clippy: rustc panicked at hir.rs:1165, can't get the span of an arbitrary parsed attribute

[proski]

Summary

The crash only happens with clippy. The build, test and fmt targets are not affected.

The issue happens in a proprietary crate that I cannot share. I cannot promise to provide a minimal example. I'll take a look.

Version

$ rustc +nightly -vV
rustc 1.87.0-nightly (85abb2763 2025-02-25)
binary: rustc
commit-hash: 85abb276361c424d64743c0965242dd0e7b866d1
commit-date: 2025-02-25
host: x86_64-unknown-linux-gnu
release: 1.87.0-nightly
LLVM version: 20.1.0

Error output

Backtrace

$ RUST_BACKTRACE=1 cargo +nightly clippy
  Checking telemetry-encoder v0.1.0 (/home/proskin/src/telemetry-encoder)

thread 'rustc' panicked at /rustc/85abb276361c424d64743c0965242dd0e7b866d1/compiler/rustc_hir/src/hir.rs:1165:18:
can't get the span of an arbitrary parsed attribute: Parsed(Repr([(ReprTransparent, /home/proskin/.cargo/registry/src/artifactory.relspace.net-84375e99cd472db6/bitflags-2.8.0/src/internal.rs:19:16: 19:27 (#216))]))
stack backtrace:
 0: rust_begin_unwind
 1: core::panicking::panic_fmt
 2: <clippy_lints::macro_use::MacroUseImports as rustc_lint::passes::LateLintPass>::check_attribute
 3: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
 4: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_block
 5: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_expr::{closure#0}::{closure#0}
 6: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_expr
 7: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_body
 8: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
 9: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
10: rustc_lint::late::check_crate::{closure#0}
11: rustc_lint::late::check_crate
12: rustc_interface::passes::analysis
    [... omitted 1 frame ...]
13: 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}
14: 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-clippy/issues/new?template=ice.yml

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

note: please attach the file at `/home/proskin/src/telemetry-encoder/rustc-ice-2025-02-26T23_14_30-16829.txt` to your bug report

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 [analysis] running analysis passes on this crate
end of query stack
note: Clippy version: clippy 0.1.86 (85abb27636 2025-02-25)

error: could not compile `telemetry-encoder` (bin "telemetry-encoder")

Caused by:
process didn't exit successfully: `/home/proskin/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/clippy-driver /home/proskin/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/rustc --crate-name telemetry_encoder --edition=2021 src/main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=313 --crate-type bin --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 '--deny=clippy::suspicious' '--deny=clippy::style' '--deny=clippy::perf' '--deny=clippy::pedantic' '--deny=clippy::correctness' '--deny=clippy::complexity' '--deny=clippy::cargo' '--deny=clippy::all' '--allow=clippy::multiple_crate_versions' '--deny=clippy::missing_docs_in_private_items' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=9ce66c15df96ff0d -C extra-filename=-be111676247cc676 --out-dir /home/proskin/src/telemetry-encoder/target/debug/deps -C incremental=/home/proskin/src/telemetry-encoder/target/debug/incremental -L dependency=/home/proskin/src/telemetry-encoder/target/debug/deps --extern bitflags=/home/proskin/src/telemetry-encoder/target/debug/deps/libbitflags-733f557f618b1cd4.rmeta --extern cai_golay=/home/proskin/src/telemetry-encoder/target/debug/deps/libcai_golay-b8882adde89e51e9.rmeta --extern clap=/home/proskin/src/telemetry-encoder/target/debug/deps/libclap-a3c72b3304a60018.rmeta --extern crossbeam_channel=/home/proskin/src/telemetry-encoder/target/debug/deps/libcrossbeam_channel-f98f2242efe5e83d.rmeta --extern flatbuffers=/home/proskin/src/telemetry-encoder/target/debug/deps/libflatbuffers-d96c12a6fe5ac50a.rmeta --extern rs_network_interface=/home/proskin/src/telemetry-encoder/target/debug/deps/librs_network_interface-189b4f49348cbc88.rmeta --extern serde=/home/proskin/src/telemetry-encoder/target/debug/deps/libserde-d694fe2040850058.rmeta --extern serde_json=/home/proskin/src/telemetry-encoder/target/debug/deps/libserde_json-cabd6208b70e811b.rmeta --extern socket2=/home/proskin/src/telemetry-encoder/target/debug/deps/libsocket2-56dae2d294931035.rmeta --extern thiserror=/home/proskin/src/telemetry-encoder/target/debug/deps/libthiserror-1fbc8606ddaa7b86.rmeta --extern tokio=/home/proskin/src/telemetry-encoder/target/debug/deps/libtokio-f64b21f6c7b6e281.rmeta --extern tracing=/home/proskin/src/telemetry-encoder/target/debug/deps/libtracing-f035d4a807c12b0f.rmeta --extern tracing_subscriber=/home/proskin/src/telemetry-encoder/target/debug/deps/libtracing_subscriber-ae6e1214c51111d0.rmeta --extern typify=/home/proskin/src/telemetry-encoder/target/debug/deps/libtypify-d258e32ffd7ba59e.rmeta` (exit status: 101)

[proski]

I was able to reduce the issue to a simple example.

Cargo.toml:

[package]
name = "issue-demo"
version = "0.1.0"
edition = "2024"

[lints.clippy]
pedantic.level = "deny"

[dependencies]
bitflags = { version = "=2.8.0" }

src/lib.rs:

bitflags::bitflags! {
    struct Bits: u32 {
    }
}

[y21]

#[repr(transparent)] struct Foo; is enough to trigger this. See the pinned issue #14303 (and rust-lang/rust#137640 which the pinned issue is also a duplicate of).