[Issue 21989] [REF 2.096] Double destruction of classes since `-preview=dtorfields` became the default

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21989

--- Comment #1 from Mathias LANG <pro.mathias.lang at gmail.com> ---
Bug found in a large application using Vibe.d:
https://github.com/vibe-d/vibe-core/issues/283

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