all: replace package ioutil with os and io in src

For #45557

Change-Id: I56824135d86452603dd4ed4bab0e24c201bb0683
Reviewed-on: https://go-review.googlesource.com/c/go/+/426257
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Andy Pan <panjf2000@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>

10 files changed, 79 insertions, 78 deletions

diff --git a/src/cmd/link/elf_test.go b/src/cmd/link/elf_test.go
index 5b7b95757b..5037f5b6c0 100644
--- a/src/cmd/link/elf_test.go
+++ b/src/cmd/link/elf_test.go
@@ -8,11 +8,9 @@
 package main
 
 import (
-	"cmd/internal/sys"
 	"debug/elf"
 	"fmt"
 	"internal/testenv"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -21,6 +19,8 @@ import (
 	"sync"
 	"testing"
 	"text/template"
+
+	"cmd/internal/sys"
 )
 
 func getCCAndCCFLAGS(t *testing.T, env []string) (string, []string) {
@@ -75,12 +75,12 @@ func TestSectionsWithSameName(t *testing.T) {
 	gopath := filepath.Join(dir, "GOPATH")
 	env := append(os.Environ(), "GOPATH="+gopath)
 
-	if err := ioutil.WriteFile(filepath.Join(dir, "go.mod"), []byte("module elf_test\n"), 0666); err != nil {
+	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte("module elf_test\n"), 0666); err != nil {
 		t.Fatal(err)
 	}
 
 	asmFile := filepath.Join(dir, "x.s")
-	if err := ioutil.WriteFile(asmFile, []byte(asmSource), 0444); err != nil {
+	if err := os.WriteFile(asmFile, []byte(asmSource), 0444); err != nil {
 		t.Fatal(err)
 	}
 
@@ -108,7 +108,7 @@ func TestSectionsWithSameName(t *testing.T) {
 	}
 
 	goFile := filepath.Join(dir, "main.go")
-	if err := ioutil.WriteFile(goFile, []byte(goSource), 0444); err != nil {
+	if err := os.WriteFile(goFile, []byte(goSource), 0444); err != nil {
 		t.Fatal(err)
 	}
 
@@ -145,7 +145,7 @@ func TestMinusRSymsWithSameName(t *testing.T) {
 	gopath := filepath.Join(dir, "GOPATH")
 	env := append(os.Environ(), "GOPATH="+gopath)
 
-	if err := ioutil.WriteFile(filepath.Join(dir, "go.mod"), []byte("module elf_test\n"), 0666); err != nil {
+	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte("module elf_test\n"), 0666); err != nil {
 		t.Fatal(err)
 	}
 
@@ -157,7 +157,7 @@ func TestMinusRSymsWithSameName(t *testing.T) {
 	for i, content := range cSources35779 {
 		csrcFile := filepath.Join(dir, fmt.Sprintf("x%d.c", i))
 		csrcs = append(csrcs, csrcFile)
-		if err := ioutil.WriteFile(csrcFile, []byte(content), 0444); err != nil {
+		if err := os.WriteFile(csrcFile, []byte(content), 0444); err != nil {
 			t.Fatal(err)
 		}
 
@@ -187,7 +187,7 @@ func TestMinusRSymsWithSameName(t *testing.T) {
 	}
 
 	goFile := filepath.Join(dir, "main.go")
-	if err := ioutil.WriteFile(goFile, []byte(goSource), 0444); err != nil {
+	if err := os.WriteFile(goFile, []byte(goSource), 0444); err != nil {
 		t.Fatal(err)
 	}
 
