fd = uintptr(fd2)
	}
	if prev := runtime_setCrashFD(fd); prev != ^uintptr(0) {
		// We use NewFile+Close because it is portable
		// unlike syscall.Close, whose parameter type varies.
		os.NewFile(prev, "").Close() // ignore error
	}
	return nil
}

//go:linkname runtime_setCrashFD runtime.setCrashFD