ICE: `parse_expected_identifier_found_str`

[matthiaskrgr]

auto-reduced (treereduce-rust):

         
const!(&raw mut a);           





g

original:

macro_rules! is_expr {
    ($e:expr) => {}
}

assert!(c_p == i_r);         //~ ERROR raw address of syntax is experimental
const!(&raw mut a);           //~ ERROR raw address of syntax is experimental

#[cfg(FALSE)]
fn cfgd_out() {
    let mut a = 0;
    &raw mut FOUR const a;               //~ ERROR raw address of syntax is experimental
    &raw mut a;                 //@ check-pass
}

fn main() {
    let mut ref_const = 123;
    let type_ascription = &raw const y;       //~ ERROR raw address of syntax is experimental
    let x = &raw mut y;         //~ ERROR raw address of syntax is experimental
}
g

Version information

rustc 1.81.0-nightly (8c39ac9ec 2024-07-11)
binary: rustc
commit-hash: 8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43
commit-date: 2024-07-11
host: x86_64-unknown-linux-gnu
release: 1.81.0-nightly
LLVM version: 18.1.7

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

Program output

thread 'rustc' panicked at compiler/rustc_parse/src/parser/item.rs:400:32:
called `Result::unwrap()` on an `Err` value: Some(DiagInner { level: Error, messages: [(FluentIdentifier("parse_expected_identifier_found_str", None), NoStyle)], code: None, span: MultiSpan { primary_spans: [/tmp/icemaker_global_tempdir.v8vwIM7cQWLj/rustc_testrunner_tmpdir_reporting.S34MI5P1DYcO/mvce.rs:4:6: 4:7 (#0)], span_labels: [(/tmp/icemaker_global_tempdir.v8vwIM7cQWLj/rustc_testrunner_tmpdir_reporting.S34MI5P1DYcO/mvce.rs:4:6: 4:7 (#0), FluentIdentifier("parse_expected_identifier", None))] }, children: [], suggestions: Ok([]), args: {"token": Str("!")}, sort_span: /tmp/icemaker_global_tempdir.v8vwIM7cQWLj/rustc_testrunner_tmpdir_reporting.S34MI5P1DYcO/mvce.rs:4:6: 4:7 (#0), is_lint: None, emitted_at: DiagLocation { file: "compiler/rustc_parse/src/parser/diagnostics.rs", line: 336, col: 34 } })
stack backtrace:
   0:     0x79e0b866d655 - std::backtrace_rs::backtrace::libunwind::trace::h0ad7104fc0c7e307
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x79e0b866d655 - std::backtrace_rs::backtrace::trace_unsynchronized::h9c7f2883cf9d711f
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x79e0b866d655 - std::sys::backtrace::_print_fmt::hc21801433e5e75bd
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/sys/backtrace.rs:68:5
   3:     0x79e0b866d655 - <std::sys::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h01536dc20a0b3dc8
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/sys/backtrace.rs:44:22
   4:     0x79e0b86bcd3b - core::fmt::rt::Argument::fmt::h7fa63291ffc0421e
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/core/src/fmt/rt.rs:173:76
   5:     0x79e0b86bcd3b - core::fmt::write::haaca9a516bbb3d6d
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/core/src/fmt/mod.rs:1182:21
   6:     0x79e0b866203f - std::io::Write::write_fmt::hb7bdd50ff15c6341
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/io/mod.rs:1835:15
   7:     0x79e0b866d42e - std::sys::backtrace::_print::h0e69b6ad9c8445db
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/sys/backtrace.rs:47:5
   8:     0x79e0b866d42e - std::sys::backtrace::print::h416361b81303f7a9
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/sys/backtrace.rs:34:9
   9:     0x79e0b866fd79 - std::panicking::default_hook::{{closure}}::h98a2ed3a8cdc4a0e
  10:     0x79e0b866fb1c - std::panicking::default_hook::h87426540abda5fa6
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/panicking.rs:292:9
  11:     0x79e0b4a214c9 - std[345a6075b69746bb]::panicking::update_hook::<alloc[49e2c6433099fa6f]::boxed::Box<rustc_driver_impl[38b2d71697c3137b]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x79e0b867069f - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0b1e506e70b4a6ea
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/alloc/src/boxed.rs:2078:9
