// it is a documentation pseudo-command such as importpath.
func (c *Command) Runnable() bool {
	return c.Run != nil
}

var atExitFuncs []func()

func AtExit(f func()) {
	atExitFuncs = append(atExitFuncs, f)
}

func Exit() {
	for _, f := range atExitFuncs {
		f()
	}
	os.Exit(exitStatus)
}

func Fatalf(format string, args ...any) {

	MOVQ	wait+0(FP), AX
	// We're done using the stack.
	MOVL	$0, (AX)
	MOVL	$0x10000, DI	// arg 1 how - EXTEXIT_LWP
	MOVL	$0, SI		// arg 2 status
	MOVL	$0, DX		// arg 3 addr
	MOVL	$494, AX	// extexit
	SYSCALL
	MOVL	$0xf1, 0xf1  // crash
	JMP	0(PC)

TEXT runtime·open(SB),NOSPLIT,$-8
	MOVQ	name+0(FP), DI		// arg 1 pathname
	MOVL	mode+8(FP), SI		// arg 2 flags
	MOVL	perm+12(FP), DX		// arg 3 mode
	MOVL	$5, AX