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diff --git a/tools/libclang/CIndexDiagnostic.h b/tools/libclang/CIndexDiagnostic.h
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+++ b/tools/libclang/CIndexDiagnostic.h
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+/*===-- CIndexDiagnostic.h - Diagnostics C Interface ------------*- C++ -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file is distributed under the University of Illinois Open Source      *|
+|* License. See LICENSE.TXT for details.                                      *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* Implements the diagnostic functions of the Clang C interface.              *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+#ifndef LLVM_CLANG_CINDEX_DIAGNOSTIC_H
+#define LLVM_CLANG_CINDEX_DIAGNOSTIC_H
+
+struct CXUnsavedFile;
+
+namespace llvm {
+template<typename T> class SmallVectorImpl;
+namespace sys { class Path; }
+}
+
+namespace clang {
+
+class Diagnostic;
+class FileManager;
+class LangOptions;
+class Preprocessor;
+class StoredDiagnostic;
+class SourceManager;
+
+/// \brief The storage behind a CXDiagnostic
+struct CXStoredDiagnostic {
+  const StoredDiagnostic &Diag;
+  const LangOptions &LangOpts;
+  
+  CXStoredDiagnostic(const StoredDiagnostic &Diag,
+                     const LangOptions &LangOpts)
+    : Diag(Diag), LangOpts(LangOpts) { }
+};
+  
+/// \brief Given the path to a file that contains binary, serialized
+/// diagnostics produced by Clang, load those diagnostics.
+void LoadSerializedDiagnostics(const llvm::sys::Path &DiagnosticsPath,
+                               unsigned num_unsaved_files,
+                               struct CXUnsavedFile *unsaved_files,
+                               FileManager &FileMgr,
+                               SourceManager &SourceMgr,
+                               llvm::SmallVectorImpl<StoredDiagnostic> &Diags);
+
+} // end namespace clang
+
+#endif // LLVM_CLANG_CINDEX_DIAGNOSTIC_H