rust-lang / rust-lang/rust

[ICE]: thread 'rustc' (20800) panicked at /rust/deps\ena-0.14.3\src\snapshot_vec.rs:53:17

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A-inference A-trait-system C-bug I-ICE needs-triage S-needs-repro T-compiler
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Description

thread 'rustc' (20800) panicked at /rust/deps\ena-0.14.3\src\snapshot_vec.rs:53:17:
assertion failed: Vec::len(self) == i
stack backtrace:
   0:     0x7ffbf83145d2 - std::backtrace_rs::backtrace::win64::trace
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1:     0x7ffbf83145d2 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ffbf83145d2 - std::sys::backtrace::_print_fmt
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\sys\backtrace.rs:74
   3:     0x7ffbf83145d2 - std::sys::backtrace::impl$0::print::impl$0::fmt
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\sys\backtrace.rs:44
   4:     0x7ffbf83298a1 - core::fmt::write
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\core\src\fmt\mod.rs:0  
   5:     0x7ffbf82dbae4 - std::io::default_write_fmt
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\io\mod.rs:639  
   6:     0x7ffbf82dbae4 - std::io::Write::write_fmt<std::sys::stdio::windows::Stderr>
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\io\mod.rs:1994 
   7:     0x7ffbf82fcf40 - std::sys::backtrace::BacktraceLock::print
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\sys\backtrace.rs:47
   8:     0x7ffbf82fcf40 - std::panicking::default_hook::closure$0
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\panicking.rs:292
   9:     0x7ffbf82fcd58 - std::panicking::default_hook
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\panicking.rs:319
  10:     0x7ffbf9acd689 - core[1860f69c40542218]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[7675aa0932531c3a]::Level, &str), usize), <((rustc_lint_defs[7675aa0932531c3a]::Level, &str), usize) as core[1860f69c40542218]::cmp::PartialOrd>::lt>
  11:     0x7ffbf82fd2b1 - std::panicking::panic_with_hook
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\panicking.rs:833
  12:     0x7ffbf82fd049 - std::panicking::panic_handler::closure$0
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\panicking.rs:691
  13:     0x7ffbf82f4abf - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::panic_handler::closure_env$0,never$>
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\sys\backtrace.rs:182
  14:     0x7ffbf82d60de - std::panicking::panic_handler
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\panicking.rs:689
  15:     0x7ffbfc549b3d - core::panicking::panic_fmt
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\core\src\panicking.rs:80
  16:     0x7ffbfc549b07 - core::panicking::panic
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\core\src\panicking.rs:150
  17:     0x7ffbf94c4bc1 - <rustc_infer[9d33c575024ef4f5]::infer::InferCtxt>::rollback_to
  18:     0x7ffbf934e0ac - RINvNvXsF_CshYMVBdHUrmP_8thin_vecINtB8_8IntoIterpENtNtNtCs25LAAAjbyGa_4core3ops4drop4Drop4drop18drop_non_singletonTINtNtCsduMATfwDN6j_11rustc_infer6traits10ObligationNtNtNtCslbwbWu2vEFm_12rustc_middle2ty9predicate9PredicateEINtNtBS_6option6OptionINtNtCs6Dx
  19:     0x7ffbf9400acf - rustc_trait_selection[1e73743279395158]::traits::project::normalize_projection_term   
  20:     0x7ffbf9462847 - <rustc_trait_selection[1e73743279395158]::traits::normalize::AssocTypeNormalizer as rustc_type_ir[4c953e587688ded6]::fold::TypeFolder<rustc_middle[f6c398a2b1747a0e]::ty::context::TyCtxt>>::fold_ty   
  21:     0x7ffbf92fd5c9 - RINvNvXsF_CshYMVBdHUrmP_8thin_vecINtB8_8IntoIterpENtNtNtCs25LAAAjbyGa_4core3ops4drop4Drop4drop18drop_non_singletonTINtNtCsduMATfwDN6j_11rustc_infer6traits10ObligationNtNtNtCslbwbWu2vEFm_12rustc_middle2ty9predicate9PredicateEINtNtBS_6option6OptionINtNtCs6Dx
