- Fixed bug in mk_split_pack which caused application of expansion theorem
to fail because of typing reasons
- Rewrote inst_lift and inst_split: now cterm_instantiate is used to
instantiate theorems
List = FOL +
types list 1
arities list :: (term)term
consts Nil :: "'a list"
Cons :: "['a, 'a list] => 'a list"
end