fixed http://community.sharpdevelop.net/forums/t/11681.aspx

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@6406 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/NRefactory/Project/Src/Lexer/CSharp/Lexer.cs

@@ -166,6 +166,8 @@ namespace ICSharpCode.NRefactory.Parser.CSharp
 				}
 				
 				if (curPos < MAX_IDENTIFIER_LENGTH) {
+					if (ch != '\0') // only add character, if it is valid
+									 // prevents \ from being added
 						identBuffer[curPos++] = ch;
 				} else {
 					errors.Error(Line, Col, String.Format("Identifier too long"));