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diff --git a/include/toy/MLIRGen.h b/include/toy/MLIRGen.h
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+//===- MLIRGen.h - MLIR Generation from a Toy AST -------------------------===//
+//
+// Copyright 2019 The MLIR Authors.
+//
+// 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.
+// =============================================================================
+//
+// This file declares a simple interface to perform IR generation targeting MLIR
+// from a Module AST for the Toy language.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_TUTORIAL_TOY_MLIRGEN_H_
+#define MLIR_TUTORIAL_TOY_MLIRGEN_H_
+
+#include <memory>
+
+namespace mlir {
+class MLIRContext;
+class Module;
+} // namespace mlir
+
+namespace toy {
+class ModuleAST;
+
+/// Emit IR for the given Toy moduleAST, returns a newly created MLIR module
+/// or nullptr on failure.
+std::unique_ptr<mlir::Module> mlirGen(mlir::MLIRContext &context,
+                                      ModuleAST &moduleAST);
+} // namespace toy
+
+#endif // MLIR_TUTORIAL_TOY_MLIRGEN_H_