rb_sym_intern_ascii 1389 internal.h     VALUE rb_sym_intern_ascii(const char *ptr, long len);
rb_sym_intern_ascii 1395 internal.h     	rb_sym_intern_ascii((ptr), (long)strlen(ptr)) : \
rb_sym_intern_ascii 1052 symbol.c           return rb_sym_intern_ascii(ptr, strlen(ptr));