fact: Definition refineEquiv_split_func_ex : forall A B (P : A -> Prop) (f : A -> B), @refineEquiv _ { b | exists a, P a /\ b = f a}%comp (a <- { a | P a}; ret (f a))%comp.
imports: Coq.Strings.String Coq.Sets.Ensembles Coq.Bool.Bool Fiat.Common Fiat.Common.BoolFacts Fiat.Common.LogicFacts Fiat.Computation.Core Fiat.Computation.Monad Fiat.Computation.SetoidMorphisms Fiat.Computation.Refinements.Tactics