rb_enc_symname_p  245 include/ruby/encoding.h int rb_enc_symname_p(const char*, rb_encoding*);
rb_enc_symname_p 9283 string.c       	!rb_enc_symname_p(ptr, enc) || !sym_printable(ptr, ptr + len, enc)) {
rb_enc_symname_p  192 symbol.c           return rb_enc_symname_p(name, rb_ascii8bit_encoding());