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[ICE]: predicate.rs:440:9 #163206

Closed
#163228
Closed
[ICE]: predicate.rs:440:9#163206
#163228
Labels
A-diagnosticsArea: Messages for errors, warnings, and lintsC-bugCategory: This is a bug.E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.T-typesRelevant to the types team, which will review and decide on the PR/issue.fixed-by-next-solverFixed by the next-generation trait solver, `-Znext-solver`.regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.

Description

@alexander-markov-1977
alexander-markov-1977
opened on Sep 23, 2026

Code

use std::collections::HashMap;
use std::cell::{OnceCell, RefCell};

///////////////////////////////
// StatInfo - statistics
#[derive(Default, Debug, Clone, Copy)]
pub struct StatInfo  {
    total: usize,       // total size of th series
}

impl StatInfo {
    pub fn calculate<'a, I>(total: usize, iter: I) -> StatInfo where I: Iterator<Item = &'a f64> {
        StatInfo { total }
    }
}

///////////////////////////////
/// StatFrame - data frame
pub struct StatFrame<const N: usize> {
    num: Option<usize>,
    data: Vec<[f64; N]>,
    stat_info_cache: OnceCell<[StatInfo; N]>,
}

impl<const N: usize> StatFrame<N> {
    pub fn get_frame_stat_info(&self) -> [StatInfo; N] {
        let calc_fn = || {
            let mut res = [StatInfo::default(); N];
            for i in 0..N {
                res[i] = StatInfo::calculate(self.data.len(), self.data.iter().map(|f| &f[i]));
            }
            res
        };
        
        if let None = self.num {
            return calc_fn();
        }

        *self.stat_info_cache.get_or_init(calc_fn)
    }

    fn new() -> Self {
        Self{ num: None, data: Vec::new(), stat_info_cache: OnceCell::new() }
    }

    pub fn push(&mut self, value: [f64; N]) {
        self.data.push(value);
    }
}

//////////////////////////////
/// Statistics series - 
pub struct StatSeries<const N: usize> {
    headers: Vec<String>,
    frames: Vec<StatFrame<N>>,
    stat_info_cache: RefCell<HashMap<(usize, usize), [StatInfo; N]>>,
}

impl<const N: usize> StatSeries<N> {
    pub fn new<H>(headers: [H; N]) -> Self where String: for <'a> From<&'a H> {
        let headers: Vec<String> = (&headers[0..N]).iter().map(|s| String::from(s)).collect();
        Self{ headers, frames: Vec::new(), stat_info_cache: RefCell::new(HashMap::new()) }
    }

    pub fn complete_frame(&mut self, mut new_frame: StatFrame<N>) {
        new_frame.num = Some(self.frames.len());
        self.frames.push(new_frame);
    }
}

fn main() {
    let series = StatSeries::<2>::new(["time", "length"]);
    let mut writer = StatFrame::<2>::new();

    println!("Hello, world!");

    writer.push([2.0, 3.0]);
    series.complete_frame(writer);
}

Meta

rustc --version --verbose:

rustc 1.98.1 (48a229cea 2026-09-01)
binary: rustc
commit-hash: 48a229ceaefd4985c50990b14116b6d856af0985
commit-date: 2026-09-01
host: x86_64-pc-windows-msvc
release: 1.98.1
LLVM version: 22.1.8

Error output

   Compiling t v0.1.0 (C:\work\mipt\ann\t)

