return false
	}

	// get package AST
	pkgs, err := parser.ParseDir(token.NewFileSet(), dirpath, filter, parser.ParseComments)
	if err != nil {
		println("parse", dirpath, err.Error())
		panic("go ParseDir fail: " + err.Error())
	}
	return pkgs
}

func stressParseGo() {
	pkgroot := runtime.GOROOT() + "/src/"
	for {
		m := make(map[string]map[string]*ast.Package)
		for _, pkg := range packages {

		if src, err := ParseFile(fset, filename, nil, mode); err == nil {
			name := src.Name.Name
			pkg, found := pkgs[name]
			if !found {
				pkg = &ast.Package{
					Name:  name,
					Files: make(map[string]*ast.File),
				}
				pkgs[name] = pkg
			}
			pkg.Files[filename] = src
		} else if first == nil {
			first = err
		}
	}

	return
}

		}
	}

	// get packages
	fset := token.NewFileSet()
	pkgs, err := parser.ParseDir(fset, dataDir, filter, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}

	// test packages
	for _, pkg := range pkgs {
		t.Run(pkg.Name, func(t *testing.T) {
			importPath := dataDir + "/" + pkg.Name
			var files []*ast.File
			for _, f := range pkg.Files {
				files = append(files, f)
			}

        def packagePrefixes = [ 'allowed.pkgprefix1.', 'allowed.pkgprefix2' ]
        def disallowedPackagePrefixes = [ 'disallowed.pkgprefix1.', 'disallowed.pkgprefix2.' ]
        def packageNames = [ 'allowed.pkg1', 'allowed.pkg2' ]
        def resourceNames = [ 'allowed.resource1', 'allowed.resource2' ]
        def resourcePrefixes = [ 'allowed.resourcePrefix1.', 'allowed.resourcePrefix2.' ]

	}
	for _, m := range mms.Versions() {
		opts.MainModule = m
		_, pkgs := modload.LoadPackages(ctx, opts, "all")
		opts.MainModule = module.Version{} // reset

		var (
			mustSelect   []module.Version
			inMustSelect = map[module.Version]bool{}
		)
		for _, pkg := range pkgs {
			if r := modload.PackageModule(pkg); r.Version != "" && !inMustSelect[r] {
				// r has a known version, so force that version.

        def packagePrefixes = [ 'allowed.pkgprefix1.', 'allowed.pkgprefix2' ]
        def disallowedPackagePrefixes = [ 'disallowed.pkgprefix1.', 'disallowed.pkgprefix2.' ]
        def packageNames = [ 'allowed.pkg1', 'allowed.pkg2' ]
        def resourceNames = [ 'allowed.resource1', 'allowed.resource2' ]
        def resourcePrefixes = [ 'allowed.resourcePrefix1.', 'allowed.resourcePrefix2.' ]

        def packagePrefixes = [ 'allowed.pkgprefix1.', 'allowed.pkgprefix2' ]
        def disallowedPackagePrefixes = [ 'disallowed.pkgprefix1.', 'disallowed.pkgprefix2.' ]
        def packageNames = [ 'allowed.pkg1', 'allowed.pkg2' ]
        def resourceNames = [ 'allowed.resource1', 'allowed.resource2' ]
        def resourcePrefixes = [ 'allowed.resourcePrefix1.', 'allowed.resourcePrefix2.' ]

# Tests issue #18778
[short] skip

cd pkgs

env GO111MODULE=off
go build ./...
! stdout .
go test ./...
stdout '^ok'
go list ./...
stdout 'pkgs$'
stdout 'pkgs/a'

-- pkgs/go.mod --
module pkgs

go 1.16
-- pkgs/a.go --
package x
-- pkgs/a_test.go --
package x_test

import "testing"

func TestX(t *testing.T) {
}
-- pkgs/a/a.go --
package a
-- pkgs/a/a_test.go --
package a_test

}

func ppfDirTest(pattern string, nmatch int, dirs ...string) ppfTest {
	var pkgs []ppfTestPackage
	for i, d := range dirs {
		flags := []string{}
		if i < nmatch {
			flags = []string{"-S"}
		}
		pkgs = append(pkgs, ppfTestPackage{path: "p", dir: d, flags: flags})
	}
	return ppfTest{args: []string{pattern + "=-S"}, pkgs: pkgs}
}

func TestPerPackageFlag(t *testing.T) {
	nativeDir := func(d string) string {

func Dependencies(pkgs ...*types.Package) []*types.Package {
	var result []*types.Package
	seen := make(map[*types.Package]bool)
	var visit func(pkgs []*types.Package)
	visit = func(pkgs []*types.Package) {
		for _, p := range pkgs {
			if !seen[p] {
				seen[p] = true
				visit(p.Imports())
				result = append(result, p)
			}
		}
	}
	visit(pkgs)
	return result