bjoernager/rust
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Hack out effects support for old solver

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This commit is contained in:
Michael Goulet 2024-10-22 03:22:57 +00:00
parent 3f1be1ec7e
commit 8b7b8e5f56
37 changed files with 302 additions and 192 deletions
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20
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -49,7 +49,7 @@ use crate::infer::{InferCtxt, InferOk, TypeFreshener};
use crate::solve::InferCtxtSelectExt as _;
use crate::traits::normalize::{normalize_with_depth, normalize_with_depth_to};
use crate::traits::project::{ProjectAndUnifyResult, ProjectionCacheKeyExt};
use crate::traits::{ProjectionCacheKey, Unimplemented};
use crate::traits::{ProjectionCacheKey, Unimplemented, effects};
mod _match;
mod candidate_assembly;
@ -645,11 +645,19 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
self.evaluate_trait_predicate_recursively(previous_stack, obligation)
}
ty::PredicateKind::Clause(ty::ClauseKind::HostEffect(..)) => {
// FIXME(effects): It should be relatively straightforward to implement
// old trait solver support for `HostEffect` bounds; or at least basic
// support for them.
todo!()
ty::PredicateKind::Clause(ty::ClauseKind::HostEffect(data)) => {
self.infcx.enter_forall(bound_predicate.rebind(data), |data| {
match effects::evaluate_host_effect_obligation(
self,
&obligation.with(self.tcx(), data),
) {
Ok(nested) => {
self.evaluate_predicates_recursively(previous_stack, nested)
}
Err(effects::EvaluationFailure::Ambiguous) => Ok(EvaluatedToAmbig),
Err(effects::EvaluationFailure::NoSolution) => Ok(EvaluatedToErr),
}
})
}
ty::PredicateKind::Subtype(p) => {