rustc `1.193.0-beta.1` panic during formatting

[bd-g]

When running cargo fmt with rustc 1.193.0-beta.2 on a proprietary codebase, I get a compiler panic.

• The Rust project in question has a git submodule that is registered as a dependency in the Cargo.toml file with {path = ./local/path}
• That dependencies is using Rust Edition 2021, whereas the parent Rust project is using Rust Edition 2024
• The git submodule dependency is only imported into a single file.
• When I run cargo fmt with stable 1.192.0, that single file is re-formatted from R.E. 2021 rules to R.E. 2024 rules.
• However, when I run cargo fmt with 1.193.0-beta.2, I get a compiler panic as displayed below.

rustc version	Panics?
1.192.0	No
1.193.0-beta.1	Yes
1.193.0-beta.2	Yes
1.194.0-nightly	Yes

Compiler output from 1.193.0-beta.1 panic

note: rustc 1.93.0-beta.1 (1b6e21e16 2025-12-08) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

thread 'main' (998423) panicked at compiler/rustc_parse/src/parser/item.rs:400:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: MultiSpan { primary_spans: [Span { lo: BytePos(15900), hi: BytePos(15904), ctxt: #0 }], span_labels: [(Span { lo: BytePos(15900), hi: BytePos(15904), ctxt: #0 }, Translated("expected identifier, found keyword"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(15900), hi: BytePos(15904), ctxt: #0 }, is_lint: None, long_ty_path: None, emitted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 381, col: 34 } })
stack backtrace:
   0:     0x7ff3f9491eb3 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h56dc325676d2f229
   1:     0x7ff3f9c10f08 - core::fmt::write::h1296211c79dcfe4d
   2:     0x7ff3fb0c23b6 - std::io::Write::write_fmt::h09c87e2e897f7f51
   3:     0x7ff3f945f6b5 - std::panicking::default_hook::{{closure}}::h60fe637000259840
   4:     0x7ff3f945f4e3 - std::panicking::default_hook::h62b896381ecee5ff
   5:     0x7ff3f84ea7b7 - std[5426fc87474ba969]::panicking::update_hook::<alloc[feab500cd1938842]::boxed::Box<rustc_driver_impl[c9d56e6b8d2b2f02]::install_ice_hook::{closure#1}>>::{closure#0}
   6:     0x7ff3f945f9e2 - std::panicking::panic_with_hook::h148eda47c092496f
   7:     0x7ff3f945f778 - std::panicking::panic_handler::{{closure}}::ha3c322b8140a1a72
   8:     0x7ff3f9459789 - std::sys::backtrace::__rust_end_short_backtrace::h3f9e1abc6ce6b66f
   9:     0x7ff3f943a97d - __rustc[1cd308e5081fab86]::rust_begin_unwind
  10:     0x7ff3f69e22bc - core::panicking::panic_fmt::hc375fcb7f9c166b1
  11:     0x7ff3f5e978b2 - core::result::unwrap_failed::h74dec87b3f9885a4
  12:     0x7ff3f7278bf8 - <rustc_parse[58503836e5d1806d]::parser::Parser>::recover_missing_kw_before_item
  13:     0x7ff3fa97245c - <rustc_parse[58503836e5d1806d]::parser::Parser>::parse_item_kind
  14:     0x7ff3fa971afe - <rustc_parse[58503836e5d1806d]::parser::Parser>::parse_item_kind
  15:     0x7ff3fa96d41a - <rustc_parse[58503836e5d1806d]::parser::Parser>::parse_item_common
  16:     0x7ff3fa96d02b - <rustc_parse[58503836e5d1806d]::parser::Parser>::parse_item
  17:     0x562de4d449e8 - rustfmt_nightly[1022aa65d2434ee0]::parse::macros::parse_macro_arg
  18:     0x562de4d2b4a5 - rustfmt_nightly[1022aa65d2434ee0]::macros::rewrite_macro
  19:     0x562de4d079e3 - rustfmt_nightly[1022aa65d2434ee0]::expr::format_expr
  20:     0x562de4c515c8 - rustfmt_nightly[1022aa65d2434ee0]::expr::rewrite_assign_rhs_expr::<rustc_ast[87cc9e514bfc5189]::ast::Expr>
  21:     0x562de4c53e59 - rustfmt_nightly[1022aa65d2434ee0]::expr::rewrite_assign_rhs_with::<alloc[feab500cd1938842]::string::String, rustc_ast[87cc9e514bfc5189]::ast::Expr>
  22:     0x562de4d465b7 - <rustc_ast[87cc9e514bfc5189]::ast::Local as rustfmt_nightly[1022aa65d2434ee0]::rewrite::Rewrite>::rewrite_result
  23:     0x562de4d122bd - rustfmt_nightly[1022aa65d2434ee0]::stmt::format_stmt
  24:     0x562de4cb42b0 - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  25:     0x562de4cb72e1 - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::visit_block
  26:     0x562de4d10e5d - rustfmt_nightly[1022aa65d2434ee0]::expr::rewrite_block_with_visitor
  27:     0x562de4d0fb11 - rustfmt_nightly[1022aa65d2434ee0]::expr::rewrite_block_inner
  28:     0x562de4d08909 - rustfmt_nightly[1022aa65d2434ee0]::expr::format_expr
  29:     0x562de4c5179c - rustfmt_nightly[1022aa65d2434ee0]::expr::rewrite_assign_rhs_expr::<rustc_ast[87cc9e514bfc5189]::ast::Expr>
  30:     0x562de4c53e59 - rustfmt_nightly[1022aa65d2434ee0]::expr::rewrite_assign_rhs_with::<alloc[feab500cd1938842]::string::String, rustc_ast[87cc9e514bfc5189]::ast::Expr>
  31:     0x562de4d465b7 - <rustc_ast[87cc9e514bfc5189]::ast::Local as rustfmt_nightly[1022aa65d2434ee0]::rewrite::Rewrite>::rewrite_result
  32:     0x562de4d122bd - rustfmt_nightly[1022aa65d2434ee0]::stmt::format_stmt
  33:     0x562de4cb42b0 - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  34:     0x562de4cb481b - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  35:     0x562de4cb481b - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  36:     0x562de4cb481b - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  37:     0x562de4cb481b - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  38:     0x562de4cb481b - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  39:     0x562de4cb481b - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  40:     0x562de4cb481b - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  41:     0x562de4cb481b - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_stmts
  42:     0x562de4cb72e1 - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::visit_block
  43:     0x562de4cb9193 - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::visit_fn
  44:     0x562de4cb3220 - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::visit_item
  45:     0x562de4cfb3e3 - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::visit_items_with_reordering
  46:     0x562de4cb7c90 - <rustfmt_nightly[1022aa65d2434ee0]::visitor::FmtVisitor>::walk_mod_items
  47:     0x562de4c36817 - <rustfmt_nightly[1022aa65d2434ee0]::Session<std[5426fc87474ba969]::io::stdio::Stdout>>::format_input_inner::{closure#0}
  48:     0x562de4c27fa7 - rustfmt[a4f69f47555bc08c]::format_and_emit_report::<std[5426fc87474ba969]::io::stdio::Stdout>
  49:     0x562de4c3bd80 - rustfmt[a4f69f47555bc08c]::execute
  50:     0x562de4c38580 - rustfmt[a4f69f47555bc08c]::main
  51:     0x562de4c33343 - std[5426fc87474ba969]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  52:     0x562de4c33a29 - std[5426fc87474ba969]::rt::lang_start::<()>::{closure#0}
  53:     0x7ff3fad393e6 - std::rt::lang_start_internal::hafbfc87787530005
  54:     0x562de4c47388 - main
  55:     0x7ff3f462a47e - __libc_start_call_main
  56:     0x7ff3f462a539 - __libc_start_main_alias_1
  57:     0x562de4b2aed9 - <unknown>
  58:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

