ICE

[bend-n]

Code

pub fn b() {
    #[cfg(target_feature = "cpu")]
    a
    #[cfg(not(target_feature = "cpu"))]
}

Meta

rustc --version --verbose:

rustc 1.76.0-nightly (21cce21d8 2023-12-11)
binary: rustc
commit-hash: 21cce21d8c012f14cf74d5afddd795d324600dac
commit-date: 2023-12-11
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.5

Error output

error: internal compiler error: the following error was constructed but not emitted

error: expected expression, found `}`
 --> src/lib.rs:5:1
  |
5 | }
  | ^ expected expression

thread 'rustc' panicked at compiler/rustc_errors/src/diagnostic_builder.rs:650:21:
error was constructed but not emitted
stack backtrace:
   0: rust_begin_unwind
             at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/panicking.rs:645:5
   1: core::panicking::panic_fmt
             at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/core/src/panicking.rs:72:14
   2: <rustc_errors::diagnostic_builder::DiagnosticBuilderInner as core::ops::drop::Drop>::drop
   3: core::ptr::drop_in_place::<rustc_errors::diagnostic_builder::DiagnosticBuilderInner>
   4: <rustc_parse::parser::Parser>::attr_on_non_tail_expr
   5: <rustc_parse::parser::Parser>::parse_block_tail
   6: <rustc_parse::parser::Parser>::parse_fn
   7: <rustc_parse::parser::Parser>::parse_item_kind
   8: <rustc_parse::parser::Parser>::parse_item_common
   9: <rustc_parse::parser::Parser>::parse_mod
  10: rustc_interface::passes::parse
  11: <rustc_interface::queries::Queries>::parse
  12: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{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: 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 attach the file at `/home/bendn/ice/rustc-ice-2023-12-14T07_49_36-684820.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED] -C target-cpu=native

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

query stack during panic:
end of query stack

Backtrace

thread 'rustc' panicked at compiler/rustc_errors/src/diagnostic_builder.rs:650:21:
error was constructed but not emitted
stack backtrace:
   0:     0x7f10bd3d9da1 - std::backtrace_rs::backtrace::libunwind::trace::h4f2e2566beda338b
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f10bd3d9da1 - std::backtrace_rs::backtrace::trace_unsynchronized::h6abedcf085db84db
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f10bd3d9da1 - std::backtrace::Backtrace::create::hd16c0afea63fc084
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/backtrace.rs:331:13
   3:     0x7f10bd3d9cf0 - std::backtrace::Backtrace::force_capture::h65c23895fcce40ee
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/backtrace.rs:312:9
   4:     0x7f10ba13328c - std[f551778c0f27cc6d]::panicking::update_hook::<alloc[dc008c177c6f77ab]::boxed::Box<rustc_driver_impl[6e9cf9b4eddc1f9a]::install_ice_hook::{closure#0}>>::{closure#0}
   5:     0x7f10bd3f5688 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hcd18a368e1cefb08
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/alloc/src/boxed.rs:2029:9
   6:     0x7f10bd3f5688 - std::panicking::rust_panic_with_hook::h321aae92a11b5eba
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/panicking.rs:783:13
   7:     0x7f10bd3f53a9 - std::panicking::begin_panic_handler::{{closure}}::h8ecc59ab740042e4
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/panicking.rs:649:13
   8:     0x7f10bd3f2926 - std::sys_common::backtrace::__rust_end_short_backtrace::hbc1b3ac8c89dfffa
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/sys_common/backtrace.rs:171:18
   9:     0x7f10bd3f5142 - rust_begin_unwind
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/panicking.rs:645:5
  10:     0x7f10bd441bd5 - core::panicking::panic_fmt::hb0d8a0f6fec1d8af
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/core/src/panicking.rs:72:14
  11:     0x7f10bbca62a9 - <rustc_errors[6f2fa450043bd5e]::diagnostic_builder::DiagnosticBuilderInner as core[d7d4a658e83ad6ec]::ops::drop::Drop>::drop
  12:     0x7f10bbca62d6 - core[d7d4a658e83ad6ec]::ptr::drop_in_place::<rustc_errors[6f2fa450043bd5e]::diagnostic_builder::DiagnosticBuilderInner>
  13:     0x7f10b8dde469 - <rustc_parse[4a17385e886b1063]::parser::Parser>::attr_on_non_tail_expr
  14:     0x7f10bbbfc378 - <rustc_parse[4a17385e886b1063]::parser::Parser>::parse_block_tail
  15:     0x7f10bb78edba - <rustc_parse[4a17385e886b1063]::parser::Parser>::parse_fn
  16:     0x7f10bbcb9a74 - <rustc_parse[4a17385e886b1063]::parser::Parser>::parse_item_kind
  17:     0x7f10bb7a7409 - <rustc_parse[4a17385e886b1063]::parser::Parser>::parse_item_common
  18:     0x7f10bb7a4a08 - <rustc_parse[4a17385e886b1063]::parser::Parser>::parse_mod
  19:     0x7f10bc31ef50 - rustc_interface[b13791352229774c]::passes::parse
  20:     0x7f10bc31ecdc - <rustc_interface[b13791352229774c]::queries::Queries>::parse
  21:     0x7f10bc4359d6 - rustc_interface[b13791352229774c]::interface::run_compiler::<core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>, rustc_driver_impl[6e9cf9b4eddc1f9a]::run_compiler::{closure#0}>::{closure#0}
  22:     0x7f10bc3aff4a - std[f551778c0f27cc6d]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[b13791352229774c]::util::run_in_thread_with_globals<rustc_interface[b13791352229774c]::util::run_in_thread_pool_with_globals<rustc_interface[b13791352229774c]::interface::run_compiler<core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>, rustc_driver_impl[6e9cf9b4eddc1f9a]::run_compiler::{closure#0}>::{closure#0}, core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>>::{closure#0}, core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>>
  23:     0x7f10bc3afd73 - <<std[f551778c0f27cc6d]::thread::Builder>::spawn_unchecked_<rustc_interface[b13791352229774c]::util::run_in_thread_with_globals<rustc_interface[b13791352229774c]::util::run_in_thread_pool_with_globals<rustc_interface[b13791352229774c]::interface::run_compiler<core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>, rustc_driver_impl[6e9cf9b4eddc1f9a]::run_compiler::{closure#0}>::{closure#0}, core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>>::{closure#0}, core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d7d4a658e83ad6ec]::result::Result<(), rustc_span[7dad7e8a9e9d3081]::ErrorGuaranteed>>::{closure#1} as core[d7d4a658e83ad6ec]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  24:     0x7f10bd3ff515 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb577b19a12e09868
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/alloc/src/boxed.rs:2015:9
  25:     0x7f10bd3ff515 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8a3cf55554903b8d
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/alloc/src/boxed.rs:2015:9
  26:     0x7f10bd3ff515 - std::sys::unix::thread::Thread::new::thread_start::hc928c4ba1b883694
                               at /rustc/21cce21d8c012f14cf74d5afddd795d324600dac/library/std/src/sys/unix/thread.rs:108:17
  27:     0x7f10b72aa9eb - <unknown>
  28:     0x7f10b732e7cc - <unknown>
  29:                0x0 - <unknown>


rustc version: 1.76.0-nightly (21cce21d8 2023-12-11)
platform: x86_64-unknown-linux-gnu

[matthiaskrgr]

Probably duplicate of #118575