From 7664a472e500aa512749e58e5e171baef8d6c6b9 Mon Sep 17 00:00:00 2001
From: ono-teruya <27873650+teru01@users.noreply.github.com>
Date: Sun, 12 May 2024 17:10:09 +0900
Subject: [PATCH] fix: use unwrap

---
 errors.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/errors.go b/errors.go
index f948770..0ded8f0 100644
--- a/errors.go
+++ b/errors.go
@@ -129,7 +129,12 @@ func (x *Error) Format(s fmt.State, verb rune) {
 		if s.Flag('+') {
 			_, _ = io.WriteString(s, x.Error())
 			var c *Error
-			for c = x; c.cause != nil; c = c.cause.(*Error) {
+			for c = x; c.Unwrap() != nil; {
+				cause, ok := c.Unwrap().(*Error)
+				if !ok {
+					break
+				}
+				c = cause
 			}
 			c.st.Format(s, verb)
 			return