[Issue 24559] Compiler fails to error about using enum type as a value when compiling with -o-

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24559

--- Comment #2 from Luís Ferreira <contact at lsferreira.net> ---
Interesting enough, if you run `-verror=spec` with `-o-` it fails (enables
display of error gagging on speculative compilations).

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