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