[Issue 23112] code passes @nogc, allocates anyway

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23112

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---
A simpler version of this is filed as
https://issues.dlang.org/show_bug.cgi?id=23160 which should be fixed first.

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