[Issue 23835] Accessing variable outside nested function creates delegate even if it is static

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23835

--- Comment #2 from Richard Cattermole <alphaglosined at gmail.com> ---
Yeah I went with ``typeof(builder).perform;`` since the real thing is templated
non-trivially.

Not ideal for example code though (which is what triggered this).

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