[ICE]: generics_of: unexpected node kind Crate(Mod #151708
Description
auto-reduced (treereduce-rust):
#![feature(min_generic_const_args)]
const N: usize = 2;
trait CollectArray<A> {
fn inner_array(&mut self) -> [A; N];
}
fn main() {}original:
//@ run-pass
//@ compile-flags:-Zmir-opt-level=3
use std::mem::MaybeUninit;
const N: usize = 2;
trait CollectArray<A>: Iterator<Item = A> {
fn inner_array(&mut self) -> [A; N];
fn collect_array(&mut self) -> [A; N] {
let result = self.inner_array();
assert!(self.next().is_none());
result
}
}
impl<A, I: Sized> CollectArray<A> for I
where
I: Iterator<Item = A>,
{
fn inner_array(&mut self) -> [A; N] {
let mut result: [MaybeUninit<A>; N] = unsafe { MaybeUninit::uninit().assume_init() };
for (dest, item) in result.iter_mut().zip(self) {
*dest = MaybeUninit::new(item);
}
let temp_ptr: *const [MaybeUninit<A>; N] = &result;
unsafe { std::ptr::read(temp_ptr as *const [A; N]) }
}
}
fn main() {
assert_eq!(
[[1, 2], [3, 4]]
.iter()
.map(|row| row.iter().collect_array())
.collect_array(),
[[&1, &2], [&3, &4]]
);
}Version information
rustc 1.95.0-nightly (474276961 2026-01-26)
binary: rustc
commit-hash: 474276961f48b0d05f4ea260ba400096b027584e
commit-date: 2026-01-26
host: x86_64-unknown-linux-gnu
release: 1.95.0-nightly
LLVM version: 21.1.8
Possibly related line of code:
rust/compiler/rustc_hir_analysis/src/collect/generics_of.rs
Lines 206 to 218 in 4742769
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zcrate-attr=feature(min_generic_const_args)
Program output
warning: the feature `min_generic_const_args` is incomplete and may not be safe to use and/or cause compiler crashes
--> <crate attribute>:1:12
|
1 | #![feature(min_generic_const_args)]
| ^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #132980 <https://github.com/rust-lang/rust/issues/132980> for more information
= note: `#[warn(incomplete_features)]` on by default
warning: constant `N` is never used
--> /tmp/icemaker_global_tempdir.gU4NCxAeVxD3/rustc_testrunner_tmpdir_reporting.uVKmc2tJ06T0/mvce.rs:1:7
|
1 | const N: usize = 2;
| ^
|
= note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
warning: trait `CollectArray` is never used
--> /tmp/icemaker_global_tempdir.gU4NCxAeVxD3/rustc_testrunner_tmpdir_reporting.uVKmc2tJ06T0/mvce.rs:3:7
|
3 | trait CollectArray<A> {
| ^^^^^^^^^^^^
error: internal compiler error: /rustc-dev/474276961f48b0d05f4ea260ba400096b027584e/compiler/rustc_hir_analysis/src/collect/generics_of.rs:212:14: generics_of: unexpected node kind Crate(Mod { spans: ModSpans { inner_span: /tmp/icemaker_global_tempdir.gU4NCxAeVxD3/rustc_testrunner_tmpdir_reporting.uVKmc2tJ06T0/mvce.rs:1:1: 7:13 (#0), inject_use_span: no-location (#0) }, item_ids: [ItemId { owner_id: DefId(0:1 ~ mvce[a1f3]::std) }, ItemId { owner_id: DefId(0:2 ~ mvce[a1f3]::{use#0}) }, ItemId { owner_id: DefId(0:3 ~ mvce[a1f3]::N) }, ItemId { owner_id: DefId(0:4 ~ mvce[a1f3]::CollectArray) }, ItemId { owner_id: DefId(0:7 ~ mvce[a1f3]::main) }] })
--> /tmp/icemaker_global_tempdir.gU4NCxAeVxD3/rustc_testrunner_tmpdir_reporting.uVKmc2tJ06T0/mvce.rs:1:1
|
1 | / const N: usize = 2;
2 | |
3 | | trait CollectArray<A> {
4 | | fn inner_array(&mut self) -> [A; N];
... |
