[ICE]: attempting to project to field at offset 0 with size 8 into immediate #152653
Description
auto-reduced (treereduce-rust):
type const CONST: usize = 1i32;
fn uses_const() {
CONST;
}original:
//@ check-pass
// This test should compile without an ICE.
#![expect(incomplete_features)]
#![Debug(min_generic_const_args)]
type const CONST: usize = 1i32;
fn uses_const() {
CONST;
}
fn main() { (1i32, 'a') }Version information
rustc 1.95.0-nightly (75b9d89c6 2026-02-15)
binary: rustc
commit-hash: 75b9d89c68a4a92758349272aa4e35a8eb7a6708
commit-date: 2026-02-15
host: x86_64-unknown-linux-gnu
release: 1.95.0-nightly
LLVM version: 22.1.0
Possibly related line of code:
rust/compiler/rustc_const_eval/src/interpret/operand.rs
Lines 381 to 393 in 75b9d89
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc
Program output
error[E0658]: `type const` syntax is experimental
--> /tmp/icemaker_global_tempdir.jrAx15H5Wv2o/rustc_testrunner_tmpdir_reporting.lglgTxuY3juB/mvce.rs:1:1
|
1 | type const CONST: usize = 1i32;
| ^^^^^^^^^^
|
= note: see issue #132980 <https://github.com/rust-lang/rust/issues/132980> for more information
= help: add `#![feature(min_generic_const_args)]` to the crate attributes to enable
= note: this compiler was built on 2026-02-15; consider upgrading it if it is out of date
error[E0658]: top-level `type const` are unstable
--> /tmp/icemaker_global_tempdir.jrAx15H5Wv2o/rustc_testrunner_tmpdir_reporting.lglgTxuY3juB/mvce.rs:1:1
|
1 | type const CONST: usize = 1i32;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #132980 <https://github.com/rust-lang/rust/issues/132980> for more information
= help: add `#![feature(min_generic_const_args)]` to the crate attributes to enable
= note: this compiler was built on 2026-02-15; consider upgrading it if it is out of date
error[E0601]: `main` function not found in crate `mvce`
--> /tmp/icemaker_global_tempdir.jrAx15H5Wv2o/rustc_testrunner_tmpdir_reporting.lglgTxuY3juB/mvce.rs:5:2
|
5 | }
| ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.jrAx15H5Wv2o/rustc_testrunner_tmpdir_reporting.lglgTxuY3juB/mvce.rs`
error: the constant `1` is not of type `usize`
--> /tmp/icemaker_global_tempdir.jrAx15H5Wv2o/rustc_testrunner_tmpdir_reporting.lglgTxuY3juB/mvce.rs:1:1
|
1 | type const CONST: usize = 1i32;
| ^^^^^^^^^^^^^^^^^^^^^^^ expected `usize`, found `i32`
error[E0308]: mismatched types
--> /tmp/icemaker_global_tempdir.jrAx15H5Wv2o/rustc_testrunner_tmpdir_reporting.lglgTxuY3juB/mvce.rs:1:27
|
1 | type const CONST: usize = 1i32;
| ^^^^ expected `usize`, found `i32`
|
help: change the type of the numeric literal from `i32` to `usize`
|
1 - type const CONST: usize = 1i32;
1 + type const CONST: usize = 1usize;
|
thread 'rustc' (2715739) panicked at /rustc-dev/75b9d89c68a4a92758349272aa4e35a8eb7a6708/compiler/rustc_const_eval/src/interpret/operand.rs:387:9:
attempting to project to field at offset 0 with size 8 into immediate with layout TyAndLayout {
ty: i32,
layout: Layout {
size: Size(4 bytes),
align: AbiAlign {
abi: Align(4 bytes),
},
backend_repr: Scalar(
Initialized {
value: Int(
I32,
true,
),
valid_range: 0..=4294967295,
