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diff --git a/third_party/wasm2c/include/wabt/result.h b/third_party/wasm2c/include/wabt/result.h
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+/*
+ * Copyright 2017 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 WABT_RESULT_H_
+#define WABT_RESULT_H_
+
+namespace wabt {
+
+struct Result {
+ enum Enum {
+ Ok,
+ Error,
+ };
+
+ Result() : Result(Ok) {}
+ Result(Enum e) : enum_(e) {}
+ operator Enum() const { return enum_; }
+ Result& operator|=(Result rhs);
+
+ private:
+ Enum enum_;
+};
+
+inline Result operator|(Result lhs, Result rhs) {
+ return (lhs == Result::Error || rhs == Result::Error) ? Result::Error
+ : Result::Ok;
+}
+
+inline Result& Result::operator|=(Result rhs) {
+ enum_ = *this | rhs;
+ return *this;
+}
+
+inline bool Succeeded(Result result) {
+ return result == Result::Ok;
+}
+inline bool Failed(Result result) {
+ return result == Result::Error;
+}
+
+#define CHECK_RESULT(expr) \
+ do { \
+ if (Failed(expr)) { \
+ return ::wabt::Result::Error; \
+ } \
+ } while (0)
+
+} // namespace wabt
+
+#endif // WABT_RESULT_H_