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flag: clarify that a flag cannot be re-defined

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Fixes #31694

Change-Id: Ifb2ad2dc41c449668c0f6a4d4cfb9b583e5591f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/206126
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Agniva De Sarker 2019-11-11 12:02:56 +05:30 committed by Agniva De Sarker
parent 0e312f212c
commit e9f8d676ae
1 changed files with 3 additions and 0 deletions
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3
src/flag/flag.go
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@ -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