Fixed unit test TestIdentifierContainingEscapeSequence.

ICSharpCode.NRefactory.Tests/CSharp/Parser/Expression/IdentifierExpressionTests.cs

@@ -33,7 +33,7 @@ namespace ICSharpCode.NRefactory.CSharp.Parser.Expression
 			CheckIdentifier(@"\u006cexer", "lexer");
 		}
 		
-		[Test, Ignore("Mono parser bug?")]
+		[Test]
 		public void TestIdentifierContainingEscapeSequence()
 		{
 			CheckIdentifier(@"l\U00000065xer", "lexer");

ICSharpCode.NRefactory/CSharp/Parser/mcs/cs-tokenizer.cs

@@ -2762,9 +2762,10 @@ namespace Mono.CSharp
 						if (c == '\\') {
 							int surrogate;
 							c = escape (c, out surrogate);
+							if (is_identifier_part_character ((char) c))
+								id_builder[pos++] = (char) c;
+
 							if (surrogate != 0) {
-								if (is_identifier_part_character ((char) c))
-									id_builder[pos++] = (char) c;
 								c = surrogate;
 							}