ref_hash         3683 ext/date/date_core.c #define ref_hash(k) rb_hash_aref(hash, ID2SYM(rb_intern(k)))
ref_hash           41 ext/date/date_parse.c #define ref_hash(k) rb_hash_aref(hash, ID2SYM(rb_intern(k)))
ref_hash          117 ext/date/date_strptime.c #define ref_hash(k) rb_hash_aref(hash, ID2SYM(rb_intern(k)))