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Don't hang when there's an infinite loop of outlives obligations

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This commit is contained in:
Michael Goulet 2024-02-01 18:04:16 +00:00
parent 7d1fda7b40
commit a371059933
2 changed files with 87 additions and 62 deletions
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8
compiler/rustc_infer/src/infer/outlives/obligations.rs
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@ -154,12 +154,18 @@ impl<'tcx> InferCtxt<'tcx> {
.map_err(|e| (e, SubregionOrigin::AscribeUserTypeProvePredicate(DUMMY_SP)))?;
// Must loop since the process of normalizing may itself register region obligations.
loop {
for iteration in 0.. {
let my_region_obligations = self.take_registered_region_obligations();
if my_region_obligations.is_empty() {
break;
}
if !self.tcx.recursion_limit().value_within_limit(iteration) {
bug!(
"FIXME(-Znext-solver): Overflowed when processing region obligations: {my_region_obligations:#?}"
);
}
for RegionObligation { sup_type, sub_region, origin } in my_region_obligations {
let sup_type = deeply_normalize_ty(sup_type, origin.clone())
.map_err(|e| (e, origin.clone()))?;