Repository: rust
Issue: OpaqueTypeKey ICE with ouroboros
Labels: I-ICE,T-compiler,A-incr-comp,C-bug,S-needs-repro

I upfront apologize for not being able to create a minimum reproducible sample. I tried incrementally to recreate this behavior by creating code from scratch, but wasn't able to. This seems to be triggered by an interaction with `ouroboros`, but when an inner struct changes (but not always, just under some specific set of circumstances I can't pin down). Please let me know if more information is needed to understand what's happening.


### Code

While trying to understand the issue, I created this struct based on an example in the `ouroboros` docs (which worked), and slowly modified to approach what I had that caused the crash. I built it in a separate `mod` and everything worked (I could freely modify the struct without issues, while still using it in an `ouroboros` struct). I then moved it into the same `mod` as my failing struct and switched it out for the struct causing errors in `Context`. Now, if I try to modify the struct (add a field, change a name, anything), the ICE happens. However, as is, it will compile. This happened in 1.72 nightly, so I tried upgrading to nightly today, but no go. If I make changes, `cargo clean` and `cargo build`, it'll work.


```Rust
<code>
pub mod rec {
      pub struct ComplexData<'a> {
	      pub r#type: std::collections::BTreeMap<def::QualifiedName, u64>,
	      pub l2: Vec<crate::rec::Type<'a>>,
      }
}

#[self_referencing]
pub struct Context<'a> {
	def: &'a def::namespace::Namespace<def::DefaultTypeDecl>,
	#[borrows(def)]
	#[covariant]
	complex_data: crate::rec::ComplexData<'this>,
}


```


### Meta
<!--
If you're using the stable version of the compiler, you should also check if the
bug also exists in the beta or nightly versions.
-->

`rustc --version --verbose`:
```
<version>
rustc 1.73.0-nightly (03a119b0b 2023-08-07)
binary: rustc
commit-hash: 03a119b0b0e310d22d94399b24ed030056050f13
commit-date: 2023-08-07
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 16.0.5

```

### Error output

```
<output>
thread 'rustc' panicked at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/compiler/rustc_query_system/src/dep_graph/graph.rs:350:9:
forcing query with already existing `DepNode`
- query-key: Canonical { value: ParamEnvAnd { param_env: ParamEnv { caller_bounds: [Binder { value: TraitPredicate(<ComplexDataBuilder_ as std::marker::Sized>, polarity:Positive), bound_vars: [] }, Binder { value: TraitPredicate(<ComplexDataBuilder_ as std::ops::FnOnce<(&'this &fabric_aem_def_typ::namespace::Namespace<fabric_aem_def_typ::StdNamed<fabric_aem_def_typ::comp::Std<fabric_aem_def_typ::StdTypeUse<fabric_aem_def_typ::prim::Std>>, fabric_aem_def_typ::comp::StdGeneric<fabric_aem_def_typ::StdTypeUse<fabric_aem_def_typ::prim::Std>>>>,)>>, polarity:Positive), bound_vars: [Region(BrNamed(DefId(0:1247 ~ fabric_aem_mach_typ[1b43]::ouroboros_impl_context::{impl#2}::'this), 'this))] }, Binder { value: ProjectionPredicate(AliasTy { args: [ComplexDataBuilder_, (&'this &fabric_aem_def_typ::namespace::Namespace<fabric_aem_def_typ::StdNamed<fabric_aem_def_typ::comp::Std<fabric_aem_def_typ::StdTypeUse<fabric_aem_def_typ::prim::Std>>, fabric_aem_def_typ::comp::StdGeneric<fabric_aem_def_typ::StdTypeUse<fabric_aem_def_typ::prim::Std>>>>,)], def_id: DefId(2:2934 ~ core[d58d]::ops::function::FnOnce::Output) }, Term::Ty(std::pin::Pin<std::boxed::Box<(dyn std::future::Future<Output = rec::ComplexData<'this>> + 'this)>>)), bound_vars: [Region(BrNamed(DefId(0:1247 ~ fabric_aem_mach_typ[1b43]::ouroboros_impl_context::{impl#2}::'this), 'this))] }], reveal: UserFacing }, value: Normalize { value: [async fn body@base/fabric/aem/mach/typ/src/lib.rs:23:1: 23:20] } }, max_universe: U0, variables: [CanonicalVarInfo { kind: Region(U0) }, CanonicalVarInfo { kind: Region(U0) }, CanonicalVarInfo { kind: Region(U0) }, CanonicalVarInfo { kind: Region(U0) }] }
```

<!--
