1 files changed, 8 insertions, 0 deletions
diff --git a/src/wasm/wasm.cpp b/src/wasm/wasm.cpp
index d4337a87d..d3b1c2151 100644
--- a/src/wasm/wasm.cpp
+++ b/src/wasm/wasm.cpp
@@ -1200,6 +1200,14 @@ void StringEncode::finalize() {
   }
 }
 
+void StringConcat::finalize() {
+  if (left->type == Type::unreachable || right->type == Type::unreachable) {
+    type = Type::unreachable;
+  } else {
+    type = Type(HeapType::string, NonNullable);
+  }
+}
+
 size_t Function::getNumParams() { return getParams().size(); }
 
 size_t Function::getNumVars() { return vars.size(); }