ICE: `assertion failed: matches!(diagnostic.level, Error | Warning | Allow)`

[matthiaskrgr]

auto-reduced (treereduce-rust):

macro_rules! foo {
    ($val:ident) => {
        true;
    };
}

fn main() {
    #[expect(semicolon_in_expressions_from_macros)]
    async {
        let _ = foo!(allow_does_not_work);
    };
}

original code

original:

//@ check-pass
//@ edition:2018
#![feature(stmt_expr_attributes)]
#![warn(semicolon_in_expressions_from_macros)]

#[allow(dead_code)]
macro_rules! foo {
    ($val:ident) => {
        true; //~  WARN trailing semicolon in macro
              //~| WARN this was previously accepted
              //~| WARN trailing semicolon in macro
              //~| WARN this was previously accepted
              //~| WARN trailing semicolon in macro
              //~| WARN this was previously accepted
    }
}

#[allow(semicolon_in_expressions_from_macros)]
async fn bar() {
    foo!(first);
}

fn main() {
    #[expect(reason = "I don't know what I'm waiting for")]
    let _ = {
        foo!(clippy)
    };

    #[allow(semicolon_in_expressions_from_macros)]
    let _ = foo!(second);

    #[allow(semicolon_in_expressions_from_macros)]
    fn inner() {
        let _ = foo!(third);
    }

    #[expect(semicolon_in_expressions_from_macros)]
    async {
        let _ = foo!(allow_does_not_work);
    };

    let _ = {
        foo!(warn_in_block)
    };

    let _ = foo!(warn_in_expr);

    // This `#[allow]` does not work, since the attribute gets dropped
    // when we expand the macro
    let _ = #[allow(semicolon_in_expressions_from_macros)] foo!(allow_does_not_work);
}

Version information

rustc 1.81.0-nightly (1d1356d0f 2024-06-15)
binary: rustc
commit-hash: 1d1356d0f67131f97b4f1631a24cd10d7dbcca42
commit-date: 2024-06-15
host: x86_64-unknown-linux-gnu
release: 1.81.0-nightly
LLVM version: 18.1.7

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2021

Program output

error[E0658]: the `#[expect]` attribute is an experimental feature
 --> /tmp/icemaker_global_tempdir.qyEl7I1p3eR3/rustc_testrunner_tmpdir_reporting.ILQhyULMDD3H/mvce.rs:8:5
  |
8 |     #[expect(semicolon_in_expressions_from_macros)]
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #54503 <https://github.com/rust-lang/rust/issues/54503> for more information
  = help: add `#![feature(lint_reasons)]` to the crate attributes to enable
  = note: this compiler was built on 2024-06-15; consider upgrading it if it is out of date