@@ -216,7 +216,7 @@ func TestMergeNoteSections(t *testing.T) {
 	t.Parallel()
 
 	goFile := filepath.Join(t.TempDir(), "notes.go")
-	if err := ioutil.WriteFile(goFile, []byte(goSource), 0444); err != nil {
+	if err := os.WriteFile(goFile, []byte(goSource), 0444); err != nil {
 		t.Fatal(err)
 	}
 	outFile := filepath.Join(t.TempDir(), "notes.exe")
diff --git a/src/cmd/link/internal/ld/dwarf_test.go b/src/cmd/link/internal/ld/dwarf_test.go
index 4b50371161..65f82d9d78 100644
--- a/src/cmd/link/internal/ld/dwarf_test.go
+++ b/src/cmd/link/internal/ld/dwarf_test.go
@@ -5,15 +5,11 @@
 package ld
 
 import (
-	intdwarf "cmd/internal/dwarf"
-	objfilepkg "cmd/internal/objfile" // renamed to avoid conflict with objfile function
-	"cmd/link/internal/dwtest"
 	"debug/dwarf"
 	"debug/pe"
 	"fmt"
 	"internal/testenv"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -23,6 +19,10 @@ import (
 	"strconv"
 	"strings"
 	"testing"
+
+	intdwarf "cmd/internal/dwarf"
+	objfilepkg "cmd/internal/objfile" // renamed to avoid conflict with objfile function
+	"cmd/link/internal/dwtest"
 )
 
 const (
@@ -96,7 +96,7 @@ func gobuild(t *testing.T, dir string, testfile string, gcflags string) *builtFi
 	src := filepath.Join(dir, "test.go")
 	dst := filepath.Join(dir, "out.exe")
 
-	if err := ioutil.WriteFile(src, []byte(testfile), 0666); err != nil {
+	if err := os.WriteFile(src, []byte(testfile), 0666); err != nil {
 		t.Fatal(err)
 	}
 
@@ -1394,7 +1394,7 @@ func TestIssue42484(t *testing.T) {
 
 	t.Parallel()
 
-	tmpdir, err := ioutil.TempDir("", "TestIssue42484")
+	tmpdir, err := os.MkdirTemp("", "TestIssue42484")
 	if err != nil {
 		t.Fatalf("could not create directory: %v", err)
 	}
diff --git a/src/cmd/link/internal/ld/elf_test.go b/src/cmd/link/internal/ld/elf_test.go
index 7d59249f3a..9f5a0ed9e2 100644
--- a/src/cmd/link/internal/ld/elf_test.go
+++ b/src/cmd/link/internal/ld/elf_test.go
@@ -10,7 +10,6 @@ package ld
 import (
 	"debug/elf"
 	"internal/testenv"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -34,7 +33,7 @@ func main() {
 }
 `
 	src := filepath.Join(dir, "issue33358.go")
-	if err := ioutil.WriteFile(src, []byte(prog), 0666); err != nil {
+	if err := os.WriteFile(src, []byte(prog), 0666); err != nil {
 		t.Fatal(err)
 	}
 
diff --git a/src/cmd/link/internal/ld/go_test.go b/src/cmd/link/internal/ld/go_test.go
index 230f85a0e5..7dc9b57112 100644
--- a/src/cmd/link/internal/ld/go_test.go
+++ b/src/cmd/link/internal/ld/go_test.go
@@ -5,14 +5,15 @@
 package ld
 
 import (
-	"cmd/internal/objabi"
 	"internal/testenv"
-	"io/ioutil"
+	"os"
 	"os/exec"
 	"path/filepath"
 	"reflect"
 	"runtime"
 	"testing"
+
+	"cmd/internal/objabi"
 )
 
 func TestDedupLibraries(t *testing.T) {
@@ -99,7 +100,7 @@ import (
 //go:cgo_import_dynamic _ _ "libc.so"
 
 func main() {}`
-	if err := ioutil.WriteFile(srcFile, []byte(src), 0644); err != nil {
+	if err := os.WriteFile(srcFile, []byte(src), 0644); err != nil {
 		t.Fatal(err)
 	}
 
diff --git a/src/cmd/link/internal/ld/ld.go b/src/cmd/link/internal/ld/ld.go
index 709a6d0be6..d416571653 100644
--- a/src/cmd/link/internal/ld/ld.go
+++ b/src/cmd/link/internal/ld/ld.go
@@ -32,22 +32,22 @@
 package ld
 
 import (
-	"cmd/internal/goobj"
-	"cmd/link/internal/loader"
-	"cmd/link/internal/sym"
-	"io/ioutil"
 	"log"
 	"os"
 	"path"
 	"path/filepath"
 	"strconv"
 	"strings"
+
+	"cmd/internal/goobj"
+	"cmd/link/internal/loader"
+	"cmd/link/internal/sym"
 )
 
