From 0bf1f02ed921ec2f78b27f133e7a688d3e8fa82e Mon Sep 17 00:00:00 2001
From: LE Manh Cuong <cuong.manhle.vn@gmail.com>
Date: Sun, 5 May 2019 23:20:26 +0700
Subject: errors: fix Is panics if target is uncomparable

Fixes #31841

Change-Id: I3f068686154fd2fa5755b0df47b4eaa5c9a19107
Reviewed-on: https://go-review.googlesource.com/c/go/+/175260
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
---
 src/errors/wrap.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/errors/wrap.go')

diff --git a/src/errors/wrap.go b/src/errors/wrap.go
index 04ddf79ba3..69dd9464ec 100644
--- a/src/errors/wrap.go
+++ b/src/errors/wrap.go
@@ -51,8 +51,10 @@ func Is(err, target error) bool {
 	if target == nil {
 		return err == target
 	}
+
+	isComparable := target == nil || reflectlite.TypeOf(target).Comparable()
 	for {
-		if err == target {
+		if isComparable && err == target {
 			return true
 		}
 		if x, ok := err.(interface{ Is(error) bool }); ok && x.Is(target) {
-- 
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