thread 'main' panicked at 'panicking from libstd', $DIR/panic1.rs:8:5
stack backtrace:
   0: std::rt::begin_panic
             at RUSTLIB/$FILE:LL:COL
   1: main
             at $DIR/panic1.rs:8:5
   2: <fn() as std::ops::FnOnce<()>>::call_once - shim(fn())
             at RUSTLIB/$FILE:LL:COL
   3: std::rt::lang_start::{closure#0}
             at RUSTLIB/$FILE:LL:COL
   4: std::ops::function::impls::call_once
             at RUSTLIB/$FILE:LL:COL
   5: std::panicking::r#try::do_call
             at RUSTLIB/$FILE:LL:COL
   6: std::panicking::r#try
             at RUSTLIB/$FILE:LL:COL
   7: std::panic::catch_unwind
             at RUSTLIB/$FILE:LL:COL
   8: std::rt::lang_start_internal
             at RUSTLIB/$FILE:LL:COL
   9: std::rt::lang_start
             at RUSTLIB/$FILE:LL:COL
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.