3 files changed, 34 insertions, 24 deletions

diff --git a/src/go/parser/error_test.go b/src/go/parser/error_test.go
index 9b79097acf..358a844f65 100644
--- a/src/go/parser/error_test.go
+++ b/src/go/parser/error_test.go
@@ -25,7 +25,7 @@ package parser
 import (
 	"go/scanner"
 	"go/token"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"regexp"
 	"strings"
@@ -174,13 +174,13 @@ func checkErrors(t *testing.T, filename string, input interface{}) {
 }
 
 func TestErrors(t *testing.T) {
-	list, err := ioutil.ReadDir(testdata)
+	list, err := os.ReadDir(testdata)
 	if err != nil {
 		t.Fatal(err)
 	}
-	for _, fi := range list {
-		name := fi.Name()
-		if !fi.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".src") {
+	for _, d := range list {
+		name := d.Name()
+		if !d.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".src") {
 			checkErrors(t, filepath.Join(testdata, name), nil)
 		}
 	}
diff --git a/src/go/parser/interface.go b/src/go/parser/interface.go
index d5c18a9e2d..56ff5fefb4 100644
--- a/src/go/parser/interface.go
+++ b/src/go/parser/interface.go
@@ -13,7 +13,7 @@ import (
 	"go/token"
 	"io"
 	"io/fs"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strings"
 )
@@ -39,7 +39,7 @@ func readSource(filename string, src interface{}) ([]byte, error) {
 		}
 		return nil, errors.New("invalid source")
 	}
-	return ioutil.ReadFile(filename)
+	return os.ReadFile(filename)
 }
 
 // A Mode value is a set of flags (or 0).
@@ -133,29 +133,39 @@ func ParseFile(fset *token.FileSet, filename string, src interface{}, mode Mode)
 // first error encountered are returned.
 //
 func ParseDir(fset *token.FileSet, path string, filter func(fs.FileInfo) bool, mode Mode) (pkgs map[string]*ast.Package, first error) {
-	list, err := ioutil.ReadDir(path)
+	list, err := os.ReadDir(path)
 	if err != nil {
 		return nil, err
 	}
 
 	pkgs = make(map[string]*ast.Package)
 	for _, d := range list {
-		if !d.IsDir() && strings.HasSuffix(d.Name(), ".go") && (filter == nil || filter(d)) {
-			filename := filepath.Join(path, d.Name())
-			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
+		if d.IsDir() || !strings.HasSuffix(d.Name(), ".go") {
+			continue
+		}
+		if filter != nil {
+			info, err := d.Info()
+			if err != nil {
+				return nil, err
+			}
+			if !filter(info) {
+				continue
+			}
+		}
+		filename := filepath.Join(path, d.Name())
+		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),
 				}
-				pkg.Files[filename] = src
-			} else if first == nil {
-				first = err
+				pkgs[name] = pkg
 			}
+			pkg.Files[filename] = src
+		} else if first == nil {
+			first = err
 		}
 	}
 
diff --git a/src/go/parser/performance_test.go b/src/go/parser/performance_test.go
index f2732c0e2b..f81bcee969 100644
--- a/src/go/parser/performance_test.go
+++ b/src/go/parser/performance_test.go
@@ -6,14 +6,14 @@ package parser
 
 import (
 	"go/token"
-	"io/ioutil"
+	"os"
 	"testing"
 )
 
 var src = readFile("parser.go")
 
 func readFile(filename string) []byte {
-	data, err := ioutil.ReadFile(filename)
+	data, err := os.ReadFile(filename)
 	if err != nil {
 		panic(err)
 	}