Optlang: non-saturated call case
Optlang: Prove optl_eval determinacy
Optlang: Add predicate for well-formed label references
Optlang: Work on weaving in contains_expr condition
Optlang: Some progress on saturated call case
Optlang: Update refs bound lemma
Optlang: Match up form of refs_bounded lemmas with contains_def etc.
Optlang: Work on nested_run proof
Optlang: Finish proving nested_run