Repository: rust
Issue: ICE files are missing the span and message from `bug!`/`span_bug!`
Labels: T-compiler,C-bug,D-diagnostic-infra,A-metrics

I have seen it a couple of times already that people attach ICE files but these backtrace or files look like they are missing the actual ICE message from the report.

for example, my ICE may look like this (or, this is what I would consider part of it)

<!--
Include a backtrace in the code block by setting `RUST_BACKTRACE=1` in your
environment. E.g. `RUST_BACKTRACE=1 cargo build`.
-->
<details><summary><strong>Backtrace</strong></summary>
<p>

```
error: internal compiler error: compiler/rustc_trait_selection/src/traits/normalize.rs:69:17: deeply_normalize should not be called with pending obligations: [
                                    Obligation(predicate=Binder { value: TraitPredicate(<_ as TraitA>, polarity:Positive), bound_vars: [] }, depth=1),
                                ]
  --> a.rs:52:24
   |
52 |     fn method(self) -> impl for<'a> FnMut(&'a ()) -> Self::Assoc<'a>;
   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at compiler/rustc_trait_selection/src/traits/normalize.rs:69:17:
Box<dyn Any>
stack backtrace:
   0:     0x75750014124a - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hbaae7ee6452314ac
   1:     0x757500813c26 - core::fmt::write::h2f9a8d2f2637a85f
   2:     0x757501be0551 - std::io::Write::write_fmt::he34daf083f9a3021
   3:     0x7575001410a2 - std::sys::backtrace::BacktraceLock::print::h0058685886628669
   4:     0x7575001435aa - std::panicking::default_hook::{{closure}}::h57409c565dc0e9b1
   5:     0x7575001433f3 - std::panicking::default_hook::ha667d029378d179a
   6:     0x7574ff2bfa48 - std[c2c54d6827da810b]::panicking::update_hook::<alloc[34a40601127b84fc]::boxed::Box<rustc_driver_impl[c0d80c2a9490dd80]::install_ice_hook::{closure#0}>>::{closure#0}
   7:     0x757500143d68 - std::panicking::rust_panic_with_hook::h12054419da422896
   8:     0x7574ff2f5271 - std[c2c54d6827da810b]::panicking::begin_panic::<rustc_errors[2e40efcb590bb17b]::ExplicitBug>::{closure#0}
   9:     0x7574ff2ea136 - std[c2c54d6827da810b]::sys::backtrace::__rust_end_short_backtrace::<std[c2c54d6827da810b]::panicking::begin_panic<rustc_errors[2e40efcb590bb17b]::ExplicitBug>::{closure#0}, !>
  10:     0x7574ff2ea123 - std[c2c54d6827da810b]::panicking::begin_panic::<rustc_errors[2e40efcb590bb17b]::ExplicitBug>
  11:     0x7574ff2ff2b1 - <rustc_errors[2e40efcb590bb17b]::diagnostic::BugAbort as rustc_errors[2e40efcb590bb17b]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7574ff854a9c - <rustc_errors[2e40efcb590bb17b]::DiagCtxtHandle>::span_bug::<rustc_span[2659c11acd16cd7]::span_encoding::Span, alloc[34a40601127b84fc]::string::String>
  13:     0x7574ff8e75d7 - rustc_middle[27a877ea52447dab]::util::bug::opt_span_bug_fmt::<rustc_span[2659c11acd16cd7]::span_encoding::Span>::{closure#0}
  14:     0x7574ff8cfa6a - rustc_middle[27a877ea52447dab]::ty::context::tls::with_opt::<rustc_middle[27a877ea52447dab]::util::bug::opt_span_bug_fmt<rustc_span[2659c11acd16cd7]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  15:     0x7574ff8cf8fb - rustc_middle[27a877ea52447dab]::ty::context::tls::with_context_opt::<rustc_middle[27a877ea52447dab]::ty::context::tls::with_opt<rustc_middle[27a877ea52447dab]::util::bug::opt_span_bug_fmt<rustc_span[2659c11acd16cd7]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  16:     0x7574fe3d2d77 - rustc_middle[27a877ea52447dab]::util::bug::span_bug_fmt::<rustc_span[2659c11acd16cd7]::span_encoding::Span>
