some(parent_trait_pred.def_id()) == tcx.lang_items().coerce_unsized_trait() {
cause.clone()
} else {
cause.clone().derived_cause(parent_trait_pred, |derived| {
ImplDerivedObligation(Box::new(ImplDerivedObligationCause {
derived,
impl_or_alias_def_id: def_id,
impl_def_predicate_index: Some(index),
span,
}))
})
};
let predicate = normalize_with_depth_to(
self,
param_env,