'Merge two abstract states.
:param VariableRecoveryState other: The other abstract state to merge.
:return:                            The merged abstract state.
:rtype:                             VariableRecoveryState'

def merge(self, other):

    merged_concrete_states = [self._concrete_states[0]]
    new_stack_region = self.stack_region.copy()
    new_stack_region.merge(other.stack_region)
    new_register_region = self.register_region.copy()
    new_register_region.merge(other.register_region)
    return VariableRecoveryState(self.variable_manager, self.arch, self.func_addr, merged_concrete_states, stack_region=new_stack_region, register_region=new_register_region)
