mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

EvaluateToAmbig if evaluate_root_obligation does inference

Browse Source
This commit is contained in:
Michael Goulet 2023-04-09 01:10:47 +00:00
parent 077fc26f0a
commit dbbb42442c
1 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
compiler/rustc_trait_selection/src/traits/select/mod.rs
View File

@ -537,14 +537,21 @@ pub fn evaluate_root_obligation(
obligation: &PredicateObligation<'tcx>,
) -> Result<EvaluationResult, OverflowError> {
self.evaluation_probe(|this| {
if this.tcx().trait_solver_next() {
this.evaluate_predicates_recursively_in_new_solver([obligation.clone()])
let goal = infcx.resolve_vars_if_possible((obligation.predicate, obligation.param_env));
let mut result = if this.tcx().trait_solver_next() {
this.evaluate_predicates_recursively_in_new_solver([obligation.clone()])?
} else {
this.evaluate_predicate_recursively(
TraitObligationStackList::empty(&ProvisionalEvaluationCache::default()),
obligation.clone(),
)
)?
};
// If the predicate has done any inference, then downgrade the
// result to ambiguous.
if this.infcx.shallow_resolve(goal) != goal {
result = result.max(EvaluatedToAmbig);
}
Ok(result)
})
}