1 files changed, 4 insertions, 1 deletions
diff --git a/compiler/rustc_mir_transform/src/match_branches.rs b/compiler/rustc_mir_transform/src/match_branches.rs
index 4d9a198eeb2..d68f8a995d8 100644
--- a/compiler/rustc_mir_transform/src/match_branches.rs
+++ b/compiler/rustc_mir_transform/src/match_branches.rs
@@ -41,7 +41,10 @@ impl<'tcx> MirPass<'tcx> for MatchBranchSimplification {
                 should_cleanup = true;
                 continue;
             }
-            if SimplifyToExp::default().simplify(tcx, body, bb_idx, param_env).is_some() {
+            // unsound: https://github.com/rust-lang/rust/issues/124150
+            if tcx.sess.opts.unstable_opts.unsound_mir_opts
+                && SimplifyToExp::default().simplify(tcx, body, bb_idx, param_env).is_some()
+            {
                 should_cleanup = true;
                 continue;
             }