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>

```
<backtrace>
stack backtrace:
   0:     0x7fb527d6313c - std::backtrace_rs::backtrace::libunwind::trace::hce3e928953bc2090
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fb527d6313c - std::backtrace_rs::backtrace::trace_unsynchronized::hca355bd13c592b0c
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fb527d6313c - std::sys_common::backtrace::_print_fmt::h44d865e76ccdae95
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fb527d6313c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6649ade1fbcab036
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fb527dc983c - core::fmt::rt::Argument::fmt::h8f066fabb716785c
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/core/src/fmt/rt.rs:138:9
   5:     0x7fb527dc983c - core::fmt::write::hb13ec807b233a5a9
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/core/src/fmt/mod.rs:1094:21
   6:     0x7fb527d557ce - std::io::Write::write_fmt::h9624102bcbe9cdf3
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/io/mod.rs:1714:15
   7:     0x7fb527d62f25 - std::sys_common::backtrace::_print::h826f6e19825e64be
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fb527d62f25 - std::sys_common::backtrace::print::h38ab5892ba126dbd
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fb527d6607a - std::panicking::panic_hook_with_disk_dump::{{closure}}::h5cf034e3220814da
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:278:22
  10:     0x7fb527d65d13 - std::panicking::panic_hook_with_disk_dump::h2f556212aef98ce9
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:312:9
  11:     0x7fb52b0457b9 - <rustc_driver_impl[196a76b828487ebe]::install_ice_hook::{closure#0} as core[d58d26022ce54cf9]::ops::function::FnOnce<(&core[d58d26022ce54cf9]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  12:     0x7fb527d66920 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd78399023e773aea
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/alloc/src/boxed.rs:2021:9
  13:     0x7fb527d66920 - std::panicking::rust_panic_with_hook::h92a78257c6e77dd8
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:733:13
  14:     0x7fb527d666a7 - std::panicking::begin_panic_handler::{{closure}}::h361d5cc2d3940ca8
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:621:13
  15:     0x7fb527d63676 - std::sys_common::backtrace::__rust_end_short_backtrace::hb375dad8ac9a26ce
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:170:18
  16:     0x7fb527d663f2 - rust_begin_unwind
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:617:5
  17:     0x7fb527dc5bf3 - core::panicking::panic_fmt::hc420f997cfe736c7
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/core/src/panicking.rs:67:14
  18:     0x7fb52a69654d - rustc_query_system[ff1b11b811969333]::query::plumbing::try_execute_query::<rustc_query_impl[448221c6598f4969]::DynamicConfig<rustc_query_system[ff1b11b811969333]::query::caches::DefaultCache<rustc_middle[4ba7bc41550d4ec4]::infer::canonical::Canonical<rustc_middle[4ba7bc41550d4ec4]::ty::ParamEnvAnd<rustc_middle[4ba7bc41550d4ec4]::traits::query::type_op::Normalize<rustc_middle[4ba7bc41550d4ec4]::ty::Ty>>>, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[448221c6598f4969]::plumbing::QueryCtxt, true>
  19:     0x7fb52a6958ff - rustc_query_impl[448221c6598f4969]::query_impl::type_op_normalize_ty::get_query_incr::__rust_end_short_backtrace
  20:     0x7fb529cf4041 - <rustc_middle[4ba7bc41550d4ec4]::ty::Ty as rustc_trait_selection[8c483b5b4c9db9ab]::traits::query::type_op::normalize::Normalizable>::type_op_method
  21:     0x7fb529cee951 - rustc_borrowck[19ed1c66e4925e77]::type_check::free_region_relations::create
  22:     0x7fb529cb4874 - rustc_borrowck[19ed1c66e4925e77]::type_check::type_check
  23:     0x7fb529cac107 - rustc_borrowck[19ed1c66e4925e77]::nll::compute_regions
  24:     0x7fb529c44014 - rustc_borrowck[19ed1c66e4925e77]::do_mir_borrowck
  25:     0x7fb529c42325 - rustc_borrowck[19ed1c66e4925e77]::mir_borrowck
