From 57ae2e7371de9c7c5c2f6314baf95ca8b94a61d8 Mon Sep 17 00:00:00 2001
From: Shenghou Ma <minux.ma@gmail.com>
Date: Mon, 17 Dec 2012 23:37:02 +0800
Subject: [PATCH] =?utf8?q?os:=20fix=20docs=20for=20Expand=20there=20is=20n?=
 =?utf8?q?o=20concept=20of=20=E2=80=9Cundefined=E2=80=9D=20variables=20for?=
 =?utf8?q?=20Expand=E3=80=82?=
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R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6946063
---
 src/pkg/os/env.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pkg/os/env.go b/src/pkg/os/env.go
index eb265f2413..db7fc72b8a 100644
--- a/src/pkg/os/env.go
+++ b/src/pkg/os/env.go
@@ -9,7 +9,7 @@ package os
 import "syscall"
 
 // Expand replaces ${var} or $var in the string based on the mapping function.
-// Invocations of undefined variables are replaced with the empty string.
+// For example, os.ExpandEnv(s) is equivalent to os.Expand(s, os.Getenv).
 func Expand(s string, mapping func(string) string) string {
 	buf := make([]byte, 0, 2*len(s))
 	// ${} is all ASCII, so bytes are fine for this operation.
-- 
2.48.1