[ICE]: `#[track_caller]` requires the Rust ABI

[matthiaskrgr]

Code

#![crate_type = "lib"]
#[track_caller]
pub extern fn has_x86_interrupt_abi() {}

Meta

rustc --version --verbose:

rustc 1.96.0-nightly (fb27476aa 2026-03-28)
binary: rustc
commit-hash: fb27476aaf1012f1f6ace6306f9b990e0d989c31
commit-date: 2026-03-28
host: x86_64-unknown-linux-gnu
release: 1.96.0-nightly
LLVM version: 22.1.2

Error output

<output>

Backtrace

warning: `extern` declarations without an explicit ABI are deprecated
 --> code.rs:3:5
  |
3 | pub extern fn has_x86_interrupt_abi() {}
  |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
  |
  = note: `#[warn(missing_abi)]` on by default

warning: 1 warning emitted

note: no errors encountered even though delayed bugs were created

note: those delayed bugs will now be shown as internal compiler errors

error: internal compiler error: `#[track_caller]` requires the Rust ABI
  |
  = note: delayed at /rustc-dev/fb27476aaf1012f1f6ace6306f9b990e0d989c31/compiler/rustc_codegen_ssa/src/codegen_attrs.rs:154:31
             0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
             1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
             2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
             3: rustc_codegen_ssa::codegen_attrs::codegen_fn_attrs
             4: rustc_query_impl::query_impl::codegen_fn_attrs::invoke_provider_fn::__rust_begin_short_backtrace
             5: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::DefIdCache<rustc_middle::query::erase::ErasedData<[u8; 8]>>, false>
             6: rustc_query_impl::query_impl::codegen_fn_attrs::execute_query_non_incr::__rust_end_short_backtrace
             7: rustc_hir_analysis::check::check::check_item_type
             8: rustc_hir_analysis::check::wfcheck::check_well_formed
             9: rustc_query_impl::query_impl::check_well_formed::invoke_provider_fn::__rust_begin_short_backtrace
            10: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 1]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
            11: rustc_query_impl::query_impl::check_well_formed::execute_query_non_incr::__rust_end_short_backtrace
            12: rustc_hir_analysis::check::wfcheck::check_type_wf
            13: rustc_query_impl::query_impl::check_type_wf::invoke_provider_fn::__rust_begin_short_backtrace
            14: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 1]>>, false>
            15: rustc_query_impl::query_impl::check_type_wf::execute_query_non_incr::__rust_end_short_backtrace
            16: rustc_hir_analysis::check_crate
            17: rustc_interface::passes::analysis
            18: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
            19: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
            20: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
            21: std::sys::backtrace::__rust_begin_short_backtrace::<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}, ()>
            22: <std::thread::lifecycle::spawn_unchecked<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#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            23: <std::sys::thread::unix::Thread>::new::thread_start
            24: <unknown>
            25: <unknown>


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/matthias/vcs/github/CRED/rustc-ice-2026-03-29T09_07_12-3911110.txt` to your bug report

note: rustc 1.96.0-nightly (fb27476aa 2026-03-28) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

[matthiaskrgr]

https://github.com/rust-lang/rust/pull/153920/changes#diff-a313c94149bd8e03a482dbf15c3d1b9414ca74c4f2e35f94253649c2be1ceb5cR154