[Issue 18578] First enum value assigned 0 instead of EnumBaseType.init

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18578

--- Comment #2 from Jonathan Marler <johnnymarler at gmail.com> ---
Also noticed this one: https://github.com/dlang/dmd/pull/7996/files

I think @LemonBoy created this PR without knowing that I had made a bug for
this issue.

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