used in comment https://github.com/rust-lang/rust/pull/110975#issuecomment-2012927606

a.rs

     Running `target/debug/bisektor`

Custom panic handler starting!

Custom panic handler processing payload

Custom panic handler caught panic: not yet implemented

Panic occurred in file 'src/main.rs' at line 7

   0: bisektor::main::{{closure}}

             at ./src/main.rs:47:28

   1: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/alloc/src/boxed.rs:1999:9

   2: std::panicking::rust_panic_with_hook

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:695:13

   3: std::panicking::begin_panic_handler::{{closure}}

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:580:13

   4: std::sys_common::backtrace::__rust_end_short_backtrace

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/sys_common/backtrace.rs:151:18

   5: rust_begin_unwind

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:578:5

   6: core::panicking::panic_fmt

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/panicking.rs:67:14

   7: core::panicking::panic

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/panicking.rs:117:5

   8: <bisektor::MyStruct as core::fmt::Display>::fmt

             at ./src/main.rs:7:9

   9: core::fmt::rt::Argument::fmt

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/fmt/rt.rs:138:9

  10: core::fmt::write

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/fmt/mod.rs:1094:21

  11: core::fmt::Write::write_fmt

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/fmt/mod.rs:192:9

  12: std::panicking::begin_panic_handler::PanicPayload::fill::{{closure}}

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:544:30

  13: core::option::Option<T>::get_or_insert_with

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/option.rs:1645:26

  14: std::panicking::begin_panic_handler::PanicPayload::fill

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:542:13

  15: <std::panicking::begin_panic_handler::PanicPayload as core::panic::BoxMeUp>::get

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:560:13

  16: std::panicking::rust_panic_with_hook

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:694:30

  17: std::panicking::begin_panic_handler::{{closure}}

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:582:13

  18: std::sys_common::backtrace::__rust_end_short_backtrace

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/sys_common/backtrace.rs:151:18

  19: rust_begin_unwind

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:578:5

  20: core::panicking::panic_fmt

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/panicking.rs:67:14

  21: bisektor::main

             at ./src/main.rs:57:5

  22: core::ops::function::FnOnce::call_once

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/ops/function.rs:250:5

  23: std::sys_common::backtrace::__rust_begin_short_backtrace

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/sys_common/backtrace.rs:135:18

  24: std::rt::lang_start::{{closure}}

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/rt.rs:166:18

  25: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/core/src/ops/function.rs:284:13

  26: std::panicking::try::do_call

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:485:40

  27: std::panicking::try

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:449:19

  28: std::panic::catch_unwind

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panic.rs:142:14

  29: std::rt::lang_start_internal::{{closure}}

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/rt.rs:148:48

  30: std::panicking::try::do_call

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:485:40

  31: std::panicking::try

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panicking.rs:449:19

  32: std::panic::catch_unwind

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/panic.rs:142:14

  33: std::rt::lang_start_internal

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/rt.rs:148:20

  34: std::rt::lang_start

             at /rustc/1a5f8bce74ee432f7cc3aa131bc3d6920e06de10/library/std/src/rt.rs:165:17

  35: main

  36: __libc_start_call_main

  37: __libc_start_main@GLIBC_2.2.5

  38: _start



thread panicked while panicking. aborting.

Aborted (core dumped)

code for the above is: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2024&gist=99770fa13c2aebcd47d355a4952d7584

but was run with:

$ rustc -vV
rustc 1.71.0-nightly (1a5f8bce7 2023-05-26)
binary: rustc
commit-hash: 1a5f8bce74ee432f7cc3aa131bc3d6920e06de10
commit-date: 2023-05-26
host: x86_64-unknown-linux-gnu
release: 1.71.0-nightly
LLVM version: 16.0.4