thread 'rustc' panicked at compiler/rustc_errors/src/lib.rs:1432:13:
assertion failed: matches!(diagnostic.level, Error | Warning | Allow)
stack backtrace:
   0:     0x7b7a4bfdaae5 - std::backtrace_rs::backtrace::libunwind::trace::hfdf631fd03f770a2
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7b7a4bfdaae5 - std::backtrace_rs::backtrace::trace_unsynchronized::h4b66a18855df7c81
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7b7a4bfdaae5 - std::sys_common::backtrace::_print_fmt::hc68641ea5ebed78b
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7b7a4bfdaae5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0232bc3c77cf19c0
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7b7a4c02b77b - core::fmt::rt::Argument::fmt::h6f3beb687e719ad0
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/core/src/fmt/rt.rs:165:63
   5:     0x7b7a4c02b77b - core::fmt::write::h293327fa69d57c1b
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/core/src/fmt/mod.rs:1168:21
   6:     0x7b7a4bfcf6bf - std::io::Write::write_fmt::h1a63a575073e52db
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/io/mod.rs:1835:15
   7:     0x7b7a4bfda8be - std::sys_common::backtrace::_print::h72fe4c54582659e7
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7b7a4bfda8be - std::sys_common::backtrace::print::h8689f207b07afb2c
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7b7a4bfdd2f9 - std::panicking::default_hook::{{closure}}::h6db5d0a05cc91d89
  10:     0x7b7a4bfdd09c - std::panicking::default_hook::h55df27622849dfa3
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/panicking.rs:292:9
  11:     0x7b7a488c1750 - std[a95b5bdb0bb4e4d9]::panicking::update_hook::<alloc[1c670b1f13e1d787]::boxed::Box<rustc_driver_impl[b19a02a3fded93a]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7b7a4bfddbff - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hc090581d78f54d74
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/alloc/src/boxed.rs:2076:9
  13:     0x7b7a4bfddbff - std::panicking::rust_panic_with_hook::hbdbeac82afc1acf0
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/panicking.rs:801:13
  14:     0x7b7a4bfdd7f3 - std::panicking::begin_panic_handler::{{closure}}::hb29625ad0c873f9a
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/panicking.rs:660:13
  15:     0x7b7a4bfdafa9 - std::sys_common::backtrace::__rust_end_short_backtrace::h21cc071853db44df
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7b7a4bfdd4d4 - rust_begin_unwind
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/panicking.rs:658:5
  17:     0x7b7a4c027d33 - core::panicking::panic_fmt::h67c92866ee1e292f
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/core/src/panicking.rs:74:14
  18:     0x7b7a4c027dbc - core::panicking::panic::h0fbf55b944f855fa
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/core/src/panicking.rs:148:5
  19:     0x7b7a4a7cbd78 - <rustc_errors[1788d6f62428d411]::DiagCtxtInner>::emit_diagnostic
  20:     0x7b7a4a7cb1ab - <rustc_errors[1788d6f62428d411]::DiagCtxt>::emit_diagnostic
  21:     0x7b7a46a0cc07 - <() as rustc_errors[1788d6f62428d411]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  22:     0x7b7a4a5349b9 - rustc_middle[4ec70d05c774b409]::lint::lint_level::lint_level_impl
  23:     0x7b7a48c77de4 - <rustc_lint[5908b024461f3693]::early::EarlyContextAndPass<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass> as rustc_ast[1167729371985e7]::visit::Visitor>::visit_block
  24:     0x7b7a48c5fe80 - <rustc_lint[5908b024461f3693]::early::EarlyContextAndPass<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass> as rustc_ast[1167729371985e7]::visit::Visitor>::visit_expr::{closure#0}
  25:     0x7b7a48c2906d - <rustc_lint[5908b024461f3693]::early::EarlyContextAndPass<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint[5908b024461f3693]::early::EarlyContextAndPass<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass> as rustc_ast[1167729371985e7]::visit::Visitor>::visit_expr::{closure#0}>
  26:     0x7b7a48c78238 - <rustc_lint[5908b024461f3693]::early::EarlyContextAndPass<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass> as rustc_ast[1167729371985e7]::visit::Visitor>::visit_block
  27:     0x7b7a48c797f3 - <rustc_lint[5908b024461f3693]::early::EarlyContextAndPass<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass> as rustc_ast[1167729371985e7]::visit::Visitor>::visit_fn
  28:     0x7b7a48c4cef0 - rustc_ast[1167729371985e7]::visit::walk_assoc_item::<rustc_lint[5908b024461f3693]::early::EarlyContextAndPass<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass>, rustc_ast[1167729371985e7]::ast::ItemKind>
  29:     0x7b7a48c778c8 - <rustc_lint[5908b024461f3693]::early::EarlyContextAndPass<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass> as rustc_ast[1167729371985e7]::visit::Visitor>::visit_item
  30:     0x7b7a48c4d9c4 - rustc_lint[5908b024461f3693]::early::check_ast_node_inner::<rustc_lint[5908b024461f3693]::early::RuntimeCombinedEarlyLintPass, (&rustc_ast[1167729371985e7]::ast::Crate, &[rustc_ast[1167729371985e7]::ast::Attribute])>
  31:     0x7b7a4a1073b4 - rustc_interface[5e68df66c2caab02]::passes::early_lint_checks
  32:     0x7b7a4a105e31 - rustc_query_impl[56dcb2b13a3b378d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[56dcb2b13a3b378d]::query_impl::early_lint_checks::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 0usize]>>
  33:     0x7b7a4aa050c1 - rustc_query_system[8f2edcd73119e84f]::query::plumbing::try_execute_query::<rustc_query_impl[56dcb2b13a3b378d]::DynamicConfig<rustc_query_system[8f2edcd73119e84f]::query::caches::SingleCache<rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[56dcb2b13a3b378d]::plumbing::QueryCtxt, false>
  34:     0x7b7a4aa04ecf - rustc_query_impl[56dcb2b13a3b378d]::query_impl::early_lint_checks::get_query_non_incr::__rust_end_short_backtrace
  35:     0x7b7a4a1cc69e - rustc_ast_lowering[121b085c28c63178]::lower_to_hir
