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Instantiate binders when checking supertrait upcasting

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This commit is contained in:
Michael Goulet
2024-09-26 23:20:59 -04:00
parent d4ee408afc
commit 4fb097a5de
4 changed files with 132 additions and 48 deletions
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49
compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
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@@ -895,10 +895,13 @@ where
source_projection.item_def_id() == target_projection.item_def_id()
&& ecx
.probe(|_| ProbeKind::UpcastProjectionCompatibility)
.enter(|ecx| -> Result<(), NoSolution> {
ecx.sub(param_env, source_projection, target_projection)?;
let _ = ecx.try_evaluate_added_goals()?;
Ok(())
.enter(|ecx| -> Result<_, NoSolution> {
ecx.enter_forall(target_projection, |ecx, target_projection| {
let source_projection =
ecx.instantiate_binder_with_infer(source_projection);
ecx.eq(param_env, source_projection, target_projection)?;
ecx.try_evaluate_added_goals()
})
})
.is_ok()
};
@@ -909,11 +912,14 @@ where
// Check that a's supertrait (upcast_principal) is compatible
// with the target (b_ty).
ty::ExistentialPredicate::Trait(target_principal) => {
ecx.sub(
param_env,
upcast_principal.unwrap(),
bound.rebind(target_principal),
)?;
let source_principal = upcast_principal.unwrap();
let target_principal = bound.rebind(target_principal);
ecx.enter_forall(target_principal, |ecx, target_principal| {
let source_principal =
ecx.instantiate_binder_with_infer(source_principal);
ecx.eq(param_env, source_principal, target_principal)?;
ecx.try_evaluate_added_goals()
})?;
}
// Check that b_ty's projection is satisfied by exactly one of
// a_ty's projections. First, we look through the list to see if
@@ -934,7 +940,12 @@ where
Certainty::AMBIGUOUS,
);
}
ecx.sub(param_env, source_projection, target_projection)?;
ecx.enter_forall(target_projection, |ecx, target_projection| {
let source_projection =
ecx.instantiate_binder_with_infer(source_projection);
ecx.eq(param_env, source_projection, target_projection)?;
ecx.try_evaluate_added_goals()
})?;
}
// Check that b_ty's auto traits are present in a_ty's bounds.
ty::ExistentialPredicate::AutoTrait(def_id) => {
@@ -1187,17 +1198,15 @@ where
) -> Result<Vec<ty::Binder<I, I::Ty>>, NoSolution>,
) -> Result<Candidate<I>, NoSolution> {
self.probe_trait_candidate(source).enter(|ecx| {
ecx.add_goals(
GoalSource::ImplWhereBound,
constituent_tys(ecx, goal.predicate.self_ty())?
.into_iter()
.map(|ty| {
ecx.enter_forall(ty, |ty| {
goal.with(ecx.cx(), goal.predicate.with_self_ty(ecx.cx(), ty))
})
let goals = constituent_tys(ecx, goal.predicate.self_ty())?
.into_iter()
.map(|ty| {
ecx.enter_forall(ty, |ecx, ty| {
goal.with(ecx.cx(), goal.predicate.with_self_ty(ecx.cx(), ty))
})
.collect::<Vec<_>>(),
);
})
.collect::<Vec<_>>();
ecx.add_goals(GoalSource::ImplWhereBound, goals);
ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
})
}