[Issue 19092] __delete doesn't work with immutable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19092

--- Comment #3 from Seb <greeenify at gmail.com> ---
An attempt at fixing __delete - https://github.com/dlang/druntime/pull/2253

@JinShil: I agree but unfortunately for a seamless deprecation of delete,
__delete must be a full drop-in replacement.

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