rustup override

Modify directory toolchain overrides. See rustup help toolchain for more information about toolchains. More information: https://rust-lang.github.io/rustup.

• List directiory toolchain overrides:
  rustup override list
• Set the override toolchain for the current directory (i.e. tell rustup to run cargo, rustc, etc. from a specific toolchain when in that directory):
  rustup override set {{toolchain}}
• Remove the toolchain override for the current directory:
  rustup override unset
• Remove all toolchain overrides for directories that no longer exist:
  rustup override unset --nonexistent