private final List<ModelBinding> inputBindings;

    public RuleBinder(BindingPredicate subjectReference, List<BindingPredicate> inputReferences, ModelAction action, Collection<RuleBinder> binders) {
        this.action = action;
        this.inputReferences = inputReferences;
        this.binders = binders;
        this.subjectBinding = binding(subjectReference, action.getDescriptor(), true, new Action<ModelBinding>() {
            @Override

    }

    private BindingPredicate mapSubject(ModelReference<?> subjectReference, ModelActionRole role) {
        if (!role.isSubjectViewAvailable() && !subjectReference.isUntyped()) {
            throw new IllegalStateException(String.format("Cannot bind subject '%s' to role '%s' because it is targeting a type and subject types are not yet available in that role", subjectReference, role));
        }