1 files changed, 2 insertions, 2 deletions
diff --git a/include/clang/Lex/Lexer.h b/include/clang/Lex/Lexer.h
index 47a73fbd23..019153695a 100644
--- a/include/clang/Lex/Lexer.h
+++ b/include/clang/Lex/Lexer.h
@@ -25,6 +25,7 @@ namespace clang {
 class Diagnostic;
 class SourceManager;
 class Preprocessor;
+class DiagnosticInfo;
 
 /// Lexer - This provides a simple interface that turns a text buffer into a
 /// stream of tokens.  This provides no support for file reading or buffering,
@@ -171,8 +172,7 @@ public:
  
   /// Diag - Forwarding function for diagnostics.  This translate a source
   /// position in the current buffer into a SourceLocation object for rendering.
-  void Diag(const char *Loc, unsigned DiagID,
-            const std::string &Msg = std::string()) const;
+  DiagnosticInfo Diag(const char *Loc, unsigned DiagID) const;
 
   /// getSourceLocation - Return a source location identifier for the specified
   /// offset in the current file.