super doesn't work with use … as … syntax

[Twey]

Expected behaviour

I would expect super and self to behave the same as other module identifiers in all places.

Actual behaviour

It seems that super is not interpreted before the use … as … module-renaming syntax, resulting in an error about super being undefined:

https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=b06a2575fe28666b4298baa79816448b

[petrochenkov]

Duplicate of one of these - #37156, #35612, #29036.
Yeah, this should work, but the fix is low priority.