darcs patch: add negative-prim-literal tests (and 2 more)

[Isaac Dupree]

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Neil Mitchell wrote:
> Hi
> 
>> Okay, what is the meaning of this error I'm getting repeatedly, trying
>> to push the testsuite patches:
>>
>> Waiting for lock /srv/darcs/testsuite/_darcs/lock
>> Waiting for lock /srv/darcs/testsuite/_darcs/lock
> 
> Usually means you ran a darcs push and aborted before the end. If you
> aren't running darcs at the moment, then just rm _darcs/lock.

I don't think I did that (though there was a bit of a wait before I
answered yes/no on which patches I wanted to push)...  I guess maybe
someone else did, but what if there's a reason for the lock still to be
there (non-local repos are trickier...)

Isaac
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