Collect task panicked: task 57751 panicked with message "called `Result::unwrap()` on an `Err` value: JoinError::Panic(Id(57752), \"called `Result::unwrap()` on an `Err` value: JoinError::Panic(Id(57753), \\\"assertion failed: n_lines_is_correct || slice.1 == 0\\\", ...)\", ...)"

Collect task panicked: task 57751 panicked with message "called `Result::unwrap()` on an `Err` value: JoinError::Panic(Id(57752), \"called `Result::unwrap()` on an `Err` value: JoinError::Panic(Id(57753), \\\"assertion failed: n_lines_is_correct || slice.1 == 0\\\", ...)\", ...)"