How to use the pluggy.hooks.HookImpl function in pluggy

def call_extra(self, methods, kwargs):
        """ Call the hook with some additional temporarily participating
        methods using the specified kwargs as call parameters. """
        old = list(self._nonwrappers), list(self._wrappers)
        for method in methods:
            opts = dict(hookwrapper=False, trylast=False, tryfirst=False)
            hookimpl = HookImpl(None, "", method, opts)
            self._add_hookimpl(hookimpl)
        try:
            return self(**kwargs)
        finally:
            self._nonwrappers, self._wrappers = old

def MC(methods, kwargs, firstresult=False):
    hookfuncs = []
    for method in methods:
        f = HookImpl(None, "", method, method.example_impl)
        hookfuncs.append(f)
    return _multicall(hookfuncs, kwargs, firstresult=firstresult)

def wrap(func):
            hookimpl(tryfirst=tryfirst, trylast=trylast, hookwrapper=hookwrapper)(func)
            hc._add_hookimpl(HookImpl(None, "", func, func.example_impl))
            return func

"Plugin already registered: %s=%s\n%s"
                % (plugin_name, plugin, self._name2plugin)
            )

        # XXX if an error happens we should make sure no state has been
        # changed at point of return
        self._name2plugin[plugin_name] = plugin

        # register matching hook implementations of the plugin
        self._plugin2hookcallers[plugin] = hookcallers = []
        for name in dir(plugin):
            hookimpl_opts = self.parse_hookimpl_opts(plugin, name)
            if hookimpl_opts is not None:
                normalize_hookimpl_opts(hookimpl_opts)
                method = getattr(plugin, name)
                hookimpl = HookImpl(plugin, plugin_name, method, hookimpl_opts)
                hook = getattr(self.hook, name, None)
                if hook is None:
                    hook = _HookCaller(name, self._hookexec)
                    setattr(self.hook, name, hook)
                elif hook.has_spec():
                    self._verify_hook(hook, hookimpl)
                    hook._maybe_apply_history(hookimpl)
                hook._add_hookimpl(hookimpl)
                hookcallers.append(hook)
        return plugin_name

def MC(methods, kwargs, firstresult=False):
    caller = _multicall
    hookfuncs = []
    for method in methods:
        f = HookImpl(None, "", method, method.example_impl)
        hookfuncs.append(f)
    return caller("foo", hookfuncs, kwargs, firstresult)