  26:     0x7fb52904954e - rustc_query_impl[448221c6598f4969]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[448221c6598f4969]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>
  27:     0x7fb52904951e - <rustc_query_impl[448221c6598f4969]::query_impl::mir_borrowck::dynamic_query::{closure#2} as core[d58d26022ce54cf9]::ops::function::FnOnce<(rustc_middle[4ba7bc41550d4ec4]::ty::context::TyCtxt, rustc_span[d89656448013b6d3]::def_id::LocalDefId)>>::call_once
  28:     0x7fb529896064 - rustc_query_system[ff1b11b811969333]::query::plumbing::try_execute_query::<rustc_query_impl[448221c6598f4969]::DynamicConfig<rustc_query_system[ff1b11b811969333]::query::caches::VecCache<rustc_span[d89656448013b6d3]::def_id::LocalDefId, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[448221c6598f4969]::plumbing::QueryCtxt, true>
  29:     0x7fb5299ac61c - rustc_query_impl[448221c6598f4969]::query_impl::mir_borrowck::get_query_incr::__rust_end_short_backtrace
  30:     0x7fb52a2276ff - <rustc_borrowck[19ed1c66e4925e77]::type_check::TypeChecker>::prove_closure_bounds
  31:     0x7fb52a20248f - <rustc_borrowck[19ed1c66e4925e77]::type_check::TypeChecker>::typeck_mir
  32:     0x7fb529cb4d50 - rustc_borrowck[19ed1c66e4925e77]::type_check::type_check
  33:     0x7fb529cac107 - rustc_borrowck[19ed1c66e4925e77]::nll::compute_regions
  34:     0x7fb529c44014 - rustc_borrowck[19ed1c66e4925e77]::do_mir_borrowck
  35:     0x7fb529c42325 - rustc_borrowck[19ed1c66e4925e77]::mir_borrowck
  36:     0x7fb52904954e - rustc_query_impl[448221c6598f4969]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[448221c6598f4969]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>
  37:     0x7fb52904951e - <rustc_query_impl[448221c6598f4969]::query_impl::mir_borrowck::dynamic_query::{closure#2} as core[d58d26022ce54cf9]::ops::function::FnOnce<(rustc_middle[4ba7bc41550d4ec4]::ty::context::TyCtxt, rustc_span[d89656448013b6d3]::def_id::LocalDefId)>>::call_once
  38:     0x7fb529896064 - rustc_query_system[ff1b11b811969333]::query::plumbing::try_execute_query::<rustc_query_impl[448221c6598f4969]::DynamicConfig<rustc_query_system[ff1b11b811969333]::query::caches::VecCache<rustc_span[d89656448013b6d3]::def_id::LocalDefId, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[448221c6598f4969]::plumbing::QueryCtxt, true>
  39:     0x7fb529b7f6d6 - rustc_query_system[ff1b11b811969333]::query::plumbing::force_query::<rustc_query_impl[448221c6598f4969]::DynamicConfig<rustc_query_system[ff1b11b811969333]::query::caches::VecCache<rustc_span[d89656448013b6d3]::def_id::LocalDefId, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[448221c6598f4969]::plumbing::QueryCtxt>
  40:     0x7fb52a7dde63 - rustc_query_impl[448221c6598f4969]::plumbing::force_from_dep_node::<rustc_query_impl[448221c6598f4969]::DynamicConfig<rustc_query_system[ff1b11b811969333]::query::caches::VecCache<rustc_span[d89656448013b6d3]::def_id::LocalDefId, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>>
  41:     0x7fb52b93db1d - <rustc_query_impl[448221c6598f4969]::plumbing::query_callback<rustc_query_impl[448221c6598f4969]::query_impl::mir_borrowck::QueryType>::{closure#0} as core[d58d26022ce54cf9]::ops::function::FnOnce<(rustc_middle[4ba7bc41550d4ec4]::ty::context::TyCtxt, rustc_query_system[ff1b11b811969333]::dep_graph::dep_node::DepNode<rustc_middle[4ba7bc41550d4ec4]::dep_graph::dep_node::DepKind>)>>::call_once
  42:     0x7fb5291885f9 - <rustc_query_system[ff1b11b811969333]::dep_graph::graph::DepGraphData<rustc_middle[4ba7bc41550d4ec4]::dep_graph::dep_node::DepKind>>::try_mark_previous_green::<rustc_query_impl[448221c6598f4969]::plumbing::QueryCtxt>
  43:     0x7fb529b465dd - rustc_query_system[ff1b11b811969333]::query::plumbing::try_execute_query::<rustc_query_impl[448221c6598f4969]::DynamicConfig<rustc_query_system[ff1b11b811969333]::query::caches::DefaultCache<rustc_span[d89656448013b6d3]::def_id::DefId, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[448221c6598f4969]::plumbing::QueryCtxt, true>
