1 thread 'main' panicked at 'panicking from libstd', $DIR/panic1.rs:LL:CC
3 0: std::rt::begin_panic
4 at RUSTLIB/std/src/panicking.rs:LL:CC
6 at $DIR/panic1.rs:LL:CC
7 2: <fn() as std::ops::FnOnce<()>>::call_once - shim(fn())
8 at RUSTLIB/core/src/ops/function.rs:LL:CC
9 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.