From 48138972b9bf8e13fed39acd6acec5163ae68edc Mon Sep 17 00:00:00 2001
From: mzack <marco.rivoli.nvh@gmail.com>
Date: Mon, 11 Sep 2023 09:38:33 +0200
Subject: [PATCH] using custom error

---
 net/net.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/net.go b/net/net.go
index a3c4eeb..a3ec78b 100644
--- a/net/net.go
+++ b/net/net.go
@@ -1,6 +1,11 @@
 package netutil
 
-import "net"
+import (
+	"errors"
+	"net"
+)
+
+var ErrMissingPort = errors.New("missing port")
 
 // TryJoinHostPort joins host and port. If port is empty, it returns host and an error.
 func TryJoinHostPort(host, port string) (string, error) {
@@ -9,7 +14,7 @@ func TryJoinHostPort(host, port string) (string, error) {
 	}
 
 	if port == "" {
-		return host, &net.AddrError{Err: "missing port", Addr: host}
+		return host, ErrMissingPort
 	}
 
 	return net.JoinHostPort(host, port), nil