[ICE]: did not expect successful goal when collecting ambiguity errors for

snippet:

//@compile-flags: --edition=2024
trait MyTrait {}
struct D;
impl<'de> DeserTrait<'de> for &'de DeserStruct {}

trait DeserTrait<'DeserStruct> {}
struct DeserStruct;
impl<'de> DeserTrait<'de> for &'static MyTrait {}

fn test() -> impl Send {
    let deserializer = DeserStruct;
    let graph = testfn(&deserializer);
    graph
}

pub fn testfn<'de, D: DeserTrait<'de>>(_deserializer: D) -> impl MyTrait + 'static {
    MyStruct
}

Version information

rustc 1.100.0-nightly (347a1dbf4 2026-08-24)
binary: rustc
commit-hash: 347a1dbf428ab92f284e3afafacfa7eb46341a5d
commit-date: 2026-08-24
host: x86_64-unknown-linux-gnu
release: 1.100.0-nightly
LLVM version: 23.1.0

Possibly related line of code:

rust/compiler/rustc_trait_selection/src/solve/fulfill/derive_errors.rs

Lines 118 to 130 in 347a1db

    
               // inference guidance that makes other goals go from ambig -> pass, for example. 
        
               // 
        
               // FIXME: We should probably just look into overflows here. 
        
               false, 
        
           ), 
        
           Ok(GoalEvaluation { certainty: Certainty::Yes, .. }) => { 
        
               span_bug!( 
        
                   root_obligation.cause.span, 
        
                   "did not expect successful goal when collecting ambiguity errors for `{:?}`", 
        
                   infcx.resolve_vars_if_possible(root_obligation.predicate), 
        
               ) 
        
           } 
        
           Err(_) => {

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2024

Program output

error[E0425]: cannot find value `MyStruct` in this scope
  --> /tmp/icemaker_global_tempdir.gylpnR9gPvzU/rustc_testrunner_tmpdir_reporting.3NNlYTxae64C/mvce.rs:16:5
   |
16 |     MyStruct
   |     ^^^^^^^^ not found in this scope

error[E0601]: `main` function not found in crate `mvce`
  --> /tmp/icemaker_global_tempdir.gylpnR9gPvzU/rustc_testrunner_tmpdir_reporting.3NNlYTxae64C/mvce.rs:17:2
   |
17 | }
   |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.gylpnR9gPvzU/rustc_testrunner_tmpdir_reporting.3NNlYTxae64C/mvce.rs`

error[E0782]: expected a type, found a trait
 --> /tmp/icemaker_global_tempdir.gylpnR9gPvzU/rustc_testrunner_tmpdir_reporting.3NNlYTxae64C/mvce.rs:7:40
  |
7 | impl<'de> DeserTrait<'de> for &'static MyTrait {}
  |                                        ^^^^^^^
  |
help: you can add the `dyn` keyword if you want a trait object
  |
7 | impl<'de> DeserTrait<'de> for &'static dyn MyTrait {}
  |                                        +++

error: internal compiler error: /rustc-dev/347a1dbf428ab92f284e3afafacfa7eb46341a5d/compiler/rustc_trait_selection/src/solve/fulfill/derive_errors.rs:124:17: did not expect successful goal when collecting ambiguity errors for `Binder { value: ProjectionClause(Alias { kind: OpaqueTy { def_id: DefId(0:15 ~ mvce[d1ce]::test::{opaque#0}) }, args: [], .. }, Term::Ty(Alias(Yes, Alias { kind: Opaque { def_id: DefId(0:19 ~ mvce[d1ce]::testfn::{opaque#0}) }, args: ['?4, &'?2 DeserStruct, '?0], .. }))), bound_vars: [] }`
 --> /tmp/icemaker_global_tempdir.gylpnR9gPvzU/rustc_testrunner_tmpdir_reporting.3NNlYTxae64C/mvce.rs:9:14
  |
9 | fn test() -> impl Send {
  |              ^^^^^^^^^


