sym_encoding      166 io.c           static VALUE sym_mode, sym_perm, sym_flags, sym_extenc, sym_intenc, sym_encoding, sym_open_args;
sym_encoding     5151 io.c           	v = rb_hash_lookup2(opt, sym_encoding, Qnil);
sym_encoding     12502 io.c               sym_encoding = ID2SYM(rb_id_encoding());
sym_encoding     9830 string.c           rb_define_method(rb_cSymbol, "encoding", sym_encoding, 0);