libgo: update to Go1.16beta1 release

This does not yet include support for the //go:embed directive added
in this release.

	* Makefile.am (check-runtime): Don't create check-runtime-dir.
	(mostlyclean-local): Don't remove check-runtime-dir.
	(check-go-tool, check-vet): Copy in go.mod and modules.txt.
	(check-cgo-test, check-carchive-test): Add go.mod file.
	* Makefile.in: Regenerate.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/280172

2 files changed, 7 insertions, 7 deletions

diff --git a/libgo/go/index/suffixarray/gen.go b/libgo/go/index/suffixarray/gen.go
index 8c3de55..94184d7 100644
--- a/libgo/go/index/suffixarray/gen.go
+++ b/libgo/go/index/suffixarray/gen.go
@@ -11,8 +11,8 @@ package main
 
 import (
 	"bytes"
-	"io/ioutil"
 	"log"
+	"os"
 	"strings"
 )
 
@@ -20,7 +20,7 @@ func main() {
 	log.SetPrefix("gen: ")
 	log.SetFlags(0)
 
-	data, err := ioutil.ReadFile("sais.go")
+	data, err := os.ReadFile("sais.go")
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -64,7 +64,7 @@ func main() {
 		}
 	}
 
-	if err := ioutil.WriteFile("sais2.go", buf.Bytes(), 0666); err != nil {
+	if err := os.WriteFile("sais2.go", buf.Bytes(), 0666); err != nil {
 		log.Fatal(err)
 	}
 }
diff --git a/libgo/go/index/suffixarray/suffixarray_test.go b/libgo/go/index/suffixarray/suffixarray_test.go
index 28090de..44c50415 100644
--- a/libgo/go/index/suffixarray/suffixarray_test.go
+++ b/libgo/go/index/suffixarray/suffixarray_test.go
@@ -7,7 +7,7 @@ package suffixarray
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io/fs"
 	"math/rand"
 	"os"
 	"path/filepath"
@@ -498,14 +498,14 @@ func makeText(name string) ([]byte, error) {
 	switch name {
 	case "opticks":
 		var err error
-		data, err = ioutil.ReadFile("../../testdata/Isaac.Newton-Opticks.txt")
+		data, err = os.ReadFile("../../testdata/Isaac.Newton-Opticks.txt")
 		if err != nil {
 			return nil, err
 		}
 	case "go":
-		err := filepath.Walk("../..", func(path string, info os.FileInfo, err error) error {
+		err := filepath.WalkDir("../..", func(path string, info fs.DirEntry, err error) error {
 			if err == nil && strings.HasSuffix(path, ".go") && !info.IsDir() {
-				file, err := ioutil.ReadFile(path)
+				file, err := os.ReadFile(path)
 				if err != nil {
 					return err
 				}