thread 'rustc' (1293205) panicked at /rustc-dev/347a1dbf428ab92f284e3afafacfa7eb46341a5d/compiler/rustc_trait_selection/src/solve/fulfill/derive_errors.rs:124:17:
Box<dyn Any>
stack backtrace:
   0:     0x7f8092c0cea6 - <<std[9230f834c194ccdf]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[4eb08f46c2e819d3]::fmt::Display>::fmt
   1:     0x7f809320bdcf - core[4eb08f46c2e819d3]::fmt::write
   2:     0x7f8092c2211c - <std[9230f834c194ccdf]::sys::stdio::unix::Stderr as core[4eb08f46c2e819d3]::io::write::Write>::write_fmt
   3:     0x7f8092be027a - std[9230f834c194ccdf]::panicking::default_hook::{closure#0}
   4:     0x7f8092c01103 - std[9230f834c194ccdf]::panicking::default_hook
   5:     0x7f8091bb2aaf - std[9230f834c194ccdf]::panicking::update_hook::<alloc[55cb97d1958a6aa2]::boxed::Box<rustc_driver_impl[bc520c4b5b23925f]::install_ice_hook::{closure#1}>>::{closure#0}
   6:     0x7f8092c015a2 - std[9230f834c194ccdf]::panicking::panic_with_hook
   7:     0x7f8091be1024 - std[9230f834c194ccdf]::panicking::begin_panic::<rustc_errors[15685f120c8ae9c5]::ExplicitBug>::{closure#0}
   8:     0x7f8091bd9d76 - std[9230f834c194ccdf]::sys::backtrace::__rust_end_short_backtrace::<std[9230f834c194ccdf]::panicking::begin_panic<rustc_errors[15685f120c8ae9c5]::ExplicitBug>::{closure#0}, !>
   9:     0x7f8091bd9aab - std[9230f834c194ccdf]::panicking::begin_panic::<rustc_errors[15685f120c8ae9c5]::ExplicitBug>
  10:     0x7f8091beca71 - <rustc_errors[15685f120c8ae9c5]::diagnostic::BugAbort as rustc_errors[15685f120c8ae9c5]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  11:     0x7f809212b98c - <rustc_errors[15685f120c8ae9c5]::DiagCtxtHandle>::span_bug::<rustc_span[e39204562324ff34]::span_encoding::Span, alloc[55cb97d1958a6aa2]::string::String>
  12:     0x7f8092158e66 - rustc_middle[c236f446234024]::util::bug::opt_span_bug_fmt::<rustc_span[e39204562324ff34]::span_encoding::Span>::{closure#0}
  13:     0x7f8092159282 - rustc_middle[c236f446234024]::ty::context::tls::with_opt::<rustc_middle[c236f446234024]::util::bug::opt_span_bug_fmt<rustc_span[e39204562324ff34]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7f80921448b0 - rustc_middle[c236f446234024]::ty::context::tls::with_context_opt::<rustc_middle[c236f446234024]::ty::context::tls::with_opt<rustc_middle[c236f446234024]::util::bug::opt_span_bug_fmt<rustc_span[e39204562324ff34]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7f808f089268 - rustc_middle[c236f446234024]::util::bug::span_bug_fmt::<rustc_span[e39204562324ff34]::span_encoding::Span>
  16:     0x7f80943f71c4 - <rustc_trait_selection[c1480eec3b03e870]::traits::FulfillmentError as rustc_infer[7d238bc1b973467a]::traits::engine::FromSolverError<rustc_trait_selection[c1480eec3b03e870]::solve::fulfill::NextSolverError>>::from_solver_error
  17:     0x7f80943f5995 - <core[4eb08f46c2e819d3]::iter::adapters::map::Map<core[4eb08f46c2e819d3]::iter::adapters::chain::Chain<core[4eb08f46c2e819d3]::iter::adapters::map::Map<thin_vec[a87c3356013a0ff2]::Drain<(rustc_infer[7d238bc1b973467a]::traits::Obligation<rustc_middle[c236f446234024]::ty::predicate::Predicate>, core[4eb08f46c2e819d3]::option::Option<rustc_type_ir[b40821e6cb839fb2]::solve::GoalStalledOn<rustc_middle[c236f446234024]::ty::context::TyCtxt>>)>, rustc_trait_selection[c1480eec3b03e870]::solve::fulfill::collect_remaining_errors_impl<rustc_trait_selection[c1480eec3b03e870]::traits::FulfillmentError>::{closure#0}>, core[4eb08f46c2e819d3]::iter::adapters::map::Map<alloc[55cb97d1958a6aa2]::vec::drain::Drain<rustc_infer[7d238bc1b973467a]::traits::Obligation<rustc_middle[c236f446234024]::ty::predicate::Predicate>>, rustc_trait_selection[c1480eec3b03e870]::solve::fulfill::collect_remaining_errors_impl<rustc_trait_selection[c1480eec3b03e870]::traits::FulfillmentError>::{closure#1}>>, rustc_trait_selection[c1480eec3b03e870]::solve::fulfill::collect_remaining_errors_impl<rustc_trait_selection[c1480eec3b03e870]::traits::FulfillmentError>::{closure#2}> as core[4eb08f46c2e819d3]::iter::traits::iterator::Iterator>::next
  18:     0x7f80943f566f - rustc_trait_selection[c1480eec3b03e870]::solve::fulfill::collect_remaining_errors_impl::<rustc_trait_selection[c1480eec3b03e870]::traits::FulfillmentError>
  19:     0x7f8093ffc181 - rustc_hir_typeck[aa98e27d71a07d05]::typeck_with_inspect::{closure#0}