7 | | fn main() {}
| |____________^
thread 'rustc' (4043844) panicked at /rustc-dev/474276961f48b0d05f4ea260ba400096b027584e/compiler/rustc_hir_analysis/src/collect/generics_of.rs:212:14:
Box<dyn Any>
stack backtrace:
0: 0x7fd43ac39a03 - <<std[8cc15e19e2a5acfa]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[ea2bd7cd219b3eb9]::fmt::Display>::fmt
1: 0x7fd43b20e61c - core[ea2bd7cd219b3eb9]::fmt::write
2: 0x7fd43ac501a6 - <std[8cc15e19e2a5acfa]::sys::stdio::unix::Stderr as std[8cc15e19e2a5acfa]::io::Write>::write_fmt
3: 0x7fd43ac0f898 - std[8cc15e19e2a5acfa]::panicking::default_hook::{closure#0}
4: 0x7fd43ac2d033 - std[8cc15e19e2a5acfa]::panicking::default_hook
5: 0x7fd439c18d2d - std[8cc15e19e2a5acfa]::panicking::update_hook::<alloc[d48b8b032ee4278d]::boxed::Box<rustc_driver_impl[b96920060a9f9ce8]::install_ice_hook::{closure#1}>>::{closure#0}
6: 0x7fd43ac2d312 - std[8cc15e19e2a5acfa]::panicking::panic_with_hook
7: 0x7fd439c4d2c1 - std[8cc15e19e2a5acfa]::panicking::begin_panic::<rustc_errors[229f37ed4a6a6271]::ExplicitBug>::{closure#0}
8: 0x7fd439c45ea6 - std[8cc15e19e2a5acfa]::sys::backtrace::__rust_end_short_backtrace::<std[8cc15e19e2a5acfa]::panicking::begin_panic<rustc_errors[229f37ed4a6a6271]::ExplicitBug>::{closure#0}, !>
9: 0x7fd439c43aa9 - std[8cc15e19e2a5acfa]::panicking::begin_panic::<rustc_errors[229f37ed4a6a6271]::ExplicitBug>
10: 0x7fd439c58421 - <rustc_errors[229f37ed4a6a6271]::diagnostic::BugAbort as rustc_errors[229f37ed4a6a6271]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
11: 0x7fd43a1dd3fc - <rustc_errors[229f37ed4a6a6271]::DiagCtxtHandle>::span_bug::<rustc_span[94ae33b9311191df]::span_encoding::Span, alloc[d48b8b032ee4278d]::string::String>
12: 0x7fd43a205cb6 - rustc_middle[8d85aae3cf006bd8]::util::bug::opt_span_bug_fmt::<rustc_span[94ae33b9311191df]::span_encoding::Span>::{closure#0}
13: 0x7fd43a205e62 - rustc_middle[8d85aae3cf006bd8]::ty::context::tls::with_opt::<rustc_middle[8d85aae3cf006bd8]::util::bug::opt_span_bug_fmt<rustc_span[94ae33b9311191df]::span_encoding::Span>::{closure#0}, !>::{closure#0}
14: 0x7fd43a1f6f5b - rustc_middle[8d85aae3cf006bd8]::ty::context::tls::with_context_opt::<rustc_middle[8d85aae3cf006bd8]::ty::context::tls::with_opt<rustc_middle[8d85aae3cf006bd8]::util::bug::opt_span_bug_fmt<rustc_span[94ae33b9311191df]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
15: 0x7fd437b0d2a8 - rustc_middle[8d85aae3cf006bd8]::util::bug::span_bug_fmt::<rustc_span[94ae33b9311191df]::span_encoding::Span>
16: 0x7fd43bad6141 - rustc_hir_analysis[a3c3123a8725cc24]::collect::generics_of::generics_of
17: 0x7fd43b211269 - rustc_query_impl[f52eeba12e8a164a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f52eeba12e8a164a]::query_impl::generics_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 8usize]>>
18: 0x7fd43b211945 - rustc_query_system[54a10b0b4f070675]::query::plumbing::try_execute_query::<rustc_query_impl[f52eeba12e8a164a]::DynamicConfig<rustc_query_system[54a10b0b4f070675]::query::caches::DefIdCache<rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[f52eeba12e8a164a]::plumbing::QueryCtxt, false>
19: 0x7fd43b21166b - rustc_query_impl[f52eeba12e8a164a]::query_impl::generics_of::get_query_non_incr::__rust_end_short_backtrace
