Maps an inference rule over the assumptions of a goal.
DESCRIPTION
When applied to an inference rule f and a goal ({A1,...,An} ?- t),
the RULE_ASSUM_TAC tactical applies the inference rule to each of the
ASSUMEd assumptions to give a new goal.
{A1,...,An} ?- t
==================================== RULE_ASSUM_TAC f
{f(A1 |- A1),...,f(An |- An)} ?- t
FAILURE
The application of RULE_ASSUM_TAC f to a goal fails iff f fails when
applied to any of the assumptions of the goal.
COMMENTS
It does not matter if the goal has no assumptions, but in this case
RULE_ASSUM_TAC has no effect.