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%  Copyright 1998-2021 Paulo Moura <pmoura@logtalk.org>
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:- object(hook,
	implements(expanding)).

	% tests cases where conditionals are added or removed
	goal_expansion(one(G), (G -> true; fail)).
	goal_expansion((true -> G), G).

	goal_expansion(c(X), d(X)).
	goal_expansion(d(X), e(X)).
	goal_expansion(e(X), (c(X) -> d(X); e(X))).
	% check case where a goal to be expanded resulted from
	% a previous expansion of the same goal
	goal_expansion(f(X), (f(X) -> write(true); write(false))).

:- end_object.
