5 files changed, 23 insertions, 8 deletions
diff --git a/src/text/template/examplefiles_test.go b/src/text/template/examplefiles_test.go
index a15c7a62a3..6534ee3315 100644
--- a/src/text/template/examplefiles_test.go
+++ b/src/text/template/examplefiles_test.go
@@ -6,7 +6,6 @@ package template_test
 
 import (
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -20,7 +19,7 @@ type templateFile struct {
 }
 
 func createTestDir(files []templateFile) string {
-	dir, err := ioutil.TempDir("", "template")
+	dir, err := os.MkdirTemp("", "template")
 	if err != nil {
 		log.Fatal(err)
 	}
diff --git a/src/text/template/exec.go b/src/text/template/exec.go
index 7ac5175006..19154fc640 100644
--- a/src/text/template/exec.go
+++ b/src/text/template/exec.go
@@ -373,6 +373,10 @@ func (s *state) walkRange(dot reflect.Value, r *parse.RangeNode) {
 		if val.IsNil() {
 			break
 		}
+		if val.Type().ChanDir() == reflect.SendDir {
+			s.errorf("range over send-only channel %v", val)
+			break
+		}
 		i := 0
 		for ; ; i++ {
 			elem, ok := val.Recv()
diff --git a/src/text/template/exec_test.go b/src/text/template/exec_test.go
index 1611ee054f..1a129ed5af 100644
--- a/src/text/template/exec_test.go
+++ b/src/text/template/exec_test.go
@@ -1697,3 +1697,16 @@ func TestIssue31810(t *testing.T) {
 		t.Errorf("%s got %q, expected %q", textCall, b.String(), "result")
 	}
 }
+
+// Issue 43065, range over send only channel
+func TestIssue43065(t *testing.T) {
+	var b bytes.Buffer
+	tmp := Must(New("").Parse(`{{range .}}{{end}}`))
+	ch := make(chan<- int)
+	err := tmp.Execute(&b, ch)
+	if err == nil {
+		t.Error("expected err got nil")
+	} else if !strings.Contains(err.Error(), "range over send-only channel") {
+		t.Errorf("%s", err)
+	}
+}
diff --git a/src/text/template/helper.go b/src/text/template/helper.go
index 8269fa28c5..57905e613a 100644
--- a/src/text/template/helper.go
+++ b/src/text/template/helper.go
@@ -9,7 +9,7 @@ package template
 import (
 	"fmt"
 	"io/fs"
-	"io/ioutil"
+	"os"
 	"path"
 	"path/filepath"
 )
@@ -164,7 +164,7 @@ func parseFS(t *Template, fsys fs.FS, patterns []string) (*Template, error) {
 
 func readFileOS(file string) (name string, b []byte, err error) {
 	name = filepath.Base(file)
-	b, err = ioutil.ReadFile(file)
+	b, err = os.ReadFile(file)
 	return
 }
 
diff --git a/src/text/template/link_test.go b/src/text/template/link_test.go
index 4eac7e6755..9dc70dfc0d 100644
--- a/src/text/template/link_test.go
+++ b/src/text/template/link_test.go
@@ -7,7 +7,6 @@ package template_test
 import (
 	"bytes"
 	"internal/testenv"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -40,13 +39,13 @@ func main() {
 	t.Used()
 }
 `
-	td, err := ioutil.TempDir("", "text_template_TestDeadCodeElimination")
+	td, err := os.MkdirTemp("", "text_template_TestDeadCodeElimination")
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer os.RemoveAll(td)
 
-	if err := ioutil.WriteFile(filepath.Join(td, "x.go"), []byte(prog), 0644); err != nil {
+	if err := os.WriteFile(filepath.Join(td, "x.go"), []byte(prog), 0644); err != nil {
 		t.Fatal(err)
 	}
 	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "x.exe", "x.go")
@@ -54,7 +53,7 @@ func main() {
 	if out, err := cmd.CombinedOutput(); err != nil {
 		t.Fatalf("go build: %v, %s", err, out)
 	}
-	slurp, err := ioutil.ReadFile(filepath.Join(td, "x.exe"))
+	slurp, err := os.ReadFile(filepath.Join(td, "x.exe"))
 	if err != nil {
 		t.Fatal(err)
 	}