From 2d980ace659d93557c376d9c080445cc8b95d87e Mon Sep 17 00:00:00 2001
From: james <jamesfan1010@gmail.com>
Date: Wed, 22 Mar 2017 11:08:01 +0800
Subject: [PATCH 1/2] add withMessage.Msg and errors.SecondCauseMsg func

---
 errors.go | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/errors.go b/errors.go
index 842ee804..e9143694 100644
--- a/errors.go
+++ b/errors.go
@@ -227,6 +227,7 @@ type withMessage struct {
 
 func (w *withMessage) Error() string { return w.msg + ": " + w.cause.Error() }
 func (w *withMessage) Cause() error  { return w.cause }
+func (w *withMessage) Msg() string   { return w.msg }
 
 func (w *withMessage) Format(s fmt.State, verb rune) {
 	switch verb {
@@ -267,3 +268,29 @@ func Cause(err error) error {
 	}
 	return err
 }
+
+// SecondCauseMsg get error second stack msg.
+func SecondCauseMsg(err error) string {
+	type causer interface {
+		Cause() error
+	}
+
+	second := err
+	for err != nil {
+		cause, ok := err.(causer)
+		if !ok {
+			break
+		}
+		second, err = err, cause.Cause()
+	}
+	// return second
+
+	type msger interface {
+		Msg() string
+	}
+	msg, ok := second.(msger)
+	if !ok {
+		return second.Error()
+	}
+	return msg.Msg()
+}

From 633b6e9e1984e408ad4325b14dff9cc00c57b144 Mon Sep 17 00:00:00 2001
From: james <jamesfan1010@gmail.com>
Date: Wed, 22 Mar 2017 11:08:55 +0800
Subject: [PATCH 2/2] remove note

---
 errors.go | 1 -
 1 file changed, 1 deletion(-)

diff --git a/errors.go b/errors.go
index e9143694..de6570de 100644
--- a/errors.go
+++ b/errors.go
@@ -283,7 +283,6 @@ func SecondCauseMsg(err error) string {
 		}
 		second, err = err, cause.Cause()
 	}
-	// return second
 
 	type msger interface {
 		Msg() string