|| Не может быть производен как расширение дважды.

{type	trait_t
	{subclassing_by_extension}
}

{type	timeout_trait_t
	{subclassing_by_extension
		{extension_of trait_t}
		{extension_of trait_t}}
}

{type	compression_trait_t
	{subclassing_by_extension
		{extension_of trait_t}}
}

{type	signature_trait_t
	{subclassing_by_extension
		{extension_of trait_t}}
}