thread 'rustc' (40220) panicked at /rustc-dev/48a229ceaefd4985c50990b14116b6d856af0985/compiler\rustc_middle\src\ty\predicate.rs:440:9:
`TraitPredicate(<std::string::String as std::convert::From<&'a str>>, polarity:Positive)` has escaping bound vars, so it cannot be wrapped in a dummy binder.
stack backtrace:
   0:     0x7ff89c3819b9 - std::backtrace_rs::backtrace::win64::trace
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1:     0x7ff89c3819b9 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ff89c3819b9 - std::sys::backtrace::_print_fmt
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\backtrace.rs:74
   3:     0x7ff89c3819b9 - std::sys::backtrace::impl$0::print::impl$0::fmt
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\backtrace.rs:44
   4:     0x7ff89c3aa9f1 - core::fmt::write
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\core\src\fmt\mod.rs:0
   5:     0x7ff89c391874 - std::io::default_write_fmt
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\io\mod.rs:626
   6:     0x7ff89c391874 - std::io::Write::write_fmt<std::sys::stdio::windows::Stderr>
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\io\mod.rs:1730
   7:     0x7ff89c358255 - std::sys::backtrace::BacktraceLock::print
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\backtrace.rs:47
   8:     0x7ff89c358255 - std::panicking::default_hook::closure$0
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:292
   9:     0x7ff89c373bb8 - std::panicking::default_hook
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:319
  10:     0x7fffb7b6ca9b - core[6380f46c71b215e4]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[cc4061f12a820a34]::Level, &str), usize), <((rustc_lint_defs[cc4061f12a820a34]::Level, &str), usize) as core[6380f46c71b215e4]::cmp::PartialOrd>::lt>
  11:     0x7ff89c373fd4 - std::panicking::panic_with_hook
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:823
  12:     0x7ff89c35832e - std::panicking::panic_handler::closure$0
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:688
  13:     0x7ff89c3557af - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::panic_handler::closure_env$0,never$>
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\backtrace.rs:182
  14:     0x7ff89c358e7e - std::panicking::panic_handler
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:679
  15:     0x7ff89c3ce38d - core::panicking::panic_fmt
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\core\src\panicking.rs:80
  16:     0x7fffb61a6583 - <rustc_middle[fafc4954b0cce51f]::ty::predicate::Predicate as rustc_type_ir[b4770ccbd73e2fc1]::upcast::UpcastFrom<rustc_middle[fafc4954b0cce51f]::ty::context::TyCtxt, rustc_type_ir[b4770ccbd73e2fc1]::predicate::TraitPredicate<rustc_middle[fafc4954b0cce51f]::ty::context::TyCtxt>>>::upcast_from
  17:     0x7fffb9b8eb27 - RINvMs0_NtCsinu1ktnSElL_21rustc_data_structures17obligation_forestINtB6_16ObligationForestNtNtNtCs3uc0NMkBLP_21rustc_trait_selection6traits7fulfill26PendingPredicateObligationE8compressNCINvB2_19process_obligationsNtNvXs0_B1s_INtB1s_18FulfillmentContextpEI
  18:     0x7fffb9cff9c9 - <rustc_trait_selection[a7b393a2f6556b]::error_reporting::TypeErrCtxt>::fuzzy_match_tys
  19:     0x7fffb9d0560f - <rustc_trait_selection[a7b393a2f6556b]::error_reporting::TypeErrCtxt>::note_obligation_cause
  20:     0x7fffb9cec87f - <rustc_trait_selection[a7b393a2f6556b]::error_reporting::TypeErrCtxt>::report_selection_error
  21:     0x7fffb9d187c0 - <rustc_trait_selection[a7b393a2f6556b]::error_reporting::TypeErrCtxt>::report_fulfillment_errors
  22:     0x7fffb64f8dcc - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  23:     0x7fffb64da728 - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  24:     0x7fffb653f43a - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  25:     0x7fffb654453d - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  26:     0x7fffb64dae69 - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  27:     0x7fffb65e3a3d - rustc_hir_typeck[93fe51c8ee75a5c7]::intrinsicck::check_transmutes
  28:     0x7fffb64962cc - <hashbrown[aae0934c93aa5b95]::raw::RawTable<usize>>::reserve_rehash::<indexmap[6c9cd7c48621ec65]::inner::get_hash<(rustc_middle[fafc4954b0cce51f]::ty::predicate::Predicate, rustc_middle[fafc4954b0cce51f]::traits::ObligationCause), ()>::{closure#0}>
  29:     0x7fffb64aaa00 - rustc_hir_typeck[93fe51c8ee75a5c7]::typeck_root
  30:     0x7fffb71eac3b - rustc_query_impl[757a2518e15308ec]::dep_kind_vtables::make_dep_kind_vtables
  31:     0x7fffb70ebf3d - RINvMs6_NtCseFzGwGcGReH_9hashbrown3rawINtB6_8RawTableTTNtNtNtCslxZn9F6ZAXH_12rustc_middle2ty8instance8InstanceNtNtBX_4mono14CollectionModeETINtNtNtBX_5query5erase10ErasedDataAhj20_ENtNtNtBX_9dep_graph5graph12DepNodeIndexEEE14reserve_rehashNCNvMs1_NtCsinu1k
  32:     0x7fffb71eaae5 - rustc_query_impl[757a2518e15308ec]::dep_kind_vtables::make_dep_kind_vtables
  33:     0x7fffb664b7fc - rustc_hir_analysis[10dc7e69540c429d]::check_crate
  34:     0x7fffb634e190 - rustc_interface[d9e19aed855a9319]::passes::analysis
  35:     0x7fffb5e5853a - rustc_query_impl[757a2518e15308ec]::plumbing::verify_query_key_hashes
  36:     0x7fffb5d3be3c - <<rustc_ty_utils[a23332fb4bb35fd4]::opaque_types::OpaqueTypeCollector>::collect_taits_declared_in_body::TaitInBodyFinder as rustc_hir[55250e77a429a444]::intravisit::Visitor>::visit_nested_item
  37:     0x7fffb5e5848a - rustc_query_impl[757a2518e15308ec]::plumbing::verify_query_key_hashes
  38:     0x7fffb36d09e7 - std[2a1f8e54e2930f4]::sys::backtrace::__rust_begin_short_backtrace::<std[2a1f8e54e2930f4]::thread::lifecycle::spawn_unchecked<ctrlc[75dfe702384e6772]::set_handler_inner<rustc_driver_impl[9361cccfbcde1e27]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  39:     0x7fffb36c8a05 - RINvNtNtCse0R8cuyqEa_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCsiHMamp5DUIn_15rustc_interface4util26run_in_thread_with_globalsNCINvB1d_31run_in_thread_pool_with_globalsNCINvNtB1f_9interface12run_compileruNCNvCscEvGEeMUPR3_17rustc_driver_im
  40:     0x7fffb36d4a97 - std[2a1f8e54e2930f4]::sys::backtrace::__rust_begin_short_backtrace::<std[2a1f8e54e2930f4]::thread::lifecycle::spawn_unchecked<ctrlc[75dfe702384e6772]::set_handler_inner<rustc_driver_impl[9361cccfbcde1e27]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  41:     0x7ff89c37e6a3 - std::sys::thread::windows::impl$0::new::thread_start
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\thread\windows.rs:58
  42:     0x7ff8eeb4cd87 - BaseThreadInitThunk
  43:     0x7ff8efcecaec - 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 1.98.1 (48a229cea 2026-09-01) running on x86_64-pc-windows-msvc