  36:     0x7b7a4aa06da2 - rustc_query_impl[56dcb2b13a3b378d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[56dcb2b13a3b378d]::query_impl::hir_crate::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 8usize]>>
  37:     0x7b7a4aa06112 - rustc_query_system[8f2edcd73119e84f]::query::plumbing::try_execute_query::<rustc_query_impl[56dcb2b13a3b378d]::DynamicConfig<rustc_query_system[8f2edcd73119e84f]::query::caches::SingleCache<rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[56dcb2b13a3b378d]::plumbing::QueryCtxt, false>
  38:     0x7b7a4aa05d1e - rustc_query_impl[56dcb2b13a3b378d]::query_impl::hir_crate::get_query_non_incr::__rust_end_short_backtrace
  39:     0x7b7a49de6521 - rustc_query_impl[56dcb2b13a3b378d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[56dcb2b13a3b378d]::query_impl::hir_attrs::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 8usize]>>
  40:     0x7b7a49de5adb - rustc_query_system[8f2edcd73119e84f]::query::plumbing::try_execute_query::<rustc_query_impl[56dcb2b13a3b378d]::DynamicConfig<rustc_query_system[8f2edcd73119e84f]::query::caches::VecCache<rustc_hir[615f113f9b51ba4f]::hir_id::OwnerId, rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[56dcb2b13a3b378d]::plumbing::QueryCtxt, false>
  41:     0x7b7a49de584f - rustc_query_impl[56dcb2b13a3b378d]::query_impl::hir_attrs::get_query_non_incr::__rust_end_short_backtrace
  42:     0x7b7a49dd5817 - <rustc_middle[4ec70d05c774b409]::hir::map::Map>::attrs
  43:     0x7b7a4aad1cc1 - rustc_passes[458f96c409ba88ee]::entry::entry_fn
  44:     0x7b7a4aad1c66 - rustc_query_impl[56dcb2b13a3b378d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[56dcb2b13a3b378d]::query_impl::entry_fn::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 12usize]>>
  45:     0x7b7a4aad1c49 - <rustc_query_impl[56dcb2b13a3b378d]::query_impl::entry_fn::dynamic_query::{closure#2} as core[255d19793ae049e7]::ops::function::FnOnce<(rustc_middle[4ec70d05c774b409]::ty::context::TyCtxt, ())>>::call_once
  46:     0x7b7a4aad1562 - rustc_query_system[8f2edcd73119e84f]::query::plumbing::try_execute_query::<rustc_query_impl[56dcb2b13a3b378d]::DynamicConfig<rustc_query_system[8f2edcd73119e84f]::query::caches::SingleCache<rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 12usize]>>, false, false, false>, rustc_query_impl[56dcb2b13a3b378d]::plumbing::QueryCtxt, false>
  47:     0x7b7a4aad1321 - rustc_query_impl[56dcb2b13a3b378d]::query_impl::entry_fn::get_query_non_incr::__rust_end_short_backtrace
  48:     0x7b7a4a6845f2 - rustc_interface[5e68df66c2caab02]::passes::analysis
  49:     0x7b7a4a684407 - rustc_query_impl[56dcb2b13a3b378d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[56dcb2b13a3b378d]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 1usize]>>
  50:     0x7b7a4aa07565 - rustc_query_system[8f2edcd73119e84f]::query::plumbing::try_execute_query::<rustc_query_impl[56dcb2b13a3b378d]::DynamicConfig<rustc_query_system[8f2edcd73119e84f]::query::caches::SingleCache<rustc_middle[4ec70d05c774b409]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[56dcb2b13a3b378d]::plumbing::QueryCtxt, false>
  51:     0x7b7a4aa072cf - rustc_query_impl[56dcb2b13a3b378d]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  52:     0x7b7a4a8805d2 - rustc_interface[5e68df66c2caab02]::interface::run_compiler::<core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>, rustc_driver_impl[b19a02a3fded93a]::run_compiler::{closure#0}>::{closure#1}
  53:     0x7b7a4a8b13e7 - std[a95b5bdb0bb4e4d9]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5e68df66c2caab02]::util::run_in_thread_with_globals<rustc_interface[5e68df66c2caab02]::util::run_in_thread_pool_with_globals<rustc_interface[5e68df66c2caab02]::interface::run_compiler<core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>, rustc_driver_impl[b19a02a3fded93a]::run_compiler::{closure#0}>::{closure#1}, core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>>::{closure#0}, core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>>
  54:     0x7b7a4a8b11aa - <<std[a95b5bdb0bb4e4d9]::thread::Builder>::spawn_unchecked_<rustc_interface[5e68df66c2caab02]::util::run_in_thread_with_globals<rustc_interface[5e68df66c2caab02]::util::run_in_thread_pool_with_globals<rustc_interface[5e68df66c2caab02]::interface::run_compiler<core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>, rustc_driver_impl[b19a02a3fded93a]::run_compiler::{closure#0}>::{closure#1}, core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>>::{closure#0}, core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[255d19793ae049e7]::result::Result<(), rustc_span[949d05b7d8fa239b]::ErrorGuaranteed>>::{closure#2} as core[255d19793ae049e7]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  55:     0x7b7a4bfe7a7b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0425b9f5e54ebe0c
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/alloc/src/boxed.rs:2062:9
  56:     0x7b7a4bfe7a7b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h54d26adcfa3b7e83
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/alloc/src/boxed.rs:2062:9
  57:     0x7b7a4bfe7a7b - std::sys::pal::unix::thread::Thread::new::thread_start::h1619c9bedefd3e87
                               at /rustc/1d1356d0f67131f97b4f1631a24cd10d7dbcca42/library/std/src/sys/pal/unix/thread.rs:108:17
  58:     0x7b7a454a6ded - <unknown>
  59:     0x7b7a4552a0dc - <unknown>
  60:                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 (1d1356d0f 2024-06-15) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z unstable-options -Z dump-mir-dir=dir

query stack during panic:
#0 [early_lint_checks] perform lints prior to macro expansion
#1 [hir_crate] getting the crate HIR
end of query stack
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0658`.

@rustbot label +F-stmt_expr_attributes

[matthiaskrgr]

bisects to #120699 🤔 cc @nnethercote

edit: ah the assertion was added there...

[matthiaskrgr]

macro_rules! foo {
    ($val:ident) => {
        true;
    };
}

fn main() {
    #[expect(semicolon_in_expressions_from_macros)]
    let _ = foo!(x);
}