t.Errorf("pkg.Name = %q; want %q", pkg.Name, wantName)
	}

	if wantGoFiles := []string{"file.go", "file_appengine.go"}; !reflect.DeepEqual(pkg.GoFiles, wantGoFiles) {
		t.Errorf("pkg.GoFiles = %q; want %q", pkg.GoFiles, wantGoFiles)
	}

	if wantInvalidFiles := []string{"file_appengine.go"}; !reflect.DeepEqual(pkg.InvalidGoFiles, wantInvalidFiles) {

		ptest = new(Package)
		*ptest = *p
		ptest.Error = ptestErr
		ptest.Incomplete = incomplete
		ptest.ForTest = p.ImportPath
		ptest.GoFiles = nil
		ptest.GoFiles = append(ptest.GoFiles, p.GoFiles...)
		ptest.GoFiles = append(ptest.GoFiles, p.TestGoFiles...)
		ptest.Target = ""
		// Note: The preparation of the vet config requires that common
		// indexes in ptest.Imports and ptest.Internal.RawImports

	// same basename, so go from the overlay contents file path (passed to the compiler)
	// to the path the disk path would be rewritten to.

	cgoFiles := make(map[string]bool)
	for _, f := range a.Package.CgoFiles {
		cgoFiles[f] = true
	}

	// TODO(matloob): Higher up in the stack, when the logic for deciding when to make copies

	Dir                       string // (unused)
	ImportPath                string // package path
	GoVersion                 string // minimum required Go version, such as "go1.21.0"
	GoFiles                   []string
	NonGoFiles                []string
	IgnoredFiles              []string
	ImportMap                 map[string]string // maps import path to package path

	var (
		goFiles     = make(map[string]*ast.File)
		testGoFiles []*ast.File
	)
	for i := range files {
		f := fset.File(files[i].Pos())
		if f == nil {
			return nil, fmt.Errorf("file files[%d] is not found in the provided file set", i)
		}
		switch name := f.Name(); {
		case strings.HasSuffix(name, ".go") && !strings.HasSuffix(name, "_test.go"):
			goFiles[name] = files[i]

	return errs
}

// packageDir tries to figure out the directory of the specified package.
func packageDir(pkg *packages.Package) string {
	if len(pkg.GoFiles) > 0 {
		return filepath.Dir(pkg.GoFiles[0])
	}
	if len(pkg.IgnoredFiles) > 0 {
		return filepath.Dir(pkg.IgnoredFiles[0])
	}
	return ""
}

type FileFormat struct {
	Rules        []Rule
	InverseRules []Rule

	return nil
}

func (tools gccgoToolchain) asm(b *Builder, a *Action, sfiles []string) ([]string, error) {
	p := a.Package
	var ofiles []string
	for _, sfile := range sfiles {
		base := filepath.Base(sfile)
		ofile := a.Objdir + base[:len(base)-len(".s")] + ".o"
		ofiles = append(ofiles, ofile)
		sfile, _ = fsys.OverlayPath(mkAbs(p.Dir, sfile))
		defs := []string{"-D", "GOOS_" + cfg.Goos, "-D", "GOARCH_" + cfg.Goarch}

files presented to the compiler. Typically this means that it repeats
the files listed in GoFiles and then also adds the Go code generated
by processing CgoFiles and SwigFiles. The Imports list contains the
union of all imports from both GoFiles and CompiledGoFiles.

The -deps flag causes list to iterate over not just the named packages

			if err := adbCopyTree(deviceCwd, importPath); err != nil {
				return 0, err
			}

			// Copy .go files from the package.
			goFiles, err := filepath.Glob("*.go")
			if err != nil {
				return 0, err
			}
			if len(goFiles) > 0 {
				args := append(append([]string{"push"}, goFiles...), deviceCwd)
				if err := adb(args...); err != nil {
					return 0, err
				}
			}
		}
	}

		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
	}

	// Get list of packages in stdlib. Filter out test-only packages with {{if .GoFiles}} check.
	var stderr bytes.Buffer
	cmd := exec.Command("go", "list", "-f", "{{if .GoFiles}}{{.ImportPath}}{{end}}", "std")
	cmd.Stderr = &stderr
	out, err := cmd.Output()
	if err != nil {