unreachable!() statement is reachable

[matthiasbeyer]

This line:

https://github.com/mitsuhiko/indicatif/blob/6a49439748cae10785cc0ec16d8e79af5e4dd47f/src/state.rs#L456

is reachable. I just hit it with the following backtrace:

thread 'main' panicked at 'internal error: entered unreachable code', /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/state.rs:456:47
stack backtrace:                                                        
   0: rust_begin_unwind                     
             at /rustc/2fd73fabe469357a12c2c974c140f67e7cdd76d0/library/std/src/panicking.rs:493:5    
   1: core::panicking::panic_fmt                                                                                                                              
             at /rustc/2fd73fabe469357a12c2c974c140f67e7cdd76d0/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/2fd73fabe469357a12c2c974c140f67e7cdd76d0/library/core/src/panicking.rs:50:5
   3: indicatif::state::ProgressDrawTarget::width
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/state.rs:456:47
   4: indicatif::state::MultiProgressState::width
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/state.rs:275:9
   5: indicatif::state::ProgressDrawTarget::width
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/state.rs:455:65
   6: indicatif::state::ProgressState::width
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/state.rs:84:9
   7: indicatif::style::ProgressStyle::format_state
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/style.rs:299:35
   8: indicatif::state::ProgressState::draw
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/state.rs:236:17
   9: indicatif::state::ProgressState::update_and_draw
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/state.rs:124:13
  10: indicatif::progress_bar::ProgressBar::update_and_draw
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/progress_bar.rs:481:9
  11: indicatif::progress_bar::ProgressBar::set_length
             at /home/m/.cargo/registry/src/github.com-1ecc6299db9ec823/indicatif-0.16.0/src/progress_bar.rs:286:9

[djc]

This was fixed in #286.