20: 0x7fd43c3da63c - <rustc_middle[8d85aae3cf006bd8]::ty::context::TyCtxt as rustc_type_ir[f9818e68c953de5]::interner::Interner>::generics_of
21: 0x7fd43aa25d9a - <rustc_type_ir[f9818e68c953de5]::predicate::TraitRef<rustc_middle[8d85aae3cf006bd8]::ty::context::TyCtxt>>::from_assoc
22: 0x7fd43d11944d - <rustc_trait_selection[326fa56f4f3ccdfa]::traits::dyn_compatibility::IllegalSelfTypeVisitor as rustc_type_ir[f9818e68c953de5]::visit::TypeVisitor<rustc_middle[8d85aae3cf006bd8]::ty::context::TyCtxt>>::visit_const.cold
23: 0x7fd43c21484d - rustc_trait_selection[326fa56f4f3ccdfa]::traits::dyn_compatibility::contains_illegal_self_type_reference::<rustc_type_ir[f9818e68c953de5]::binder::Binder<rustc_middle[8d85aae3cf006bd8]::ty::context::TyCtxt, rustc_middle[8d85aae3cf006bd8]::ty::Ty>>
24: 0x7fd43c214b08 - rustc_trait_selection[326fa56f4f3ccdfa]::traits::dyn_compatibility::virtual_call_violations_for_method
25: 0x7fd43c21b130 - rustc_trait_selection[326fa56f4f3ccdfa]::traits::dyn_compatibility::dyn_compatibility_violations_for_assoc_item
26: 0x7fd43c21adda - <core[ea2bd7cd219b3eb9]::iter::adapters::flatten::FlatMap<core[ea2bd7cd219b3eb9]::iter::adapters::map::Map<core[ea2bd7cd219b3eb9]::iter::adapters::map::Map<core[ea2bd7cd219b3eb9]::slice::iter::Iter<(core[ea2bd7cd219b3eb9]::option::Option<rustc_span[94ae33b9311191df]::symbol::Symbol>, rustc_middle[8d85aae3cf006bd8]::ty::assoc::AssocItem)>, <rustc_data_structures[80b3ed06db703e49]::sorted_map::index_map::SortedIndexMultiMap<u32, core[ea2bd7cd219b3eb9]::option::Option<rustc_span[94ae33b9311191df]::symbol::Symbol>, rustc_middle[8d85aae3cf006bd8]::ty::assoc::AssocItem>>::iter::{closure#0}>, <rustc_middle[8d85aae3cf006bd8]::ty::assoc::AssocItems>::in_definition_order::{closure#0}>, alloc[d48b8b032ee4278d]::vec::Vec<rustc_middle[8d85aae3cf006bd8]::traits::DynCompatibilityViolation>, rustc_trait_selection[326fa56f4f3ccdfa]::traits::dyn_compatibility::dyn_compatibility_violations_for_trait::{closure#0}::{closure#0}> as core[ea2bd7cd219b3eb9]::iter::traits::iterator::Iterator>::next
27: 0x7fd43c218d06 - <core[ea2bd7cd219b3eb9]::iter::adapters::GenericShunt<core[ea2bd7cd219b3eb9]::iter::adapters::map::Map<core[ea2bd7cd219b3eb9]::iter::adapters::flatten::FlatMap<core[ea2bd7cd219b3eb9]::iter::sources::from_fn::FromFn<rustc_type_ir[f9818e68c953de5]::elaborate::supertrait_def_ids<rustc_middle[8d85aae3cf006bd8]::ty::context::TyCtxt>::{closure#0}>, alloc[d48b8b032ee4278d]::vec::Vec<rustc_middle[8d85aae3cf006bd8]::traits::DynCompatibilityViolation>, rustc_trait_selection[326fa56f4f3ccdfa]::traits::dyn_compatibility::dyn_compatibility_violations::{closure#0}>, core[ea2bd7cd219b3eb9]::result::Result<rustc_middle[8d85aae3cf006bd8]::traits::DynCompatibilityViolation, !>::Ok>, core[ea2bd7cd219b3eb9]::result::Result<core[ea2bd7cd219b3eb9]::convert::Infallible, !>> as core[ea2bd7cd219b3eb9]::iter::traits::iterator::Iterator>::next
28: 0x7fd43c21805b - rustc_trait_selection[326fa56f4f3ccdfa]::traits::dyn_compatibility::dyn_compatibility_violations
29: 0x7fd43c217f54 - rustc_query_impl[f52eeba12e8a164a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f52eeba12e8a164a]::query_impl::dyn_compatibility_violations::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 16usize]>>
