fact: Axiom add_test_constraint_left_monotonic_none : forall neg v1 v2 v1' v2' v, add_test_constraint_left neg v1 v2 = Some v -> thinner v1 v1' -> thinner v2 v2' -> ~add_test_constraint_left neg v1' v2' = None.
imports: syntax little denot Bool List String ZArith axiom