bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Instantiate binders when checking supertrait upcasting

Browse source
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
Download patch file Download diff file Expand all files Collapse all files

16
compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs
View file

@ -448,10 +448,10 @@ where
}
}
} else {
self.delegate.enter_forall(kind, |kind| {
let goal = goal.with(self.cx(), ty::Binder::dummy(kind));
self.add_goal(GoalSource::InstantiateHigherRanked, goal);
self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
self.enter_forall(kind, |ecx, kind| {
let goal = goal.with(ecx.cx(), ty::Binder::dummy(kind));
ecx.add_goal(GoalSource::InstantiateHigherRanked, goal);
ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
})
}
}
@ -840,12 +840,14 @@ where
self.delegate.instantiate_binder_with_infer(value)
}
/// `enter_forall`, but takes `&mut self` and passes it back through the
/// callback since it can't be aliased during the call.
pub(super) fn enter_forall<T: TypeFoldable<I> + Copy, U>(
&self,
&mut self,
value: ty::Binder<I, T>,
f: impl FnOnce(T) -> U,
f: impl FnOnce(&mut Self, T) -> U,
) -> U {
self.delegate.enter_forall(value, f)
self.delegate.enter_forall(value, |value| f(self, value))
}
pub(super) fn resolve_vars_if_possible<T>(&self, value: T) -> T

49
compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
View file

@ -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)
})
}