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diff --git a/clang-r344140b/include/clang/Basic/PrettyStackTrace.h b/clang-r344140b/include/clang/Basic/PrettyStackTrace.h
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+++ b/clang-r344140b/include/clang/Basic/PrettyStackTrace.h
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+//===- clang/Basic/PrettyStackTrace.h - Pretty Crash Handling --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Defines the PrettyStackTraceEntry class, which is used to make
+/// crashes give more contextual information about what the program was doing
+/// when it crashed.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_PRETTYSTACKTRACE_H
+#define LLVM_CLANG_BASIC_PRETTYSTACKTRACE_H
+
+#include "clang/Basic/SourceLocation.h"
+#include "llvm/Support/PrettyStackTrace.h"
+
+namespace clang {
+
+  /// If a crash happens while one of these objects are live, the message
+  /// is printed out along with the specified source location.
+  class PrettyStackTraceLoc : public llvm::PrettyStackTraceEntry {
+    SourceManager &SM;
+    SourceLocation Loc;
+    const char *Message;
+  public:
+    PrettyStackTraceLoc(SourceManager &sm, SourceLocation L, const char *Msg)
+      : SM(sm), Loc(L), Message(Msg) {}
+    void print(raw_ostream &OS) const override;
+  };
+}
+
+#endif