Function mk_coroutine_obligations

fn mk_coroutine_obligations(
    genv: GlobalEnv<'_, '_>,
    generator_did: &DefId,
    resume_ty: &Ty,
    upvar_tys: &List<Ty>,
    opaque_def_id: &DefId,
) -> InferResult<Vec<Binder<CoroutineObligPredicate>>>