private fun check_signature(modelbuilder: ModelBuilder, mclassdef: MClassDef): Bool
	do
		var res = true
		for np in self.n_params do
			var ntype = np.n_type
			if ntype != null then
				if modelbuilder.resolve_mtype(mclassdef, ntype) == null then
					res = false
				end
			end
		end
		var ntype = self.n_type
		if ntype != null then
			if modelbuilder.resolve_mtype(mclassdef, ntype) == null then
				res = false
			end
		end
		if not res then is_broken = true
		return res
	end