  17:     0x757500bc00d4 - <rustc_trait_selection[bf65a12e96ea037e]::traits::engine::ObligationCtxt<rustc_trait_selection[bf65a12e96ea037e]::traits::FulfillmentError>>::assumed_wf_types_and_report_errors
  18:     0x75750105c126 - rustc_hir_analysis[6d68d5be0ecf7979]::check::compare_impl_item::check_type_bounds
  19:     0x757500e5921d - rustc_hir_analysis[6d68d5be0ecf7979]::check::compare_impl_item::compare_impl_item
  20:     0x757500e56b51 - rustc_query_impl[a2008a1cc616166f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a2008a1cc616166f]::query_impl::compare_impl_item::dynamic_query::{closure#2}::{closure#0}, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>
  21:     0x75750121e930 - rustc_query_system[9a3c01f0ed066ff8]::query::plumbing::try_execute_query::<rustc_query_impl[a2008a1cc616166f]::DynamicConfig<rustc_data_structures[848008ad1566c8b0]::vec_cache::VecCache<rustc_span[2659c11acd16cd7]::def_id::LocalDefId, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[9a3c01f0ed066ff8]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a2008a1cc616166f]::plumbing::QueryCtxt, false>
  22:     0x75750121e401 - rustc_query_impl[a2008a1cc616166f]::query_impl::compare_impl_item::get_query_non_incr::__rust_end_short_backtrace
  23:     0x7574fcdb057d - rustc_hir_analysis[6d68d5be0ecf7979]::check::check::check_item_type
  24:     0x7574fe4419e5 - rustc_hir_analysis[6d68d5be0ecf7979]::check::wfcheck::check_well_formed
  25:     0x75750121e687 - rustc_query_impl[a2008a1cc616166f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a2008a1cc616166f]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>
  26:     0x75750121e948 - rustc_query_system[9a3c01f0ed066ff8]::query::plumbing::try_execute_query::<rustc_query_impl[a2008a1cc616166f]::DynamicConfig<rustc_data_structures[848008ad1566c8b0]::vec_cache::VecCache<rustc_span[2659c11acd16cd7]::def_id::LocalDefId, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[9a3c01f0ed066ff8]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a2008a1cc616166f]::plumbing::QueryCtxt, false>
  27:     0x75750121e662 - rustc_query_impl[a2008a1cc616166f]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  28:     0x75750121f3ec - rustc_hir_analysis[6d68d5be0ecf7979]::check::wfcheck::check_mod_type_wf
  29:     0x75750121f20b - rustc_query_impl[a2008a1cc616166f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a2008a1cc616166f]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>
  30:     0x75750181a208 - rustc_query_system[9a3c01f0ed066ff8]::query::plumbing::try_execute_query::<rustc_query_impl[a2008a1cc616166f]::DynamicConfig<rustc_query_system[9a3c01f0ed066ff8]::query::caches::DefaultCache<rustc_span[2659c11acd16cd7]::def_id::LocalModDefId, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[a2008a1cc616166f]::plumbing::QueryCtxt, false>
  31:     0x757501819fb0 - rustc_query_impl[a2008a1cc616166f]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  32:     0x757500a9eb9c - rustc_hir_analysis[6d68d5be0ecf7979]::check_crate