 func (ctxt *Link) readImportCfg(file string) {
 	ctxt.PackageFile = make(map[string]string)
 	ctxt.PackageShlib = make(map[string]string)
-	data, err := ioutil.ReadFile(file)
+	data, err := os.ReadFile(file)
 	if err != nil {
 		log.Fatalf("-importcfg: %v", err)
 	}
@@ -196,7 +196,7 @@ func addlibpath(ctxt *Link, srcref, objref, file, pkg, shlib string, fingerprint
 	l.Fingerprint = fingerprint
 	if shlib != "" {
 		if strings.HasSuffix(shlib, ".shlibname") {
-			data, err := ioutil.ReadFile(shlib)
+			data, err := os.ReadFile(shlib)
 			if err != nil {
 				Errorf(nil, "cannot read %s: %v", shlib, err)
 			}
diff --git a/src/cmd/link/internal/ld/ld_test.go b/src/cmd/link/internal/ld/ld_test.go
index 2d5a7add9d..e1149d3e56 100644
--- a/src/cmd/link/internal/ld/ld_test.go
+++ b/src/cmd/link/internal/ld/ld_test.go
@@ -9,7 +9,7 @@ import (
 	"debug/pe"
 	"fmt"
 	"internal/testenv"
-	"io/ioutil"
+	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
@@ -107,7 +107,7 @@ func TestArchiveBuildInvokeWithExec(t *testing.T) {
 
 	srcfile := filepath.Join(dir, "test.go")
 	arfile := filepath.Join(dir, "test.a")
-	if err := ioutil.WriteFile(srcfile, []byte(carchiveSrcText), 0666); err != nil {
+	if err := os.WriteFile(srcfile, []byte(carchiveSrcText), 0666); err != nil {
 		t.Fatal(err)
 	}
 
@@ -202,7 +202,7 @@ func testWindowsBuildmodeCSharedASLR(t *testing.T, useASLR bool) {
 
 	srcfile := filepath.Join(dir, "test.go")
 	objfile := filepath.Join(dir, "test.dll")
-	if err := ioutil.WriteFile(srcfile, []byte(`package main; func main() { print("hello") }`), 0666); err != nil {
+	if err := os.WriteFile(srcfile, []byte(`package main; func main() { print("hello") }`), 0666); err != nil {
 		t.Fatal(err)
 	}
 	argv := []string{"build", "-buildmode=c-shared"}
@@ -327,7 +327,7 @@ func main() {
 			t.Parallel()
 			tempDir := t.TempDir()
 			src := filepath.Join(tempDir, "x.go")
-			if err := ioutil.WriteFile(src, []byte(tt.prog), 0644); err != nil {
+			if err := os.WriteFile(src, []byte(tt.prog), 0644); err != nil {
 				t.Fatal(err)
 			}
 			cmd := exec.Command(testenv.GoToolPath(t), "run", src)
diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index f4a1f1800f..fa2ee676a9 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -32,17 +32,6 @@ package ld
 
 import (
 	"bytes"
-	"cmd/internal/bio"
-	"cmd/internal/goobj"
-	"cmd/internal/notsha256"
-	"cmd/internal/objabi"
-	"cmd/internal/sys"
-	"cmd/link/internal/loadelf"
-	"cmd/link/internal/loader"
-	"cmd/link/internal/loadmacho"
-	"cmd/link/internal/loadpe"
-	"cmd/link/internal/loadxcoff"
-	"cmd/link/internal/sym"
 	"debug/elf"
 	"debug/macho"
 	"encoding/base64"
@@ -50,7 +39,6 @@ import (
 	"fmt"
 	"internal/buildcfg"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -58,6 +46,18 @@ import (
 	"runtime"
 	"strings"
 	"sync"
+
+	"cmd/internal/bio"
+	"cmd/internal/goobj"
+	"cmd/internal/notsha256"
+	"cmd/internal/objabi"
+	"cmd/internal/sys"
+	"cmd/link/internal/loadelf"
+	"cmd/link/internal/loader"
+	"cmd/link/internal/loadmacho"
+	"cmd/link/internal/loadpe"
+	"cmd/link/internal/loadxcoff"
+	"cmd/link/internal/sym"
 )
 
