Repository: Rapptz/discord.py
File: discord/ext/commands/cog.py (Python)

Code before:
    def bot_check(self, ctx: Context[BotT]) -> bool:
        """A special method that registers as a :meth:`.Bot.check`
        check.

        This function **can** be a coroutine and must take a sole parameter,
        ``ctx``, to represent the :class:`.Context`.
        """
        return True

    @_cog_special_method
    def cog_check(self, ctx: Context[BotT]) -> bool:
        """A special method that registers as a :func:`~discord.ext.commands.check`
        for every command and subcommand in this cog.

        This function **can** be a coroutine and must take a sole parameter,
        ``ctx``, to represent the :class:`.Context`.
        """
        return True

    @_cog_special_method
    def interaction_check(self, interaction: discord.Interaction[BotT], /) -> bool:
        """A special method that registers as a :func:`discord.app_commands.check`
        for every app command and subcommand in this cog.

        This function **can** be a coroutine and must take a sole parameter,
        ``interaction``, to represent the :class:`~discord.Interaction`.
        """
        return True

    @_cog_special_method
    async def cog_command_error(self, ctx: Context[BotT], error: Exception) -> None:
        """|coro|

        A special method that is called whenever an error
        is dispatched inside this cog.

        This is similar to :func:`.on_command_error` except only applying
        to the commands inside this cog.

        This **must** be a coroutine.

        Parameters
        -----------
        ctx: :class:`.Context`
            The invocation context where the error happened.
        error: :class:`CommandError`
            The error that happened.
        """
        pass

    @_cog_special_method

Review comment (suggestion):
```suggestion
        This function **must** be a coroutine and must take a sole parameter,
```

Code after:
    @_cog_special_method
    def bot_check(self, ctx: Context[BotT]) -> bool:
        """A special method that registers as a :meth:`.Bot.check`
        check.

        This function **can** be a coroutine and must take a sole parameter,
        ``ctx``, to represent the :class:`.Context`.
        """
        return True

    @_cog_special_method
    def cog_check(self, ctx: Context[BotT]) -> bool:
        """A special method that registers as a :func:`~discord.ext.commands.check`
        for every command and subcommand in this cog.

        This function **can** be a coroutine and must take a sole parameter,
        ``ctx``, to represent the :class:`.Context`.
        """
        return True

    @_cog_special_method
    def interaction_check(self, interaction: discord.Interaction[ClientT], /) -> bool:
        """A special method that registers as a :func:`discord.app_commands.check`
        for every app command and subcommand in this cog.

        This function **can** be a coroutine and must take a sole parameter,
        ``interaction``, to represent the :class:`~discord.Interaction`.

        .. versionadded:: 2.0
        """
        return True

    @_cog_special_method
    async def cog_command_error(self, ctx: Context[BotT], error: Exception) -> None:
        """|coro|

        A special method that is called whenever an error
        is dispatched inside this cog.

        This is similar to :func:`.on_command_error` except only applying
        to the commands inside this cog.

        This **must** be a coroutine.

        Parameters
        -----------
        ctx: :class:`.Context`
            The invocation context where the error happened.
        error: :class:`CommandError`
            The error that happened.
        """