str_upto_each    3818 string.c       static VALUE str_upto_each(VALUE beg, VALUE end, int excl, int (*each)(VALUE, VALUE), VALUE);
str_upto_each    3866 string.c           return str_upto_each(beg, end, RTEST(exclusive), str_upto_i, Qnil);
str_upto_each    3999 string.c           str_upto_each(beg, end, RTEST(exclusive), include_range_i, (VALUE)&val);