Consider documenting the split extern prelude

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
62/100
Issue type
Documentation
Clarity
Mostly clear
Activity status
Stale
Tech stack
rust
Domain
documentation

Research direction

Start with the extern prelude section in the Rust Reference and read linked PRs 144793 and 145961 to understand the behavior being discussed. Update the documentation to explain the split between items from extern crate and --extern, then verify that the section accurately reflects both sources.

Written by the indexing model from the issue text.

Description

A-resolve

https://github.com/rust-lang/rust/pull/144793 changed it so that the extern prelude is split in two. One for extern crate and one for --extern.

I'm wondering if this is something that should be documented. The existing extern prelude docs mention that it receives items from --extern and extern crate, but does not describe this new split behavior.

See also https://github.com/rust-lang/rust/pull/145961

Dominant language
Rust
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