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Bubble up opaque <eq> opaque operations instead of picking an order

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This commit is contained in:
Oli Scherer 2023-08-07 14:49:44 +00:00
parent ad4dd759d8
commit 930affa39d
7 changed files with 127 additions and 21 deletions
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20
compiler/rustc_infer/src/infer/opaque_types.rs
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@ -145,7 +145,25 @@ impl<'tcx> InferCtxt<'tcx> {
return None;
}
}
DefiningAnchor::Bubble => {}
DefiningAnchor::Bubble => {
if let ty::Alias(ty::Opaque, _) = b.kind() {
// In bubble mode we don't know which of the two opaque types is supposed to have the other
// as a hidden type (both, none or either one of them could be in its defining scope).
let predicate = ty::PredicateKind::AliasRelate(
a.into(),
b.into(),
ty::AliasRelationDirection::Equate,
);
let obligation = traits::Obligation::new(
self.tcx,
cause.clone(),
param_env,
predicate,
);
let obligations = vec![obligation];
return Some(Ok(InferOk { value: (), obligations }));
}
}
DefiningAnchor::Error => return None,
};
if let ty::Alias(ty::Opaque, ty::AliasTy { def_id: b_def_id, .. }) = *b.kind() {