Hi all,
I found that std.flag require noname-flag support.
For example: 
"ping 127.0.0.1 -n 2" and "ping 127.0.0.1 /n 2" 
are legal windows "ping" command line usages, but std.flag does not support 
these formats.
Moreover, I found std.flag has a suspect BUG:
I think "ping 127.0.0.1 -n = 2" or "ping 127.0.0.1 -n= 2" or "ping 
127.0.0.1 -n =2"
are possibly legal usages of command line, but unfortunately std.flag will 
cause panic.

So, I have solved these problems in my cmdline project:
https://github.com/vipally/cmdline

And, I hope std.flag can consider these requirements and allow merge the 
feature changes.
You can see my detail test case at:
https://github.com/vipally/cmdline/blob/master/flag_test.go
I hope std.falg can take these cases PASS one day.
Thanks all.

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