split_once() t 0xf22091b0 0xf2209198 .f 80000000 80000000 20000000000 .split_once() .result = foo bar .BufLineReader 1 [foo ] 2 [bar ] 3 [leftover] 4 [] 5 [] .stdout isatty() = 0 stdin isatty() = 0 files_test Oils Source Code ================ [](https://github.com/oilshell/oil/actions/workflows/all-builds.yml) <a href="https://gitpod.io/from-referrer/"> files_test DONE stdout..c = h c = i . Total: 8 tests (1535 ticks, 0.002 sec), 29 assertions Pass: 8, fail: 0, skip: 0.