my company is working on a big rust project, and this project has a
rust-toolchain file which tells rustup which exact nightly version to use. Unfortunately, Travis downloads and install the
nightly Rust channel before rustup notices that we really need
nightly-2018-08-14 , so Rust is downloaded and installed twice. This is not only a waste of bandwidth, it currently also makes the builds noticeably slower.
I tried fixing this by setting
before_install , but that already seems to be too late.
any idea on how to fix this??