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eval_outlives: bail out early if both regions are in the same SCC #137216

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Merged
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Feb 19, 2025
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eval_outlives: bail out early if both regions are in the same SCC #137216

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5 changes: 5 additions & 0 deletions compiler/rustc_borrowck/src/region_infer/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1267,6 +1267,11 @@ impl<'tcx> RegionInferenceContext<'tcx> {
let sub_region_scc = self.constraint_sccs.scc(sub_region);
let sup_region_scc = self.constraint_sccs.scc(sup_region);

if sub_region_scc == sup_region_scc {
debug!("{sup_region:?}: {sub_region:?} holds trivially; they are in the same SCC");
return true;
}

// If we are checking that `'sup: 'sub`, and `'sub` contains
// some placeholder that `'sup` cannot name, then this is only
// true if `'sup` outlives static.
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