As a heads up, looks like a regression snuck into Cargo’s nightly last night which is preventing the regex crate from compiling with an error like:

error: unable to get packages from source Caused by: failed to parse manifest at `/home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-0.1.73/Cargo.toml` Caused by: duplicate build target found: `/home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-0.1.73/src/lib.rs`