w_symbol         227 marshal.c          w_symbol(rb_intern(s), arg);
w_symbol         248 marshal.c          w_symbol(id, arg->arg);
w_symbol         356 marshal.c      	w_symbol(SYM2ID(obj), arg);
w_symbol         513 marshal.c      		    w_symbol(SYM2ID(RARRAY(mem)->ptr[i]), arg);