  33:     0x757501128cbc - rustc_interface[4b3ef207fa86e12e]::passes::run_required_analyses
  34:     0x757501123d1e - rustc_interface[4b3ef207fa86e12e]::passes::analysis
  35:     0x757501123cef - rustc_query_impl[a2008a1cc616166f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a2008a1cc616166f]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>
  36:     0x7575017d5dba - rustc_query_system[9a3c01f0ed066ff8]::query::plumbing::try_execute_query::<rustc_query_impl[a2008a1cc616166f]::DynamicConfig<rustc_query_system[9a3c01f0ed066ff8]::query::caches::SingleCache<rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[a2008a1cc616166f]::plumbing::QueryCtxt, false>
  37:     0x7575017d5a8e - rustc_query_impl[a2008a1cc616166f]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  38:     0x757501864e39 - rustc_interface[4b3ef207fa86e12e]::interface::run_compiler::<core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>, rustc_driver_impl[c0d80c2a9490dd80]::run_compiler::{closure#0}>::{closure#1}
  39:     0x7575017c08a1 - std[c2c54d6827da810b]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[4b3ef207fa86e12e]::util::run_in_thread_with_globals<rustc_interface[4b3ef207fa86e12e]::util::run_in_thread_pool_with_globals<rustc_interface[4b3ef207fa86e12e]::interface::run_compiler<core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>, rustc_driver_impl[c0d80c2a9490dd80]::run_compiler::{closure#0}>::{closure#1}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#0}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>
  40:     0x7575017c0548 - <<std[c2c54d6827da810b]::thread::Builder>::spawn_unchecked_<rustc_interface[4b3ef207fa86e12e]::util::run_in_thread_with_globals<rustc_interface[4b3ef207fa86e12e]::util::run_in_thread_pool_with_globals<rustc_interface[4b3ef207fa86e12e]::interface::run_compiler<core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>, rustc_driver_impl[c0d80c2a9490dd80]::run_compiler::{closure#0}>::{closure#1}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#0}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#1} as core[437bb64b3ca51b65]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  41:     0x7575017bfc7b - std::sys::pal::unix::thread::Thread::new::thread_start::h2b35487752b07311
  42:     0x7574fbaa339d - <unknown>
  43:     0x7574fbb2849c - <unknown>
  44:                0x0 - <unknown>

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: please attach the file at `/tmp/im/1/rustc-ice-2024-12-04T19_53_55-344983.txt` to your bug report

query stack during panic:
#0 [compare_impl_item] checking assoc item `<impl at a.rs:55:1: 57:43>::{synthetic#0}` is compatible with trait definition
#1 [check_well_formed] checking that `<impl at a.rs:55:1: 57:43>` is well-formed
end of query stack
error[E0433]: failed to resolve: use of undeclared type `WrapperT`
  --> a.rs:46:12
   |
46 |     helper(WrapperT::AssocB as TraitA);
   |            ^^^^^^^^
   |            |
   |            use of undeclared type `WrapperT`
   |            help: a struct with a similar name exists: `Wrapper`

error: aborting due to 13 previous errors

Some errors have detailed explanations: E0261, E0277, E0412, E0433, E0437, E0576, E0658.
For more information about an error, try `rustc --explain E0261`.
```

