ICE: `unrecognized representation hint`

[matthiaskrgr]

snippet:

#[repr(Rust(16))]
fn main() {}

Version information

rustc 1.76.0-nightly (3bb017199 2023-11-26)
binary: rustc
commit-hash: 3bb0171999a65b0650d9405a7b2e8e7dc3476dec
commit-date: 2023-11-26
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.5

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: unrecognized representation hint
 --> /tmp/icemaker_global_tempdir.JyumvzAaUw4r/rustc_testrunner_tmpdir_reporting.9MA7E5rCByd0/mvce.rs:1:8
  |
1 | #[repr(Rust(16))]
  |        ^^^^^^^^
  |
note: delayed at compiler/rustc_attr/src/builtin.rs:1065:32
         0: <rustc_errors::HandlerInner>::emit_diagnostic
         1: rustc_attr::builtin::parse_repr_attr
         2: <rustc_lint::BuiltinCombinedEarlyLintPass as rustc_lint::passes::EarlyLintPass>::check_item
         3: <rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_item
         4: rustc_interface::passes::early_lint_checks
         5: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::early_lint_checks::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>
         6: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         7: rustc_query_impl::query_impl::early_lint_checks::get_query_non_incr::__rust_end_short_backtrace
         8: rustc_ast_lowering::lower_to_hir
         9: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::hir_crate::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
        10: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        11: rustc_query_impl::query_impl::hir_crate::get_query_non_incr::__rust_end_short_backtrace
        12: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::hir_attrs::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
        13: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_hir::hir_id::OwnerId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        14: rustc_query_impl::query_impl::hir_attrs::get_query_non_incr::__rust_end_short_backtrace
        15: <rustc_middle::hir::map::Map>::attrs
        16: rustc_passes::entry::entry_fn
        17: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::entry_fn::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 12]>>
        18: <rustc_query_impl::query_impl::entry_fn::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
        19: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 12]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        20: rustc_query_impl::query_impl::entry_fn::get_query_non_incr::__rust_end_short_backtrace
        21: rustc_interface::passes::analysis
        22: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        23: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        24: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        25: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
        26: std::sys_common::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<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        27: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        28: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/3bb0171999a65b0650d9405a7b2e8e7dc3476dec/library/alloc/src/boxed.rs:2007:9
        29: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/3bb0171999a65b0650d9405a7b2e8e7dc3476dec/library/alloc/src/boxed.rs:2007:9
        30: std::sys::unix::thread::Thread::new::thread_start
                   at /rustc/3bb0171999a65b0650d9405a7b2e8e7dc3476dec/library/std/src/sys/unix/thread.rs:108:17
        31: <unknown>
        32: <unknown>
 --> /tmp/icemaker_global_tempdir.JyumvzAaUw4r/rustc_testrunner_tmpdir_reporting.9MA7E5rCByd0/mvce.rs:1:8
  |
1 | #[repr(Rust(16))]
  |        ^^^^^^^^

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: rustc 1.76.0-nightly (3bb017199 2023-11-26) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
error: aborting due to 2 previous errors

[matthiaskrgr]

Regression in nightly-2023-08-26

#114201