_ とまらないコンパイラ i@u ~/test/d> dmd functional functional.d(26): Error: 'this' is only allowed in non-static member functions, not f functional.d(26): Error: 'this' for nested class must be a class type, not int functional.d(26): Error: 'this' is only allowed in non-static member functions, not f functional.d(26): Error: 'this' for nested class must be a class type, not int functional.d(26): Error: 'th