flag: allow non-flag arguments anywhere in a command line

[gopherbot]

by emilliken:

Currently, non-flag arguments must come after the flag arguments like:
./prog -x 1 arg1 arg2
(flag.NArg() == 2)

I'd like to be able to parse arguments like:
./prog arg1 arg2 -x 1

and have flag.NArg() return 2 instead of 4. The -x arg should also be parsed into a flag
variable.

[rsc]

Comment 1:

This was a deliberate design decision. Historically command line
option parsers did not accepted flags everywhere on the command line.
Some now do, so there are two standards that could be used. Go uses
the original one.

Status changed to WorkingAsIntended.