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diff --git a/src/ast_utils.h b/src/ast_utils.h
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+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef wasm_ast_utils_h
+#define wasm_ast_utils_h
+
+#include "wasm.h"
+
+namespace wasm {
+
+struct BreakSeeker : public WasmWalker<BreakSeeker> {
+  Name target; // look for this one
+  size_t found;
+
+  BreakSeeker(Name target) : target(target), found(false) {}
+
+  void visitBreak(Break *curr) {
+    if (curr->name == target) found++;
+  }
+
+  static bool has(Expression* tree, Name target) {
+    BreakSeeker breakSeeker(target);
+    breakSeeker.walk(tree);
+    return breakSeeker.found > 0;
+  }
+};
+
+} // namespace wasm
+
+#endif // wasm_ast_utils_h