[Issue 12486] Function returning struct isn't called if `enum` of its result is accessed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12486

--- Comment #4 from FeepingCreature <default_357-line at yahoo.de> ---
Posted a pull request that's awaiting review:
https://github.com/dlang/dmd/pull/8013

I'm not really happy with it, but I don't know a better way to write it.

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