[m-rev.] diff: clean up typeclass parsing

[Julien Fischer]

On Wed, 6 Apr 2005, Mark Brown wrote:

> Hi all,
>
> This is in preparation for parsing functional dependencies in the form
> that was recently discussed on the developers list.
>
> Cheers,
> Mark.
>
> Estimated hours taken: 3
> Branches: main
>
> compiler/prog_io_typeclass.m:
> 	Clean up the code for parsing typeclass constraints a bit.  This
> 	also fixes a bug whereby inst constraints on typeclass declarations
> 	were being silently ignored.
>
> tests/invalid/Mmakefile:
> tests/invalid/typeclass_test_11.err_exp:
> tests/invalid/typeclass_test_11.m:
> 	A new test case.
>
That looks fine.

Julien.
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