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

[Simon Marlow]

Isaac Dupree wrote:
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> Isaac Dupree wrote:
>> Unfortunately "add negative-prim-literal tests" (according to darcs)
>> depends on "#1318: pre-emptively add test for..."; either the patches
>> could be reworked, or we could just get that one reviewed and fixed up
>> first/simultaneously (see my comments in its e-mail)
> 
> I'll push these tests and ghc-patch if I don't get a reply by the end of
>  Monday June 4 (the tests work fine for me, they just seem a little odd,
> so if there's a need someone can just refactor them later)

The patches look fine, go ahead and push.

Cheers,
	Simon