}
		if err != nil {
			return errCorruptArchive
		}
		data = data[60:]
		fsize := size + size&1
		if fsize < 0 || fsize < size {
			return errCorruptArchive
		}
		switch name {
		case "__.PKGDEF":
			r.a.Entries = append(r.a.Entries, Entry{
				Name:  name,
				Type:  EntryPkgDef,
				Mtime: mtime,
				Uid:   uid,
				Gid:   gid,
				Mode:  mode,
				Data:  Data{r.offset, size},
			})

	out := run("./a.out")
	if out != "hello world\n" {
		t.Fatalf("incorrect output: %q, want %q", out, "hello world\n")
	}
}

// Test that pack works with very long lines in PKGDEF.
func TestLargeDefs(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping in -short mode")
	}
	testenv.MustHaveGoBuild(t)

	dir := t.TempDir()
	large := filepath.Join(dir, "large.go")