A couple of days ago, some of my Rust CI builds started failing because `rustpkg` is having trouble finding `std` and `extra`. Here are a couple of failed builds: - https://travis-ci.org/eholk/rust-opencl/builds/17491630 - https://travis-ci.org/eholk/SciRust/builds/17491313