2 files changed, 1 insertions, 60 deletions
diff --git a/compiler/rustc_mir/src/transform/check_consts/check.rs b/compiler/rustc_mir/src/transform/check_consts/check.rs
index cff386f776b..109da59aa43 100644
--- a/compiler/rustc_mir/src/transform/check_consts/check.rs
+++ b/compiler/rustc_mir/src/transform/check_consts/check.rs
@@ -748,12 +748,7 @@ impl Visitor<'tcx> for Checker<'mir, 'tcx> {
             | ProjectionElem::Downcast(..)
             | ProjectionElem::Subslice { .. }
             | ProjectionElem::Field(..)
-            | ProjectionElem::Index(_) => {
-                let base_ty = Place::ty_from(place_local, proj_base, self.body, self.tcx).ty;
-                if base_ty.is_union() {
-                    self.check_op(ops::UnionAccess);
-                }
-            }
+            | ProjectionElem::Index(_) => {}
         }
     }
 
@@ -876,15 +871,6 @@ impl Visitor<'tcx> for Checker<'mir, 'tcx> {
 
                 let is_intrinsic = tcx.fn_sig(callee).abi() == RustIntrinsic;
 
-                // HACK: This is to "unstabilize" the `transmute` intrinsic
-                // within const fns. `transmute` is allowed in all other const contexts.
-                // This won't really scale to more intrinsics or functions. Let's allow const
-                // transmutes in const fn before we add more hacks to this.
-                if is_intrinsic && tcx.item_name(callee) == sym::transmute {
-                    self.check_op(ops::Transmute);
-                    return;
-                }
-
                 if !tcx.is_const_fn_raw(callee) {
                     let mut permitted = false;
 
diff --git a/compiler/rustc_mir/src/transform/check_consts/ops.rs b/compiler/rustc_mir/src/transform/check_consts/ops.rs
index fd72ec4340f..8de11fda7d7 100644
--- a/compiler/rustc_mir/src/transform/check_consts/ops.rs
+++ b/compiler/rustc_mir/src/transform/check_consts/ops.rs
@@ -501,51 +501,6 @@ impl NonConstOp for ThreadLocalAccess {
     }
 }
 
-#[derive(Debug)]
-pub struct Transmute;
-impl NonConstOp for Transmute {
-    fn status_in_item(&self, ccx: &ConstCx<'_, '_>) -> Status {
-        if ccx.const_kind() != hir::ConstContext::ConstFn {
-            Status::Allowed
-        } else {
-            Status::Unstable(sym::const_fn_transmute)
-        }
-    }
-
-    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> DiagnosticBuilder<'tcx> {
-        let mut err = feature_err(
-            &ccx.tcx.sess.parse_sess,
-            sym::const_fn_transmute,
-            span,
-            &format!("`transmute` is not allowed in {}s", ccx.const_kind()),
-        );
-        err.note("`transmute` is only allowed in constants and statics for now");
-        err
-    }
-}
-
-#[derive(Debug)]
-pub struct UnionAccess;
-impl NonConstOp for UnionAccess {
-    fn status_in_item(&self, ccx: &ConstCx<'_, '_>) -> Status {
-        // Union accesses are stable in all contexts except `const fn`.
-        if ccx.const_kind() != hir::ConstContext::ConstFn {
-            Status::Allowed
-        } else {
-            Status::Unstable(sym::const_fn_union)
-        }
-    }
-
-    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> DiagnosticBuilder<'tcx> {
-        feature_err(
-            &ccx.tcx.sess.parse_sess,
-            sym::const_fn_union,
-            span,
-            "unions in const fn are unstable",
-        )
-    }
-}
-
 // Types that cannot appear in the signature or locals of a `const fn`.
 pub mod ty {
     use super::*;