rustdocs: missing items in reexported modules

[SimonSapin]

std::fmt is reexported as:

pub use core_collections::fmt;

This didn’t used to be a problem, http://doc.rust-lang.org/1.4.0/std/fmt/#structs documents a bunch of things. But most of it went missing: http://doc.rust-lang.org/nightly/std/fmt/#structs. (Note that URLs are for 1.4 and current nightly.)

CC @alexcrichton

[petrochenkov]

The main suspect is probably #29822, I'll look at what happens.

[alexcrichton]

Thanks for investigating @petrochenkov!

[petrochenkov]

Ha, it's not #29822, it's #30043.
cc @arielb1

[mitaa]

Fixed by #30870

[alexcrichton]

Thanks @mitaa!