s.Whitespace = 1<<'\t' | 1<<'\r' | 1<<' '
	// Don't skip comments: we need to count newlines.
	s.Mode = scanner.ScanChars |
		scanner.ScanFloats |
		scanner.ScanIdents |
		scanner.ScanInts |
		scanner.ScanStrings |
		scanner.ScanComments
	s.Position.Filename = name
	s.IsIdentRune = isIdentRune
	return &Tokenizer{
		s:    &s,

	cmd = testenv.Command(t, testenv.GoToolPath(t), "tool", "nm", dst)
	out, err = cmd.CombinedOutput()
	if err != nil {
		t.Fatalf("could not read target: %v", err)
	}
	if bytes.Contains(out, []byte("scanInt")) {
		t.Fatalf("scanf code not removed from helloworld")
	}
}

// Make sure -S prints assembly code. See issue 14515.
func TestDashS(t *testing.T) {
	testenv.MustHaveGoBuild(t)
	t.Parallel()