generic-session-types 0.1.1

Generic session types in Rust for async send recv channel
Documentation 
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use std::marker::PhantomData;

pub struct Close;
pub struct IntoRaw;
pub struct Recv<T, P>(PhantomData<(T, P)>);
pub struct Send<T, P>(PhantomData<(T, P)>);
pub struct Choose<P, Q>(PhantomData<(P, Q)>);
pub struct Offer<P, Q>(PhantomData<(P, Q)>);
pub struct Rec<P>(PhantomData<P>);
pub struct Var<N>(PhantomData<N>);
pub struct Z;
pub struct S<N>(PhantomData<N>);

pub trait HasDual {
    type Dual: HasDual;
}

impl HasDual for Close {
    type Dual = Close;
}

impl HasDual for IntoRaw {
    type Dual = IntoRaw;
}

impl<T, P: HasDual> HasDual for Recv<T, P> {
    type Dual = Send<T, P::Dual>;
}

impl<T, P: HasDual> HasDual for Send<T, P> {
    type Dual = Recv<T, P::Dual>;
}

impl<P: HasDual, Q: HasDual> HasDual for Choose<P, Q> {
    type Dual = Offer<P::Dual, Q::Dual>;
}

impl<P: HasDual, Q: HasDual> HasDual for Offer<P, Q> {
    type Dual = Choose<P::Dual, Q::Dual>;
}

impl HasDual for Var<Z> {
    type Dual = Var<Z>;
}

impl<N> HasDual for Var<S<N>> {
    type Dual = Var<S<N>>;
}

impl<P: HasDual> HasDual for Rec<P> {
    type Dual = Rec<P::Dual>;
}