tupleof on arrays?

[Yang Bo]

I have some string generate from template, and I need to dump them to
stack and modify it. So I write:

template S(int n) {
  const char[] S = "n = " ~ n;
}
void f() {
  char[S!(123).length] s = [S!(0).tupleof];
  s[0] = 'm';
}

The problem is, there is not a 'tupleof' property on array. Should this
feature be buildin ?