// If SetCrashOutput(f) was called, it also writes to f.
//
//go:nosplit
func writeErrStr(s string) {
	writeErrData(unsafe.StringData(s), int32(len(s)))
}

// writeErrData is the common parts of writeErr{,Str}.
//
//go:nosplit
func writeErrData(data *byte, n int32) {
	write(2, unsafe.Pointer(data), n)

	// If crashing, print a copy to the SetCrashOutput fd.
	gp := getg()