note: compiler flags: --crate-type bin -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 [typeck_root] type-checking `main`
#1 [analysis] running analysis passes on crate `t`
end of query stack
error: could not compile `t` (bin "t")

Caused by:
  process didn't exit successfully: `C:\Users\Alexander\.rustup\toolchains\stable-x86_64-pc-windows-msvc\bin\rustc.exe --crate-name t --edition=2024 src\main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --check-cfg cfg(docsrs,test) --check-cfg "cfg(feature, values())" -C metadata=35f9c81f52acd07b --out-dir C:\work\mipt\ann\t\target\debug\deps -C incremental=C:\work\mipt\ann\t\target\debug\incremental -L dependency=C:\work\mipt\ann\t\target\debug\deps` (exit code: 101)
Backtrace 

   Compiling t v0.1.0 (C:\work\mipt\ann\t)

thread 'rustc' (19064) panicked at /rustc-dev/48a229ceaefd4985c50990b14116b6d856af0985/compiler\rustc_middle\src\ty\predicate.rs:440:9:
`TraitPredicate(<std::string::String as std::convert::From<&'a str>>, polarity:Positive)` has escaping bound vars, so it cannot be wrapped in a dummy binder.
stack backtrace:
   0:     0x7ff89c3819b9 - std::backtrace_rs::backtrace::win64::trace
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1:     0x7ff89c3819b9 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ff89c3819b9 - std::sys::backtrace::_print_fmt
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\backtrace.rs:74
   3:     0x7ff89c3819b9 - std::sys::backtrace::impl$0::print::impl$0::fmt
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\backtrace.rs:44
   4:     0x7ff89c3aa9f1 - core::fmt::write
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\core\src\fmt\mod.rs:0
   5:     0x7ff89c391874 - std::io::default_write_fmt
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\io\mod.rs:626
   6:     0x7ff89c391874 - std::io::Write::write_fmt<std::sys::stdio::windows::Stderr>
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\io\mod.rs:1730
   7:     0x7ff89c358255 - std::sys::backtrace::BacktraceLock::print
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\backtrace.rs:47
   8:     0x7ff89c358255 - std::panicking::default_hook::closure$0
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:292
   9:     0x7ff89c373bb8 - std::panicking::default_hook
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:319
  10:     0x7fffb7b6ca9b - core[6380f46c71b215e4]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[cc4061f12a820a34]::Level, &str), usize), <((rustc_lint_defs[cc4061f12a820a34]::Level, &str), usize) as core[6380f46c71b215e4]::cmp::PartialOrd>::lt>
  11:     0x7ff89c373fd4 - std::panicking::panic_with_hook
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:823
  12:     0x7ff89c35832e - std::panicking::panic_handler::closure$0
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:688
  13:     0x7ff89c3557af - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::panic_handler::closure_env$0,never$>
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\backtrace.rs:182
  14:     0x7ff89c358e7e - std::panicking::panic_handler
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\panicking.rs:679
  15:     0x7ff89c3ce38d - core::panicking::panic_fmt
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\core\src\panicking.rs:80
  16:     0x7fffb61a6583 - <rustc_middle[fafc4954b0cce51f]::ty::predicate::Predicate as rustc_type_ir[b4770ccbd73e2fc1]::upcast::UpcastFrom<rustc_middle[fafc4954b0cce51f]::ty::context::TyCtxt, rustc_type_ir[b4770ccbd73e2fc1]::predicate::TraitPredicate<rustc_middle[fafc4954b0cce51f]::ty::context::TyCtxt>>>::upcast_from
  17:     0x7fffb9b8eb27 - RINvMs0_NtCsinu1ktnSElL_21rustc_data_structures17obligation_forestINtB6_16ObligationForestNtNtNtCs3uc0NMkBLP_21rustc_trait_selection6traits7fulfill26PendingPredicateObligationE8compressNCINvB2_19process_obligationsNtNvXs0_B1s_INtB1s_18FulfillmentContextpEI
