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diff --git a/lib/AST/Interp/ByteCodeGenError.h b/lib/AST/Interp/ByteCodeGenError.h
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+//===--- ByteCodeGenError.h - Byte code generation error ----------*- C -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_INTERP_BYTECODEGENERROR_H
+#define LLVM_CLANG_AST_INTERP_BYTECODEGENERROR_H
+
+#include "clang/AST/Decl.h"
+#include "clang/AST/Stmt.h"
+#include "clang/Basic/SourceLocation.h"
+#include "llvm/Support/Error.h"
+
+namespace clang {
+namespace interp {
+
+/// Error thrown by the compiler.
+struct ByteCodeGenError : public llvm::ErrorInfo<ByteCodeGenError> {
+public:
+ ByteCodeGenError(SourceLocation Loc) : Loc(Loc) {}
+ ByteCodeGenError(const Stmt *S) : ByteCodeGenError(S->getBeginLoc()) {}
+ ByteCodeGenError(const Decl *D) : ByteCodeGenError(D->getBeginLoc()) {}
+
+ void log(raw_ostream &OS) const override { OS << "unimplemented feature"; }
+
+ const SourceLocation &getLoc() const { return Loc; }
+
+ static char ID;
+
+private:
+ // Start of the item where the error occurred.
+ SourceLocation Loc;
+
+ // Users are not expected to use error_code.
+ std::error_code convertToErrorCode() const override {
+ return llvm::inconvertibleErrorCode();
+ }
+};
+
+} // namespace interp
+} // namespace clang
+
+#endif