b.Fatal(err)
		}
	}
	b.StopTimer()
	b.ReportMetric(float64(lines)*float64(b.N)/time.Since(start).Seconds(), "lines/s")
}

func pkgFiles(path string) ([]*syntax.File, error) {
	filenames, err := pkgFilenames(path, true) // from stdlib_test.go
	if err != nil {
		return nil, err
	}

	var files []*syntax.File
	for _, filename := range filenames {
		file, err := syntax.ParseFile(filename, nil, nil, 0)

		}
	}
	b.StopTimer()
	b.ReportMetric(float64(lines)*float64(b.N)/time.Since(start).Seconds(), "lines/s")
}

func pkgFiles(fset *token.FileSet, path string) ([]*ast.File, error) {
	filenames, err := pkgFilenames(path, true) // from stdlib_test.go
	if err != nil {
		return nil, err
	}

	var files []*ast.File
	for _, filename := range filenames {
		file, err := parser.ParseFile(fset, filename, nil, 0)