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