  18:     0x7fffb9cff9c9 - <rustc_trait_selection[a7b393a2f6556b]::error_reporting::TypeErrCtxt>::fuzzy_match_tys
  19:     0x7fffb9d0560f - <rustc_trait_selection[a7b393a2f6556b]::error_reporting::TypeErrCtxt>::note_obligation_cause
  20:     0x7fffb9cec87f - <rustc_trait_selection[a7b393a2f6556b]::error_reporting::TypeErrCtxt>::report_selection_error
  21:     0x7fffb9d187c0 - <rustc_trait_selection[a7b393a2f6556b]::error_reporting::TypeErrCtxt>::report_fulfillment_errors
  22:     0x7fffb64f8dcc - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  23:     0x7fffb64da728 - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  24:     0x7fffb653f43a - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  25:     0x7fffb654453d - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  26:     0x7fffb64dae69 - rustc_hir_typeck[93fe51c8ee75a5c7]::used_trait_imports
  27:     0x7fffb65e3a3d - rustc_hir_typeck[93fe51c8ee75a5c7]::intrinsicck::check_transmutes
  28:     0x7fffb64962cc - <hashbrown[aae0934c93aa5b95]::raw::RawTable<usize>>::reserve_rehash::<indexmap[6c9cd7c48621ec65]::inner::get_hash<(rustc_middle[fafc4954b0cce51f]::ty::predicate::Predicate, rustc_middle[fafc4954b0cce51f]::traits::ObligationCause), ()>::{closure#0}>
  29:     0x7fffb64aaa00 - rustc_hir_typeck[93fe51c8ee75a5c7]::typeck_root
  30:     0x7fffb71eac3b - rustc_query_impl[757a2518e15308ec]::dep_kind_vtables::make_dep_kind_vtables
  31:     0x7fffb70ebf3d - RINvMs6_NtCseFzGwGcGReH_9hashbrown3rawINtB6_8RawTableTTNtNtNtCslxZn9F6ZAXH_12rustc_middle2ty8instance8InstanceNtNtBX_4mono14CollectionModeETINtNtNtBX_5query5erase10ErasedDataAhj20_ENtNtNtBX_9dep_graph5graph12DepNodeIndexEEE14reserve_rehashNCNvMs1_NtCsinu1k
  32:     0x7fffb71eaae5 - rustc_query_impl[757a2518e15308ec]::dep_kind_vtables::make_dep_kind_vtables
  33:     0x7fffb664b7fc - rustc_hir_analysis[10dc7e69540c429d]::check_crate
  34:     0x7fffb634e190 - rustc_interface[d9e19aed855a9319]::passes::analysis
  35:     0x7fffb5e5853a - rustc_query_impl[757a2518e15308ec]::plumbing::verify_query_key_hashes
  36:     0x7fffb5d3be3c - <<rustc_ty_utils[a23332fb4bb35fd4]::opaque_types::OpaqueTypeCollector>::collect_taits_declared_in_body::TaitInBodyFinder as rustc_hir[55250e77a429a444]::intravisit::Visitor>::visit_nested_item
  37:     0x7fffb5e5848a - rustc_query_impl[757a2518e15308ec]::plumbing::verify_query_key_hashes
  38:     0x7fffb36d09e7 - std[2a1f8e54e2930f4]::sys::backtrace::__rust_begin_short_backtrace::<std[2a1f8e54e2930f4]::thread::lifecycle::spawn_unchecked<ctrlc[75dfe702384e6772]::set_handler_inner<rustc_driver_impl[9361cccfbcde1e27]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  39:     0x7fffb36c8a05 - RINvNtNtCse0R8cuyqEa_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCsiHMamp5DUIn_15rustc_interface4util26run_in_thread_with_globalsNCINvB1d_31run_in_thread_pool_with_globalsNCINvNtB1f_9interface12run_compileruNCNvCscEvGEeMUPR3_17rustc_driver_im
  40:     0x7fffb36d4a97 - std[2a1f8e54e2930f4]::sys::backtrace::__rust_begin_short_backtrace::<std[2a1f8e54e2930f4]::thread::lifecycle::spawn_unchecked<ctrlc[75dfe702384e6772]::set_handler_inner<rustc_driver_impl[9361cccfbcde1e27]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  41:     0x7ff89c37e6a3 - std::sys::thread::windows::impl$0::new::thread_start
                               at /rustc/48a229ceaefd4985c50990b14116b6d856af0985/library\std\src\sys\thread\windows.rs:58
  42:     0x7ff8eeb4cd87 - BaseThreadInitThunk
  43:     0x7ff8efcecaec - 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 1.98.1 (48a229cea 2026-09-01) running on x86_64-pc-windows-msvc