[ytmimi]

@bd-g please post a small code snippet that can be used to reproduce the panic. From the backtrace it looks like something is going wrong when trying to format a macro call so maybe you can dig through the codebase to find which one is causing the panic.

Also, it looks like this is failing in the rustc parser so you might want to report a bug in the compiler.

[ales-otf]

same here with rustc 1.94.0-nightly (21ff67df1 2025-12-15)

rustc-ice-2025-12-16T12_12_40-9714.txt

thread 'main' (45388) panicked at compiler/rustc_parse/src/parser/item.rs:401:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: Mult
iSpan { primary_spans: [Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }], span_labels: [(Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }, Translated("expected identifier, found keywor
d"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }, is_lint: None, long_ty_path: None, em
itted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 376, col: 34 } })
stack backtrace:
   0:        0x10f0655f4 - <<std[5279335577dd56df]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[7db2d337c090825e]::fmt::Display>::fmt
   1:        0x10c391e64 - core[7db2d337c090825e]::fmt::write
   2:        0x10f07c34c - <std[5279335577dd56df]::sys::stdio::unix::Stderr as std[5279335577dd56df]::io::Write>::write_fmt
   3:        0x10f03cc08 - std[5279335577dd56df]::panicking::default_hook::{closure#0}
   4:        0x10f0581dc - std[5279335577dd56df]::panicking::default_hook
   5:        0x10cf2ea30 - std[5279335577dd56df]::panicking::update_hook::<alloc[5d3371cc0d569cc0]::boxed::Box<rustc_driver_impl[e895074a6881ad0]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10f058540 - std[5279335577dd56df]::panicking::panic_with_hook
   7:        0x10f03ccb0 - std[5279335577dd56df]::panicking::panic_handler::{closure#0}
   8:        0x10f0319f0 - std[5279335577dd56df]::sys::backtrace::__rust_end_short_backtrace::<std[5279335577dd56df]::panicking::panic_handler::{closure#0}, !>
   9:        0x10f03e2c4 - __rustc[c625ac833ac53d73]::rust_begin_unwind
  10:        0x111db1814 - core[7db2d337c090825e]::panicking::panic_fmt
  11:        0x111db157c - core[7db2d337c090825e]::result::unwrap_failed
  12:        0x10e1d7f9c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::recover_missing_kw_before_item
  13:        0x10e1c8598 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  14:        0x10e1c8548 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  15:        0x10e1cb960 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_common
  16:        0x10e1c260c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_
  17:        0x10e1c246c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item
  18:        0x100606ea8 - rustfmt_nightly[b90a53db050a1ba0]::parse::macros::parse_macro_arg
  19:        0x1005f2eb8 - rustfmt_nightly[b90a53db050a1ba0]::macros::rewrite_macro
  20:        0x1005d79ec - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  21:        0x1005df404 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  22:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  23:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  24:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  25:        0x1005de448 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_block_with_visitor
  26:        0x1005d85a0 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  27:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  28:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  29:        0x100600780 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  30:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  31:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  32:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  33:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  34:        0x100600654 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  35:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  36:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  37:        0x10055c444 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_expr::<rustc_ast[953edcf441bbf503]::ast::Expr>
  38:        0x10055e0cc - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_with::<alloc[5d3371cc0d569cc0]::string::String, rustc_ast[953edcf441bbf503]::ast::Expr>
  39:        0x100608868 - <rustc_ast[953edcf441bbf503]::ast::Local as rustfmt_nightly[b90a53db050a1ba0]::rewrite::Rewrite>::rewrite_result
  40:        0x1005df4c4 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  41:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  42:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  43:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  44:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  45:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  46:        0x10059bae4 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_fn
  47:        0x100596c4c - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_item
  48:        0x1005cdbd8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_items_with_reordering
  49:        0x10059a868 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_mod_items
  50:        0x10052a7dc - <scoped_tls[f6338255df284e9c]::ScopedKey<rustc_span[a3b7f6d94349d76e]::SessionGlobals>>::with::<<rustfmt_nightly[b90a53db050a1ba0]::Session<std[5279335577dd56df]::io::stdio::Stdout
>>::format_input_inner::{closure#0}, core[7db2d337c090825e]::result::Result<rustfmt_nightly[b90a53db050a1ba0]::FormatReport, rustfmt_nightly[b90a53db050a1ba0]::ErrorKind>>
  51:        0x100526bd0 - rustfmt[49b236f867ef773a]::format_and_emit_report::<std[5279335577dd56df]::io::stdio::Stdout>
  52:        0x1005377bc - rustfmt[49b236f867ef773a]::execute
  53:        0x1005346a4 - rustfmt[49b236f867ef773a]::main
  54:        0x1005330ec - std[5279335577dd56df]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  55:        0x100533638 - std[5279335577dd56df]::rt::lang_start::<()>::{closure#0}
  56:        0x10f056bb0 - std[5279335577dd56df]::rt::lang_start_internal
  57:        0x100540c30 - _main

