# Collect all methods introduced in `self` excluding inits
	#
	# See `collect_intro_inits`.
	fun collect_intro_methods(filter: nullable ModelFilter): Set[MMethod] do
		var res = new HashSet[MMethod]
		for mgroup in mgroups do
			for mmodule in collect_all_mmodules(filter) do
				res.add_all mmodule.collect_intro_methods(filter)
			end
		end
		return res
	end