[Issue 21445] Indexing a tuple in a static array type suffix fails to compile

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21445

--- Comment #1 from Max Samukha <maxsamukha at gmail.com> ---
Independent test:

template alias_(a...) {
    alias alias_ = a;
}

struct S {
    int[] a;
    alias fields = alias_!(S.tupleof);
    alias fields this;
}

enum s = S(new int[1]);
int[s[0].length] a;

void main() {
}

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