split_once() t 0xb888d0 0xb888f0 .f 80000000 80000000 20000000000 .split_once() .offset of obj_len in Obj = 4 offset of obj_len in mylib::BufWriter = 12 result = foobar .BufLineReader 1 [foo ] 2 [bar ] 3 [leftover] 4 [] .stdout isatty() = 0 stdin isatty() = 0 files_test Oil Source Code =============== [![Build Status](https://github.com/oilshell/oil/actions/workflows/all-builds.yml/badge.svg)](https://github.com/oilshell/oil/actions/workflows/all-builds.yml) files_test DONE . Total: 6 tests (245 ticks, 0.000 sec), 21 assertions Pass: 6, fail: 0, skip: 0.