RHASH_IFNONE     1050 include/ruby/ruby.h #define RHASH_IFNONE(h) rb_hash_ifnone(h)
RHASH_IFNONE      567 internal.h     #undef RHASH_IFNONE
RHASH_IFNONE      570 internal.h     #define RHASH_IFNONE(h) (RHASH(h)->ifnone)