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Retry pred_known_to_hold_modulo_regions with fulfillment if ambiguous #108754

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Mar 9, 2023
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Retry pred_known_to_hold_modulo_regions with fulfillment if ambiguous #108754

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8 changes: 5 additions & 3 deletions compiler/rustc_trait_selection/src/traits/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -155,10 +155,12 @@ fn pred_known_to_hold_modulo_regions<'tcx>(
predicate: pred.to_predicate(infcx.tcx),
};

let result = infcx.predicate_must_hold_modulo_regions(&obligation);
let result = infcx.evaluate_obligation_no_overflow(&obligation);
debug!(?result);

if result && has_non_region_infer {
if result.must_apply_modulo_regions() && !has_non_region_infer {
true
} else if result.may_apply() {
// Because of inference "guessing", selection can sometimes claim
// to succeed while the success requires a guess. To ensure
// this function's result remains infallible, we must confirm
Expand All @@ -179,7 +181,7 @@ fn pred_known_to_hold_modulo_regions<'tcx>(
}
}
} else {
result
false
}
}

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