  44:     0x7fb52a999d9c - rustc_query_impl[448221c6598f4969]::query_impl::type_of::get_query_incr::__rust_end_short_backtrace
  45:     0x7fb52a1b13f6 - rustc_middle[4ba7bc41550d4ec4]::query::plumbing::query_get_at::<rustc_query_system[ff1b11b811969333]::query::caches::DefaultCache<rustc_span[d89656448013b6d3]::def_id::DefId, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 8usize]>>>
  46:     0x7fb52a1a9cd6 - rustc_hir_analysis[266c6319d34224b7]::check::check::check_mod_item_types
  47:     0x7fb529de7e0c - rustc_query_impl[448221c6598f4969]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[448221c6598f4969]::query_impl::check_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 0usize]>>
  48:     0x7fb529de7dee - <rustc_query_impl[448221c6598f4969]::query_impl::check_mod_item_types::dynamic_query::{closure#2} as core[d58d26022ce54cf9]::ops::function::FnOnce<(rustc_middle[4ba7bc41550d4ec4]::ty::context::TyCtxt, rustc_span[d89656448013b6d3]::def_id::LocalDefId)>>::call_once
  49:     0x7fb529ddb5c0 - rustc_query_system[ff1b11b811969333]::query::plumbing::try_execute_query::<rustc_query_impl[448221c6598f4969]::DynamicConfig<rustc_query_system[ff1b11b811969333]::query::caches::VecCache<rustc_span[d89656448013b6d3]::def_id::LocalDefId, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[448221c6598f4969]::plumbing::QueryCtxt, true>
  50:     0x7fb52a9a4f72 - rustc_query_impl[448221c6598f4969]::query_impl::check_mod_item_types::get_query_incr::__rust_end_short_backtrace
  51:     0x7fb52a4fb0a7 - <rustc_middle[4ba7bc41550d4ec4]::hir::map::Map>::for_each_module::<rustc_hir_analysis[266c6319d34224b7]::check_crate::{closure#6}::{closure#0}>
  52:     0x7fb52a4f9dff - rustc_hir_analysis[266c6319d34224b7]::check_crate
  53:     0x7fb52a4f427a - rustc_interface[99275295a6910fa9]::passes::analysis
  54:     0x7fb52a52b97a - rustc_query_impl[448221c6598f4969]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[448221c6598f4969]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 1usize]>>
  55:     0x7fb52a52b969 - <rustc_query_impl[448221c6598f4969]::query_impl::analysis::dynamic_query::{closure#2} as core[d58d26022ce54cf9]::ops::function::FnOnce<(rustc_middle[4ba7bc41550d4ec4]::ty::context::TyCtxt, ())>>::call_once
  56:     0x7fb52a814b86 - rustc_query_system[ff1b11b811969333]::query::plumbing::try_execute_query::<rustc_query_impl[448221c6598f4969]::DynamicConfig<rustc_query_system[ff1b11b811969333]::query::caches::SingleCache<rustc_middle[4ba7bc41550d4ec4]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[448221c6598f4969]::plumbing::QueryCtxt, true>
  57:     0x7fb52a8146fe - rustc_query_impl[448221c6598f4969]::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
  58:     0x7fb52a2cdb45 - <rustc_middle[4ba7bc41550d4ec4]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[196a76b828487ebe]::run_compiler::{closure#1}::{closure#2}::{closure#5}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>
  59:     0x7fb52a2cc9e3 - rustc_span[d89656448013b6d3]::set_source_map::<core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>, rustc_interface[99275295a6910fa9]::interface::run_compiler<core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>, rustc_driver_impl[196a76b828487ebe]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  60:     0x7fb52a2c6b80 - std[31c3f87331eb5e42]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[99275295a6910fa9]::util::run_in_thread_pool_with_globals<rustc_interface[99275295a6910fa9]::interface::run_compiler<core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>, rustc_driver_impl[196a76b828487ebe]::run_compiler::{closure#1}>::{closure#0}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>