30: 0x7fd43c217f21 - <rustc_query_impl[f52eeba12e8a164a]::query_impl::dyn_compatibility_violations::dynamic_query::{closure#2} as core[ea2bd7cd219b3eb9]::ops::function::FnOnce<(rustc_middle[8d85aae3cf006bd8]::ty::context::TyCtxt, rustc_span[94ae33b9311191df]::def_id::DefId)>>::call_once
31: 0x7fd43b3265db - rustc_query_system[54a10b0b4f070675]::query::plumbing::try_execute_query::<rustc_query_impl[f52eeba12e8a164a]::DynamicConfig<rustc_query_system[54a10b0b4f070675]::query::caches::DefIdCache<rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[f52eeba12e8a164a]::plumbing::QueryCtxt, false>
32: 0x7fd43c09da9e - rustc_query_impl[f52eeba12e8a164a]::query_impl::dyn_compatibility_violations::get_query_non_incr::__rust_end_short_backtrace
33: 0x7fd43c09db4e - rustc_trait_selection[326fa56f4f3ccdfa]::traits::dyn_compatibility::is_dyn_compatible
34: 0x7fd43c09dad3 - rustc_query_impl[f52eeba12e8a164a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f52eeba12e8a164a]::query_impl::is_dyn_compatible::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 1usize]>>
35: 0x7fd43b7c4817 - rustc_query_system[54a10b0b4f070675]::query::plumbing::try_execute_query::<rustc_query_impl[f52eeba12e8a164a]::DynamicConfig<rustc_query_system[54a10b0b4f070675]::query::caches::DefIdCache<rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[f52eeba12e8a164a]::plumbing::QueryCtxt, false>
36: 0x7fd43b6e2250 - rustc_query_impl[f52eeba12e8a164a]::query_impl::is_dyn_compatible::get_query_non_incr::__rust_end_short_backtrace
37: 0x7fd43bbc0a8b - <rustc_lint[c1072c7a935321f8]::BuiltinCombinedModuleLateLintPass as rustc_lint[c1072c7a935321f8]::passes::LateLintPass>::check_item
38: 0x7fd43bbb4df2 - <rustc_lint[c1072c7a935321f8]::late::LateContextAndPass<rustc_lint[c1072c7a935321f8]::BuiltinCombinedModuleLateLintPass> as rustc_hir[f8bf578c86c342b0]::intravisit::Visitor>::visit_nested_item
39: 0x7fd43bbb36ed - rustc_lint[c1072c7a935321f8]::lint_mod
40: 0x7fd43bbb3297 - rustc_query_impl[f52eeba12e8a164a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f52eeba12e8a164a]::query_impl::lint_mod::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 0usize]>>
41: 0x7fd43bff836b - rustc_query_system[54a10b0b4f070675]::query::plumbing::try_execute_query::<rustc_query_impl[f52eeba12e8a164a]::DynamicConfig<rustc_query_system[54a10b0b4f070675]::query::caches::DefaultCache<rustc_span[94ae33b9311191df]::def_id::LocalModDefId, rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[f52eeba12e8a164a]::plumbing::QueryCtxt, false>
42: 0x7fd43bff97d5 - rustc_query_impl[f52eeba12e8a164a]::query_impl::lint_mod::get_query_non_incr::__rust_end_short_backtrace
43: 0x7fd43bff9390 - rustc_lint[c1072c7a935321f8]::late::check_crate::{closure#1}
44: 0x7fd43bff8f7a - rustc_lint[c1072c7a935321f8]::late::check_crate
45: 0x7fd43b3638da - rustc_interface[4728fac6abb1a1aa]::passes::analysis
46: 0x7fd43b363009 - rustc_query_impl[f52eeba12e8a164a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f52eeba12e8a164a]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 0usize]>>
