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exhaustive match on implied bounds regions

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This commit is contained in:
Ali MJ Al-Nasrawy 2023-03-09 11:30:49 +03:00
parent 183bd97d07
commit 211fa45d18
1 changed files with 8 additions and 15 deletions
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23
compiler/rustc_infer/src/infer/outlives/env.rs
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@ -136,21 +136,14 @@ fn add_outlives_bounds<I>(&mut self, outlives_bounds: I)
self.region_bound_pairs
.insert(ty::OutlivesPredicate(GenericKind::Alias(alias_b), r_a));
}
OutlivesBound::RegionSubRegion(r_a, r_b) => {
// In principle, we could record (and take
// advantage of) every relationship here, but
// we are also free not to -- it simply means
// strictly less that we can successfully type
// check. Right now we only look for things
// relationships between free regions. (It may
// also be that we should revise our inference
// system to be more general and to make use
// of *every* relationship that arises here,
// but presently we do not.)
if r_a.is_free_or_static() && r_b.is_free() {
self.region_relation.add(r_a, r_b)
}
}
OutlivesBound::RegionSubRegion(r_a, r_b) => match (*r_a, *r_b) {
(
ty::ReStatic | ty::ReEarlyBound(_) | ty::ReFree(_),
ty::ReStatic | ty::ReEarlyBound(_) | ty::ReFree(_),
) => self.region_relation.add(r_a, r_b),
(ty::ReError(_), _) | (_, ty::ReError(_)) => {}
_ => bug!("add_outlives_bounds: unexpected regions"),
},
}
}
}