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

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

note: please attach the file at `/Users/alestsurko/Desktop/subtensor/rustc-ice-2025-12-16T12_12_40-9714.txt` to your bug report

query stack during panic:
end of query stack

thread 'main' (45388) panicked at compiler/rustc_parse/src/parser/item.rs:401:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: Mult
iSpan { primary_spans: [Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }], span_labels: [(Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }, Translated("expected identifier, found keywor
d"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }, is_lint: None, long_ty_path: None, em
itted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 376, col: 34 } })
stack backtrace:
   0:        0x10f0655f4 - <<std[5279335577dd56df]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[7db2d337c090825e]::fmt::Display>::fmt
   1:        0x10c391e64 - core[7db2d337c090825e]::fmt::write
   2:        0x10f07c34c - <std[5279335577dd56df]::sys::stdio::unix::Stderr as std[5279335577dd56df]::io::Write>::write_fmt
   3:        0x10f03cc08 - std[5279335577dd56df]::panicking::default_hook::{closure#0}
   4:        0x10f0581dc - std[5279335577dd56df]::panicking::default_hook
   5:        0x10cf2ea30 - std[5279335577dd56df]::panicking::update_hook::<alloc[5d3371cc0d569cc0]::boxed::Box<rustc_driver_impl[e895074a6881ad0]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10f058540 - std[5279335577dd56df]::panicking::panic_with_hook
   7:        0x10f03ccb0 - std[5279335577dd56df]::panicking::panic_handler::{closure#0}
   8:        0x10f0319f0 - std[5279335577dd56df]::sys::backtrace::__rust_end_short_backtrace::<std[5279335577dd56df]::panicking::panic_handler::{closure#0}, !>
   9:        0x10f03e2c4 - __rustc[c625ac833ac53d73]::rust_begin_unwind
  10:        0x111db1814 - core[7db2d337c090825e]::panicking::panic_fmt
  11:        0x111db157c - core[7db2d337c090825e]::result::unwrap_failed
  12:        0x10e1d7f9c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::recover_missing_kw_before_item
  13:        0x10e1c8598 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  14:        0x10e1c8548 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  15:        0x10e1cb960 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_common
  16:        0x10e1c260c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_
  17:        0x10e1c246c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item
  18:        0x100606ea8 - rustfmt_nightly[b90a53db050a1ba0]::parse::macros::parse_macro_arg
  19:        0x1005f2eb8 - rustfmt_nightly[b90a53db050a1ba0]::macros::rewrite_macro
  20:        0x1005d79ec - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  21:        0x1005df404 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  22:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  23:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  24:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  25:        0x1005de448 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_block_with_visitor
  26:        0x1005d85a0 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  27:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  28:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  29:        0x100600780 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  30:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  31:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  32:        0x10060119c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  33:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  34:        0x100600654 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  35:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  36:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  37:        0x10055c444 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_expr::<rustc_ast[953edcf441bbf503]::ast::Expr>
  38:        0x10055e0cc - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_with::<alloc[5d3371cc0d569cc0]::string::String, rustc_ast[953edcf441bbf503]::ast::Expr>
  39:        0x100608868 - <rustc_ast[953edcf441bbf503]::ast::Local as rustfmt_nightly[b90a53db050a1ba0]::rewrite::Rewrite>::rewrite_result
  40:        0x1005df4c4 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  41:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  42:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  43:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  44:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  45:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  46:        0x10059bae4 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_fn
  47:        0x100596c4c - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_item
  48:        0x1005cdbd8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_items_with_reordering
  49:        0x10059a868 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_mod_items
  50:        0x10052a7dc - <scoped_tls[f6338255df284e9c]::ScopedKey<rustc_span[a3b7f6d94349d76e]::SessionGlobals>>::with::<<rustfmt_nightly[b90a53db050a1ba0]::Session<std[5279335577dd56df]::io::stdio::Stdout
>>::format_input_inner::{closure#0}, core[7db2d337c090825e]::result::Result<rustfmt_nightly[b90a53db050a1ba0]::FormatReport, rustfmt_nightly[b90a53db050a1ba0]::ErrorKind>>
  51:        0x100526bd0 - rustfmt[49b236f867ef773a]::format_and_emit_report::<std[5279335577dd56df]::io::stdio::Stdout>
  52:        0x1005377bc - rustfmt[49b236f867ef773a]::execute
  53:        0x1005346a4 - rustfmt[49b236f867ef773a]::main
  54:        0x1005330ec - std[5279335577dd56df]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  55:        0x100533638 - std[5279335577dd56df]::rt::lang_start::<()>::{closure#0}
  56:        0x10f056bb0 - std[5279335577dd56df]::rt::lang_start_internal
  57:        0x100540c30 - _main

