src/librustc/lib.rs
52:pub extern crate rustc_llvm as llvm;

src/librustc_trans/lib.rs
49:pub extern crate rustc_llvm as llvm;

src/libstd/sys/unix/net.rs
24:pub extern crate libc as netc;

src/test/auxiliary/privacy_reexport.rs
11:pub extern crate core;

src/test/rustdoc/issue-27104.rs
19:// @has - 'pub extern crate empty'
20:pub extern crate empty;