From 8691f90cc53f1ebcd27d82c71432ca873a3744ca Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@golang.org>
Date: Tue, 9 Apr 2013 10:17:35 -0700
Subject: [PATCH] io: document non-guarantees of io.Closer

R=r, golang-dev
CC=golang-dev
https://golang.org/cl/8575043
---
 src/pkg/io/io.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pkg/io/io.go b/src/pkg/io/io.go
index 23d05e575a..f901afe423 100644
--- a/src/pkg/io/io.go
+++ b/src/pkg/io/io.go
@@ -70,6 +70,9 @@ type Writer interface {
 }
 
 // Closer is the interface that wraps the basic Close method.
+//
+// The behavior of Close after the first call is undefined.
+// Specific implementations may document their own behavior.
 type Closer interface {
 	Close() error
 }
-- 
2.50.0