[Issue 12884] implicit conversion wrongly prefers casting immutable away over alias this when target type is base class

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12884

--- Comment #1 from Nils <nilsbossung at googlemail.com> ---
https://github.com/D-Programming-Language/dmd/pull/3654

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