From: Agniva De Sarker <agnivade@yahoo.co.in>
Date: Mon, 11 Nov 2019 06:32:56 +0000 (+0530)
Subject: flag: clarify that a flag cannot be re-defined
X-Git-Tag: go1.14beta1~258
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=e9f8d676ae40b0ce35efb5838eec560f7b6cf1fc;p=gostls13.git

flag: clarify that a flag cannot be re-defined

Fixes #31694

Change-Id: Ifb2ad2dc41c449668c0f6a4d4cfb9b583e5591f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/206126
Reviewed-by: Rob Pike <r@golang.org>
---

diff --git a/src/flag/flag.go b/src/flag/flag.go
index 9fed4d82b3..6a51617524 100644
--- a/src/flag/flag.go
+++ b/src/flag/flag.go
@@ -314,6 +314,9 @@ const (
 
 // A FlagSet represents a set of defined flags. The zero value of a FlagSet
 // has no name and has ContinueOnError error handling.
+//
+// Flag names must be unique within a FlagSet. An attempt to define a flag whose
+// name is already in use will cause a panic.
 type FlagSet struct {
 	// Usage is the function called when an error occurs while parsing flags.
 	// The field is a function (not a method) that may be changed to point to