Don't lint non-extern-prelude extern crate's in Rust 2018.#54650

Merged

bors merged 2 commits intorust-lang:masterfrom eddyb:no-extern's-land

Oct 1, 2018

+59-110

Commits on Sep 28, 2018

rustc_resolve: move extern_prelude from Resolver to Session.
eddyb
committed
rustc_typeck: don't lint non-extern-prelude extern crate's in Rust 2018.
eddyb
committed