Hi all,
I am trying to implement `opIndex` (e.g. T[i]) for types in a
struct. So for I have `length`:
```d
struct TList(T...)
{
enum long length = T.length;
}
```
and have tried including
```d
alias opIndex(long i) = T[i];
```
or
```d
alias opIndex(alias i) = T[i];
```
called with
```d
alias tList = AliasSeq!(bool, string, ubyte, short, ushort);
TList!(tList)[0];
```
but that doesn't work and I get the error:
```d
opIndex cannot deduce function from argument types !()(int),
candidates are:
opIndex(long i)
```