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

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

note: please attach the file at `/Users/alestsurko/Desktop/subtensor/rustc-ice-2025-12-16T12_12_40-9714.txt` to your bug report

query stack during panic:
end of query stack

thread 'main' (45388) panicked at compiler/rustc_parse/src/parser/item.rs:401:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: Mult
iSpan { primary_spans: [Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }], span_labels: [(Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }, Translated("expected identifier, found keywor
d"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }, is_lint: None, long_ty_path: None, em
itted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 376, col: 34 } })
stack backtrace:
   0:        0x10f0655f4 - <<std[5279335577dd56df]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[7db2d337c090825e]::fmt::Display>::fmt
   1:        0x10c391e64 - core[7db2d337c090825e]::fmt::write
   2:        0x10f07c34c - <std[5279335577dd56df]::sys::stdio::unix::Stderr as std[5279335577dd56df]::io::Write>::write_fmt
   3:        0x10f03cc08 - std[5279335577dd56df]::panicking::default_hook::{closure#0}
   4:        0x10f0581dc - std[5279335577dd56df]::panicking::default_hook
   5:        0x10cf2ea30 - std[5279335577dd56df]::panicking::update_hook::<alloc[5d3371cc0d569cc0]::boxed::Box<rustc_driver_impl[e895074a6881ad0]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10f058540 - std[5279335577dd56df]::panicking::panic_with_hook
   7:        0x10f03ccb0 - std[5279335577dd56df]::panicking::panic_handler::{closure#0}
   8:        0x10f0319f0 - std[5279335577dd56df]::sys::backtrace::__rust_end_short_backtrace::<std[5279335577dd56df]::panicking::panic_handler::{closure#0}, !>
   9:        0x10f03e2c4 - __rustc[c625ac833ac53d73]::rust_begin_unwind
  10:        0x111db1814 - core[7db2d337c090825e]::panicking::panic_fmt
  11:        0x111db157c - core[7db2d337c090825e]::result::unwrap_failed
  12:        0x10e1d7f9c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::recover_missing_kw_before_item
  13:        0x10e1c8598 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  14:        0x10e1c8548 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  15:        0x10e1cb960 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_common
  16:        0x10e1c260c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_
  17:        0x10e1c246c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item
  18:        0x100606ea8 - rustfmt_nightly[b90a53db050a1ba0]::parse::macros::parse_macro_arg
  19:        0x1005f2eb8 - rustfmt_nightly[b90a53db050a1ba0]::macros::rewrite_macro
  20:        0x1005d79ec - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  21:        0x1005df404 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  22:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  23:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  24:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  25:        0x1005de448 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_block_with_visitor
  26:        0x1005d85a0 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  27:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  28:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  29:        0x100600780 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  30:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  31:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  32:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  33:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  34:        0x100600654 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  35:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  36:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  37:        0x10055c59c - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_expr::<rustc_ast[953edcf441bbf503]::ast::Expr>
  38:        0x10055e0cc - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_with::<alloc[5d3371cc0d569cc0]::string::String, rustc_ast[953edcf441bbf503]::ast::Expr>
  39:        0x100608868 - <rustc_ast[953edcf441bbf503]::ast::Local as rustfmt_nightly[b90a53db050a1ba0]::rewrite::Rewrite>::rewrite_result
  40:        0x1005df4c4 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  41:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  42:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  43:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  44:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  45:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  46:        0x10059bae4 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_fn
  47:        0x100596c4c - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_item
  48:        0x1005cdbd8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_items_with_reordering
  49:        0x10059a868 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_mod_items
  50:        0x10052a7dc - <scoped_tls[f6338255df284e9c]::ScopedKey<rustc_span[a3b7f6d94349d76e]::SessionGlobals>>::with::<<rustfmt_nightly[b90a53db050a1ba0]::Session<std[5279335577dd56df]::io::stdio::Stdout
>>::format_input_inner::{closure#0}, core[7db2d337c090825e]::result::Result<rustfmt_nightly[b90a53db050a1ba0]::FormatReport, rustfmt_nightly[b90a53db050a1ba0]::ErrorKind>>
  51:        0x100526bd0 - rustfmt[49b236f867ef773a]::format_and_emit_report::<std[5279335577dd56df]::io::stdio::Stdout>
  52:        0x1005377bc - rustfmt[49b236f867ef773a]::execute
  53:        0x1005346a4 - rustfmt[49b236f867ef773a]::main
  54:        0x1005330ec - std[5279335577dd56df]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  55:        0x100533638 - std[5279335577dd56df]::rt::lang_start::<()>::{closure#0}
  56:        0x10f056bb0 - std[5279335577dd56df]::rt::lang_start_internal
  57:        0x100540c30 - _main

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

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

note: please attach the file at `/Users/alestsurko/Desktop/subtensor/rustc-ice-2025-12-16T12_12_40-9714.txt` to your bug report

