fixed SD2-445 C# parser fails on default value expression in variable initializer

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@559 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/NRefactory/Project/Src/Parser/CSharp/cs.ATG

@@ -1663,6 +1663,8 @@ VariableInitializer<out Expression initializerExpression>
 	Expr<out initializerExpression>
 	| ArrayInitializer<out initializerExpression>
 	| "stackalloc" Type<out type> "[" Expr<out expr> "]" (. initializerExpression = new StackAllocExpression(type, expr); .)
+	| /* workaround for coco bug? doesn't work in Expr production in this case. */
+	  "default" "(" Type<out type> ")" (. initializerExpression = new DefaultValueExpression(type); .)
 .
 
 OverloadableOperator<out OverloadableOperatorType op>