Open
Description
snippet:
#![feature(generic_const_exprs)]
fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;Version information
rustc 1.88.0-nightly (1bc56185e 2025-04-11)
binary: rustc
commit-hash: 1bc56185ee257ed829a0aea7abdc3b03c5fed887
commit-date: 2025-04-11
host: x86_64-unknown-linux-gnu
release: 1.88.0-nightly
LLVM version: 20.1.2
Possibly related line of code:
rust/compiler/rustc_borrowck/src/universal_regions.rs
Lines 918 to 930 in 1bc5618
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc
Program output
error: free function without a body
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:1
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| help: provide a definition for the function: `{ <body> }`
error[E0412]: cannot find type `c` in this scope
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:54
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| - ^
| |
| similarly named type parameter `U` defined here
|
help: a type parameter with a similar name exists
|
2 - fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
2 + fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[U; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
|
help: you might be missing a type parameter
|
2 | fn b<'a, U: 'a, c>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| +++
warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:1:12
|
1 | #![feature(generic_const_exprs)]
| ^^^^^^^^^^^^^^^^^^^
|
= note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
= note: `#[warn(incomplete_features)]` on by default
warning: unnecessary braces around const expression
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:57
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^^ ^^
|
= note: `#[warn(unused_braces)]` on by default
help: remove these braces
|
2 - fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
2 + fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; [0; (|d: &'a u8| 0, 0).1]]> + 'a>;
|
error[E0601]: `main` function not found in crate `mvce`
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:95
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs`
warning: trait objects without an explicit `dyn` are deprecated
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:22
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
= note: `#[warn(bare_trait_objects)]` on by default
help: if this is a dyn-compatible trait, use `dyn`
|
2 | fn b<'a, U: 'a>() -> dyn IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| +++
error[E0107]: trait takes 0 generic arguments but 1 generic argument was supplied
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:22
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^^^^^^^^^^^^------------------------------------------------------------ help: remove the unnecessary generics
| |
| expected 0 generic arguments
|
note: trait defined here, with 0 generic parameters
--> /home/matthias/.rustup/toolchains/master/lib/rustlib/src/rust/library/core/src/iter/traits/collect.rs:285:11
|
285 | pub trait IntoIterator {
| ^^^^^^^^^^^^
error[E0191]: the value of the associated types `Item` and `IntoIter` in `IntoIterator` must be specified
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:22
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: specify the associated types: `IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a, Item = Type, IntoIter = Type>`
error[E0107]: trait takes 0 generic arguments but 1 generic argument was supplied
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:40
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^^^^^^^^^^^^------------------------------------ help: remove the unnecessary generics
| |
| expected 0 generic arguments
|
note: trait defined here, with 0 generic parameters
--> /home/matthias/.rustup/toolchains/master/lib/rustlib/src/rust/library/core/src/iter/traits/collect.rs:285:11
|
285 | pub trait IntoIterator {
| ^^^^^^^^^^^^
