[Issue 20123] Impossible to disable post-increment/decrement semantics

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20123

--- Comment #1 from Manu <turkeyman at gmail.com> ---
Or a way to @disable the post-inc/dec semantics explicitly, so that I can
implement pre-inc/dec without opening the door for a race on the lowering.

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