Allow compilation recovery after emitting lint attr parsing error

[Bryntet]

Fixes #154800 and adds regression test

[rustbot]

These commits modify the Cargo.lock file. Unintentional changes to Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

[rustbot]

r? @JohnTitor

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[Bryntet]

adding the dependency from rustc_lint to rustc_parse shouldn't affect anything since rustc_parse is already a dep of rustc_attr_parsing

[rust-log-analyzer]

The job pr-check-2 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

failed to process buffered lint here (dummy = true)
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: rustc_lint::early::check_ast_node::<rustc_lint::BuiltinCombinedEarlyLintPass, (&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute])>
   3: rustc_interface::passes::early_lint_checks
      [... omitted 1 frame ...]
   4: rustc_ast_lowering::lower_to_hir
      [... omitted 1 frame ...]
   5: rustc_middle::hir::map::hir_crate_items
      [... omitted 1 frame ...]
   6: rustc_passes::hir_id_validator::check_crate
   7: rustc_interface::passes::analysis
      [... omitted 1 frame ...]
   8: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<<rustc_middle::ty::context::GlobalCtxt>::enter<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}, core::option::Option<rustc_interface::queries::Linker>>::{closure#1}, core::option::Option<rustc_interface::queries::Linker>>::{closure#0}, core::option::Option<rustc_interface::queries::Linker>>
   9: <rustc_middle::ty::context::TyCtxt>::create_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, 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}>
  10: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>
  11: rustc_span::create_session_globals_then::<(), rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}::{closure#0}>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: the compiler unexpectedly panicked. This is a bug
---
note: please attach the file at `/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.87/rustc-ice-2026-04-07T18_35_36-29751.txt` to your bug report

note: rustc 1.96.0-nightly (67f0068e6 2026-04-07) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C embed-bitcode=no -Z binary-dep-depinfo -Z on-broken-pipe=kill -Z allow-features=binary-dep-depinfo,proc_macro_span,proc_macro_span_shrink,proc_macro_diagnostic

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

query stack during panic:
#0 [early_lint_checks] perform lints prior to AST lowering
#1 [hir_crate] getting the crate HIR
#2 [hir_crate_items] getting HIR crate items
#3 [analysis] running analysis passes on crate `syn`
end of query stack
[RUSTC-TIMING] syn test:false 0.518
error: could not compile `syn` (lib)

Caused by:
  process didn't exit successfully: `/checkout/obj/build/bootstrap/debug/rustc /checkout/obj/build/bootstrap/debug/rustc --crate-name syn --edition=2021 /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.87/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("clone-impls", "default", "derive", "extra-traits", "fold", "full", "parsing", "printing", "proc-macro", "test", "visit", "visit-mut"))' -C metadata=c2c5a4152451e9fe -C extra-filename=-c321b268773f077a --out-dir /checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/release/deps -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/release/deps --extern proc_macro2=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/release/deps/libproc_macro2-e84b3afd97ba1e0d.rmeta --extern quote=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/release/deps/libquote-14d2c5c577271fc0.rmeta --extern unicode_ident=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/release/deps/libunicode_ident-625858bb9072c24d.rmeta --cap-lints allow -Z binary-dep-depinfo` (exit status: 101)
warning: build failed, waiting for other jobs to finish...
[RUSTC-TIMING] generic_array test:false 1.087
[RUSTC-TIMING] aho_corasick test:false 2.421
[RUSTC-TIMING] regex_syntax test:false 2.157
Bootstrap failed while executing `clippy ci --stage 2`

[JohnTitor]

@rustbot reroll

[rust-bors]

☔ The latest upstream changes (presumably #155056) made this pull request unmergeable. Please resolve the merge conflicts.

[JonathanBrouwer]

This PR should be integrated in the new attribute lint port attempt, rather than being a separate PR