error: overly complex generic constant
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:63
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^^^^^^^^^^^^^^^^^^^^ field access is not supported in generic constants
|
= help: consider moving this anonymous constant into a `const` function
= note: this operation may be supported in the future
warning: unused variable: `d`
--> /tmp/icemaker_global_tempdir.xjQnUINnYRkJ/rustc_testrunner_tmpdir_reporting.TkPHgaMoSCBr/mvce.rs:2:65
|
2 | fn b<'a, U: 'a>() -> IntoIterator<impl IntoIterator<[c; { [0; (|d: &'a u8| 0, 0).1] }]> + 'a>;
| ^ help: if this is intentional, prefix it with an underscore: `_d`
|
= note: `#[warn(unused_variables)]` on by default
error: internal compiler error: compiler/rustc_borrowck/src/universal_regions.rs:924:36: cannot convert `'a/#2` to a region vid
thread 'rustc' panicked at compiler/rustc_borrowck/src/universal_regions.rs:924:36:
Box<dyn Any>
stack backtrace:
0: 0x7b7b7dcae1d3 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::ha1a0d406ae5318b3
1: 0x7b7b7e406091 - core::fmt::write::h0d5e9eae7d226967
2: 0x7b7b7f831c91 - std::io::Write::write_fmt::h92dc03d2f90355cb
3: 0x7b7b7dcae032 - std::sys::backtrace::BacktraceLock::print::hefb500e2252e3de3
4: 0x7b7b7dcb1b1a - std::panicking::default_hook::{{closure}}::hc8f5fcb1e1b811e8
5: 0x7b7b7dcb169f - std::panicking::default_hook::hd1ef999683fd0f91
6: 0x7b7b7cd0de03 - std[9ae281d1a9b28dc6]::panicking::update_hook::<alloc[bd1e734024810420]::boxed::Box<rustc_driver_impl[cd9d13f10141f85d]::install_ice_hook::{closure#1}>>::{closure#0}
7: 0x7b7b7dcb2393 - std::panicking::rust_panic_with_hook::hf78f6e108bdf2f89
8: 0x7b7b7cd4cb41 - std[9ae281d1a9b28dc6]::panicking::begin_panic::<rustc_errors[6913606b7a0e40fd]::ExplicitBug>::{closure#0}
9: 0x7b7b7cd40a56 - std[9ae281d1a9b28dc6]::sys::backtrace::__rust_end_short_backtrace::<std[9ae281d1a9b28dc6]::panicking::begin_panic<rustc_errors[6913606b7a0e40fd]::ExplicitBug>::{closure#0}, !>
10: 0x7b7b7cd40837 - std[9ae281d1a9b28dc6]::panicking::begin_panic::<rustc_errors[6913606b7a0e40fd]::ExplicitBug>
11: 0x7b7b7cd56f11 - <rustc_errors[6913606b7a0e40fd]::diagnostic::BugAbort as rustc_errors[6913606b7a0e40fd]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
12: 0x7b7b7d3a824a - rustc_middle[cd1364ce0c8092fc]::util::bug::opt_span_bug_fmt::<rustc_span[92872e93c8f40263]::span_encoding::Span>::{closure#0}
13: 0x7b7b7d38310a - rustc_middle[cd1364ce0c8092fc]::ty::context::tls::with_opt::<rustc_middle[cd1364ce0c8092fc]::util::bug::opt_span_bug_fmt<rustc_span[92872e93c8f40263]::span_encoding::Span>::{closure#0}, !>::{closure#0}
14: 0x7b7b7d382f7b - rustc_middle[cd1364ce0c8092fc]::ty::context::tls::with_context_opt::<rustc_middle[cd1364ce0c8092fc]::ty::context::tls::with_opt<rustc_middle[cd1364ce0c8092fc]::util::bug::opt_span_bug_fmt<rustc_span[92872e93c8f40263]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
15: 0x7b7b7a6864b0 - rustc_middle[cd1364ce0c8092fc]::util::bug::bug_fmt
16: 0x7b7b7e5a2ee9 - <rustc_borrowck[727efc1bea3736b9]::type_check::TypeChecker>::push_region_constraints
17: 0x7b7b7f4695c0 - <rustc_borrowck[727efc1bea3736b9]::type_check::TypeChecker>::ascribe_user_type_skip_wf
18: 0x7b7b7f6b0f9b - rustc_borrowck[727efc1bea3736b9]::do_mir_borrowck
19: 0x7b7b7eab9a6b - <rustc_borrowck[727efc1bea3736b9]::root_cx::BorrowCheckRootCtxt>::get_or_insert_nested
20: 0x7b7b7eab9d45 - <rustc_borrowck[727efc1bea3736b9]::type_check::TypeChecker>::prove_closure_bounds
21: 0x7b7b7b5d3353 - <rustc_borrowck[727efc1bea3736b9]::type_check::TypeChecker as rustc_middle[cd1364ce0c8092fc]::mir::visit::Visitor>::visit_rvalue
22: 0x7b7b7f851761 - <rustc_borrowck[727efc1bea3736b9]::type_check::TypeChecker as rustc_middle[cd1364ce0c8092fc]::mir::visit::Visitor>::visit_body
23: 0x7b7b7f6af5b0 - rustc_borrowck[727efc1bea3736b9]::do_mir_borrowck
24: 0x7b7b7f69bdd1 - rustc_borrowck[727efc1bea3736b9]::mir_borrowck
