If one wants to use rustup to install old stable releases for some reason, they need to find the right date to use. For instance rustup toolchain install stable-2017-06-08 for 1.18. This is tedious. It would be easier if it were possible to say rustup toolchain install stable-1.18.0
rustup toolchain install 1.18.0
facepalm
Thanks.
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rustup toolchain install 1.18.0