writable         1195 ext/stringio/stringio.c     struct StringIO *ptr = writable(self);
writable         1268 ext/stringio/stringio.c     struct StringIO *ptr = writable(self);
writable         1453 ext/stringio/stringio.c     VALUE string = writable(self)->string;
writable         11964 io.c               rb_readwrite_syserr_fail(writable, errno, mesg);
writable         11972 io.c               if (writable == RB_IO_WAIT_WRITABLE) {
writable         11989 io.c               else if (writable == RB_IO_WAIT_READABLE) {
writable         12007 io.c           	rb_bug("invalid read/write type passed to rb_readwrite_sys_fail: %d", writable);