mcs tuple grammer changes

gistfile1.txt

diff --git a/mcs/mcs/cs-parser.jay b/mcs/mcs/cs-parser.jay
index bb2bd6e..a41ae23 100644
--- a/mcs/mcs/cs-parser.jay
+++ b/mcs/mcs/cs-parser.jay
@@ -3222,6 +3222,20 @@ type_expression
 		$$ = new ComposedCast ((ATypeNameExpression) $1, (ComposedTypeSpecifier) $2);
 	  }
 	| builtin_type_expression
+	| tuple_type
+	;
+
+tuple_type
+	: OPEN_PARENS tuple_type_element_list CLOSE_PARENS { $$ = $2; }
+	;
+
+tuple_type_element_list
+	: tuple_type_element COMMA tuple_type_element
+	| tuple_type_element_list COMMA tuple_type_element
+	;
+
+tuple_type_element
+	: type opt_identifier {}
 	;
 
 void_invalid
@@ -3341,6 +3355,7 @@ literal
 	: boolean_literal
 	| LITERAL
 	| NULL			{ $$ = new NullLiteral (GetLocation ($1)); }
+	| tuple_literal
 	;
 
 boolean_literal
@@ -3348,6 +3363,20 @@ boolean_literal
 	| FALSE			{ $$ = new BoolLiteral (compiler.BuiltinTypes, false, GetLocation ($1)); }
 	;
 
+tuple_literal
+	: OPEN_PARENS tuple_literal_element_list CLOSE_PARENS
+	;
+
+tuple_literal_element_list
+	: tuple_literal_element COMMA tuple_literal_element
+	| tuple_literal_element_list COMMA tuple_literal_element
+	;
+
+tuple_literal_element
+	: IDENTIFIER SEMICOLON expression
+	| expression
+	;
+
 interpolated_string
 	: INTERPOLATED_STRING interpolations INTERPOLATED_STRING_END
 	  {
@@ -6483,6 +6512,11 @@ opt_identifier
 	| identifier_inside_body
 	;
 
+opt_identifier_semicolon
+	: /* empty */
+	| IDENTIFIER SEMICOLON { $$ = $1;}
+	;
+
 catch_clause 
 	: CATCH opt_catch_filter block
 	  {