A struct with a tuple as alias this, is kind of confusing

[Yuxuan Shui]

On Friday, 27 July 2018 at 10:17:21 UTC, Yuxuan Shui wrote:
> First, it surprised me that I can't index a struct like that. 
> So:
>
> struct A(T...) {
>     alias S = T;
>     alias S this;
> }
>
> alias B = A!(int, double);
> B[0] x; // Actually an array
>
> Then, it surprised me again, that I actually can index it, 
> sometimes
>
> static if (!is(B[0] == B[1]))
>     pragma(msg, "Works!");
>
> Why is this language like this :(

Oh no, is it just defining arrays in the is() statement, though?

But wait, this works:

alias C = A!(1,2,3);
static if (C[0] < C[1])
    pragma(msg, "Ha!");