diff options
Diffstat (limited to 'compiler/rustc_infer/src/infer/sub.rs')
| -rw-r--r-- | compiler/rustc_infer/src/infer/sub.rs | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/compiler/rustc_infer/src/infer/sub.rs b/compiler/rustc_infer/src/infer/sub.rs index 27e1ed56f..0c3bb633b 100644 --- a/compiler/rustc_infer/src/infer/sub.rs +++ b/compiler/rustc_infer/src/infer/sub.rs @@ -147,25 +147,6 @@ impl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx> { ); Ok(a) } - // Optimization of GeneratorWitness relation since we know that all - // free regions are replaced with bound regions during construction. - // This greatly speeds up subtyping of GeneratorWitness. - (&ty::GeneratorWitness(a_types), &ty::GeneratorWitness(b_types)) => { - let a_types = infcx.tcx.anonymize_bound_vars(a_types); - let b_types = infcx.tcx.anonymize_bound_vars(b_types); - if a_types.bound_vars() == b_types.bound_vars() { - let (a_types, b_types) = infcx.instantiate_binder_with_placeholders( - a_types.map_bound(|a_types| (a_types, b_types.skip_binder())), - ); - for (a, b) in std::iter::zip(a_types, b_types) { - self.relate(a, b)?; - } - Ok(a) - } else { - Err(ty::error::TypeError::Sorts(ty::relate::expected_found(self, a, b))) - } - } - _ => { self.fields.infcx.super_combine_tys(self, a, b)?; Ok(a) |