[Issue 24838] @nogc lambda shouldn't allocate closure when lambda refers only to 'this'

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24838

--- Comment #4 from Manu <turkeyman at gmail.com> ---
Correct, all code will benefit.
I just made the point because it's just particularly important for @nogc code,
where it is currently impossible to implement event-based systems conveniently.

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