fn try_from()

in reverie-ptrace/src/trace/mod.rs [394:426]
28 lines of code
2 McCabe index (conditional complexity)

    fn try_from(wait_status: WaitStatus) -> Result<Self, Error> {
        Ok(match wait_status {
            WaitStatus::Exited(pid, code) => Self::Exited(pid.into(), ExitStatus::Exited(code)),
            WaitStatus::Signaled(pid, sig, coredump) => {
                Self::Exited(pid.into(), ExitStatus::Signaled(sig, coredump))
            }
            WaitStatus::Stopped(pid, sig) => {
                let event = Event::Signal(sig);
                Self::Stopped(Stopped(pid.into()), event)
            }
            WaitStatus::PtraceEvent(pid, sig, event) => {
                // PTRACE_EVENT_STOP is not guaranteed to return the correct
                // signal, so we ignore it here.
                debug_assert!(event == libc::PTRACE_EVENT_STOP || sig == Signal::SIGTRAP);
                let task = Stopped(pid.into());
                let event = Event::from_ptrace_event(&task, event)?;
                Self::Stopped(task, event)
            }
            WaitStatus::PtraceSyscall(pid) => {
                let event = Event::Syscall;
                Self::Stopped(Stopped(pid.into()), event)
            }
            WaitStatus::Continued(_pid) => {
                // Not possible because we aren't using WaitPidFlag::WCONTINUED
                // anywhere.
                unreachable!("unexpected WaitStatus::Continued");
            }
            WaitStatus::StillAlive => {
                // The precondition of this function forbids this.
                unreachable!("precondition violated with WaitStatus::StillAlive");
            }
        })
    }