[Issue 24717] alias edge cases with tupleof

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24717

--- Comment #15 from Max Samukha <maxsamukha at gmail.com> ---
(In reply to Max Samukha from comment #14)

>         auto z = y; // `z` is resolved to `this.x`;

`y`, not `z`;

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