[Issue 21460] implicit conversion between two unrelated enum is accepted

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21460

--- Comment #2 from Basile-z <b2.temp at gmx.com> ---
might be fixed by a revival of https://github.com/dlang/dmd/pull/10603.
Not sure, it can be only be related, e.g another side effect of the premature
promotion of the condition.

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