fn initLockedStderr(ev: *Evented, terminal_mode: ?Io.Terminal.Mode) Io.Cancelable!Io.LockedStderr
fn initLockedStderr(ev: *Evented, terminal_mode: ?Io.Terminal.Mode) Io.Cancelable!Io.LockedStderr { ev.init_stderr_writer.once(ev, &initStderrWriter); return .{ .file_writer = &ev.stderr_writer, .terminal_mode = terminal_mode orelse ev.stderr_mode, }; }