rust-lang / rust-lang/rust

[ICE]: `DefId does not appear in children of DefId`

Open
#158,243 3 comments 0 reactions 1 assignee View on GitHub

@cjgillot is already working on this.

Since Jun 22, 2026.

C-bug I-ICE S-bug-has-test S-has-mcve T-compiler
Dominant language
Rust
Stars
119k
Forks
16.1k
PR metrics pending

Description

Code
fn make_coroutine() {
    |assert_eq!(
        3,
        foo(|()| {
            use std::ops::Add;
            v.add(3);
        })
    )| {};
}

fn main() {}

A mutant of glacier2's fixed/121096-1.rs, simplified manually.

Meta

rustc --version --verbose:

rustc 1.98.0-nightly (91fe22da8 2026-06-21)
binary: rustc
commit-hash: 91fe22da8084a1c9e993d78d4a56f22ab8396236
commit-date: 2026-06-21
host: x86_64-apple-darwin
release: 1.98.0-nightly
LLVM version: 22.1.7
Error output

command: rustc

error: expected identifier, found keyword `match`
  --> abcd.rs:2:6
   |
 2 |       |assert_eq!(
   |  ______^
 3 | |         3,
 4 | |         foo(|()| {
 5 | |             use std::ops::Add;
 6 | |             v.add(3);
 7 | |         })
 8 | |     )| {};
   | |_____^ expected identifier, found keyword
   |
help: escape `match` to use it as an identifier
  --> /Users/jb/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/macros/mod.rs:44:9
   |
44 |         r#match (&$left, &$right) {
   |         ++

error: macro expansion ignores `{` and any tokens following
  --> /Users/jb/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/macros/mod.rs:44:33
   |
44 |           match (&$left, &$right) {
   |                                   ^
   |
  ::: abcd.rs:2:6
   |
 2 |       |assert_eq!(
   |  ______-
 3 | |         3,
 4 | |         foo(|()| {
 5 | |             use std::ops::Add;
 6 | |             v.add(3);
 7 | |         })
 8 | |     )| {};
   | |_____- caused by the macro expansion here
   |
   = note: the usage of `assert_eq!` is likely invalid in pattern context

error[E0425]: cannot find value `v` in this scope
 --> abcd.rs:6:13
  |
6 |             v.add(3);
  |             ^ not found in this scope

error[E0531]: cannot find tuple struct or tuple variant `r#match` in this scope
 --> abcd.rs:2:6
  |
2 |       |assert_eq!(
  |  ______^
3 | |         3,
4 | |         foo(|()| {
5 | |             use std::ops::Add;
6 | |             v.add(3);
7 | |         })
8 | |     )| {};
  | |_____^ not found in this scope

error: arbitrary expressions aren't allowed in patterns
 --> abcd.rs:4:9
  |
4 | /         foo(|()| {
5 | |             use std::ops::Add;
6 | |             v.add(3);
7 | |         })
  | |__________^
  |
  = note: the `expr` fragment specifier forces the metavariable's content to be an expression


thread 'rustc' (12434060) panicked at /rustc-dev/91fe22da8084a1c9e993d78d4a56f22ab8396236/compiler/rustc_ast_lowering/src/lib.rs:643:13:
DefId(0:6 ~ abcd[aa16]::make_coroutine::{closure#0}::{closure#0}) does not appear in children of DefId(0:3 ~ abcd[aa16]::make_coroutine)
Backtrace 

