thread 'main' panicked at 'debug!!!', $DIR/short-ice-remove-middle-frames-2.rs:56:5
stack backtrace:
   0: std::panicking::begin_panic
   1: short_ice_remove_middle_frames_2::eight
   2: short_ice_remove_middle_frames_2::seven::{{closure}}
   3: short_ice_remove_middle_frames_2::fifth
   4: short_ice_remove_middle_frames_2::fourth::{{closure}}
   5: short_ice_remove_middle_frames_2::first
   6: short_ice_remove_middle_frames_2::main
   7: core::ops::function::FnOnce::call_once
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.