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Rollup merge of #89823 - jackh726:project-overflow, r=oli-obk

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Switch order of terms to prevent overflow

Fixes #89639

r? ``@pnkfelix``
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Matthias Krüger 2021-10-14 16:06:45 +02:00 committed by GitHub
commit 29081f95e9
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compiler/rustc_trait_selection/src/traits/project.rs
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@ -558,7 +558,7 @@ impl<'me, 'tcx> BoundVarReplacer<'me, 'tcx> {
fn universe_for(&mut self, debruijn: ty::DebruijnIndex) -> ty::UniverseIndex {
let infcx = self.infcx;
let index =
self.universe_indices.len() - debruijn.as_usize() + self.current_index.as_usize() - 1;
self.universe_indices.len() + self.current_index.as_usize() - debruijn.as_usize() - 1;
let universe = self.universe_indices[index].unwrap_or_else(|| {
for i in self.universe_indices.iter_mut().take(index + 1) {
*i = i.or_else(|| Some(infcx.create_next_universe()))