},
),
fields: Primitive,
largest_niche: None,
uninhabited: false,
variants: Single {
index: 0,
},
max_repr_align: None,
unadjusted_abi_align: Align(4 bytes),
randomization_seed: 18446462603027873795,
},
}
stack backtrace:
0: 0x7f6ae47c8a8b - <<std[2d1308c35637467a]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[59b75ac17867df2]::fmt::Display>::fmt
1: 0x7f6ae4e110e0 - core[59b75ac17867df2]::fmt::write
2: 0x7f6ae47dfd06 - <std[2d1308c35637467a]::sys::stdio::unix::Stderr as std[2d1308c35637467a]::io::Write>::write_fmt
3: 0x7f6ae479eb38 - std[2d1308c35637467a]::panicking::default_hook::{closure#0}
4: 0x7f6ae47bbef3 - std[2d1308c35637467a]::panicking::default_hook
5: 0x7f6ae378b61f - std[2d1308c35637467a]::panicking::update_hook::<alloc[b4f9b4e27dddabf5]::boxed::Box<rustc_driver_impl[e294da4906e6dc96]::install_ice_hook::{closure#1}>>::{closure#0}
6: 0x7f6ae47bc1d2 - std[2d1308c35637467a]::panicking::panic_with_hook
7: 0x7f6ae479ebf8 - std[2d1308c35637467a]::panicking::panic_handler::{closure#0}
8: 0x7f6ae4793169 - std[2d1308c35637467a]::sys::backtrace::__rust_end_short_backtrace::<std[2d1308c35637467a]::panicking::panic_handler::{closure#0}, !>
9: 0x7f6ae47a065d - __rustc[67c75c4a30db75ac]::rust_begin_unwind
10: 0x7f6ae147e82c - core[59b75ac17867df2]::panicking::panic_fmt
11: 0x7f6ae6c82e20 - <rustc_const_eval[e33c05d851da09de]::interpret::operand::ImmTy>::offset_::<rustc_const_eval[e33c05d851da09de]::interpret::eval_context::InterpCx<rustc_const_eval[e33c05d851da09de]::const_eval::dummy_machine::DummyMachine>>.cold
12: 0x7f6ae5648f70 - <rustc_mir_transform[262394a36fc8ebcd]::known_panics_lint::ConstPropagator as rustc_middle[8dc6b2453706b250]::mir::visit::Visitor>::visit_assign
13: 0x7f6ae5642cc5 - <rustc_mir_transform[262394a36fc8ebcd]::known_panics_lint::ConstPropagator as rustc_middle[8dc6b2453706b250]::mir::visit::Visitor>::visit_body
14: 0x7f6ae56401b2 - <rustc_mir_transform[262394a36fc8ebcd]::known_panics_lint::KnownPanicsLint as rustc_mir_transform[262394a36fc8ebcd]::pass_manager::MirLint>::run_lint
15: 0x7f6ae4e0c94c - rustc_mir_transform[262394a36fc8ebcd]::run_analysis_to_runtime_passes
16: 0x7f6ae5b89203 - rustc_mir_transform[262394a36fc8ebcd]::mir_drops_elaborated_and_const_checked
17: 0x7f6ae5b88c21 - rustc_query_impl[ae97bbfaef5cf938]::query_impl::mir_drops_elaborated_and_const_checked::invoke_provider_fn::__rust_begin_short_backtrace
18: 0x7f6ae58618fe - rustc_query_impl[ae97bbfaef5cf938]::execution::try_execute_query::<rustc_data_structures[7f8c3356a540b3ba]::vec_cache::VecCache<rustc_span[d1cb45c887057336]::def_id::LocalDefId, rustc_middle[8dc6b2453706b250]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[8dc6b2453706b250]::dep_graph::graph::DepNodeIndex>, {rustc_query_impl[ae97bbfaef5cf938]::QueryFlags { is_anon: false, is_depth_limit: false, is_feedable: false }}, false>
19: 0x7f6ae5861289 - rustc_query_impl[ae97bbfaef5cf938]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
20: 0x7f6ae585f56a - <rustc_middle[8dc6b2453706b250]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface[14454cc610ccaaa5]::passes::run_required_analyses::{closure#1}::{closure#0}>::{closure#0}
