Add a test to cover corner cases in add_predicate
#1305
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The
Instances
module does not handle ground predicates the same way as other predicates. These corner cases are not covered by our non-regression tests (add an assertion if you do not believe me).This PR adds a test in AE format to cover these cases.
Note that we cannot cover them with a SMT format test, as we do not differentiate functions and predicates in
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for this format.