testScanSelectedMode(t, ScanChars, Char)
	testScanSelectedMode(t, ScanStrings, String)
	testScanSelectedMode(t, SkipComments, 0)
	testScanSelectedMode(t, ScanComments, Comment)
}

func TestScanCustomIdent(t *testing.T) {
	const src = "faab12345 a12b123 a12 3b"
	s := new(Scanner).Init(strings.NewReader(src))
	// ident = ( 'a' | 'b' ) { digit } .
	// digit = '0' .. '3' .
	// with a maximum length of 4