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

b.rs

warning: `bisektor` (bin "bisektor") generated 3 warnings (run `cargo fix --bin "bisektor"` to apply 1 suggestion)

    Finished dev [unoptimized + debuginfo] target(s) in 0.22s

     Running `target/debug/bisektor`

thread 'main' panicked at 'not yet implemented', src/main.rs:7:9

stack backtrace:

   0:     0x557af2db7bb1 - std::backtrace_rs::backtrace::libunwind::trace::h354e40c56b67c8e6

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5

   1:     0x557af2db7bb1 - std::backtrace_rs::backtrace::trace_unsynchronized::hf1b6468233aaab71

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5

   2:     0x557af2db7bb1 - std::sys_common::backtrace::_print_fmt::h43d089873eb4d258

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/sys_common/backtrace.rs:65:5

   3:     0x557af2db7bb1 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h286cd35e7fbdc2ee

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/sys_common/backtrace.rs:44:22

   4:     0x557af2dd369f - core::fmt::rt::Argument::fmt::h2ac2593b777ffd2c

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/fmt/rt.rs:138:9

   5:     0x557af2dd369f - core::fmt::write::h7799eae953805876

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/fmt/mod.rs:1094:21

   6:     0x557af2db5ed1 - std::io::Write::write_fmt::ha468a4088257e599

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/io/mod.rs:1712:15

   7:     0x557af2db79c5 - std::sys_common::backtrace::_print::h1008c8e3677cfeed

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/sys_common/backtrace.rs:47:5

   8:     0x557af2db79c5 - std::sys_common::backtrace::print::hd6c777ef22d61014

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/sys_common/backtrace.rs:34:9

   9:     0x557af2db8d47 - std::panicking::default_hook::{{closure}}::h86359589176e1dc7

  10:     0x557af2db8b34 - std::panicking::default_hook::hc6b12c32be7f2269

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:288:9

  11:     0x557af2db9201 - std::panicking::rust_panic_with_hook::h07a345046772cd1e

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:691:13

  12:     0x557af2db90b1 - std::panicking::begin_panic_handler::{{closure}}::h84a5e74b0ac7bfd9

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:580:13

  13:     0x557af2db7fe6 - std::sys_common::backtrace::__rust_end_short_backtrace::hfab653505a2c6309

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/sys_common/backtrace.rs:151:18

  14:     0x557af2db8e42 - rust_begin_unwind

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:578:5

  15:     0x557af2d9ee73 - core::panicking::panic_fmt::hbffcbe9cdfcee218

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/panicking.rs:67:14

  16:     0x557af2d9ef03 - core::panicking::panic::h6efaa5b1773f8c89

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/panicking.rs:117:5

  17:     0x557af2d9f5da - <bisektor::MyStruct as core::fmt::Display>::fmt::h6af5799ea34afa39

                               at /home/user/sandbox/bisektor/src/main.rs:7:9

  18:     0x557af2dd369f - core::fmt::rt::Argument::fmt::h2ac2593b777ffd2c

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/fmt/rt.rs:138:9

  19:     0x557af2dd369f - core::fmt::write::h7799eae953805876

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/fmt/mod.rs:1094:21

  20:     0x557af2db8f7d - core::fmt::Write::write_fmt::h99bbfb76de46b19a

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/fmt/mod.rs:192:9

  21:     0x557af2db8f7d - std::panicking::begin_panic_handler::PanicPayload::fill::{{closure}}::h253e7995b6934476

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:544:30

  22:     0x557af2db8f7d - core::option::Option<T>::get_or_insert_with::hc69a28ff65f4aa41

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/option.rs:1645:26

  23:     0x557af2db8f7d - std::panicking::begin_panic_handler::PanicPayload::fill::h7d11c7f51903b619

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:542:13

  24:     0x557af2db8f7d - <std::panicking::begin_panic_handler::PanicPayload as core::panic::BoxMeUp>::get::h0aeaee10d21161fa

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:560:13

  25:     0x557af2db91ec - std::panicking::rust_panic_with_hook::h07a345046772cd1e

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:690:30

  26:     0x557af2db90f7 - std::panicking::begin_panic_handler::{{closure}}::h84a5e74b0ac7bfd9

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:582:13

  27:     0x557af2db7fe6 - std::sys_common::backtrace::__rust_end_short_backtrace::hfab653505a2c6309

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/sys_common/backtrace.rs:151:18

  28:     0x557af2db8e42 - rust_begin_unwind

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:578:5

  29:     0x557af2d9ee73 - core::panicking::panic_fmt::hbffcbe9cdfcee218

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/panicking.rs:67:14

  30:     0x557af2d9f65c - bisektor::main::h96cc4eb0ec795dbe

                               at /home/user/sandbox/bisektor/src/main.rs:14:5

  31:     0x557af2d9f6ab - core::ops::function::FnOnce::call_once::h5ce355268be9f8ba

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/ops/function.rs:250:5

  32:     0x557af2d9f84e - std::sys_common::backtrace::__rust_begin_short_backtrace::h15c79873d1ee3faa

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/sys_common/backtrace.rs:135:18

  33:     0x557af2d9f8c1 - std::rt::lang_start::{{closure}}::h2a436a2d562cd351

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/rt.rs:166:18

  34:     0x557af2db3d65 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h493fb855285e1007

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/core/src/ops/function.rs:284:13

  35:     0x557af2db3d65 - std::panicking::try::do_call::haff6dd8a0a73ce4e

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:485:40

  36:     0x557af2db3d65 - std::panicking::try::h5bcea75ba1fb2aba

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:449:19

  37:     0x557af2db3d65 - std::panic::catch_unwind::hee05f80070b64c93

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panic.rs:142:14

  38:     0x557af2db3d65 - std::rt::lang_start_internal::{{closure}}::hb12ec9dcfd5af90d

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/rt.rs:148:48

  39:     0x557af2db3d65 - std::panicking::try::do_call::hbb03d5d9a87bbfdf

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:485:40

  40:     0x557af2db3d65 - std::panicking::try::he9fcb2f9a6d908d2

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panicking.rs:449:19

  41:     0x557af2db3d65 - std::panic::catch_unwind::hf14a1ebe37b1bec0

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/panic.rs:142:14

  42:     0x557af2db3d65 - std::rt::lang_start_internal::h912e0fcb01a570e5

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/rt.rs:148:20

  43:     0x557af2d9f89a - std::rt::lang_start::h6a55ccf83cc20f0a

                               at /rustc/a2b1646c597329d0a25efa3889b66650f65de1de/library/std/src/rt.rs:165:17

  44:     0x557af2d9f67e - main

  45:     0x7f10f123f0ce - __libc_start_call_main

  46:     0x7f10f123f189 - __libc_start_main@GLIBC_2.2.5

  47:     0x557af2d9f4d5 - _start

  48:                0x0 - <unknown>

thread panicked while panicking. aborting.

Aborted (core dumped)

compiled with

$ rustc -vV
rustc 1.71.0-nightly (a2b1646c5 2023-05-25)
binary: rustc
commit-hash: a2b1646c597329d0a25efa3889b66650f65de1de
commit-date: 2023-05-25
host: x86_64-unknown-linux-gnu
release: 1.71.0-nightly
LLVM version: 16.0.4

code is: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2024&gist=6da22e512530586333b4cae6b0f357d9