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flag: allows multiple settings of a flag; should be an error #8960

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robpike opened this issue Oct 19, 2014 · 2 comments
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flag: allows multiple settings of a flag; should be an error #8960

robpike opened this issue Oct 19, 2014 · 2 comments
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Go1.4

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@robpike
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robpike commented Oct 19, 2014 

package main

import "flag"

var x = flag.String("x", "xxx", "")

func main() {
    flag.Parse()
    println(*x)
}

Run this as

foo -x x -x y

and it will print y.
@gopherbot
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Comment 1:

CL https://golang.org/cl/156390043 mentions this issue.

@robpike
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robpike commented Oct 19, 2014

Comment 2:

This issue was closed by revision 8c29633.

Status changed to Fixed.

@robpike robpike self-assigned this Oct 19, 2014
@rsc rsc added this to the Go1.4 milestone Apr 14, 2015
@rsc rsc removed the release-go1.4 label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 25, 2016
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jun 25, 2018
@robpike @wheatman
flag: disallow setting flags multiple times
f954710 
This is a day 1 error in the flag package: It did not check
that a flag was set at most once on the command line.
Because user-defined flags may have more general
properties, the check applies only to the standard flag
types in this package: bool, string, etc.

Fixes golang#8960.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/156390043
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jun 26, 2018
@robpike @wheatman
flag: disallow setting flags multiple times
2df8677 
This is a day 1 error in the flag package: It did not check
that a flag was set at most once on the command line.
Because user-defined flags may have more general
properties, the check applies only to the standard flag
types in this package: bool, string, etc.

Fixes golang#8960.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/156390043
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jul 9, 2018
@robpike @wheatman
flag: disallow setting flags multiple times
547d94e 
This is a day 1 error in the flag package: It did not check
that a flag was set at most once on the command line.
Because user-defined flags may have more general
properties, the check applies only to the standard flag
types in this package: bool, string, etc.

Fixes golang#8960.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/156390043
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jul 30, 2018
@robpike @wheatman
flag: disallow setting flags multiple times
7bfdc93 
This is a day 1 error in the flag package: It did not check
that a flag was set at most once on the command line.
Because user-defined flags may have more general
properties, the check applies only to the standard flag
types in this package: bool, string, etc.

Fixes golang#8960.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/156390043
@rsc rsc unassigned robpike Jun 23, 2022
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