[Issue 17910] Can't have UFCS in aggregate types

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17910

--- Comment #2 from anonymous4 <dfj1esp02 at sneakemail.com> ---
This destroys encapsulation: what has no business at global scope shouldn't be
there.

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