From e0fed4d581392f189a6b6b55b6222956bede467c Mon Sep 17 00:00:00 2001
From: Vladimir Mihailenco <vladimir.webdev@gmail.com>
Date: Thu, 8 Aug 2019 14:04:19 +0300
Subject: [PATCH] Remove atomic.Value.Store(nil)

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

diff --git a/internal/pool/pool_single.go b/internal/pool/pool_single.go
index 3cee769b..6f85b308 100644
--- a/internal/pool/pool_single.go
+++ b/internal/pool/pool_single.go
@@ -16,6 +16,8 @@ type BadConnError struct {
 	wrapped error
 }
 
+var _ error = (*BadConnError)(nil)
+
 func (e BadConnError) Error() string {
 	return "pg: Conn is in a bad state"
 }
@@ -178,7 +180,7 @@ func (p *SingleConnPool) Reset() error {
 			return ErrClosed
 		}
 		p.pool.Remove(cn, ErrClosed)
-		p._badConnError.Store(nil)
+		p._badConnError.Store(BadConnError{wrapped: nil})
 	default:
 		return fmt.Errorf("pg: SingleConnPool does not have a Conn")
 	}
@@ -193,7 +195,10 @@ func (p *SingleConnPool) Reset() error {
 
 func (p *SingleConnPool) badConnError() error {
 	if v := p._badConnError.Load(); v != nil {
-		return v.(BadConnError)
+		err := v.(BadConnError)
+		if err.wrapped != nil {
+			return err
+		}
 	}
 	return nil
 }