rb_enc_set_index   43 include/ruby/encoding.h #define RB_ENCODING_SET(obj,i) rb_enc_set_index((obj), (i))
rb_enc_set_index  119 include/ruby/encoding.h void rb_enc_set_index(VALUE obj, int encindex);
rb_enc_set_index  958 pack.c         	rb_enc_set_index(res, rb_utf8_encindex());
rb_enc_set_index  569 string.c           rb_enc_set_index(str1, ENCODING_GET(str2));
rb_enc_set_index 2740 string.c       		rb_enc_set_index(str, encidx);