I would absolutely love rustc to gain the ability to rename stdlib types across edition boundaries (e.g. you create a Range2 type which is named Range in Rust 2

I would absolutely love rustc to gain the ability to rename stdlib types across edition boundaries (e.g. you create a Range2 type which is named Range in Rust 2024, or vice versa). I'm not super familiar with the compiler internals, but it seems to me that it shouldn't be all that hairy. One ought to be able to deal with this in a single pass at a very early stage in the compile process. Seems like this would be a great way to deal with deprecated stdlib functionality. Especially in the case that there is a better replacement available. Ranges and channels would be obvious candidates for this.