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flag: include flag name in redefinition panic. 

R=golang-dev, rsc, r
CC=golang-dev
https://golang.org/cl/6250043
This commit is contained in:
David Symonds 2012-05-24 13:42:02 +10:00
parent 5a043de746
commit 04f3cf0faa
1 changed files with 3 additions and 2 deletions
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5
src/pkg/flag/flag.go
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@ -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)