[mercury-users] type class bug?

Julien Fischer juliensf at cs.mu.OZ.AU
Thu Jun 22 13:36:49 AEST 2006

On Thu, 22 Jun 2006, Mark Brown wrote:

> It's a known limitation in the typeclass system when using equivalence
> types.  Unfortunately, Julien's suggestion won't work because of another
> limitation: the arguments of instances must be of the form foo(A, B, ...).
> Try defining the above types as:
> 	:- type type_expr ---> raw_type_expr - src_locn.
> 	:- type expr ---> raw_expr - src_locn.
> Or something similar using a better constructor than '-'/2.
Defintely use a better constructor than '-'. That's overloaded
enough already.

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