  20:     0x7f8093fee2f0 - rustc_query_impl[dcec05902d583e42]::query_vtables::typeck_root::invoke_provider_fn::__rust_begin_short_backtrace
  21:     0x7f8093fca975 - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_data_structures[fb83bf40da15a652]::vec_cache::VecCache<rustc_span[e39204562324ff34]::def_id::LocalDefId, rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[c236f446234024]::dep_graph::graph::DepNodeIndex>, false>
  22:     0x7f8093fca5e7 - rustc_query_impl[dcec05902d583e42]::query_vtables::typeck_root::execute_query_non_incr::__rust_end_short_backtrace
  23:     0x7f8093ef6c93 - rustc_mir_build[b681dc2ffd80ac32]::thir::pattern::check_match::check_match
  24:     0x7f8093ef5dbd - rustc_query_impl[dcec05902d583e42]::query_vtables::check_match::invoke_provider_fn::__rust_begin_short_backtrace
  25:     0x7f8093f1c35f - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_data_structures[fb83bf40da15a652]::vec_cache::VecCache<rustc_span[e39204562324ff34]::def_id::LocalDefId, rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 1usize]>, rustc_middle[c236f446234024]::dep_graph::graph::DepNodeIndex>, false>
  26:     0x7f8093f1c0d5 - rustc_query_impl[dcec05902d583e42]::query_vtables::check_match::execute_query_non_incr::__rust_end_short_backtrace
  27:     0x7f8093d01866 - rustc_mir_build[b681dc2ffd80ac32]::builder::build_mir_inner_impl
  28:     0x7f8093233e74 - rustc_mir_transform[cfc0ec162cbc1f8d]::mir_built
  29:     0x7f8093fca975 - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_data_structures[fb83bf40da15a652]::vec_cache::VecCache<rustc_span[e39204562324ff34]::def_id::LocalDefId, rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[c236f446234024]::dep_graph::graph::DepNodeIndex>, false>
  30:     0x7f8093fca667 - rustc_query_impl[dcec05902d583e42]::query_vtables::mir_built::execute_query_non_incr::__rust_end_short_backtrace
  31:     0x7f809322652b - rustc_mir_transform[cfc0ec162cbc1f8d]::ffi_unwind_calls::has_ffi_unwind_calls
  32:     0x7f8093225eed - rustc_query_impl[dcec05902d583e42]::query_vtables::has_ffi_unwind_calls::invoke_provider_fn::__rust_begin_short_backtrace
  33:     0x7f8093f1c35f - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_data_structures[fb83bf40da15a652]::vec_cache::VecCache<rustc_span[e39204562324ff34]::def_id::LocalDefId, rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 1usize]>, rustc_middle[c236f446234024]::dep_graph::graph::DepNodeIndex>, false>
  34:     0x7f8093f1c095 - rustc_query_impl[dcec05902d583e42]::query_vtables::has_ffi_unwind_calls::execute_query_non_incr::__rust_end_short_backtrace
  35:     0x7f8093b91891 - rustc_mir_transform[cfc0ec162cbc1f8d]::mir_promoted
  36:     0x7f8093b91712 - rustc_query_impl[dcec05902d583e42]::query_vtables::mir_promoted::invoke_provider_fn::__rust_begin_short_backtrace
  37:     0x7f80938fe403 - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_data_structures[fb83bf40da15a652]::vec_cache::VecCache<rustc_span[e39204562324ff34]::def_id::LocalDefId, rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 16usize]>, rustc_middle[c236f446234024]::dep_graph::graph::DepNodeIndex>, false>
  38:     0x7f80938fdd67 - rustc_query_impl[dcec05902d583e42]::query_vtables::mir_promoted::execute_query_non_incr::__rust_end_short_backtrace
  39:     0x7f80944b6151 - rustc_borrowck[346cca818372af1]::mir_borrowck
  40:     0x7f80944b5f99 - rustc_query_impl[dcec05902d583e42]::query_vtables::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
  41:     0x7f8093fca975 - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_data_structures[fb83bf40da15a652]::vec_cache::VecCache<rustc_span[e39204562324ff34]::def_id::LocalDefId, rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[c236f446234024]::dep_graph::graph::DepNodeIndex>, false>
  42:     0x7f8093fca4e7 - rustc_query_impl[dcec05902d583e42]::query_vtables::mir_borrowck::execute_query_non_incr::__rust_end_short_backtrace
  43:     0x7f80946151bd - rustc_hir_analysis[c40ba00d12ac69e2]::collect::type_of::opaque::find_opaque_ty_constraints_for_rpit
  44:     0x7f8094614e82 - rustc_hir_analysis[c40ba00d12ac69e2]::collect::type_of::type_of_opaque
  45:     0x7f8093272cfd - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_middle[c236f446234024]::query::caches::DefIdCache<rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 8usize]>>, false>
