Tracking Issue for infallibly converting `ExitStatus` to `ExitCode`

Feature gate: #![feature(exitstatus_to_exitcode)]

This is a tracking issue for infallibly converting ExitStatus to ExitCode

Public API

// std::process
impl ExitCode {
    fn from_exit_status(status: ExitStatus) -> ExitCode;
}

impl ExitStatus {
    fn to_exit_code(&self) -> ExitCode
}

Steps / History

(Remember to update the S-tracking-* label when checking boxes.)

• ACP: https://github.com/rust-lang/libs-team/issues/729
• Implementation: #...
• Final comment period (FCP)^1
• Stabilization PR

Unresolved Questions

• Should this just be implemented via the From and Into traits? If there's one "obvious" conversion then it may make sense, even if it's not the only way to convert from ExitStatus to ExitCode.

Start with the tracking issue's std::process API sketch and the exitstatus_to_exitcode feature gate. Review ACP #729 and resolve the open question about From and Into traits before assessing implementation scope. Done requires implementation, a final comment period, and a stabilization PR, none of which is linked yet.