fix mixin-type variable declarations, fix #496

Author: WebFreak001

src/dparse/parser.d

@@ -2410,8 +2410,7 @@ class Parser
                     else
                     {
                         goToBookmark(b);
-                        error("Declaration expected");
-                        return null;
+                        goto type;
                     }
                 }
                 else

test/pass_files/mixin_types.d

@@ -0,0 +1,7 @@
+mixin("int") variableName;
+void foo(mixin("int") arg) {
+	mixin("int") localVar;
+}
+struct S {
+	mixin("int") foo;
+}