Cannot make an array of an enum variant if a different variant may contain a non-copy type

[Gankra]

Canonical example [None, ..10] doesn't work for a generic [Option<T>, ..10]. It's possible to write a macro to accomplish this, but it sucks that that's necessary.

[japaric]

I think this is a duplicate of #5244

[alexcrichton]

Aha, it is indeed, thanks @japaric!