# Write code in `template` to parse the argument `arg_name` to this parameter type
	private fun gen_arg_convert(template: Template, arg_name: String)
	do
		if self.name == "String" or self.name == "nullable String" then
			# String are used as is
			template.add """
			var out_{{{arg_name}}} = in_{{{arg_name}}}
"""
		else
			# Deserialize everything else
			template.add """
			var out_{{{arg_name}}} = deserialize_arg(in_{{{arg_name}}}, "{{{self.name}}}")
"""
		end
	end