[Issue 15065] associative array has no keys property

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15065

--- Comment #1 from Kenji Hara <k.hara.pg at gmail.com> ---
Reduced test case:

template partial(alias arg) {}

struct X(int[int] x)
{
    alias w = partial!(x.keys);
}

X!([1:2]) zzz;

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