Create forward references for all circular references
        :return:

def resolve_circular_references(self) -> None:
        """
        Create forward references for all circular references
        :return:
        """
        circulars = self.circular_references()
        for c in circulars:
            fwdref = JSGForwardRef(c)
            self.grammarelts[fwdref.label] = fwdref
            self.forward_refs[c] = fwdref.label