  22:     0x7ffbf936fc31 - <rustc_trait_selection[1e73743279395158]::traits::engine::ObligationCtxt<rustc_trait_selection[1e73743279395158]::traits::FulfillmentError>>::new_with_diagnostics
  23:     0x7ffbf93126a8 - RINvNvXsF_CshYMVBdHUrmP_8thin_vecINtB8_8IntoIterpENtNtNtCs25LAAAjbyGa_4core3ops4drop4Drop4drop18drop_non_singletonTINtNtCsduMATfwDN6j_11rustc_infer6traits10ObligationNtNtNtCslbwbWu2vEFm_12rustc_middle2ty9predicate9PredicateEINtNtBS_6option6OptionINtNtCs6Dx
  24:     0x7ffbf934e004 - RINvNvXsF_CshYMVBdHUrmP_8thin_vecINtB8_8IntoIterpENtNtNtCs25LAAAjbyGa_4core3ops4drop4Drop4drop18drop_non_singletonTINtNtCsduMATfwDN6j_11rustc_infer6traits10ObligationNtNtNtCslbwbWu2vEFm_12rustc_middle2ty9predicate9PredicateEINtNtBS_6option6OptionINtNtCs6Dx
  25:     0x7ffbf93cdeb6 - <rustc_trait_selection[1e73743279395158]::traits::select::SelectionContext>::evaluate_root_obligation
  26:     0x7ffbf93c7723 - <rustc_trait_selection[1e73743279395158]::traits::select::SelectionContext>::evaluate_root_obligation
  27:     0x7ffbf8be6ae9 - rustc_traits[870df25fe62e0414]::evaluate_obligation::evaluate_obligation
  28:     0x7ffbf91287ae - RINvMs6_NtCshrezU2Ub55M_9hashbrown3rawINtB6_8RawTableTTNtNtNtCslbwbWu2vEFm_12rustc_middle2ty8instance8InstanceNtNtNtBX_3mir4mono14CollectionModeETINtNtNtBX_5query5erase6ErasedAhj20_ENtNtNtCsdNFGO0zp5uH_18rustc_query_system9dep_graph5graph12DepNodeIndexEEE1
  29:     0x7ffbf9161645 - RINvNtNtCsdNFGO0zp5uH_18rustc_query_system5query8plumbing17try_execute_queryINtCs6AhV3Iizo1R_16rustc_query_impl13DynamicConfigINtNtB4_6caches12DefaultCacheINtNtCs6zEgmM7F2Sg_13rustc_type_ir9canonical19CanonicalQueryInputNtNtNtCslbwbWu2vEFm_12rustc_middle2t
  30:     0x7ffbf91ed500 - rustc_query_impl[4cb40144551fb19d]::plumbing::query_key_hash_verify_all
  31:     0x7ffbf94326db - <rustc_infer[9d33c575024ef4f5]::infer::InferCtxt as rustc_trait_selection[1e73743279395158]::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation_no_overflow
  32:     0x7ffbf9432059 - <rustc_infer[9d33c575024ef4f5]::infer::InferCtxt as rustc_trait_selection[1e73743279395158]::traits::query::evaluate_obligation::InferCtxtExt>::predicate_may_hold
  33:     0x7ffbf8499ed5 - <hashbrown[e2b63d2d2398afe6]::raw::RawTable<usize>>::reserve_rehash::<indexmap[e311de0fb82bc327]::map::core::get_hash<(rustc_middle[f6c398a2b1747a0e]::ty::predicate::Predicate, rustc_middle[f6c398a2b1747a0e]::traits::ObligationCause), ()>::{closure#0}>
  34:     0x7ffbf85dee56 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  35:     0x7ffbf85f1aa7 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  36:     0x7ffbf8546e32 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  37:     0x7ffbf8500ad3 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  38:     0x7ffbf851d1e5 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  39:     0x7ffbf8500a17 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  40:     0x7ffbf851d1e5 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  41:     0x7ffbf8500a17 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  42:     0x7ffbf851d1e5 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  43:     0x7ffbf85828a1 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  44:     0x7ffbf8585246 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  45:     0x7ffbf851d13a - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  46:     0x7ffbf860abbc - rustc_hir_typeck[dc7e216ee0ac6f70]::intrinsicck::check_transmutes
  47:     0x7ffbf84b931b - <hashbrown[e2b63d2d2398afe6]::raw::RawTable<usize>>::reserve_rehash::<indexmap[e311de0fb82bc327]::map::core::get_hash<(rustc_middle[f6c398a2b1747a0e]::ty::predicate::Predicate, rustc_middle[f6c398a2b1747a0e]::traits::ObligationCause), ()>::{closure#0}>
