abstract_eqv.m:019: In clause for predicate `bad'/0:
abstract_eqv.m:019:   in argument 1 of call to predicate
abstract_eqv.m:019:   `abstract_eqv2.call_with_foo'/1:
abstract_eqv.m:019:   type error: argument has type
abstract_eqv.m:019:     abstract_eqv2.bar;
abstract_eqv.m:019:   expected type was
abstract_eqv.m:019:     abstract_eqv2.foo.
For more information, recompile with `-E'.