Install, manage, and update Rust toolchains. Some subcommands, such as toolchain, target, update, etc. have their own usage documentation. More information: <https://rust-lang.github.io/rustup>.

• Install the nightly toolchain for your system:
  rustup install nightly
• Switch the default toolchain to nightly so that the `cargo` and `rustc` commands will use it:
  rustup default nightly
• Use the nightly toolchain when inside the current project but leave global settings unchanged:
  rustup override set nightly
• Update all toolchains:
  rustup update
• List installed toolchains:
  rustup show
• Run `cargo build` with a certain toolchain:
  rustup run toolchain cargo build
• Open the local Rust documentation in the default web browser:
  rustup doc

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