  48:     0x7ffbf84cb660 - rustc_hir_typeck[dc7e216ee0ac6f70]::typeck
  49:     0x7ffbf9129b4b - RINvMs6_NtCshrezU2Ub55M_9hashbrown3rawINtB6_8RawTableTTNtNtNtCslbwbWu2vEFm_12rustc_middle2ty8instance8InstanceNtNtNtBX_3mir4mono14CollectionModeETINtNtNtBX_5query5erase6ErasedAhj20_ENtNtNtCsdNFGO0zp5uH_18rustc_query_system9dep_graph5graph12DepNodeIndexEEE1
  50:     0x7ffbf91bd8a2 - RINvNtNtCsdNFGO0zp5uH_18rustc_query_system5query8plumbing17try_execute_queryINtCs6AhV3Iizo1R_16rustc_query_impl13DynamicConfigINtNtCsbnTbZumv88m_21rustc_data_structures9vec_cache8VecCacheNtNtCsbAfC9rN8LBv_10rustc_span6def_id10LocalDefIdINtNtNtCslbwbWu2vEFm
  51:     0x7ffbf91f3c12 - rustc_query_impl[4cb40144551fb19d]::plumbing::query_key_hash_verify_all
  52:     0x7ffbf86686bd - rustc_hir_analysis[a775e08aa5508cb4]::check_crate
  53:     0x7ffbf835f662 - rustc_interface[5aa0ad72e16f066c]::passes::analysis
  54:     0x7ffbf7d5bf5a - <rustc_lint[9b30ddbe56c6c24d]::builtin::SpecialModuleName as rustc_lint[9b30ddbe56c6c24d]::passes::EarlyLintPass>::check_crate
  55:     0x7ffbf7d62247 - RINvNtNtCsdNFGO0zp5uH_18rustc_query_system5query8plumbing17try_execute_queryINtCs6AhV3Iizo1R_16rustc_query_impl13DynamicConfigINtNtB4_6caches11SingleCacheINtNtNtCslbwbWu2vEFm_12rustc_middle5query5erase6ErasedAhj0_EEKb0_KB3s_KB3s_ENtNtB1f_8plumbing9QueryCtx
  56:     0x7ffbf7e3c513 - rustc_query_impl[4cb40144551fb19d]::profiling_support::alloc_self_profile_query_strings
  57:     0x7ffbf587c26f - std[76a36676f23c96cf]::sys::backtrace::__rust_begin_short_backtrace::<std[76a36676f23c96cf]::thread::lifecycle::spawn_unchecked<ctrlc[107595794414e66d]::set_handler_inner<rustc_driver_impl[240853e38f7eec8f]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>       
  58:     0x7ffbf58748df - RINvNtNtCsabvxNuRDEW9_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs7Mplz9yphjk_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCs35NCoJMdRbn_17rustc_driver_i
  59:     0x7ffbf5882bc9 - std[76a36676f23c96cf]::sys::backtrace::__rust_begin_short_backtrace::<std[76a36676f23c96cf]::thread::lifecycle::spawn_unchecked<ctrlc[107595794414e66d]::set_handler_inner<rustc_driver_impl[240853e38f7eec8f]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>       
  60:     0x7ffbf82ec638 - std::sys::thread::windows::impl$0::new::thread_start
                               at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library\std\src\sys\thread\windows.rs:58
  61:     0x7ffcc20ae8d7 - BaseThreadInitThunk
  62:     0x7ffcc436c40c - RtlUserThreadStart

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: rustc 1.94.0 (4a4ef493e 2026-03-02) running on x86_64-pc-windows-msvc

note: compiler flags: --crate-type bin -C embed-bitcode=no -C strip=debuginfo

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [evaluate_obligation] evaluating trait selection obligation `core::iter::adapters::flatten::Flatten<std::fs::ReadDir>: bevy_ecs::system::IntoSystem<^c_0, ^c_1, ^c_2>`
#1 [typeck] type-checking `game::frame::load_frame_catalog_from_dir`
... and 1 other queries... use `env RUST_BACKTRACE=1` to see the full query stack

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  4. Open a pull request that references the issue number.

Research direction

Start with the reported rustc 1.94.0 Windows panic in deps\ena-0.14.3\src\snapshot_vec.rs:53:17 and the rustc_infer::InferCtxt::rollback_to stack entry. Reproduce the obligation involving Flattenstd::fs::ReadDir and bevy_ecs::system::IntoSystem while type-checking game::frame::load_frame_catalog_from_dir; done means the compiler no longer panics on a minimized case and has regression coverage.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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