Parameter MakeBackendIO.B

val init_backend : unit -> unit
type backend_context
val make_context : Shared_ast.decl_ctx -> backend_context
type vc_encoding
val print_encoding : vc_encoding -> string
type model
type solver_result =
  1. | ProvenTrue
  2. | ProvenFalse of model option
  3. | Unknown
val solve_vc_encoding : backend_context -> vc_encoding -> solver_result
val print_model : backend_context -> model -> string
val is_model_empty : model -> bool