Introduce negative import bounds for glob imports

language design
1

Hello, everyone

I have an idea to we introduce negative bounds only appear in glob imports example usage:

use std::marker::*!{Unpin};

This mean import me everything from std::marker excluding Unpin, This will be very useful in some situations.

2

Hmm... can you suggest a usecase for this? I'm not sure where it would be useful.

3

The usecase of this especially in exports by example you export everything to the crate except myprivfn and PrivateStruct.

pub use crate::mymod::*!{myprivfn, PrivateStruct};
4

I see. In that case, I don't think there would be that much of a problem in changing it (but I am not knowledgeable in these parts of the compiler) This does seem useful.