thread 'main' panicked at $DIR/bad_unwind.rs:LL:CC:
explicit panic
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: Undefined Behavior: unwinding past a stack frame that does not allow unwinding
  --> $DIR/bad_unwind.rs:LL:CC
   |
LL |     std::panic::catch_unwind(|| unwind()).unwrap_err();
   |                                 ^^^^^^^^ unwinding past a stack frame that does not allow unwinding
   |
   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
   = note: BACKTRACE:
   = note: inside closure at $DIR/bad_unwind.rs:LL:CC
   = note: inside `std::panicking::r#try::do_call::<{closure@$DIR/bad_unwind.rs:LL:CC}, ()>` at RUSTLIB/std/src/panicking.rs:LL:CC
   = note: inside `std::panicking::r#try::<(), {closure@$DIR/bad_unwind.rs:LL:CC}>` at RUSTLIB/std/src/panicking.rs:LL:CC
   = note: inside `std::panic::catch_unwind::<{closure@$DIR/bad_unwind.rs:LL:CC}, ()>` at RUSTLIB/std/src/panic.rs:LL:CC
note: inside `main`
  --> $DIR/bad_unwind.rs:LL:CC
   |
LL |     std::panic::catch_unwind(|| unwind()).unwrap_err();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to 1 previous error