After I apply mix fix for legacy/trac#24642, I see this message in test-suite.log from test_rust.sh: ``` Doc-tests protover error[E0463]: can't find crate for `libc` --> /Users/nickm/src/tor/src/rust/protover/lib.rs:25:1 | 25 | extern crate libc; | ^^^^^^^^^^^^^^^^^^ can't find crate ``` I do not see the same message on my linux rust builds.