</p>
</details>

however, the ice-dump file does not contain the actual ICE message
```
error: internal compiler error: compiler/rustc_trait_selection/src/traits/normalize.rs:69:17: deeply_normalize should not be called with pending obligations: [
                                    Obligation(predicate=Binder { value: TraitPredicate(<_ as TraitA>, polarity:Positive), bound_vars: [] }, depth=1),
                                ]
```
 which makes it harder to compare it to other ICEs, check if it has been reported already or search for in the tracker...

what ends up in the file is only this:



<!--
Include a backtrace in the code block by setting `RUST_BACKTRACE=1` in your
environment. E.g. `RUST_BACKTRACE=1 cargo build`.
-->
<details><summary><strong>Backtrace</strong></summary>
<p>

```
thread 'rustc' panicked at compiler/rustc_trait_selection/src/traits/normalize.rs:69:17:
Box<dyn Any>
stack backtrace:
   0:     0x757501be59a5 - std::backtrace::Backtrace::create::h78d0e7511919e78f
   1:     0x75750012c445 - std::backtrace::Backtrace::force_capture::h954b965bf7c9452b
   2:     0x7574ff2c0046 - std[c2c54d6827da810b]::panicking::update_hook::<alloc[34a40601127b84fc]::boxed::Box<rustc_driver_impl[c0d80c2a9490dd80]::install_ice_hook::{closure#0}>>::{closure#0}
   3:     0x757500143d68 - std::panicking::rust_panic_with_hook::h12054419da422896
   4:     0x7574ff2f5271 - std[c2c54d6827da810b]::panicking::begin_panic::<rustc_errors[2e40efcb590bb17b]::ExplicitBug>::{closure#0}
   5:     0x7574ff2ea136 - std[c2c54d6827da810b]::sys::backtrace::__rust_end_short_backtrace::<std[c2c54d6827da810b]::panicking::begin_panic<rustc_errors[2e40efcb590bb17b]::ExplicitBug>::{closure#0}, !>
   6:     0x7574ff2ea123 - std[c2c54d6827da810b]::panicking::begin_panic::<rustc_errors[2e40efcb590bb17b]::ExplicitBug>
   7:     0x7574ff2ff2b1 - <rustc_errors[2e40efcb590bb17b]::diagnostic::BugAbort as rustc_errors[2e40efcb590bb17b]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
   8:     0x7574ff854a9c - <rustc_errors[2e40efcb590bb17b]::DiagCtxtHandle>::span_bug::<rustc_span[2659c11acd16cd7]::span_encoding::Span, alloc[34a40601127b84fc]::string::String>
   9:     0x7574ff8e75d7 - rustc_middle[27a877ea52447dab]::util::bug::opt_span_bug_fmt::<rustc_span[2659c11acd16cd7]::span_encoding::Span>::{closure#0}
  10:     0x7574ff8cfa6a - rustc_middle[27a877ea52447dab]::ty::context::tls::with_opt::<rustc_middle[27a877ea52447dab]::util::bug::opt_span_bug_fmt<rustc_span[2659c11acd16cd7]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  11:     0x7574ff8cf8fb - rustc_middle[27a877ea52447dab]::ty::context::tls::with_context_opt::<rustc_middle[27a877ea52447dab]::ty::context::tls::with_opt<rustc_middle[27a877ea52447dab]::util::bug::opt_span_bug_fmt<rustc_span[2659c11acd16cd7]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  12:     0x7574fe3d2d77 - rustc_middle[27a877ea52447dab]::util::bug::span_bug_fmt::<rustc_span[2659c11acd16cd7]::span_encoding::Span>
  13:     0x757500bc00d4 - <rustc_trait_selection[bf65a12e96ea037e]::traits::engine::ObligationCtxt<rustc_trait_selection[bf65a12e96ea037e]::traits::FulfillmentError>>::assumed_wf_types_and_report_errors
  14:     0x75750105c126 - rustc_hir_analysis[6d68d5be0ecf7979]::check::compare_impl_item::check_type_bounds
  15:     0x757500e5921d - rustc_hir_analysis[6d68d5be0ecf7979]::check::compare_impl_item::compare_impl_item
  16:     0x757500e56b51 - rustc_query_impl[a2008a1cc616166f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a2008a1cc616166f]::query_impl::compare_impl_item::dynamic_query::{closure#2}::{closure#0}, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>
  17:     0x75750121e930 - rustc_query_system[9a3c01f0ed066ff8]::query::plumbing::try_execute_query::<rustc_query_impl[a2008a1cc616166f]::DynamicConfig<rustc_data_structures[848008ad1566c8b0]::vec_cache::VecCache<rustc_span[2659c11acd16cd7]::def_id::LocalDefId, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[9a3c01f0ed066ff8]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a2008a1cc616166f]::plumbing::QueryCtxt, false>
  18:     0x75750121e401 - rustc_query_impl[a2008a1cc616166f]::query_impl::compare_impl_item::get_query_non_incr::__rust_end_short_backtrace
  19:     0x7574fcdb057d - rustc_hir_analysis[6d68d5be0ecf7979]::check::check::check_item_type
  20:     0x7574fe4419e5 - rustc_hir_analysis[6d68d5be0ecf7979]::check::wfcheck::check_well_formed
  21:     0x75750121e687 - rustc_query_impl[a2008a1cc616166f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a2008a1cc616166f]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>
