diff options
Diffstat (limited to 'compiler')
| -rw-r--r-- | compiler/rustc_infer/src/infer/outlives/env.rs | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/compiler/rustc_infer/src/infer/outlives/env.rs b/compiler/rustc_infer/src/infer/outlives/env.rs index 95f8f05ab60..a480ee5429e 100644 --- a/compiler/rustc_infer/src/infer/outlives/env.rs +++ b/compiler/rustc_infer/src/infer/outlives/env.rs @@ -136,21 +136,14 @@ impl<'tcx> OutlivesEnvironmentBuilder<'tcx> { 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"), + }, } } } |