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Probe when assembling upcast candidates so they don't step on eachother's toes

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This commit is contained in:
Michael Goulet 2023-08-15 00:48:09 +00:00
parent 1b198b3a19
commit ab126c2a4e
4 changed files with 27 additions and 13 deletions
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22
compiler/rustc_trait_selection/src/solve/trait_goals.rs
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@ -552,16 +552,18 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
self.walk_vtable(
a_principal.with_self_ty(tcx, a_ty),
|ecx, new_a_principal, _, vtable_vptr_slot| {
if let Ok(resp) = ecx.consider_builtin_upcast_to_principal(
goal,
a_data,
a_region,
b_data,
b_region,
Some(new_a_principal.map_bound(|trait_ref| {
ty::ExistentialTraitRef::erase_self_ty(tcx, trait_ref)
})),
) {
if let Ok(resp) = ecx.probe_candidate("dyn upcast").enter(|ecx| {
ecx.consider_builtin_upcast_to_principal(
goal,
a_data,
a_region,
b_data,
b_region,
Some(new_a_principal.map_bound(|trait_ref| {
ty::ExistentialTraitRef::erase_self_ty(tcx, trait_ref)
})),
)
}) {
responses
.push((resp, BuiltinImplSource::TraitUpcasting { vtable_vptr_slot }));
}