query stack during panic:
end of query stack

thread 'main' (45388) panicked at compiler/rustc_parse/src/parser/item.rs:401:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: Mult
iSpan { primary_spans: [Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }], span_labels: [(Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }, Translated("expected identifier, found keywor
d"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(242092), hi: BytePos(242096), ctxt: #0 }, is_lint: None, long_ty_path: None, em
itted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 376, col: 34 } })
stack backtrace:
   0:        0x10f0655f4 - <<std[5279335577dd56df]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[7db2d337c090825e]::fmt::Display>::fmt
   1:        0x10c391e64 - core[7db2d337c090825e]::fmt::write
   2:        0x10f07c34c - <std[5279335577dd56df]::sys::stdio::unix::Stderr as std[5279335577dd56df]::io::Write>::write_fmt
   3:        0x10f03cc08 - std[5279335577dd56df]::panicking::default_hook::{closure#0}
   4:        0x10f0581dc - std[5279335577dd56df]::panicking::default_hook
   5:        0x10cf2ea30 - std[5279335577dd56df]::panicking::update_hook::<alloc[5d3371cc0d569cc0]::boxed::Box<rustc_driver_impl[e895074a6881ad0]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10f058540 - std[5279335577dd56df]::panicking::panic_with_hook
   7:        0x10f03ccb0 - std[5279335577dd56df]::panicking::panic_handler::{closure#0}
   8:        0x10f0319f0 - std[5279335577dd56df]::sys::backtrace::__rust_end_short_backtrace::<std[5279335577dd56df]::panicking::panic_handler::{closure#0}, !>
   9:        0x10f03e2c4 - __rustc[c625ac833ac53d73]::rust_begin_unwind
  10:        0x111db1814 - core[7db2d337c090825e]::panicking::panic_fmt
  11:        0x111db157c - core[7db2d337c090825e]::result::unwrap_failed
  12:        0x10e1d7f9c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::recover_missing_kw_before_item
  13:        0x10e1c8598 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  14:        0x10e1c8548 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  15:        0x10e1cb960 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_common
  16:        0x10e1c260c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_
  17:        0x10e1c246c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item
  18:        0x100606ea8 - rustfmt_nightly[b90a53db050a1ba0]::parse::macros::parse_macro_arg
  19:        0x1005f2eb8 - rustfmt_nightly[b90a53db050a1ba0]::macros::rewrite_macro
  20:        0x1005d79ec - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  21:        0x1005df404 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  22:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  23:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  24:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  25:        0x1005de448 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_block_with_visitor
  26:        0x1005d85a0 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  27:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  28:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  29:        0x100600780 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  30:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  31:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  32:        0x10060119c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  33:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  34:        0x100600654 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  35:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  36:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  37:        0x10055c59c - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_expr::<rustc_ast[953edcf441bbf503]::ast::Expr>
  38:        0x10055e0cc - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_with::<alloc[5d3371cc0d569cc0]::string::String, rustc_ast[953edcf441bbf503]::ast::Expr>
  39:        0x100608868 - <rustc_ast[953edcf441bbf503]::ast::Local as rustfmt_nightly[b90a53db050a1ba0]::rewrite::Rewrite>::rewrite_result
  40:        0x1005df4c4 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  41:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  42:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  43:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  44:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  45:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  46:        0x10059bae4 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_fn
  47:        0x100596c4c - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_item
  48:        0x1005cdbd8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_items_with_reordering
  49:        0x10059a868 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_mod_items
  50:        0x10052a7dc - <scoped_tls[f6338255df284e9c]::ScopedKey<rustc_span[a3b7f6d94349d76e]::SessionGlobals>>::with::<<rustfmt_nightly[b90a53db050a1ba0]::Session<std[5279335577dd56df]::io::stdio::Stdout
>>::format_input_inner::{closure#0}, core[7db2d337c090825e]::result::Result<rustfmt_nightly[b90a53db050a1ba0]::FormatReport, rustfmt_nightly[b90a53db050a1ba0]::ErrorKind>>
  51:        0x100526bd0 - rustfmt[49b236f867ef773a]::format_and_emit_report::<std[5279335577dd56df]::io::stdio::Stdout>
  52:        0x1005377bc - rustfmt[49b236f867ef773a]::execute
  53:        0x1005346a4 - rustfmt[49b236f867ef773a]::main
  54:        0x1005330ec - std[5279335577dd56df]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  55:        0x100533638 - std[5279335577dd56df]::rt::lang_start::<()>::{closure#0}
  56:        0x10f056bb0 - std[5279335577dd56df]::rt::lang_start_internal
  57:        0x100540c30 - _main

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

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

note: please attach the file at `/Users/alestsurko/Desktop/subtensor/rustc-ice-2025-12-16T12_12_40-9714.txt` to your bug report

query stack during panic:
end of query stack

thread 'main' (45388) panicked at compiler/rustc_parse/src/parser/item.rs:401:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: Mult
iSpan { primary_spans: [Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }], span_labels: [(Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }, Translated("expected identifier, found keywor
d"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }, is_lint: None, long_ty_path: None, em
itted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 376, col: 34 } })
stack backtrace:
   0:        0x10f0655f4 - <<std[5279335577dd56df]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[7db2d337c090825e]::fmt::Display>::fmt
   1:        0x10c391e64 - core[7db2d337c090825e]::fmt::write
   2:        0x10f07c34c - <std[5279335577dd56df]::sys::stdio::unix::Stderr as std[5279335577dd56df]::io::Write>::write_fmt
   3:        0x10f03cc08 - std[5279335577dd56df]::panicking::default_hook::{closure#0}
   4:        0x10f0581dc - std[5279335577dd56df]::panicking::default_hook
   5:        0x10cf2ea30 - std[5279335577dd56df]::panicking::update_hook::<alloc[5d3371cc0d569cc0]::boxed::Box<rustc_driver_impl[e895074a6881ad0]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10f058540 - std[5279335577dd56df]::panicking::panic_with_hook
   7:        0x10f03ccb0 - std[5279335577dd56df]::panicking::panic_handler::{closure#0}
   8:        0x10f0319f0 - std[5279335577dd56df]::sys::backtrace::__rust_end_short_backtrace::<std[5279335577dd56df]::panicking::panic_handler::{closure#0}, !>
   9:        0x10f03e2c4 - __rustc[c625ac833ac53d73]::rust_begin_unwind
  10:        0x111db1814 - core[7db2d337c090825e]::panicking::panic_fmt
  11:        0x111db157c - core[7db2d337c090825e]::result::unwrap_failed
  12:        0x10e1d7f9c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::recover_missing_kw_before_item
  13:        0x10e1c8598 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  14:        0x10e1c8548 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  15:        0x10e1cb960 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_common
  16:        0x10e1c260c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_
  17:        0x10e1c246c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item
  18:        0x100606ea8 - rustfmt_nightly[b90a53db050a1ba0]::parse::macros::parse_macro_arg
  19:        0x1005f2eb8 - rustfmt_nightly[b90a53db050a1ba0]::macros::rewrite_macro
  20:        0x1005d79ec - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  21:        0x1005df404 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  22:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  23:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  24:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  25:        0x1005de448 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_block_with_visitor
  26:        0x1005d85a0 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  27:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  28:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  29:        0x100600780 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  30:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  31:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  32:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  33:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  34:        0x100600654 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  35:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  36:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  37:        0x10055c444 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_expr::<rustc_ast[953edcf441bbf503]::ast::Expr>
  38:        0x10055e0cc - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_with::<alloc[5d3371cc0d569cc0]::string::String, rustc_ast[953edcf441bbf503]::ast::Expr>
  39:        0x100608868 - <rustc_ast[953edcf441bbf503]::ast::Local as rustfmt_nightly[b90a53db050a1ba0]::rewrite::Rewrite>::rewrite_result
  40:        0x1005df4c4 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  41:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  42:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  43:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  44:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  45:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  46:        0x10059bae4 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_fn
  47:        0x100596c4c - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_item
  48:        0x1005cdbd8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_items_with_reordering
  49:        0x10059a868 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_mod_items
  50:        0x10052a7dc - <scoped_tls[f6338255df284e9c]::ScopedKey<rustc_span[a3b7f6d94349d76e]::SessionGlobals>>::with::<<rustfmt_nightly[b90a53db050a1ba0]::Session<std[5279335577dd56df]::io::stdio::Stdout
>>::format_input_inner::{closure#0}, core[7db2d337c090825e]::result::Result<rustfmt_nightly[b90a53db050a1ba0]::FormatReport, rustfmt_nightly[b90a53db050a1ba0]::ErrorKind>>
  51:        0x100526bd0 - rustfmt[49b236f867ef773a]::format_and_emit_report::<std[5279335577dd56df]::io::stdio::Stdout>
  52:        0x1005377bc - rustfmt[49b236f867ef773a]::execute
  53:        0x1005346a4 - rustfmt[49b236f867ef773a]::main
  54:        0x1005330ec - std[5279335577dd56df]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  55:        0x100533638 - std[5279335577dd56df]::rt::lang_start::<()>::{closure#0}
  56:        0x10f056bb0 - std[5279335577dd56df]::rt::lang_start_internal
  57:        0x100540c30 - _main

