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go
golang
Commits
04f3cf0f
Commit
04f3cf0f
authored
May 24, 2012
by
David Symonds
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flag: include flag name in redefinition panic.
R=golang-dev, rsc, r CC=golang-dev
https://golang.org/cl/6250043
parent
5a043de7
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flag.go
src/pkg/flag/flag.go
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src/pkg/flag/flag.go
View file @
04f3cf0f
...
...
@@ -620,8 +620,9 @@ func (f *FlagSet) Var(value Value, name string, usage string) {
flag
:=
&
Flag
{
name
,
usage
,
value
,
value
.
String
()}
_
,
alreadythere
:=
f
.
formal
[
name
]
if
alreadythere
{
fmt
.
Fprintf
(
f
.
out
(),
"%s flag redefined: %s
\n
"
,
f
.
name
,
name
)
panic
(
"flag redefinition"
)
// Happens only if flags are declared with identical names
msg
:=
fmt
.
Sprintf
(
"%s flag redefined: %s"
,
f
.
name
,
name
)
fmt
.
Fprintln
(
f
.
out
(),
msg
)
panic
(
msg
)
// Happens only if flags are declared with identical names
}
if
f
.
formal
==
nil
{
f
.
formal
=
make
(
map
[
string
]
*
Flag
)
...
...
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