  22:     0x75750121e948 - rustc_query_system[9a3c01f0ed066ff8]::query::plumbing::try_execute_query::<rustc_query_impl[a2008a1cc616166f]::DynamicConfig<rustc_data_structures[848008ad1566c8b0]::vec_cache::VecCache<rustc_span[2659c11acd16cd7]::def_id::LocalDefId, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[9a3c01f0ed066ff8]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a2008a1cc616166f]::plumbing::QueryCtxt, false>
  23:     0x75750121e662 - rustc_query_impl[a2008a1cc616166f]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  24:     0x75750121f3ec - rustc_hir_analysis[6d68d5be0ecf7979]::check::wfcheck::check_mod_type_wf
  25:     0x75750121f20b - rustc_query_impl[a2008a1cc616166f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a2008a1cc616166f]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>
  26:     0x75750181a208 - rustc_query_system[9a3c01f0ed066ff8]::query::plumbing::try_execute_query::<rustc_query_impl[a2008a1cc616166f]::DynamicConfig<rustc_query_system[9a3c01f0ed066ff8]::query::caches::DefaultCache<rustc_span[2659c11acd16cd7]::def_id::LocalModDefId, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[a2008a1cc616166f]::plumbing::QueryCtxt, false>
  27:     0x757501819fb0 - rustc_query_impl[a2008a1cc616166f]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  28:     0x757500a9eb9c - rustc_hir_analysis[6d68d5be0ecf7979]::check_crate
  29:     0x757501128cbc - rustc_interface[4b3ef207fa86e12e]::passes::run_required_analyses
  30:     0x757501123d1e - rustc_interface[4b3ef207fa86e12e]::passes::analysis
  31:     0x757501123cef - rustc_query_impl[a2008a1cc616166f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a2008a1cc616166f]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>
  32:     0x7575017d5dba - rustc_query_system[9a3c01f0ed066ff8]::query::plumbing::try_execute_query::<rustc_query_impl[a2008a1cc616166f]::DynamicConfig<rustc_query_system[9a3c01f0ed066ff8]::query::caches::SingleCache<rustc_middle[27a877ea52447dab]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[a2008a1cc616166f]::plumbing::QueryCtxt, false>
  33:     0x7575017d5a8e - rustc_query_impl[a2008a1cc616166f]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  34:     0x757501864e39 - rustc_interface[4b3ef207fa86e12e]::interface::run_compiler::<core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>, rustc_driver_impl[c0d80c2a9490dd80]::run_compiler::{closure#0}>::{closure#1}
  35:     0x7575017c08a1 - std[c2c54d6827da810b]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[4b3ef207fa86e12e]::util::run_in_thread_with_globals<rustc_interface[4b3ef207fa86e12e]::util::run_in_thread_pool_with_globals<rustc_interface[4b3ef207fa86e12e]::interface::run_compiler<core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>, rustc_driver_impl[c0d80c2a9490dd80]::run_compiler::{closure#0}>::{closure#1}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#0}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>
  36:     0x7575017c0548 - <<std[c2c54d6827da810b]::thread::Builder>::spawn_unchecked_<rustc_interface[4b3ef207fa86e12e]::util::run_in_thread_with_globals<rustc_interface[4b3ef207fa86e12e]::util::run_in_thread_pool_with_globals<rustc_interface[4b3ef207fa86e12e]::interface::run_compiler<core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>, rustc_driver_impl[c0d80c2a9490dd80]::run_compiler::{closure#0}>::{closure#1}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#0}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[437bb64b3ca51b65]::result::Result<(), rustc_span[2659c11acd16cd7]::ErrorGuaranteed>>::{closure#1} as core[437bb64b3ca51b65]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x7575017bfc7b - std::sys::pal::unix::thread::Thread::new::thread_start::h2b35487752b07311
  38:     0x7574fbaa339d - <unknown>
  39:     0x7574fbb2849c - <unknown>
  40:                0x0 - <unknown>


rustc version: 1.85.0-nightly (c44b3d50f 2024-12-03)
platform: x86_64-unknown-linux-gnu

query stack during panic:
#0 [compare_impl_item] checking assoc item `<impl at a.rs:55:1: 57:43>::{synthetic#0}` is compatible with trait definition
#1 [check_well_formed] checking that `<impl at a.rs:55:1: 57:43>` is well-formed
#2 [check_mod_type_wf] checking that types are well-formed in top-level module
#3 [analysis] running analysis passes on this crate
end of query stack
```

</p>
</details>

can we extend what is printed into the file, or are there privacy concerns etc?