  46:     0x7f8093737600 - rustc_query_impl[dcec05902d583e42]::query_vtables::type_of_opaque::execute_query_non_incr::__rust_end_short_backtrace
  47:     0x7f809373b6f8 - rustc_hir_analysis[c40ba00d12ac69e2]::collect::type_of::type_of
  48:     0x7f8093744926 - rustc_query_impl[dcec05902d583e42]::query_vtables::type_of::invoke_provider_fn::__rust_begin_short_backtrace
  49:     0x7f8093272cfd - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_middle[c236f446234024]::query::caches::DefIdCache<rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 8usize]>>, false>
  50:     0x7f80932729a3 - rustc_query_impl[dcec05902d583e42]::query_vtables::type_of::execute_query_non_incr::__rust_end_short_backtrace
  51:     0x7f80946156d1 - rustc_hir_analysis[c40ba00d12ac69e2]::check::check::check_opaque
  52:     0x7f8093f26069 - rustc_hir_analysis[c40ba00d12ac69e2]::check::check::check_item_type
  53:     0x7f8093f1cd26 - rustc_hir_analysis[c40ba00d12ac69e2]::check::wfcheck::check_well_formed
  54:     0x7f8093f1cd07 - rustc_query_impl[dcec05902d583e42]::query_vtables::check_well_formed::invoke_provider_fn::__rust_begin_short_backtrace
  55:     0x7f8093f1c35f - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_data_structures[fb83bf40da15a652]::vec_cache::VecCache<rustc_span[e39204562324ff34]::def_id::LocalDefId, rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 1usize]>, rustc_middle[c236f446234024]::dep_graph::graph::DepNodeIndex>, false>
  56:     0x7f8093f1c0f1 - rustc_query_impl[dcec05902d583e42]::query_vtables::check_well_formed::execute_query_non_incr::__rust_end_short_backtrace
  57:     0x7f8093f118b8 - <rustc_middle[c236f446234024]::hir::ModuleItems>::par_opaques::<rustc_hir_analysis[c40ba00d12ac69e2]::check::wfcheck::check_type_wf::{closure#5}>
  58:     0x7f8093f1a41a - rustc_hir_analysis[c40ba00d12ac69e2]::check::wfcheck::check_type_wf
  59:     0x7f8093f19377 - rustc_query_impl[dcec05902d583e42]::query_vtables::check_type_wf::invoke_provider_fn::__rust_begin_short_backtrace
  60:     0x7f80943a0749 - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_middle[c236f446234024]::query::caches::SingleCache<rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 1usize]>>, false>
  61:     0x7f80943a052d - rustc_query_impl[dcec05902d583e42]::query_vtables::check_type_wf::execute_query_non_incr::__rust_end_short_backtrace
  62:     0x7f8093a98164 - rustc_hir_analysis[c40ba00d12ac69e2]::check_crate
  63:     0x7f8093fcbeba - rustc_interface[f5a0feaa47580fd8]::passes::analysis
  64:     0x7f80943a204a - rustc_query_impl[dcec05902d583e42]::execution::try_execute_query::<rustc_middle[c236f446234024]::query::caches::SingleCache<rustc_middle[c236f446234024]::query::erase::ErasedData<[u8; 0usize]>>, false>
  65:     0x7f80943a1deb - rustc_query_impl[dcec05902d583e42]::query_vtables::analysis::execute_query_non_incr::__rust_end_short_backtrace
  66:     0x7f809451692e - rustc_interface[f5a0feaa47580fd8]::interface::run_compiler::<(), rustc_driver_impl[bc520c4b5b23925f]::run_compiler::{closure#0}>::{closure#2}
  67:     0x7f8094564882 - std[9230f834c194ccdf]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[f5a0feaa47580fd8]::util::run_in_thread_with_globals<rustc_interface[f5a0feaa47580fd8]::util::run_in_thread_pool_with_globals<rustc_interface[f5a0feaa47580fd8]::interface::run_compiler<(), rustc_driver_impl[bc520c4b5b23925f]::run_compiler::{closure#0}>::{closure#2}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  68:     0x7f809456462d - <std[9230f834c194ccdf]::thread::lifecycle::spawn_unchecked<rustc_interface[f5a0feaa47580fd8]::util::run_in_thread_with_globals<rustc_interface[f5a0feaa47580fd8]::util::run_in_thread_pool_with_globals<rustc_interface[f5a0feaa47580fd8]::interface::run_compiler<(), rustc_driver_impl[bc520c4b5b23925f]::run_compiler::{closure#0}>::{closure#2}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[4eb08f46c2e819d3]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  69:     0x7f809456219d - <std[9230f834c194ccdf]::sys::thread::unix::Thread>::new::thread_start
  70:     0x7f808d897739 - <unknown>
  71:     0x7f808d91bedc - <unknown>
  72:                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: rustc 1.100.0-nightly (347a1dbf4 2026-08-24) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z dump-mir-dir=dir