  61:     0x7fb52a2c64de - <<std[31c3f87331eb5e42]::thread::Builder>::spawn_unchecked_<rustc_interface[99275295a6910fa9]::util::run_in_thread_pool_with_globals<rustc_interface[99275295a6910fa9]::interface::run_compiler<core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>, rustc_driver_impl[196a76b828487ebe]::run_compiler::{closure#1}>::{closure#0}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>::{closure#1} as core[d58d26022ce54cf9]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  62:     0x7fb527d710c5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h347acbcb58be099b
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/alloc/src/boxed.rs:2007:9
  63:     0x7fb527d710c5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc150f5dcae5f9c37
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/alloc/src/boxed.rs:2007:9
  64:     0x7fb527d710c5 - std::sys::unix::thread::Thread::new::thread_start::h77f77ee5162cba0c
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys/unix/thread.rs:108:17
  65:     0x7fb527a8f18a - start_thread
                               at ./nptl/pthread_create.c:444:8
  66:     0x7fb527b1dbd0 - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  67:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

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 attach the file at `/home/matt/prj/epitaxial/main/src/rustc-ice-2023-08-08T22:25:19.528627676Z-249165.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [type_op_normalize_ty] normalizing `[async fn body@base/fabric/aem/mach/typ/src/lib.rs:23:1: 23:20]`
#1 [mir_borrowck] borrow-checking `ouroboros_impl_context::<impl at base/fabric/aem/mach/typ/src/lib.rs:23:1: 23:20>::build::{closure#0}`
#2 [mir_borrowck] borrow-checking `ouroboros_impl_context::<impl at base/fabric/aem/mach/typ/src/lib.rs:23:1: 23:20>::build`
#3 [type_of] computing type of `ouroboros_impl_context::<impl at base/fabric/aem/mach/typ/src/lib.rs:23:1: 23:20>::build::{opaque#0}`
#4 [check_mod_item_types] checking item types in module `ouroboros_impl_context`
#5 [analysis] running analysis passes on this crate
end of query stack
there was a panic while trying to force a dep node
try_mark_green dep node stack:
#0 type_of(fabric_aem_mach_typ[1b43]::ouroboros_impl_context::{impl#2}::build::{opaque#0})
end of try_mark_green dep node stack
error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: {OpaqueTypeKey { def_id: DefId(0:1724 ~ fabric_aem_mach_typ[1b43]::ouroboros_impl_context::{impl#2}::build::{opaque#0}), args: ['?8, ComplexDataBuilder_, '?9] }: OpaqueTypeDecl { hidden_type: OpaqueHiddenType { span: base/fabric/aem/mach/typ/src/lib.rs:23:1: 23:20 (#129), ty: [async fn body@base/fabric/aem/mach/typ/src/lib.rs:23:1: 23:20] } }}
  |
  = note: delayed at compiler/rustc_infer/src/infer/opaque_types/table.rs:44:26
             0: <rustc_errors::HandlerInner>::emit_diagnostic
             1: <rustc_session::session::Session>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
             2: core::ptr::drop_in_place::<rustc_infer::infer::InferCtxt>
             3: rustc_borrowck::mir_borrowck
             4: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
             5: <rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
             6: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, true>
             7: rustc_query_system::query::plumbing::force_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>
             8: rustc_query_impl::plumbing::force_from_dep_node::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>>
             9: <rustc_query_impl::plumbing::query_callback<rustc_query_impl::query_impl::mir_borrowck::QueryType>::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_query_system::dep_graph::dep_node::DepNode<rustc_middle::dep_graph::dep_node::DepKind>)>>::call_once
            10: <rustc_query_system::dep_graph::graph::DepGraphData<rustc_middle::dep_graph::dep_node::DepKind>>::try_mark_previous_green::<rustc_query_impl::plumbing::QueryCtxt>
            11: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, true>
