4444 – Cannot index built-in array with expression tuple

Expression tuples cannot be used for indexing built-in arrays:
--------------------
import std.typetuple;
void main()
{
 alias TypeTuple!(1) index;
 auto arr = new int[4];
 auto x = arr[index]; // error
}
--------------------
% dmd -o- -c test
test.d(6): Error: cannot implicitly convert expression (tuple(1)) of type (int) to uint
--------------------
While overloaded opIndex accepts expression tuple.
--------------------
import std.typetuple;
void main()
{
 alias TypeTuple!(1) index;
 S s;
 auto x = s[index]; // okay
}
struct S
{
 size_t opIndex(size_t i) { return i; }
}
--------------------

https://github.com/D-Programming-Language/dmd/pull/105 

https://github.com/9rnsr/dmd/commit/0238f964842a736b87a6db1af4f60f6ef23ebdb1
https://github.com/D-Programming-Language/dmd/commit/f246e65e03c5e2102d92b176550e3fb28ef65d15
https://github.com/D-Programming-Language/dmd/commit/5b542c0332fd0ac803c7592b09c0d1bd9c2a512d