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

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

note: please attach the file at `/Users/alestsurko/Desktop/subtensor/rustc-ice-2025-12-16T12_12_40-9714.txt` to your bug report

query stack during panic:
end of query stack

thread 'main' (45388) panicked at compiler/rustc_parse/src/parser/item.rs:401:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: Mult
iSpan { primary_spans: [Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }], span_labels: [(Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }, Translated("expected identifier, found keywor
d"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }, is_lint: None, long_ty_path: None, em
itted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 376, col: 34 } })
stack backtrace:
   0:        0x10f0655f4 - <<std[5279335577dd56df]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[7db2d337c090825e]::fmt::Display>::fmt
   1:        0x10c391e64 - core[7db2d337c090825e]::fmt::write
   2:        0x10f07c34c - <std[5279335577dd56df]::sys::stdio::unix::Stderr as std[5279335577dd56df]::io::Write>::write_fmt
   3:        0x10f03cc08 - std[5279335577dd56df]::panicking::default_hook::{closure#0}
   4:        0x10f0581dc - std[5279335577dd56df]::panicking::default_hook
   5:        0x10cf2ea30 - std[5279335577dd56df]::panicking::update_hook::<alloc[5d3371cc0d569cc0]::boxed::Box<rustc_driver_impl[e895074a6881ad0]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10f058540 - std[5279335577dd56df]::panicking::panic_with_hook
   7:        0x10f03ccb0 - std[5279335577dd56df]::panicking::panic_handler::{closure#0}
   8:        0x10f0319f0 - std[5279335577dd56df]::sys::backtrace::__rust_end_short_backtrace::<std[5279335577dd56df]::panicking::panic_handler::{closure#0}, !>
   9:        0x10f03e2c4 - __rustc[c625ac833ac53d73]::rust_begin_unwind
  10:        0x111db1814 - core[7db2d337c090825e]::panicking::panic_fmt
  11:        0x111db157c - core[7db2d337c090825e]::result::unwrap_failed
  12:        0x10e1d7f9c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::recover_missing_kw_before_item
  13:        0x10e1c8598 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  14:        0x10e1c8548 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  15:        0x10e1cb960 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_common
  16:        0x10e1c260c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_
  17:        0x10e1c246c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item
  18:        0x100606ea8 - rustfmt_nightly[b90a53db050a1ba0]::parse::macros::parse_macro_arg
  19:        0x1005f2eb8 - rustfmt_nightly[b90a53db050a1ba0]::macros::rewrite_macro
  20:        0x1005d79ec - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  21:        0x1005df404 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  22:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  23:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  24:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  25:        0x1005de448 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_block_with_visitor
  26:        0x1005d85a0 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  27:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  28:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  29:        0x100600780 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  30:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  31:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  32:        0x10060119c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  33:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  34:        0x100600654 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  35:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  36:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  37:        0x10055c444 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_expr::<rustc_ast[953edcf441bbf503]::ast::Expr>
  38:        0x10055e0cc - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_with::<alloc[5d3371cc0d569cc0]::string::String, rustc_ast[953edcf441bbf503]::ast::Expr>
  39:        0x100608868 - <rustc_ast[953edcf441bbf503]::ast::Local as rustfmt_nightly[b90a53db050a1ba0]::rewrite::Rewrite>::rewrite_result
  40:        0x1005df4c4 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  41:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  42:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  43:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  44:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  45:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  46:        0x10059bae4 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_fn
  47:        0x100596c4c - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_item
  48:        0x1005cdbd8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_items_with_reordering
  49:        0x10059a868 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_mod_items
  50:        0x10052a7dc - <scoped_tls[f6338255df284e9c]::ScopedKey<rustc_span[a3b7f6d94349d76e]::SessionGlobals>>::with::<<rustfmt_nightly[b90a53db050a1ba0]::Session<std[5279335577dd56df]::io::stdio::Stdout
>>::format_input_inner::{closure#0}, core[7db2d337c090825e]::result::Result<rustfmt_nightly[b90a53db050a1ba0]::FormatReport, rustfmt_nightly[b90a53db050a1ba0]::ErrorKind>>
  51:        0x100526bd0 - rustfmt[49b236f867ef773a]::format_and_emit_report::<std[5279335577dd56df]::io::stdio::Stdout>
  52:        0x1005377bc - rustfmt[49b236f867ef773a]::execute
  53:        0x1005346a4 - rustfmt[49b236f867ef773a]::main
  54:        0x1005330ec - std[5279335577dd56df]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  55:        0x100533638 - std[5279335577dd56df]::rt::lang_start::<()>::{closure#0}
  56:        0x10f056bb0 - std[5279335577dd56df]::rt::lang_start_internal
  57:        0x100540c30 - _main

