env_has_key      4385 hash.c             rb_define_singleton_method(envtbl,"include?", env_has_key, 1);
env_has_key      4386 hash.c             rb_define_singleton_method(envtbl,"member?", env_has_key, 1);
env_has_key      4387 hash.c             rb_define_singleton_method(envtbl,"has_key?", env_has_key, 1);
env_has_key      4389 hash.c             rb_define_singleton_method(envtbl,"key?", env_has_key, 1);