47: 0x7fd43c3d3d91 - rustc_query_system[54a10b0b4f070675]::query::plumbing::try_execute_query::<rustc_query_impl[f52eeba12e8a164a]::DynamicConfig<rustc_query_system[54a10b0b4f070675]::query::caches::SingleCache<rustc_middle[8d85aae3cf006bd8]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[f52eeba12e8a164a]::plumbing::QueryCtxt, false>
48: 0x7fd43c3d3b7c - rustc_query_impl[f52eeba12e8a164a]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
49: 0x7fd43c5b31d1 - <rustc_interface[4728fac6abb1a1aa]::passes::create_and_enter_global_ctxt<core[ea2bd7cd219b3eb9]::option::Option<rustc_interface[4728fac6abb1a1aa]::queries::Linker>, rustc_driver_impl[b96920060a9f9ce8]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[ea2bd7cd219b3eb9]::ops::function::FnOnce<(&rustc_session[a8d494af7dba883f]::session::Session, rustc_middle[8d85aae3cf006bd8]::ty::context::CurrentGcx, alloc[d48b8b032ee4278d]::sync::Arc<rustc_data_structures[80b3ed06db703e49]::jobserver::Proxy>, &std[8cc15e19e2a5acfa]::sync::once_lock::OnceLock<rustc_middle[8d85aae3cf006bd8]::ty::context::GlobalCtxt>, &rustc_data_structures[80b3ed06db703e49]::sync::worker_local::WorkerLocal<rustc_middle[8d85aae3cf006bd8]::arena::Arena>, &rustc_data_structures[80b3ed06db703e49]::sync::worker_local::WorkerLocal<rustc_hir[f8bf578c86c342b0]::Arena>, rustc_driver_impl[b96920060a9f9ce8]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
50: 0x7fd43c3e73eb - rustc_interface[4728fac6abb1a1aa]::interface::run_compiler::<(), rustc_driver_impl[b96920060a9f9ce8]::run_compiler::{closure#0}>::{closure#1}
51: 0x7fd43c436dbe - std[8cc15e19e2a5acfa]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[4728fac6abb1a1aa]::util::run_in_thread_with_globals<rustc_interface[4728fac6abb1a1aa]::util::run_in_thread_pool_with_globals<rustc_interface[4728fac6abb1a1aa]::interface::run_compiler<(), rustc_driver_impl[b96920060a9f9ce8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
52: 0x7fd43c4372e0 - <std[8cc15e19e2a5acfa]::thread::lifecycle::spawn_unchecked<rustc_interface[4728fac6abb1a1aa]::util::run_in_thread_with_globals<rustc_interface[4728fac6abb1a1aa]::util::run_in_thread_pool_with_globals<rustc_interface[4728fac6abb1a1aa]::interface::run_compiler<(), rustc_driver_impl[b96920060a9f9ce8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[ea2bd7cd219b3eb9]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
53: 0x7fd43c43816c - <std[8cc15e19e2a5acfa]::sys::thread::unix::Thread>::new::thread_start
54: 0x7fd435c9698b - <unknown>
55: 0x7fd435d1a9cc - <unknown>
56: 0x0 - <unknown>
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 1.95.0-nightly (474276961 2026-01-26) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z crate-attr=feature(min_generic_const_args) -Z dump-mir-dir=dir
query stack during panic:
#0 [generics_of] computing generics of ``
#1 [dyn_compatibility_violations] determining dyn-compatibility of trait `CollectArray`
#2 [is_dyn_compatible] checking if trait `CollectArray` is dyn-compatible
#3 [lint_mod] linting top-level module
#4 [analysis] running analysis passes on crate `mvce`
end of query stack
error: aborting due to 1 previous error; 3 warnings emitted
@rustbot label +F-min_generic_const_args
