1 files changed, 1 insertions, 1 deletions
diff --git a/src/passes/RemoveUnusedNames.cpp b/src/passes/RemoveUnusedNames.cpp
index 3b04522ad..1cd974704 100644
--- a/src/passes/RemoveUnusedNames.cpp
+++ b/src/passes/RemoveUnusedNames.cpp
@@ -80,7 +80,7 @@ struct RemoveUnusedNames : public WalkerPass<PostWalker<RemoveUnusedNames>> {
               br->name = child->name;
             }
           } else {
-            WASM_UNREACHABLE();
+            WASM_UNREACHABLE("unexpected expr type");
           }
         }
         child->finalize(child->type);