strip_pforall
pairSyntax.strip_pforall : term -> term list * term
Iteratively breaks apart paired universal quantifications.
strip_pforall "!p1 ... pn. t" returns ([p1,...,pn],t). Note that
strip_pforall(list_mk_pforall([p1,...,pn],t))
will not return ([p1,...,pn],t) if t is a paired universal
quantification.
Failure
Never fails.