st_index_t         67 include/ruby/st.h #define ST_INDEX_BITS (sizeof(st_index_t) * CHAR_BIT)
st_index_t         71 include/ruby/st.h     st_index_t num_bins;
st_index_t         76 include/ruby/st.h     st_index_t num_entries : ST_INDEX_BITS - 1;