  13:     0x79e0b867069f - std::panicking::rust_panic_with_hook::hbfcf7e706fc9ce1f
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/panicking.rs:804:13
  14:     0x79e0b86702c7 - std::panicking::begin_panic_handler::{{closure}}::h106fd1ad345395eb
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/panicking.rs:670:13
  15:     0x79e0b866db19 - std::sys::backtrace::__rust_end_short_backtrace::hd1df58f8f74bde30
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/sys/backtrace.rs:171:18
  16:     0x79e0b866ff54 - rust_begin_unwind
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/panicking.rs:661:5
  17:     0x79e0b86b92f3 - core::panicking::panic_fmt::h7402a80f725a0b7f
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/core/src/panicking.rs:74:14
  18:     0x79e0b86b9946 - core::result::unwrap_failed::h381a87aa4c123d1d
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/core/src/result.rs:1679:5
  19:     0x79e0b696d67f - <rustc_parse[352ee8005d917dd6]::parser::Parser>::recover_missing_kw_before_item
  20:     0x79e0b697114e - <rustc_parse[352ee8005d917dd6]::parser::Parser>::parse_item_kind
  21:     0x79e0b6962b76 - <rustc_parse[352ee8005d917dd6]::parser::Parser>::parse_item_common
  22:     0x79e0b695ff56 - <rustc_parse[352ee8005d917dd6]::parser::Parser>::parse_item_
  23:     0x79e0b695f62c - <rustc_parse[352ee8005d917dd6]::parser::Parser>::parse_mod
  24:     0x79e0b6e7c9e7 - <rustc_interface[dd56aaed4815c9c3]::queries::Queries>::parse
  25:     0x79e0b6de7646 - rustc_interface[dd56aaed4815c9c3]::interface::run_compiler::<core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>, rustc_driver_impl[38b2d71697c3137b]::run_compiler::{closure#0}>::{closure#1}
  26:     0x79e0b6d9b0c9 - std[345a6075b69746bb]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[dd56aaed4815c9c3]::util::run_in_thread_with_globals<rustc_interface[dd56aaed4815c9c3]::util::run_in_thread_pool_with_globals<rustc_interface[dd56aaed4815c9c3]::interface::run_compiler<core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>, rustc_driver_impl[38b2d71697c3137b]::run_compiler::{closure#0}>::{closure#1}, core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>>::{closure#0}, core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>>
  27:     0x79e0b6d9ae7a - <<std[345a6075b69746bb]::thread::Builder>::spawn_unchecked_<rustc_interface[dd56aaed4815c9c3]::util::run_in_thread_with_globals<rustc_interface[dd56aaed4815c9c3]::util::run_in_thread_pool_with_globals<rustc_interface[dd56aaed4815c9c3]::interface::run_compiler<core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>, rustc_driver_impl[38b2d71697c3137b]::run_compiler::{closure#0}>::{closure#1}, core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>>::{closure#0}, core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[52b6a911b4720599]::result::Result<(), rustc_span[35866dc41a87639c]::ErrorGuaranteed>>::{closure#2} as core[52b6a911b4720599]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  28:     0x79e0b867a4fb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he4016fa7a4767d81
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/alloc/src/boxed.rs:2064:9
  29:     0x79e0b867a4fb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h530d2f5d97b41cf7
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/alloc/src/boxed.rs:2064:9
  30:     0x79e0b867a4fb - std::sys::pal::unix::thread::Thread::new::thread_start::h5aa83f9ec739fa87
                               at /rustc/8c39ac9eccdfaeff11bd3b6107817a81fe0a3a43/library/std/src/sys/pal/unix/thread.rs:108:17
  31:     0x79e0b840eded - <unknown>
  32:     0x79e0b84920dc - <unknown>
  33:                0x0 - <unknown>

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 make sure that you have updated to the latest nightly

note: rustc 1.81.0-nightly (8c39ac9ec 2024-07-11) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

[matthiaskrgr]

#127419 cc @trevyn