[Issue 16037] assigning delegate to a scope variable shouldn't allocate closure

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16037

--- Comment #8 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Anyway, if `in` loses scope semantics, it will break @nogc code like in the
example above, you can't eliminate breakage completely here.

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