Function rustup_toolchain::is_installed

pub fn is_installed(toolchain: &str) -> Result<bool>

Check if a toolchain is installed.

As a workaround Rustup (including proxies) is not safe for concurrent use this function is protected by a process-global lock. If you use multiple processes, you need to prevent concurrent rustup usage yourself.

Errors

If rustup is not installed on your system, for example.