Restriction, no import of associated items, is not documented

[ijackson]

Hi. I was using a crate which had a struct with a number of associated items and I was trying to save typing in an error handling function. But:

12 |     use rocket::http::Status::*;
   |                       ^^^^^^ `Status` is a struct, not a module

I looked in the Reference and I wasn't able to find any discussion of this. In particular, I would expect it to be documented in the explanation of Use declarations under Items.

After considerably more digging, I found:

• associated constants can't be used rust#24915, a closed issue where the resolution was that this is not expected to work
• https://internals.rust-lang.org/t/importing-associated-constants/6610/5, a discussion about how to maybe implement this (although it seems unlikely that that approach could work for the glob import I was trying...)

It would be nice if this restriction were documented. See also rust-lang/rust#74030 where I suggest that a better error message would be nice. Thanks.