            12: rustc_query_impl::query_impl::type_of::get_query_incr::__rust_end_short_backtrace
            13: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 8]>>>
            14: rustc_hir_analysis::check::check::check_mod_item_types
            15: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>
            16: <rustc_query_impl::query_impl::check_mod_item_types::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
            17: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, true>
            18: rustc_query_impl::query_impl::check_mod_item_types::get_query_incr::__rust_end_short_backtrace
            19: <rustc_middle::hir::map::Map>::for_each_module::<rustc_hir_analysis::check_crate::{closure#6}::{closure#0}>
            20: rustc_hir_analysis::check_crate
            21: rustc_interface::passes::analysis
            22: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
            23: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
            24: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, true>
            25: rustc_query_impl::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
            26: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#5}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            27: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
            28: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            29: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            30: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/alloc/src/boxed.rs:2007:9
            31: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/alloc/src/boxed.rs:2007:9
            32: std::sys::unix::thread::Thread::new::thread_start
                       at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys/unix/thread.rs:108:17
            33: start_thread
                       at ./nptl/pthread_create.c:444:8
            34: __GI___clone3
                       at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
          

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 attach the file at `/home/matt/prj/epitaxial/main/src/rustc-ice-2023-08-08T22:25:19.528627676Z-249165.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
thread 'rustc' panicked at library/core/src/panicking.rs:126:5:
panic in a function that cannot unwind
stack backtrace:
   0:     0x7fb527d6313c - std::backtrace_rs::backtrace::libunwind::trace::hce3e928953bc2090
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fb527d6313c - std::backtrace_rs::backtrace::trace_unsynchronized::hca355bd13c592b0c
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fb527d6313c - std::sys_common::backtrace::_print_fmt::h44d865e76ccdae95
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fb527d6313c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6649ade1fbcab036
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fb527dc983c - core::fmt::rt::Argument::fmt::h8f066fabb716785c
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/core/src/fmt/rt.rs:138:9
   5:     0x7fb527dc983c - core::fmt::write::hb13ec807b233a5a9
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/core/src/fmt/mod.rs:1094:21
   6:     0x7fb527d557ce - std::io::Write::write_fmt::h9624102bcbe9cdf3
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/io/mod.rs:1714:15
   7:     0x7fb527d62f25 - std::sys_common::backtrace::_print::h826f6e19825e64be
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fb527d62f25 - std::sys_common::backtrace::print::h38ab5892ba126dbd
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fb527d6607a - std::panicking::panic_hook_with_disk_dump::{{closure}}::h5cf034e3220814da
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:278:22
  10:     0x7fb527d65d13 - std::panicking::panic_hook_with_disk_dump::h2f556212aef98ce9
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:312:9