 // Data layout and relocation.
@@ -1157,7 +1157,7 @@ func hostlinksetup(ctxt *Link) {
 
 	// create temporary directory and arrange cleanup
 	if *flagTmpdir == "" {
-		dir, err := ioutil.TempDir("", "go-link-")
+		dir, err := os.MkdirTemp("", "go-link-")
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -1238,7 +1238,7 @@ func writeGDBLinkerScript() string {
 }
 INSERT AFTER .debug_types;
 `
-	err := ioutil.WriteFile(path, []byte(src), 0666)
+	err := os.WriteFile(path, []byte(src), 0666)
 	if err != nil {
 		Errorf(nil, "WriteFile %s failed: %v", name, err)
 	}
@@ -1849,7 +1849,7 @@ var createTrivialCOnce sync.Once
 func linkerFlagSupported(arch *sys.Arch, linker, altLinker, flag string) bool {
 	createTrivialCOnce.Do(func() {
 		src := filepath.Join(*flagTmpdir, "trivial.c")
-		if err := ioutil.WriteFile(src, []byte("int main() { return 0; }"), 0666); err != nil {
+		if err := os.WriteFile(src, []byte("int main() { return 0; }"), 0666); err != nil {
 			Errorf(nil, "WriteFile trivial.c failed: %v", err)
 		}
 	})
diff --git a/src/cmd/link/internal/ld/xcoff.go b/src/cmd/link/internal/ld/xcoff.go
index 3fac071a04..7b4d506a00 100644
--- a/src/cmd/link/internal/ld/xcoff.go
+++ b/src/cmd/link/internal/ld/xcoff.go
@@ -6,17 +6,18 @@ package ld
 
 import (
 	"bytes"
-	"cmd/internal/objabi"
-	"cmd/link/internal/loader"
-	"cmd/link/internal/sym"
 	"encoding/binary"
 	"fmt"
-	"io/ioutil"
 	"math/bits"
+	"os"
 	"path/filepath"
 	"sort"
 	"strings"
 	"sync"
+
+	"cmd/internal/objabi"
+	"cmd/link/internal/loader"
+	"cmd/link/internal/sym"
 )
 
 // This file handles all algorithms related to XCOFF files generation.
@@ -1805,7 +1806,7 @@ func xcoffCreateExportFile(ctxt *Link) (fname string) {
 		buf.Write([]byte(name + "\n"))
 	}
 
-	err := ioutil.WriteFile(fname, buf.Bytes(), 0666)
+	err := os.WriteFile(fname, buf.Bytes(), 0666)
 	if err != nil {
 		Errorf(nil, "WriteFile %s failed: %v", fname, err)
 	}
diff --git a/src/cmd/link/link_test.go b/src/cmd/link/link_test.go
index 45dc6b322d..c1a30363cb 100644
--- a/src/cmd/link/link_test.go
+++ b/src/cmd/link/link_test.go
@@ -7,11 +7,9 @@ package main
 import (
 	"bufio"
 	"bytes"
-	"cmd/internal/sys"
 	"debug/macho"
 	"internal/buildcfg"
 	"internal/testenv"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -19,6 +17,8 @@ import (
 	"runtime"
 	"strings"
 	"testing"
+
+	"cmd/internal/sys"
 )
 
 var AuthorPaidByTheColumnInch struct {
@@ -51,7 +51,7 @@ func main() {}
 
 	tmpdir := t.TempDir()
 
