Remove workaround for CastKind::Transmute from const prop

Since constants are no longer validated before propagation the
workaround is obsolete. Remove it.

1 files changed, 0 insertions, 10 deletions

diff --git a/compiler/rustc_mir_transform/src/const_prop.rs b/compiler/rustc_mir_transform/src/const_prop.rs
index c4e715ccca8..7ac8ffb4955 100644
--- a/compiler/rustc_mir_transform/src/const_prop.rs
+++ b/compiler/rustc_mir_transform/src/const_prop.rs
@@ -501,16 +501,6 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
 
                 return None;
             }
-            // Do not try creating references, nor any types with potentially-complex
-            // invariants. This avoids an issue where checking validity would do a
-            // bunch of work generating a nice message about the invariant violation,
-            // only to not show it to anyone (since this isn't the lint).
-            Rvalue::Cast(CastKind::Transmute, op, dst_ty) if !dst_ty.is_primitive() => {
-                trace!("skipping Transmute of {:?} to {:?}", op, dst_ty);
-
-                return None;
-            }
-
             // There's no other checking to do at this time.
             Rvalue::Aggregate(..)
             | Rvalue::Use(..)