  11:     0x7fb52b0457b9 - <rustc_driver_impl[196a76b828487ebe]::install_ice_hook::{closure#0} as core[d58d26022ce54cf9]::ops::function::FnOnce<(&core[d58d26022ce54cf9]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  12:     0x7fb527d66920 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd78399023e773aea
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/alloc/src/boxed.rs:2021:9
  13:     0x7fb527d66920 - std::panicking::rust_panic_with_hook::h92a78257c6e77dd8
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:733:13
  14:     0x7fb527d66661 - std::panicking::begin_panic_handler::{{closure}}::h361d5cc2d3940ca8
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:619:13
  15:     0x7fb527d63676 - std::sys_common::backtrace::__rust_end_short_backtrace::hb375dad8ac9a26ce
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys_common/backtrace.rs:170:18
  16:     0x7fb527d663f2 - rust_begin_unwind
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/panicking.rs:617:5
  17:     0x7fb527dc5c33 - core::panicking::panic_nounwind_fmt::hb40c402e860cb7b7
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/core/src/panicking.rs:96:14
  18:     0x7fb527dc5cd7 - core::panicking::panic_nounwind::h0ba2cc5d9f3e183b
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/core/src/panicking.rs:126:5
  19:     0x7fb527dc5e63 - core::panicking::panic_cannot_unwind::hd404264b8e994729
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/core/src/panicking.rs:189:5
  20:     0x7fb52a2cd837 - rustc_span[d89656448013b6d3]::set_source_map::<core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>, rustc_interface[99275295a6910fa9]::interface::run_compiler<core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>, rustc_driver_impl[196a76b828487ebe]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  21:     0x7fb52a2c6b80 - std[31c3f87331eb5e42]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[99275295a6910fa9]::util::run_in_thread_pool_with_globals<rustc_interface[99275295a6910fa9]::interface::run_compiler<core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>, rustc_driver_impl[196a76b828487ebe]::run_compiler::{closure#1}>::{closure#0}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>
  22:     0x7fb52a2c64de - <<std[31c3f87331eb5e42]::thread::Builder>::spawn_unchecked_<rustc_interface[99275295a6910fa9]::util::run_in_thread_pool_with_globals<rustc_interface[99275295a6910fa9]::interface::run_compiler<core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>, rustc_driver_impl[196a76b828487ebe]::run_compiler::{closure#1}>::{closure#0}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d58d26022ce54cf9]::result::Result<(), rustc_span[d89656448013b6d3]::ErrorGuaranteed>>::{closure#1} as core[d58d26022ce54cf9]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  23:     0x7fb527d710c5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h347acbcb58be099b
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/alloc/src/boxed.rs:2007:9
  24:     0x7fb527d710c5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc150f5dcae5f9c37
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/alloc/src/boxed.rs:2007:9
  25:     0x7fb527d710c5 - std::sys::unix::thread::Thread::new::thread_start::h77f77ee5162cba0c
                               at /rustc/03a119b0b0e310d22d94399b24ed030056050f13/library/std/src/sys/unix/thread.rs:108:17
  26:     0x7fb527a8f18a - start_thread
                               at ./nptl/pthread_create.c:444:8
  27:     0x7fb527b1dbd0 - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  28:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

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 attach the file at `/home/matt/prj/epitaxial/main/src/rustc-ice-2023-08-08T22:25:19.528627676Z-249165.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
thread caused non-unwinding panic. aborting.

```

</p>
</details>
[rustc-ice-2023-08-08T22:25:19.528627676Z-249165.txt](https://github.com/rust-lang/rust/files/12296626/rustc-ice-2023-08-08T22.25.19.528627676Z-249165.txt)