note: compiler flags: --crate-type bin -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 [typeck_root] type-checking `main`
#1 [analysis] running analysis passes on crate `t`
end of query stack
error: could not compile `t` (bin "t")

Caused by:
  process didn't exit successfully: `C:\Users\Alexander\.rustup\toolchains\stable-x86_64-pc-windows-msvc\bin\rustc.exe --crate-name t --edition=2024 src\main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --check-cfg cfg(docsrs,test) --check-cfg "cfg(feature, values())" -C metadata=35f9c81f52acd07b --out-dir C:\work\mipt\ann\t\target\debug\deps -C incremental=C:\work\mipt\ann\t\target\debug\incremental -L dependency=C:\work\mipt\ann\t\target\debug\deps` (exit code: 101)

Activity

  1. alexander-markov-1977
    added
    I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
    T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
    C-bugCategory: This is a bug.
    on Sep 23, 2026
  2. rustbot
    added
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
    on Sep 23, 2026

  3. alexander-markov-1977 commented on Sep 23, 2026

    @alexander-markov-1977
    alexander-markov-1977
    on Sep 23, 2026
    Author

    The issue repproduces on Linux respectively.

  4. maxdexh commented on Sep 23, 2026

    @maxdexh
    maxdexh
    on Sep 23, 2026
    Member

    Errors correctly in 1.80 and on next-solver

    Edit: The fixed-by-next-solver label is still not in the allowed label list :/

    @rustbot label T-types regression-from-stable-to-stable E-needs-bisection

  5. rustbot commented on Sep 23, 2026

    @rustbot
    rustbot
    on Sep 23, 2026
    Collaborator

    Error: Label fixed-by-next-solver can only be set by Rust team members

    Please file an issue on GitHub at triagebot if there's a problem with this bot, or reach out on #triagebot on Zulip.

