[Issue 23923] `this` not captured by lazy expression

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23923

--- Comment #1 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
(In reply to Vladimir Panteleev from comment #0)
> so the implicit reference to `this` (or other locals) would not be allowed.

so escaping the lazy expression in lazyFun would not be allowed.*

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