query stack during panic:
#0 [typeck_root] type-checking `test`
#1 [check_match] match-checking `test`
#2 [mir_built] building MIR for `test`
#3 [has_ffi_unwind_calls] checking if `test` contains FFI-unwind calls
#4 [mir_promoted] promoting constants in MIR for `test`
#5 [mir_borrowck] borrow-checking `test`
#6 [type_of_opaque] computing type of opaque `test::{opaque#0}`
#7 [type_of] computing type of `test::{opaque#0}`
#8 [check_well_formed] checking that `test::{opaque#0}` is well-formed
#9 [check_type_wf] checking that types are well-formed
#10 [analysis] running analysis passes on crate `mvce`
end of query stack
error: aborting due to 4 previous errors

Some errors have detailed explanations: E0425, E0601, E0782.
For more information about an error, try `rustc --explain E0425`.

trait MyTrait {}
struct D;
impl<'de> DeserTrait<'de> for &'de DeserStruct {}

struct MyStruct;
impl MyTrait for MyStruct {}

trait DeserTrait<'DeserStruct> {}
struct DeserStruct;
impl<'de> DeserTrait<'de> for &'static /*dyn*/ MyTrait {}

fn test() -> impl Send {
    let deserializer = DeserStruct;
    let graph = testfn(&deserializer);
    graph
}

pub fn testfn<'de, D: DeserTrait<'de>>(_deserializer: D) -> impl MyTrait + 'static {
    MyStruct
}

fn main() {}

adding in the dyn fixes the ICE and makes it compile

bit smaller

trait MyTrait {}
impl MyTrait for () {}
impl<'de> DeserTrait<'de> for &'de DeserStruct {}
trait DeserTrait<'DeserStruct> {}
struct D;
struct DeserStruct;
impl DeserTrait<'_> for &'static /*dyn*/ MyTrait {}
fn test() -> impl Send {
    testfn(&DeserStruct)
}
pub fn testfn<'de, D: DeserTrait<'de>>(_deserializer: D) -> impl MyTrait + 'static {}
fn main() {}

on beta this compiles on edition 2015, 2018, errors on 21, 24
on nightly this compiles with 2015, 2018 and errors + ICEs on 2021, 2024

Rollup merge of rust-lang#162182 - amirHdev:skip-stale-stalled-obliga…

Unrolled build for #162182 in rollup 162406

Rollup merge of #162182 - amirHdev:skip-stale-stalled-obligations, r=…

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[ICE]: `did not expect successful goal when collecting ambiguity errors for` #161669

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	// inference guidance that makes other goals go from ambig -> pass, for example.
	//
	// FIXME: We should probably just look into overflows here.
	false,
	),
	Ok(GoalEvaluation { certainty: Certainty::Yes, .. }) => {
	span_bug!(
	root_obligation.cause.span,
	"did not expect successful goal when collecting ambiguity errors for `{:?}`",
	infcx.resolve_vars_if_possible(root_obligation.predicate),
	)
	}
	Err(_) => {

[ICE]: did not expect successful goal when collecting ambiguity errors for #161669

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matthiaskrgr commented on Aug 24, 2026

matthiaskrgr commented on Aug 24, 2026

matthiaskrgr commented on Aug 24, 2026

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[ICE]: `did not expect successful goal when collecting ambiguity errors for` #161669