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

[d-bugmail at puremagic.com]

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

--- Comment #3 from Steven Schveighoffer <schveiguy at yahoo.com> ---
You have a choice, make your extension methods global, or don't use UFCS to
call them:

clear(b);

This is a perfectly reasonable tradeoff. D usually frowns upon having the same
code mean different things in different contexts. UFCS already pushes that
envelope, we don't need to push it more.

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