/*#[derive(Clone, Copy, Eq, Hash, PartialEq)]
pub enum ProofDirection
{
	Forward,
	Backward,
}

#[derive(Eq, Hash, PartialEq)]
pub enum CompletionTarget
{
	Predicate(std::rc::Rc<foliage::PredicateDeclaration>),
	Constraint,
}

pub struct CompletionFormula
{
	pub target: CompletionTarget,
	pub formula: foliage::Formula,
}

pub struct Lemma
{
	pub direction: Option<ProofDirection>,
	pub formula: foliage::Formula,
}

pub struct Specification
{
	pub axioms: foliage::Formulas,
	pub lemmas: Vec<Lemma>,
	pub assumptions: foliage::Formulas,
	pub assertions: foliage::Formulas,

	pub input_constants: foliage::FunctionDeclarations,
	pub input_predicates: foliage::PredicateDeclarations,
}*/