func TestScanSelectedMask(t *testing.T) {
	testScanSelectedMode(t, 0, 0)
	testScanSelectedMode(t, ScanIdents, Ident)
	// Don't test ScanInts and ScanNumbers since some parts of
	// the floats in the source look like (invalid) octal ints
	// and ScanNumbers may return either Int or Float.
	testScanSelectedMode(t, ScanChars, Char)
	testScanSelectedMode(t, ScanStrings, String)
	testScanSelectedMode(t, SkipComments, 0)