set_syserr       1469 error.c        	error = set_syserr(n, name);
set_syserr       2359 error.c            rb_eNOERROR = set_syserr(0, "NOERROR");
set_syserr       2360 error.c        #define defined_error(name, num) set_syserr((num), (name));
set_syserr       2361 error.c        #define undefined_error(name) set_syserr(0, (name));