  6. rustbot
    added
    regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.
    T-typesRelevant to the types team, which will review and decide on the PR/issue.
    I-prioritizeIssue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}
    E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc
    on Sep 23, 2026

  7. lsunsi commented on Sep 23, 2026

    @lsunsi
    lsunsi
    on Sep 23, 2026
    Contributor

    Reduced to:

    struct StatSeries {}

impl StatSeries {
    fn new<H>(headers: [H; N]) -> ()
    where
        String: for<'a> From<&'a H>,
    {
    }
}

fn main() {
    let series = StatSeries::new([""]);
}

  8. lsunsi commented on Sep 23, 2026

    @lsunsi
    lsunsi
    on Sep 23, 2026
    Contributor

    Regression in e7ef136.

    searched nightlies: from nightly-2026-04-29 to nightly-2026-09-23
    regressed nightly: nightly-2026-07-31
    searched commit range: 1a833e1...8ab9fdf
    regressed commit: be3d26d

    bisected with cargo-bisect-rustc v0.6.11

    Host triple: x86_64-unknown-linux-gnu
    Reproduce with:

    cargo bisect-rustc --start=2026-04-29 --end=2026-09-23 --regress=non-ice --without-cargo
  9. cyrgani
    added
    S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issue
    and removed
    E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc
    on Sep 23, 2026

  10. 3 remaining items

  11. maxdexh commented on Sep 23, 2026

    @maxdexh
    maxdexh
    on Sep 23, 2026
    Member

    Even though this is fixed by next-solver, it is still a stable-to-stable regression. IMO we should not just close this with a test

  12. lqd commented on Sep 23, 2026

    @lqd
    lqd
    on Sep 23, 2026
    Member

    Regression in e7ef136.

    This PR landed in 1.99 and the ICE in the OP is present on 1.98, so it seems you bisected for the fix, not the PR introducing the regression.

    IMO we should not just close this with a test

    1.99 will be stable in a week or so, and judging from beta #159049 does indeed fix the ICE. This issue will become an E-needs-test quite soon unless I'm missing something?

  13. maxdexh commented on Sep 23, 2026

    @maxdexh
    maxdexh
    on Sep 23, 2026
    Member

    1.99 will be stable in a week or so, and judging from beta #159049 does indeed fix the ICE. This issue will become an E-needs-test quite soon unless I'm missing something?

    Yup! I did not see it got fixed on old-solver already. In that case, I agree closing with test is totally the right way ^^

  14. lqd
    added
    A-diagnosticsArea: Messages for errors, warnings, and lints
    E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.
    E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc
    and removed
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
    S-has-bisectionStatus: A bisection has been found for this issue
    on Sep 23, 2026

  15. lsunsi commented on Sep 23, 2026

    @lsunsi
    lsunsi
    on Sep 23, 2026
    Contributor

    @lqd you were right, the regression was in nightly-2026-02-11.
    probably in one of these commits

    get_commits_between returning commits, len: 5
  commit[0] 2026-02-09: Auto merge of #152399 - matthiaskrgr:rollup-uDIDnAN, r=matthiaskrgr
  commit[1] 2026-02-09: Auto merge of #152324 - Keith-Cancel:mgca4, r=BoxyUwU
  commit[2] 2026-02-10: Auto merge of #152412 - JonathanBrouwer:rollup-hShycIY, r=JonathanBrouwer
  commit[3] 2026-02-10: Auto merge of #152437 - JonathanBrouwer:rollup-bWpnWOz, r=JonathanBrouwer
  commit[4] 2026-02-10: Auto merge of #151509 - Zoxc:gen-color-race, r=zetanumbers,petrochenkov
  16. lqd
    removed
    E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc
    on Sep 23, 2026
  17. JonathanBrouwer
    added a commit that references this issue on Sep 24, 2026

    Rollup merge of rust-lang#163228 - lsunsi:issue163206, r=ShoyuVanilla

    323712a
  18. apiraino
    removed
    I-prioritizeIssue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}
    on Sep 24, 2026
  19. rust-bors
    closed this as completedin #163228on Sep 24, 2026
  20. rust-bors
    added a commit that references this issue on Sep 24, 2026

    Unrolled build for #163228 in rollup 163244

    3d20485
  21. pull
    added a commit that references this issue on Sep 25, 2026

    Rollup merge of #163228 - lsunsi:issue163206, r=ShoyuVanilla

    92c205b
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    A-diagnosticsArea: Messages for errors, warnings, and lintsC-bugCategory: This is a bug.E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.T-typesRelevant to the types team, which will review and decide on the PR/issue.fixed-by-next-solverFixed by the next-generation trait solver, `-Znext-solver`.regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.

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