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

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

note: please attach the file at `/Users/alestsurko/Desktop/subtensor/rustc-ice-2025-12-16T12_12_40-9714.txt` to your bug report

query stack during panic:
end of query stack

thread 'main' (45388) panicked at compiler/rustc_parse/src/parser/item.rs:401:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: Mult
iSpan { primary_spans: [Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }], span_labels: [(Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }, Translated("expected identifier, found keywor
d"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }, is_lint: None, long_ty_path: None, em
itted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 376, col: 34 } })
stack backtrace:
   0:        0x10f0655f4 - <<std[5279335577dd56df]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[7db2d337c090825e]::fmt::Display>::fmt
   1:        0x10c391e64 - core[7db2d337c090825e]::fmt::write
   2:        0x10f07c34c - <std[5279335577dd56df]::sys::stdio::unix::Stderr as std[5279335577dd56df]::io::Write>::write_fmt
   3:        0x10f03cc08 - std[5279335577dd56df]::panicking::default_hook::{closure#0}
   4:        0x10f0581dc - std[5279335577dd56df]::panicking::default_hook
   5:        0x10cf2ea30 - std[5279335577dd56df]::panicking::update_hook::<alloc[5d3371cc0d569cc0]::boxed::Box<rustc_driver_impl[e895074a6881ad0]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10f058540 - std[5279335577dd56df]::panicking::panic_with_hook
   7:        0x10f03ccb0 - std[5279335577dd56df]::panicking::panic_handler::{closure#0}
   8:        0x10f0319f0 - std[5279335577dd56df]::sys::backtrace::__rust_end_short_backtrace::<std[5279335577dd56df]::panicking::panic_handler::{closure#0}, !>
   9:        0x10f03e2c4 - __rustc[c625ac833ac53d73]::rust_begin_unwind
  10:        0x111db1814 - core[7db2d337c090825e]::panicking::panic_fmt
  11:        0x111db157c - core[7db2d337c090825e]::result::unwrap_failed
  12:        0x10e1d7f9c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::recover_missing_kw_before_item
  13:        0x10e1c8598 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  14:        0x10e1c8548 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  15:        0x10e1cb960 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_common
  16:        0x10e1c260c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_
  17:        0x10e1c246c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item
  18:        0x100606ea8 - rustfmt_nightly[b90a53db050a1ba0]::parse::macros::parse_macro_arg
  19:        0x1005f2eb8 - rustfmt_nightly[b90a53db050a1ba0]::macros::rewrite_macro
  20:        0x1005d79ec - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  21:        0x1005df404 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  22:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  23:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  24:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  25:        0x1005de448 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_block_with_visitor
  26:        0x1005d85a0 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  27:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  28:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  29:        0x100600780 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  30:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  31:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  32:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  33:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  34:        0x100600654 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  35:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  36:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  37:        0x10055c59c - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_expr::<rustc_ast[953edcf441bbf503]::ast::Expr>
  38:        0x10055e0cc - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_with::<alloc[5d3371cc0d569cc0]::string::String, rustc_ast[953edcf441bbf503]::ast::Expr>
  39:        0x100608868 - <rustc_ast[953edcf441bbf503]::ast::Local as rustfmt_nightly[b90a53db050a1ba0]::rewrite::Rewrite>::rewrite_result
  40:        0x1005df4c4 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  41:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  42:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  43:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  44:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  45:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  46:        0x10059bae4 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_fn
  47:        0x100596c4c - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_item
  48:        0x1005cdbd8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_items_with_reordering
  49:        0x10059a868 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_mod_items
  50:        0x10052a7dc - <scoped_tls[f6338255df284e9c]::ScopedKey<rustc_span[a3b7f6d94349d76e]::SessionGlobals>>::with::<<rustfmt_nightly[b90a53db050a1ba0]::Session<std[5279335577dd56df]::io::stdio::Stdout
>>::format_input_inner::{closure#0}, core[7db2d337c090825e]::result::Result<rustfmt_nightly[b90a53db050a1ba0]::FormatReport, rustfmt_nightly[b90a53db050a1ba0]::ErrorKind>>
  51:        0x100526bd0 - rustfmt[49b236f867ef773a]::format_and_emit_report::<std[5279335577dd56df]::io::stdio::Stdout>
  52:        0x1005377bc - rustfmt[49b236f867ef773a]::execute
  53:        0x1005346a4 - rustfmt[49b236f867ef773a]::main
  54:        0x1005330ec - std[5279335577dd56df]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  55:        0x100533638 - std[5279335577dd56df]::rt::lang_start::<()>::{closure#0}
  56:        0x10f056bb0 - std[5279335577dd56df]::rt::lang_start_internal
  57:        0x100540c30 - _main

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

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

note: please attach the file at `/Users/alestsurko/Desktop/subtensor/rustc-ice-2025-12-16T12_12_40-9714.txt` to your bug report

