dest_res_selectres_quanLib.dest_res_select : term -> (term # term # term)
Breaks apart a restricted choice quantified term into the quantified variable, predicate and body.
dest_res_select is a term destructor for restricted
choice quantification:
dest_res_select "@var::P. t"
returns ("var","P","t").
Fails with dest_res_select if the term is not a
restricted choice quantification.