'Go test' recompiles each package along with any files with names matching
the file pattern "*_test.go".
These additional files can contain test functions, benchmark functions, fuzz
tests and example functions. See 'go help testfunc' for more.
Each listed package causes the execution of a separate test binary.
Files whose names begin with "_" (including "_test.go") or "." are ignored.

	//
	// We look for non-hidden .go files or subdirectories to determine whether
	// this is an existing project. Walking the tree for packages would be more
	// accurate, but could take much longer.
	empty := true
	files, _ := os.ReadDir(modRoot)
	for _, f := range files {
		name := f.Name()
		if strings.HasPrefix(name, ".") || strings.HasPrefix(name, "_") {

			if err != nil {
				ld.error(err)
				ld.exitIfErrors(ctx)
			}
		}

		// If the module's Go version omits go.sum entries for go.mod files for test
		// dependencies of external packages, avoid loading those files in the first
		// place.
		ld.skipImportModFiles = ld.Tidy && gover.Compare(goVersion, gover.TidyGoModSumVersion) < 0

	{19, "ENODEV", "operation not supported by device"},
	{20, "ENOTDIR", "not a directory"},
	{21, "EISDIR", "is a directory"},
	{22, "EINVAL", "invalid argument"},
	{23, "ENFILE", "too many open files in system"},
	{24, "EMFILE", "too many open files"},
	{25, "ENOTTY", "inappropriate ioctl for device"},
	{26, "ETXTBSY", "text file busy"},
	{27, "EFBIG", "file too large"},
	{28, "ENOSPC", "no space left on device"},

	{19, "ENODEV", "operation not supported by device"},
	{20, "ENOTDIR", "not a directory"},
	{21, "EISDIR", "is a directory"},
	{22, "EINVAL", "invalid argument"},
	{23, "ENFILE", "too many open files in system"},
	{24, "EMFILE", "too many open files"},
	{25, "ENOTTY", "inappropriate ioctl for device"},
	{26, "ETXTBSY", "text file busy"},
	{27, "EFBIG", "file too large"},
	{28, "ENOSPC", "no space left on device"},

			// other module depends on the main module, and that other module also
			// uses a pruned module graph, it will expect to find all of our
			// transitive dependencies by reading just our go.mod file, not the go.mod
			// files of everything we depend on.
			//
			// (This is the “import invariant” that makes graph pruning possible.)

		case rootsImported && pkg.flags.has(pkgFromRoot):

	{19, "ENODEV", "no such device"},
	{20, "ENOTDIR", "not a directory"},
	{21, "EISDIR", "is a directory"},
	{22, "EINVAL", "invalid argument"},
	{23, "ENFILE", "file table overflow"},
	{24, "EMFILE", "too many open files"},
	{25, "ENOTTY", "not a typewriter"},
	{26, "ETXTBSY", "text file busy"},
	{27, "EFBIG", "file too large"},
	{28, "ENOSPC", "no space left on device"},
	{29, "ESPIPE", "illegal seek"},

		if n.Kind == "type" && typedef[n.Mangle] == nil {
			typedef[n.Mangle] = n.Type
		}
	}
}

// mangleName does name mangling to translate names
// from the original Go source files to the names
// used in the final Go files generated by cgo.
func (p *Package) mangleName(n *Name) {
	// When using gccgo variables have to be
	// exported so that they become global symbols
	// that the C code can refer to.
	prefix := "_C"

//	Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

		s := unsafe.Slice((*byte)(unsafe.Pointer(&entry)), reclen)
		copy(buf, s)

		buf = buf[reclen:]
		n += reclen
		cnt++
	}
	// Set the seek offset of the input fd to record
	// how many files we've already returned.
	_, err = Seek(fd, cnt, 0 /* SEEK_SET */)
	if err != nil {
		return n, err
	}

	return n, nil
}

func Err2ad() (eadd *int) {