val push_level : t -> unit
Create a new backtrack level
val pop_levels : t -> int -> unit
n levels of the theory
Assume the formulas in the slice, possibly using the
slice to push new formulas to be propagated or to raising a conflict or to add new lemmas.
Called at the end of the search in case a model has been found. If no new clause is pushed, then proof search ends and "sat" is returned; if lemmas are added, search is resumed; if a conflict clause is added, search backtracks and then resumes.
An iterator over the subTerm.ts of a Formula.t that should be assigned a value (usually the poure subTerm.ts)