1 files changed, 4 insertions, 0 deletions
diff --git a/src/wasm.h b/src/wasm.h
index 72ebe98ee..bccce50e5 100644
--- a/src/wasm.h
+++ b/src/wasm.h
@@ -1201,6 +1201,10 @@ struct WasmVisitor {
       case Expression::Id::HostId: DELEGATE(Host);
       case Expression::Id::NopId: DELEGATE(Nop);
       case Expression::Id::UnreachableId: DELEGATE(Unreachable);
+      default: {
+        std::cerr << "visiting unknown expression " << curr->_id << '\n';
+        abort();
+      }
     }
   }
 };