diff --git a/errgroup/errgroup.go b/errgroup/errgroup.go
index cfafed5..cb6bb9a 100644
--- a/errgroup/errgroup.go
+++ b/errgroup/errgroup.go
@@ -76,10 +76,8 @@ func (g *Group) Wait() error {
 }
 
 // Go calls the given function in a new goroutine.
-// The first call to Go must happen before a Wait.
-// It blocks until the new goroutine can be added without the number of
-// active goroutines in the group exceeding the configured limit.
 //
+// The first call to Go must happen before a Wait.
 // It blocks until the new goroutine can be added without the number of
 // goroutines in the group exceeding the configured limit.
 //
@@ -185,8 +183,9 @@ type PanicError struct {
 }
 
 func (p PanicError) Error() string {
-	// A Go Error method conventionally does not include a stack dump, so omit it
-	// here. (Callers who care can extract it from the Stack field.)
+	if len(p.Stack) > 0 {
+		return fmt.Sprintf("recovered from errgroup.Group: %v\n%s", p.Recovered, p.Stack)
+	}
 	return fmt.Sprintf("recovered from errgroup.Group: %v", p.Recovered)
 }
 
diff --git a/errgroup/errgroup_example_md5all_test.go b/errgroup/errgroup_example_md5all_test.go
index 739b336..e2fc15b 100644
--- a/errgroup/errgroup_example_md5all_test.go
+++ b/errgroup/errgroup_example_md5all_test.go
@@ -8,7 +8,6 @@ import (
 	"context"
 	"crypto/md5"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -69,7 +68,7 @@ func MD5All(ctx context.Context, root string) (map[string][md5.Size]byte, error)
 	for i := 0; i < numDigesters; i++ {
 		g.Go(func() error {
 			for path := range paths {
-				data, err := ioutil.ReadFile(path)
+				data, err := os.ReadFile(path)
 				if err != nil {
 					return err
 				}
diff --git a/errgroup/errgroup_test.go b/errgroup/errgroup_test.go
index 4684259..2165bb7 100644
--- a/errgroup/errgroup_test.go
+++ b/errgroup/errgroup_test.go
@@ -309,9 +309,9 @@ func TestPanic(t *testing.T) {
 			if pe.Recovered != p {
 				t.Fatalf("got %v, want %v", pe.Recovered, p)
 			}
-			if !strings.Contains(string(pe.Stack), "TestPanic.func") {
-				t.Log(string(pe.Stack))
-				t.Fatalf("stack trace incomplete")
+			if !strings.Contains(pe.Error(), "TestPanic.func") {
+				t.Log(pe.Error())
+				t.Fatalf("stack trace incomplete, does not contain TestPanic.func")
 			}
 		}()
 		g.Wait()