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expose evaluate_obligation that captures overflow, use in rustdoc

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This commit is contained in:
Niko Matsakis 2018-09-13 14:59:01 -04:00
parent f58f2c8efa
commit 2fd5516272
2 changed files with 30 additions and 12 deletions
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19
src/librustdoc/clean/blanket_impl.rs
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@ -103,11 +103,20 @@ impl<'a, 'tcx, 'rcx, 'cstore> BlanketImplFinder <'a, 'tcx, 'rcx, 'cstore> {
// FIXME(eddyb) ignoring `obligations` might cause false positives.
drop(obligations);
let may_apply = infcx.predicate_may_hold(&traits::Obligation::new(
cause.clone(),
param_env,
trait_ref.to_predicate(),
));
debug!(
"invoking predicate_may_hold: {:?}",
trait_ref,
);
let may_apply = match infcx.evaluate_obligation(
&traits::Obligation::new(
cause.clone(),
param_env,
trait_ref.to_predicate(),
),
) {
Ok(eval_result) => eval_result.may_apply(),
Err(traits::OverflowError) => true, // overflow doesn't mean yes *or* no
};
if !may_apply {
return
}