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do not ICE in fn forced_ambiguity if we get an error #123477

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Apr 5, 2024
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do not ICE in fn forced_ambiguity if we get an error #123477

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13 changes: 10 additions & 3 deletions compiler/rustc_trait_selection/src/solve/assembly/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -312,11 +312,18 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
fn forced_ambiguity(&mut self, cause: MaybeCause) -> Vec<Candidate<'tcx>> {
let source = CandidateSource::BuiltinImpl(BuiltinImplSource::Misc);
let certainty = Certainty::Maybe(cause);
let result = self.evaluate_added_goals_and_make_canonical_response(certainty).unwrap();
// This may fail if `try_evaluate_added_goals` overflows because it
// fails to reach a fixpoint but ends up getting an error after
// running for some additional step.
//
// FIXME: Add a test for this. It seems to be necessary for typenum but
// is incredibly hard to minimize as it may rely on being inside of a
// trait solver cycle.
let result = self.evaluate_added_goals_and_make_canonical_response(certainty);
let mut dummy_probe = self.inspect.new_probe();
dummy_probe.probe_kind(ProbeKind::TraitCandidate { source, result: Ok(result) });
dummy_probe.probe_kind(ProbeKind::TraitCandidate { source, result });
self.inspect.finish_probe(dummy_probe);
vec![Candidate { source, result }]
if let Ok(result) = result { vec![Candidate { source, result }] } else { vec![] }
}

#[instrument(level = "debug", skip_all)]
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