query stack during panic:
end of query stack

thread 'main' (45388) panicked at compiler/rustc_parse/src/parser/item.rs:401:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_keyword_str", None), NoStyle)], code: None, lint_id: None, span: Mult
iSpan { primary_spans: [Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }], span_labels: [(Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }, Translated("expected identifier, found keywor
d"))] }, children: [], suggestions: Enabled([]), args: {"token": Str("Self")}, reserved_args: {}, sort_span: Span { lo: BytePos(251162), hi: BytePos(251166), ctxt: #0 }, is_lint: None, long_ty_path: None, em
itted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 376, col: 34 } })
stack backtrace:
   0:        0x10f0655f4 - <<std[5279335577dd56df]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[7db2d337c090825e]::fmt::Display>::fmt
   1:        0x10c391e64 - core[7db2d337c090825e]::fmt::write
   2:        0x10f07c34c - <std[5279335577dd56df]::sys::stdio::unix::Stderr as std[5279335577dd56df]::io::Write>::write_fmt
   3:        0x10f03cc08 - std[5279335577dd56df]::panicking::default_hook::{closure#0}
   4:        0x10f0581dc - std[5279335577dd56df]::panicking::default_hook
   5:        0x10cf2ea30 - std[5279335577dd56df]::panicking::update_hook::<alloc[5d3371cc0d569cc0]::boxed::Box<rustc_driver_impl[e895074a6881ad0]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10f058540 - std[5279335577dd56df]::panicking::panic_with_hook
   7:        0x10f03ccb0 - std[5279335577dd56df]::panicking::panic_handler::{closure#0}
   8:        0x10f0319f0 - std[5279335577dd56df]::sys::backtrace::__rust_end_short_backtrace::<std[5279335577dd56df]::panicking::panic_handler::{closure#0}, !>
   9:        0x10f03e2c4 - __rustc[c625ac833ac53d73]::rust_begin_unwind
  10:        0x111db1814 - core[7db2d337c090825e]::panicking::panic_fmt
  11:        0x111db157c - core[7db2d337c090825e]::result::unwrap_failed
  12:        0x10e1d7f9c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::recover_missing_kw_before_item
  13:        0x10e1c8598 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  14:        0x10e1c8548 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_kind
  15:        0x10e1cb960 - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_common
  16:        0x10e1c260c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item_
  17:        0x10e1c246c - <rustc_parse[528dc25e9820ae84]::parser::Parser>::parse_item
  18:        0x100606ea8 - rustfmt_nightly[b90a53db050a1ba0]::parse::macros::parse_macro_arg
  19:        0x1005f2eb8 - rustfmt_nightly[b90a53db050a1ba0]::macros::rewrite_macro
  20:        0x1005d79ec - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  21:        0x1005df404 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  22:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  23:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  24:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  25:        0x1005de448 - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_block_with_visitor
  26:        0x1005d85a0 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  27:        0x10060110c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  28:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  29:        0x100600780 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  30:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  31:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  32:        0x10060119c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_body
  33:        0x1006257ec - <rustfmt_nightly[b90a53db050a1ba0]::lists::ListItems<core[7db2d337c090825e]::iter::adapters::map::Map<core[7db2d337c090825e]::iter::adapters::zip::Zip<core[7db2d337c090825e]::iter:
:adapters::zip::Zip<core[7db2d337c090825e]::slice::iter::Iter<rustc_ast[953edcf441bbf503]::ast::Arm>, core[7db2d337c090825e]::iter::adapters::chain::Chain<core[7db2d337c090825e]::iter::adapters::take::Take<c
ore[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>, core[7db2d337c090825e]::iter::sources::repeat::Repeat<bool>>>, alloc[5d3371cc0d569cc0]::vec::into_iter::IntoIter<core[7db2d337c090825e]::option::O
ption<rustc_span[a3b7f6d94349d76e]::BytePos>>>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#0}>, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#1}, rust
fmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#2}, rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms::{closure#3}> as core[7db2d337c090825e]::iter::traits::iterator::Iterat
or>::next
  34:        0x100600654 - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match_arms
  35:        0x1005ff87c - rustfmt_nightly[b90a53db050a1ba0]::matches::rewrite_match
  36:        0x1005d79c8 - rustfmt_nightly[b90a53db050a1ba0]::expr::format_expr
  37:        0x10055c59c - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_expr::<rustc_ast[953edcf441bbf503]::ast::Expr>
  38:        0x10055e0cc - rustfmt_nightly[b90a53db050a1ba0]::expr::rewrite_assign_rhs_with::<alloc[5d3371cc0d569cc0]::string::String, rustc_ast[953edcf441bbf503]::ast::Expr>
  39:        0x100608868 - <rustc_ast[953edcf441bbf503]::ast::Local as rustfmt_nightly[b90a53db050a1ba0]::rewrite::Rewrite>::rewrite_result
  40:        0x1005df4c4 - rustfmt_nightly[b90a53db050a1ba0]::stmt::format_stmt
  41:        0x1005978c8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  42:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  43:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  44:        0x100597d50 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_stmts
  45:        0x100599fdc - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_block
  46:        0x10059bae4 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_fn
  47:        0x100596c4c - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_item
  48:        0x1005cdbd8 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::visit_items_with_reordering
  49:        0x10059a868 - <rustfmt_nightly[b90a53db050a1ba0]::visitor::FmtVisitor>::walk_mod_items
  50:        0x10052a7dc - <scoped_tls[f6338255df284e9c]::ScopedKey<rustc_span[a3b7f6d94349d76e]::SessionGlobals>>::with::<<rustfmt_nightly[b90a53db050a1ba0]::Session<std[5279335577dd56df]::io::stdio::Stdout
>>::format_input_inner::{closure#0}, core[7db2d337c090825e]::result::Result<rustfmt_nightly[b90a53db050a1ba0]::FormatReport, rustfmt_nightly[b90a53db050a1ba0]::ErrorKind>>
  51:        0x100526bd0 - rustfmt[49b236f867ef773a]::format_and_emit_report::<std[5279335577dd56df]::io::stdio::Stdout>
  52:        0x1005377bc - rustfmt[49b236f867ef773a]::execute
  53:        0x1005346a4 - rustfmt[49b236f867ef773a]::main
  54:        0x1005330ec - std[5279335577dd56df]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  55:        0x100533638 - std[5279335577dd56df]::rt::lang_start::<()>::{closure#0}
  56:        0x10f056bb0 - std[5279335577dd56df]::rt::lang_start_internal
  57:        0x100540c30 - _main

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

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

note: please attach the file at `/Users/alestsurko/Desktop/subtensor/rustc-ice-2025-12-16T12_12_40-9714.txt` to your bug report

query stack during panic:
end of query stack

[ytmimi]

@ales-otf please provide a code snippet that can be used to reproduce your issue. The backtrace doesn't help us verify what's going on. Also, I think it would be best to open an issue in https://github.com/rust-lang/rust. This seems to be an issue in the rustc parser.

[jieyouxu]

This is another instance of upstream ICE rust-lang/rust#149692, nothing to do for rustfmt side.

EDIT: not quite, like #6739, this probably doesn't directly panic if you run it with rustc, but somehow rustfmt might be indirectly hitting the ICE. Likewise, I'd be interested in a MCVE that requires rustfmt and not just rustc to ICE.

[ales-otf]

@ales-otf please provide a code snippet that can be used to reproduce your issue. The backtrace doesn't help us verify what's going on. Also, I think it would be best to open an issue in https://github.com/rust-lang/rust. This seems to be an issue in the rustc parser.

it's hard to tell which part is exactly the trigger. you can try it on feat/rate-limit-pallet in our repo.

[0xferrous]

Maybe #6754 is related