func FileWithLineNum() string {
	// Keep FileWithLineNum one frame outer than CallerFrame to preserve pre-v1.31.1 semantics.
	frame := callerFrame(4)
	if frame.PC != 0 {
		return string(strconv.AppendInt(append([]byte(frame.File), ':'), int64(frame.Line), 10))
	}

	return ""
}

func IsInvalidDBNameChar(c rune) bool {

	}
}

func TestWriteAppend(t *testing.T) {
	var got Buffer
	var want []byte
	for i := 0; i < 1000; i++ {
		b := got.AvailableBuffer()
		b = strconv.AppendInt(b, int64(i), 10)
		want = strconv.AppendInt(want, int64(i), 10)
		got.Write(b)
	}
	if !Equal(got.Bytes(), want) {
		t.Fatalf("Bytes() = %q, want %q", &got, want)
	}