thread 'rustc' (12434060) panicked at /rustc-dev/91fe22da8084a1c9e993d78d4a56f22ab8396236/compiler/rustc_ast_lowering/src/lib.rs:643:13:
DefId(0:6 ~ abcd[aa16]::make_coroutine::{closure#0}::{closure#0}) does not appear in children of DefId(0:3 ~ abcd[aa16]::make_coroutine)
stack backtrace:
   0:        0x1094ac3a5 - <<std[a20328c213e1acde]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[e554cc35b0d1b68]::fmt::Display>::fmt
   1:        0x10602b707 - core[e554cc35b0d1b68]::fmt::write
   2:        0x1094c3ca5 - <std[a20328c213e1acde]::sys::stdio::unix::Stderr as std[a20328c213e1acde]::io::Write>::write_fmt
   3:        0x10947b754 - std[a20328c213e1acde]::panicking::default_hook::{closure#0}
   4:        0x10949ca37 - std[a20328c213e1acde]::panicking::default_hook
   5:        0x106e03c24 - std[a20328c213e1acde]::panicking::update_hook::<alloc[ceb85cf88a7697a4]::boxed::Box<rustc_driver_impl[9fe47791ec7f9771]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x10949cdf7 - std[a20328c213e1acde]::panicking::panic_with_hook
   7:        0x10947b811 - std[a20328c213e1acde]::panicking::panic_handler::{closure#0}
   8:        0x10946f649 - std[a20328c213e1acde]::sys::backtrace::__rust_end_short_backtrace::<std[a20328c213e1acde]::panicking::panic_handler::{closure#0}, !>
   9:        0x10947cdf4 - __rustc[d0241b7fe89c64df]::rust_begin_unwind
  10:        0x10958712b - core[e554cc35b0d1b68]::panicking::panic_fmt
  11:        0x1095c31fb - rustc_ast_lowering[315b6ebe866b0d06]::lower_to_hir::{closure#0}::{closure#0}
  12:        0x106300a87 - rustc_ast_lowering[315b6ebe866b0d06]::lower_to_hir::{closure#0}
  13:        0x1063100cf - rustc_ast_lowering[315b6ebe866b0d06]::lower_to_hir
  14:        0x108885ad6 - rustc_query_impl[a66d654594d8defc]::query_impl::lower_to_hir::invoke_provider_fn::__rust_begin_short_backtrace
  15:        0x10865684c - rustc_query_impl[a66d654594d8defc]::execution::try_execute_query::<rustc_data_structures[8122b38ee432a77]::vec_cache::VecCache<rustc_span[6c206711ced636e2]::def_id::LocalDefId, rustc_middle[998151d76a1f1c67]::query::erase::ErasedData<[u8; 16usize]>, rustc_middle[998151d76a1f1c67]::dep_graph::graph::DepNodeIndex>, false>
  16:        0x108885b6c - rustc_query_impl[a66d654594d8defc]::query_impl::lower_to_hir::execute_query_non_incr::__rust_end_short_backtrace
  17:        0x1078a0412 - <rustc_middle[998151d76a1f1c67]::hir::provide::{closure#1} as core[e554cc35b0d1b68]::ops::function::FnOnce<(rustc_middle[998151d76a1f1c67]::ty::context::TyCtxt, rustc_span[6c206711ced636e2]::def_id::LocalDefId)>>::call_once
  18:        0x1088bde26 - rustc_query_impl[a66d654594d8defc]::query_impl::hir_owner::invoke_provider_fn::__rust_begin_short_backtrace
  19:        0x10865de51 - rustc_query_impl[a66d654594d8defc]::execution::try_execute_query::<rustc_data_structures[8122b38ee432a77]::vec_cache::VecCache<rustc_span[6c206711ced636e2]::def_id::LocalDefId, rustc_middle[998151d76a1f1c67]::query::erase::ErasedData<[u8; 32usize]>, rustc_middle[998151d76a1f1c67]::dep_graph::graph::DepNodeIndex>, false>
  20:        0x1088bdecf - rustc_query_impl[a66d654594d8defc]::query_impl::hir_owner::execute_query_non_incr::__rust_end_short_backtrace
  21:        0x107c5d2fc - <rustc_middle[998151d76a1f1c67]::ty::context::TyCtxt>::hir_owner_parent
  22:        0x107be45c2 - <rustc_middle[998151d76a1f1c67]::lint::ShallowLintLevelMap>::lint_level_spec_at_node::{closure#0}::{closure#0}
  23:        0x107c31f6a - <rustc_middle[998151d76a1f1c67]::lint::ShallowLintLevelMap>::lint_level_spec_at_node
