[mercury-users] existential types

[Michael Day]

> It also succeeds with rotd-2002-03-30, so no.
> As always, it would help if you posted a complete compilable
> example demonstrating your problem.

Sorry about that, my mistake. Appears that node(T) and doc(T) were defined 
as public equivalence types:

:- type node(T) == node.

which was causing the error.

Michael

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