21: 0x7f6ae585e96c - rustc_interface[14454cc610ccaaa5]::passes::analysis
22: 0x7f6ae608b999 - rustc_query_impl[ae97bbfaef5cf938]::execution::try_execute_query::<rustc_middle[8dc6b2453706b250]::query::caches::SingleCache<rustc_middle[8dc6b2453706b250]::query::erase::ErasedData<[u8; 0usize]>>, {rustc_query_impl[ae97bbfaef5cf938]::QueryFlags { is_anon: false, is_depth_limit: false, is_feedable: false }}, false>
23: 0x7f6ae608b6d4 - rustc_query_impl[ae97bbfaef5cf938]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
24: 0x7f6ae6124867 - <rustc_interface[14454cc610ccaaa5]::passes::create_and_enter_global_ctxt<core[59b75ac17867df2]::option::Option<rustc_interface[14454cc610ccaaa5]::queries::Linker>, rustc_driver_impl[e294da4906e6dc96]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[59b75ac17867df2]::ops::function::FnOnce<(&rustc_session[df95067a6cb94e78]::session::Session, rustc_middle[8dc6b2453706b250]::ty::context::CurrentGcx, alloc[b4f9b4e27dddabf5]::sync::Arc<rustc_data_structures[7f8c3356a540b3ba]::jobserver::Proxy>, &std[2d1308c35637467a]::sync::once_lock::OnceLock<rustc_middle[8dc6b2453706b250]::ty::context::GlobalCtxt>, &rustc_data_structures[7f8c3356a540b3ba]::sync::worker_local::WorkerLocal<rustc_middle[8dc6b2453706b250]::arena::Arena>, &rustc_data_structures[7f8c3356a540b3ba]::sync::worker_local::WorkerLocal<rustc_hir[2ea25bfe832ed195]::Arena>, rustc_driver_impl[e294da4906e6dc96]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
25: 0x7f6ae6069337 - rustc_interface[14454cc610ccaaa5]::interface::run_compiler::<(), rustc_driver_impl[e294da4906e6dc96]::run_compiler::{closure#0}>::{closure#1}
26: 0x7f6ae604c5fe - std[2d1308c35637467a]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[14454cc610ccaaa5]::util::run_in_thread_with_globals<rustc_interface[14454cc610ccaaa5]::util::run_in_thread_pool_with_globals<rustc_interface[14454cc610ccaaa5]::interface::run_compiler<(), rustc_driver_impl[e294da4906e6dc96]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
27: 0x7f6ae604cce0 - <std[2d1308c35637467a]::thread::lifecycle::spawn_unchecked<rustc_interface[14454cc610ccaaa5]::util::run_in_thread_with_globals<rustc_interface[14454cc610ccaaa5]::util::run_in_thread_pool_with_globals<rustc_interface[14454cc610ccaaa5]::interface::run_compiler<(), rustc_driver_impl[e294da4906e6dc96]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[59b75ac17867df2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
28: 0x7f6ae604db6c - <std[2d1308c35637467a]::sys::thread::unix::Thread>::new::thread_start
29: 0x7f6ae78d698b - <unknown>
30: 0x7f6ae795aa0c - <unknown>
31: 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 1.95.0-nightly (75b9d89c6 2026-02-15) running on x86_64-unknown-linux-gnu
query stack during panic:
#0 [mir_drops_elaborated_and_const_checked] elaborating drops for `uses_const`
#1 [analysis] running analysis passes on crate `mvce`
end of query stack
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0308, E0601, E0658.
For more information about an error, try `rustc --explain E0308`.