ICE when compiling regex 1.10.6 on latest nightly

[lopopolo]

Code

regex crate

Meta

rustc --version --verbose:

rustc 1.86.0-nightly (8361aef0d 2025-01-14)
binary: rustc
commit-hash: 8361aef0d7c29b1501a316a208ed84cd8a2ae5da
commit-date: 2025-01-14
host: x86_64-unknown-linux-gnu
release: 1.86.0-nightly
LLVM version: 19.1.6

Error output

thread 'rustc' panicked at /rustc/8361aef0d7c29b1501a316a208ed84cd8a2ae5da/compiler/rustc_type_ir/src/binder.rs:806:9:
const parameter `'a/#0` ('a/#0/0) out of range when instantiating args=[]
stack backtrace:
   0: rust_begin_unwind
   1: core::panicking::panic_fmt
   2: <rustc_type_ir::binder::ArgFolder<rustc_middle::ty::context::TyCtxt>>::region_param_out_of_range
   3: <rustc_middle::ty::generics::GenericPredicates>::instantiate_into
   4: rustc_trait_selection::traits::instantiate_and_check_impossible_predicates
      [... omitted 2 frames ...]
   5: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefaultCache<(rustc_span::def_id::DefId, &rustc_middle::ty::list::RawList<(), rustc_middle::ty::generic_args::GenericArg>), rustc_middle::query::erase::Erased<[u8; 1]>>>
   6: rustc_monomorphize::partitioning::collect_and_partition_mono_items
      [... omitted 2 frames ...]
   7: rustc_codegen_ssa::back::symbol_export::exported_symbols_provider_local
      [... omitted 2 frames ...]
   8: <rustc_metadata::rmeta::encoder::EncodeContext>::encode_crate_root
   9: rustc_metadata::rmeta::encoder::encode_metadata
  10: rustc_metadata::fs::encode_and_write_metadata
  11: <rustc_interface::queries::Linker>::codegen_and_build_linker
  12: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  13: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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

note: we would appreciate a bug report: https://github.com./rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

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

note: please attach the file at `/home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/regex-1.10.6/rustc-ice-2025-01-15T12_03_23-3487.txt` to your bug report

note: compiler flags: --crate-type lib -C opt-level=3 -C embed-bitcode=no -C debuginfo=2 -C passes=sancov-module -C llvm-args=-sanitizer-coverage-level=4 -C llvm-args=-sanitizer-coverage-inline-8bit-counters -C llvm-args=-sanitizer-coverage-pc-table -C llvm-args=-sanitizer-coverage-trace-compares -C link-dead-code -Z sanitizer=address -C llvm-args=-sanitizer-coverage-stack-depth -C debug-assertions -C codegen-units=1

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

query stack during panic:
#0 [instantiate_and_check_impossible_predicates] checking impossible instantiated predicates: `regex::bytes::<impl at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/regex-1.10.6/src/regex/bytes.rs:1910:1: 1910:43>::fmt::CapturesDebugMap`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
#2 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
error: could not compile `regex` (lib)

Caused by:
  process didn't exit successfully: `/home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/rustc --crate-name regex --edition=2021 /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/regex-1.10.6/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="perf"' --cfg 'feature="perf-backtrack"' --cfg 'feature="perf-cache"' --cfg 'feature="perf-dfa"' --cfg 'feature="perf-inline"' --cfg 'feature="perf-literal"' --cfg 'feature="perf-onepass"' --cfg 'feature="std"' --cfg 'feature="unicode"' --cfg 'feature="unicode-age"' --cfg 'feature="unicode-bool"' --cfg 'feature="unicode-case"' --cfg 'feature="unicode-gencat"' --cfg 'feature="unicode-perl"' --cfg 'feature="unicode-script"' --cfg 'feature="unicode-segment"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("default", "logging", "pattern", "perf", "perf-backtrack", "perf-cache", "perf-dfa", "perf-dfa-full", "perf-inline", "perf-literal", "perf-onepass", "std", "unicode", "unicode-age", "unicode-bool", "unicode-case", "unicode-gencat", "unicode-perl", "unicode-script", "unicode-segment", "unstable", "use_std"))' -C metadata=47fb8065ddb60af2 -C extra-filename=-23b8850dd094f75a --out-dir /home/runner/work/artichoke/artichoke/fuzz/target/x86_64-unknown-linux-gnu/release/deps --target x86_64-unknown-linux-gnu -L dependency=/home/runner/work/artichoke/artichoke/fuzz/target/x86_64-unknown-linux-gnu/release/deps -L dependency=/home/runner/work/artichoke/artichoke/fuzz/target/release/deps --extern aho_corasick=/home/runner/work/artichoke/artichoke/fuzz/target/x86_64-unknown-linux-gnu/release/deps/libaho_corasick-a3643a814fb8b39e.rmeta --extern memchr=/home/runner/work/artichoke/artichoke/fuzz/target/x86_64-unknown-linux-gnu/release/deps/libmemchr-aea230271f267d06.rmeta --extern regex_automata=/home/runner/work/artichoke/artichoke/fuzz/target/x86_64-unknown-linux-gnu/release/deps/libregex_automata-6ec2d483a35ccd5f.rmeta --extern regex_syntax=/home/runner/work/artichoke/artichoke/fuzz/target/x86_64-unknown-linux-gnu/release/deps/libregex_syntax-290920509c6ee32b.rmeta --cap-lints allow -Cpasses=sancov-module -Cllvm-args=-sanitizer-coverage-level=4 -Cllvm-args=-sanitizer-coverage-inline-8bit-counters -Cllvm-args=-sanitizer-coverage-pc-table -Cllvm-args=-sanitizer-coverage-trace-compares --cfg fuzzing -Clink-dead-code -Zsanitizer=address -Cllvm-args=-sanitizer-coverage-stack-depth -Cdebug-assertions -C codegen-units=1` (exit status: 101)
warning: build failed, waiting for other jobs to finish...
Error: failed to build fuzz script: ASAN_OPTIONS="detect_odr_violation=0" RUSTFLAGS="-Cpasses=sancov-module -Cllvm-args=-sanitizer-coverage-level=4 -Cllvm-args=-sanitizer-coverage-inline-8bit-counters -Cllvm-args=-sanitizer-coverage-pc-table -Cllvm-args=-sanitizer-coverage-trace-compares --cfg fuzzing -Clink-dead-code -Zsanitizer=address -Cllvm-args=-sanitizer-coverage-stack-depth -Cdebug-assertions -C codegen-units=1" "cargo" "build" "--manifest-path" "/home/runner/work/artichoke/artichoke/fuzz/Cargo.toml" "--target" "x86_64-unknown-linux-gnu" "--release" "--config" "profile.release.debug=true" "--bins"

Stack backtrace:
   0: anyhow::error::<impl anyhow::Error>::msg
   1: cargo_fuzz::project::FuzzProject::exec_build
   2: <cargo_fuzz::options::build::Build as cargo_fuzz::RunCommand>::run_command
   3: cargo_fuzz::main
   4: std::sys::backtrace::__rust_begin_short_backtrace
   5: std::rt::lang_start::{{closure}}
   6: std::rt::lang_start_internal
   7: main
   8: <unknown>
   9: __libc_start_main
  10: _start

Backtrace

<backtrace>

(Opening again since I accidentally closed #135564 and can't reopen it)

[cyrgani]

Probably a duplicate of #135515, which is fixed in the latest nightly.

[lqd]

Thanks for opening an issue!

PR #135520 has already fixed this problem, and is available in today's nightly, so we can close this. Feel free to reopen if it happens again.