-	err := ioutil.WriteFile(filepath.Join(tmpdir, "main.go"), []byte(source), 0666)
+	err := os.WriteFile(filepath.Join(tmpdir, "main.go"), []byte(source), 0666)
 	if err != nil {
 		t.Fatalf("failed to write main.go: %v\n", err)
 	}
@@ -83,7 +83,7 @@ func TestIssue28429(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	write := func(name, content string) {
-		err := ioutil.WriteFile(filepath.Join(tmpdir, name), []byte(content), 0666)
+		err := os.WriteFile(filepath.Join(tmpdir, name), []byte(content), 0666)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -122,7 +122,7 @@ func TestUnresolved(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	write := func(name, content string) {
-		err := ioutil.WriteFile(filepath.Join(tmpdir, name), []byte(content), 0666)
+		err := os.WriteFile(filepath.Join(tmpdir, name), []byte(content), 0666)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -190,7 +190,7 @@ func TestIssue33979(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	write := func(name, content string) {
-		err := ioutil.WriteFile(filepath.Join(tmpdir, name), []byte(content), 0666)
+		err := os.WriteFile(filepath.Join(tmpdir, name), []byte(content), 0666)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -328,7 +328,7 @@ func TestXFlag(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "main.go")
-	err := ioutil.WriteFile(src, []byte(testXFlagSrc), 0666)
+	err := os.WriteFile(src, []byte(testXFlagSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -352,7 +352,7 @@ func TestMachOBuildVersion(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "main.go")
-	err := ioutil.WriteFile(src, []byte(testMachOBuildVersionSrc), 0666)
+	err := os.WriteFile(src, []byte(testMachOBuildVersionSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -428,7 +428,7 @@ func TestIssue34788Android386TLSSequence(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "blah.go")
-	err := ioutil.WriteFile(src, []byte(Issue34788src), 0666)
+	err := os.WriteFile(src, []byte(Issue34788src), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -504,19 +504,19 @@ func TestStrictDup(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "x.go")
-	err := ioutil.WriteFile(src, []byte(testStrictDupGoSrc), 0666)
+	err := os.WriteFile(src, []byte(testStrictDupGoSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
 	for _, af := range asmfiles {
 		src = filepath.Join(tmpdir, af.fname+".s")
-		err = ioutil.WriteFile(src, []byte(af.payload), 0666)
+		err = os.WriteFile(src, []byte(af.payload), 0666)
 		if err != nil {
 			t.Fatal(err)
 		}
 	}
 	src = filepath.Join(tmpdir, "go.mod")
-	err = ioutil.WriteFile(src, []byte("module teststrictdup\n"), 0666)
+	err = os.WriteFile(src, []byte("module teststrictdup\n"), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -589,17 +589,17 @@ func TestFuncAlign(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "go.mod")
-	err := ioutil.WriteFile(src, []byte("module cmd/link/TestFuncAlign/falign"), 0666)
+	err := os.WriteFile(src, []byte("module cmd/link/TestFuncAlign/falign"), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
 	src = filepath.Join(tmpdir, "falign.go")
-	err = ioutil.WriteFile(src, []byte(testFuncAlignSrc), 0666)
+	err = os.WriteFile(src, []byte(testFuncAlignSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
 	src = filepath.Join(tmpdir, "falign.s")
-	err = ioutil.WriteFile(src, []byte(testFuncAlignAsmSrc), 0666)
+	err = os.WriteFile(src, []byte(testFuncAlignAsmSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -662,7 +662,7 @@ func TestTrampoline(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "hello.go")
-	err := ioutil.WriteFile(src, []byte(testTrampSrc), 0666)
+	err := os.WriteFile(src, []byte(testTrampSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -720,7 +720,7 @@ func TestTrampolineCgo(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "hello.go")
-	err := ioutil.WriteFile(src, []byte(testTrampCgoSrc), 0666)
+	err := os.WriteFile(src, []byte(testTrampCgoSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -842,7 +842,7 @@ func TestPErsrcBinutils(t *testing.T) {
 	}
 
 	// Check that the binary contains the rsrc data
-	b, err := ioutil.ReadFile(exe)
+	b, err := os.ReadFile(exe)
 	if err != nil {
 		t.Fatalf("reading output failed: %v", err)
 	}
@@ -874,7 +874,7 @@ func TestPErsrcLLVM(t *testing.T) {
 	}
 
