env_keys         3439 hash.c             keys = env_keys();
env_keys         3556 hash.c             keys = env_keys();
env_keys         3628 hash.c             keys = env_keys();
env_keys         3658 hash.c             keys = env_keys();
env_keys         3704 hash.c             keys = env_keys();
env_keys         4094 hash.c             keys = env_keys();
env_keys         4382 hash.c             rb_define_singleton_method(envtbl,"keys", env_keys, 0);