diff options
| -rw-r--r-- | compiler/rustc_middle/src/ty/impls_ty.rs | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/compiler/rustc_middle/src/ty/impls_ty.rs b/compiler/rustc_middle/src/ty/impls_ty.rs index 54a345daec8..1dc7083c2a0 100644 --- a/compiler/rustc_middle/src/ty/impls_ty.rs +++ b/compiler/rustc_middle/src/ty/impls_ty.rs @@ -73,18 +73,16 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for ty::subst::GenericArgKin // // In order to make it very unlikely for the sequence of bytes being hashed for // a `GenericArgKind::Type` to be the same as the sequence of bytes being - // hashed for one of the other variants, we hash a `0xFF` byte before hashing - // their discriminant (since the discriminant of `TyKind` is unlikely to ever start - // with 0xFF). + // hashed for one of the other variants, we hash some very high number instead + // of their actual discriminant since `TyKind` should never start with anything + // that high. ty::subst::GenericArgKind::Type(ty) => ty.hash_stable(hcx, hasher), ty::subst::GenericArgKind::Const(ct) => { - 0xFFu8.hash_stable(hcx, hasher); - mem::discriminant(self).hash_stable(hcx, hasher); + 0xF3u8.hash_stable(hcx, hasher).hash_stable(hcx, hasher); ct.hash_stable(hcx, hasher); } ty::subst::GenericArgKind::Lifetime(lt) => { - 0xFFu8.hash_stable(hcx, hasher); - mem::discriminant(self).hash_stable(hcx, hasher); + 0xF5u8.hash_stable(hcx, hasher); lt.hash_stable(hcx, hasher); } } |