int fnA() { return (int)0.5); }
int fnB() { return (5+5)); }
array<int>> arr;

The above code compiles fine, even though it has missmatched brackets everywhere. Seems to be only not handled if used within a return statement, or template instantiation (third line). If used anywhere else (as far as i'm aware of), e.g.,

int a = (5+5));

an error is generated with "Invalid statement ')'".