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If within a minimization, force a check of the cost variable against
the cost bound, which may lead to earlier failure.
This predicate can be used within a goal that is being minimized
using minimize/2 or any of its variants. If used in other contexts
it has no effect just succeeds.
The behaviour of minimize/2 is such that the cost bound is tightened
whenever a better solution is found, but this tightening does not
trigger an automatic check. It can therefore be advantageous and
lead to earlier failure when minimize_bound_check/0 is called after
every labeling step.
Fails if the current cost cannot become smaller that the cost bound.
% do the check urgently, before any propagation happens
call_priority((indomain(X), minimize_bound_check), 2),
minimize / 2, minimize / 4, minimize / 6, minimize / 8