Update example usage in README.md

README.md

@@ -22,31 +22,45 @@ own.
 ## Example Usage
 
 ```go
-constructor := func(context.Context) (net.Conn, error) {
-  return net.Dial("tcp", "127.0.0.1:8080")
+package main
+
+import (
+	"context"
+	"log"
+	"net"
+
+	"github.com/jackc/puddle/v2"
+)
+
+func main() {
+	constructor := func(context.Context) (net.Conn, error) {
+		return net.Dial("tcp", "127.0.0.1:8080")
+	}
+	destructor := func(value net.Conn) {
+		value.Close()
+	}
+	maxPoolSize := int32(10)
+
+	pool, err := puddle.NewPool(&puddle.Config[net.Conn]{Constructor: constructor, Destructor: destructor, MaxSize: maxPoolSize})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Acquire resource from the pool.
+	res, err := pool.Acquire(context.Background())
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Use resource.
+	_, err = res.Value().Write([]byte{1})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Release when done.
+	res.Release()
 }
-destructor := func(value net.Conn) {
-  value.Close()
-}
-maxPoolSize := 10
-
-pool := puddle.NewPool[net.Conn](&puddle.Config[int]{Constructor: constructor, Destructor: destructor, MaxSize: maxPoolSize})
-
-// Acquire resource from the pool.
-res, err := pool.Acquire(context.Background())
-if err != nil {
-  // ...
-}
-
-// Use resource.
-_, err = res.Value().Write([]byte{1})
-if err != nil {
-  // ...
-}
-
-// Release when done.
-res.Release()
-
 ```
 
 ## Status