 	// Check that the binary contains the rsrc data
-	b, err := ioutil.ReadFile(exe)
+	b, err := os.ReadFile(exe)
 	if err != nil {
 		t.Fatalf("reading output failed: %v", err)
 	}
@@ -935,7 +935,7 @@ func TestIssue38554(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "x.go")
-	err := ioutil.WriteFile(src, []byte(testIssue38554Src), 0666)
+	err := os.WriteFile(src, []byte(testIssue38554Src), 0666)
 	if err != nil {
 		t.Fatalf("failed to write source file: %v", err)
 	}
@@ -985,7 +985,7 @@ func TestIssue42396(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "main.go")
-	err := ioutil.WriteFile(src, []byte(testIssue42396src), 0666)
+	err := os.WriteFile(src, []byte(testIssue42396src), 0666)
 	if err != nil {
 		t.Fatalf("failed to write source file: %v", err)
 	}
@@ -1056,7 +1056,7 @@ func TestLargeReloc(t *testing.T) {
 	tmpdir := t.TempDir()
 
 	src := filepath.Join(tmpdir, "x.go")
-	err := ioutil.WriteFile(src, []byte(testLargeRelocSrc), 0666)
+	err := os.WriteFile(src, []byte(testLargeRelocSrc), 0666)
 	if err != nil {
 		t.Fatalf("failed to write source file: %v", err)
 	}
@@ -1091,11 +1091,11 @@ func TestUnlinkableObj(t *testing.T) {
 	xObj := filepath.Join(tmpdir, "x.o")
 	pObj := filepath.Join(tmpdir, "p.o")
 	exe := filepath.Join(tmpdir, "x.exe")
-	err := ioutil.WriteFile(xSrc, []byte("package main\nimport _ \"p\"\nfunc main() {}\n"), 0666)
+	err := os.WriteFile(xSrc, []byte("package main\nimport _ \"p\"\nfunc main() {}\n"), 0666)
 	if err != nil {
 		t.Fatalf("failed to write source file: %v", err)
 	}
-	err = ioutil.WriteFile(pSrc, []byte("package p\n"), 0666)
+	err = os.WriteFile(pSrc, []byte("package p\n"), 0666)
 	if err != nil {
 		t.Fatalf("failed to write source file: %v", err)
 	}
diff --git a/src/cmd/link/linkbig_test.go b/src/cmd/link/linkbig_test.go
index 2551afc8cb..796adfd422 100644
--- a/src/cmd/link/linkbig_test.go
+++ b/src/cmd/link/linkbig_test.go
@@ -13,7 +13,7 @@ import (
 	"fmt"
 	"internal/buildcfg"
 	"internal/testenv"
-	"io/ioutil"
+	"os"
 	"os/exec"
 	"testing"
 )
@@ -28,7 +28,7 @@ func TestLargeText(t *testing.T) {
 	const FN = 4
 	tmpdir := t.TempDir()
 
-	if err := ioutil.WriteFile(tmpdir+"/go.mod", []byte("module big_test\n"), 0666); err != nil {
+	if err := os.WriteFile(tmpdir+"/go.mod", []byte("module big_test\n"), 0666); err != nil {
 		t.Fatal(err)
 	}
 
@@ -50,7 +50,7 @@ func TestLargeText(t *testing.T) {
 			fmt.Fprintf(&w, inst)
 		}
 		fmt.Fprintf(&w, "\tRET\n")
-		err := ioutil.WriteFile(tmpdir+"/"+testname+".s", w.Bytes(), 0666)
+		err := os.WriteFile(tmpdir+"/"+testname+".s", w.Bytes(), 0666)
 		if err != nil {
 			t.Fatalf("can't write output: %v\n", err)
 		}
@@ -77,7 +77,7 @@ func TestLargeText(t *testing.T) {
 	fmt.Fprintf(&w, "\t}\n")
 	fmt.Fprintf(&w, "\tfmt.Printf(\"PASS\\n\")\n")
 	fmt.Fprintf(&w, "}")
-	err := ioutil.WriteFile(tmpdir+"/bigfn.go", w.Bytes(), 0666)
+	err := os.WriteFile(tmpdir+"/bigfn.go", w.Bytes(), 0666)
 	if err != nil {
 		t.Fatalf("can't write output: %v\n", err)
 	}