This is a sub-tracking issue for the RFC "Clarify and streamline paths and visibility" (rust-lang/rfcs#2126)
dealing with the deprecation of extern crate as well as having use crate_name::foo::bar and crate_name::foo::bar Just Work™.

• Implement the RFC.
  • The main blocker is that we don't yet have the macro changes finalized to make it possible to avoid needing #[macro_use] extern crate.
    • See Implement #[macro_export(local_inner_macros)] (a solution for the macro helper import problem) #51496
• Adjust documentation (see instructions on forge)
• Stabilization PR (see instructions on forge)

Unresolved questions:

None