[m-rev.] For review: allow unifications to be delayed across impure goals

[Zoltan Somogyi]

On 12-Oct-2005, Ralph Becket <rafe at cs.mu.OZ.AU> wrote:
> refer to any hidden state.  That leaves equality tests (so called
> complex unifications) which, if they mention arguments to the impure
> call, can only appear as implied modes

That is not true. A complex unification may involve terms of types with
user-defined equality such as solver types, whose implementation, while
presenting a pure interface, is impure.

Zoltan.
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