  24:        0x107c3f225 - <rustc_middle[998151d76a1f1c67]::ty::context::TyCtxt>::lint_level_spec_at_node
  25:        0x1071a3b02 - rustc_hir_analysis[c311080b1fc768c4]::check_unused::check_unused_traits
  26:        0x108694053 - rustc_query_impl[a66d654594d8defc]::execution::try_execute_query::<rustc_middle[998151d76a1f1c67]::query::caches::SingleCache<rustc_middle[998151d76a1f1c67]::query::erase::ErasedData<[u8; 0usize]>>, false>
  27:        0x10889c522 - rustc_query_impl[a66d654594d8defc]::query_impl::check_unused_traits::execute_query_non_incr::__rust_end_short_backtrace
  28:        0x10714e9c2 - rustc_hir_analysis[c311080b1fc768c4]::check_crate
  29:        0x107826701 - rustc_interface[16404cc120fb2eee]::passes::analysis
  30:        0x108694053 - rustc_query_impl[a66d654594d8defc]::execution::try_execute_query::<rustc_middle[998151d76a1f1c67]::query::caches::SingleCache<rustc_middle[998151d76a1f1c67]::query::erase::ErasedData<[u8; 0usize]>>, false>
  31:        0x1088bc742 - rustc_query_impl[a66d654594d8defc]::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
  32:        0x106db0c9f - rustc_interface[16404cc120fb2eee]::passes::create_and_enter_global_ctxt::<core[e554cc35b0d1b68]::option::Option<rustc_interface[16404cc120fb2eee]::queries::Linker>, rustc_driver_impl[9fe47791ec7f9771]::run_compiler::{closure#0}::{closure#2}>
  33:        0x106e03019 - rustc_interface[16404cc120fb2eee]::interface::run_compiler::<(), rustc_driver_impl[9fe47791ec7f9771]::run_compiler::{closure#0}>::{closure#1}
  34:        0x106df81e1 - std[a20328c213e1acde]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[16404cc120fb2eee]::util::run_in_thread_with_globals<rustc_interface[16404cc120fb2eee]::util::run_in_thread_pool_with_globals<rustc_interface[16404cc120fb2eee]::interface::run_compiler<(), rustc_driver_impl[9fe47791ec7f9771]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  35:        0x106e0c1eb - <std[a20328c213e1acde]::thread::lifecycle::spawn_unchecked<rustc_interface[16404cc120fb2eee]::util::run_in_thread_with_globals<rustc_interface[16404cc120fb2eee]::util::run_in_thread_pool_with_globals<rustc_interface[16404cc120fb2eee]::interface::run_compiler<(), rustc_driver_impl[9fe47791ec7f9771]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[e554cc35b0d1b68]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  36:        0x1094a8d51 - <std[a20328c213e1acde]::sys::thread::unix::Thread>::new::thread_start
  37:     0x7ff817d62e05 - __pthread_start

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: please attach the file at `/Volumes/T7/workspace/260622_ice_case_review/tmp/rustc-ice-2026-06-22T10_34_25-8659.txt` to your bug report

note: rustc 1.98.0-nightly (91fe22da8 2026-06-21) running on x86_64-apple-darwin

query stack during panic:
#0 [lower_to_hir] lowering HIR for `make_coroutine::{closure#0}::{closure#0}`
#1 [hir_owner] getting owner for `make_coroutine::{closure#0}::{closure#0}`
... and 2 other queries... use `env RUST_BACKTRACE=1` to see the full query stack
error[E0425]: cannot find function `foo` in this scope
 --> abcd.rs:4:9
  |
4 |         foo(|()| {
  |         ^^^ not found in this scope

error: aborting due to 6 previous errors

Some errors have detailed explanations: E0425, E0531.
For more information about an error, try `rustc --explain E0425`.

Notes

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Assessment

This issue has not been assessed yet.

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.