IDISJ-LEFT-TAC : TACTIC

IDISJ-LEFT-TAC is a tactic.
As defined for use ETREE-NAT: is a primitive tactic.
If planned line corresponds to a disjunction, and the right disjunct
is inessential, infers the planned line from the left disjunct by RuleP.
Same as Pfenning's tactic 188.

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