[Issue 23805] Runtime segmentation fault when destructor access function frame

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23805

--- Comment #1 from Mathias LANG <pro.mathias.lang at gmail.com> ---
As Steven Schveighoffer pointed out, this is because the context pointer is
`null`. So we should probably disable `.init` for nested structures, or find a
way to prevent this mistake.

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