25: 0x7b7b7f69bc79 - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>>
26: 0x7b7b7e65d3ec - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_data_structures[6b6113a6c31505b]::vec_cache::VecCache<rustc_span[92872e93c8f40263]::def_id::LocalDefId, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[c372e7878a5d5bad]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
27: 0x7b7b7e65cd8b - rustc_query_impl[5967f2ee2602ee92]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
28: 0x7b7b7e66def8 - rustc_mir_transform[b6119c96af6957c0]::mir_drops_elaborated_and_const_checked
29: 0x7b7b7e66d5a3 - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>>
30: 0x7b7b7e65d3ec - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_data_structures[6b6113a6c31505b]::vec_cache::VecCache<rustc_span[92872e93c8f40263]::def_id::LocalDefId, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[c372e7878a5d5bad]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
31: 0x7b7b7e65cccf - rustc_query_impl[5967f2ee2602ee92]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
32: 0x7b7b7eefd818 - rustc_mir_transform[b6119c96af6957c0]::mir_for_ctfe
33: 0x7b7b7eefd64d - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::mir_for_ctfe::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>>
34: 0x7b7b7e78c96f - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_query_system[c372e7878a5d5bad]::query::caches::DefIdCache<rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
35: 0x7b7b7f13c79d - rustc_query_impl[5967f2ee2602ee92]::query_impl::mir_for_ctfe::get_query_non_incr::__rust_end_short_backtrace
36: 0x7b7b7f13c8cd - <rustc_const_eval[57ee52d6cb9a0a3b]::interpret::eval_context::InterpCx<rustc_const_eval[57ee52d6cb9a0a3b]::const_eval::machine::CompileTimeMachine>>::load_mir
37: 0x7b7b7f13d721 - rustc_const_eval[57ee52d6cb9a0a3b]::const_eval::eval_queries::eval_to_allocation_raw_provider
38: 0x7b7b7f13cffe - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 24usize]>>
39: 0x7b7b7f12cdc2 - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_query_system[c372e7878a5d5bad]::query::caches::DefaultCache<rustc_middle[cd1364ce0c8092fc]::ty::PseudoCanonicalInput<rustc_middle[cd1364ce0c8092fc]::mir::interpret::GlobalId>, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
40: 0x7b7b7f12c974 - rustc_query_impl[5967f2ee2602ee92]::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace
41: 0x7b7b7f11d0d6 - rustc_const_eval[57ee52d6cb9a0a3b]::const_eval::valtrees::eval_to_valtree
42: 0x7b7b7f11ce94 - <rustc_const_eval[57ee52d6cb9a0a3b]::provide::{closure#0} as core[22c124abaa691b7d]::ops::function::FnOnce<(rustc_middle[cd1364ce0c8092fc]::ty::context::TyCtxt, rustc_middle[cd1364ce0c8092fc]::ty::PseudoCanonicalInput<rustc_middle[cd1364ce0c8092fc]::mir::interpret::GlobalId>)>>::call_once
43: 0x7b7b7f11ce3e - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::eval_to_valtree::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 24usize]>>
44: 0x7b7b7f11cdf7 - <rustc_query_impl[5967f2ee2602ee92]::query_impl::eval_to_valtree::dynamic_query::{closure#2} as core[22c124abaa691b7d]::ops::function::FnOnce<(rustc_middle[cd1364ce0c8092fc]::ty::context::TyCtxt, rustc_middle[cd1364ce0c8092fc]::ty::PseudoCanonicalInput<rustc_middle[cd1364ce0c8092fc]::mir::interpret::GlobalId>)>>::call_once
45: 0x7b7b7f12cea5 - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_query_system[c372e7878a5d5bad]::query::caches::DefaultCache<rustc_middle[cd1364ce0c8092fc]::ty::PseudoCanonicalInput<rustc_middle[cd1364ce0c8092fc]::mir::interpret::GlobalId>, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
46: 0x7b7b7f12c886 - rustc_query_impl[5967f2ee2602ee92]::query_impl::eval_to_valtree::get_query_non_incr::__rust_end_short_backtrace
47: 0x7b7b7ef0f7c1 - <rustc_middle[cd1364ce0c8092fc]::ty::context::TyCtxt>::const_eval_global_id_for_typeck
48: 0x7b7b7ef0f336 - <rustc_middle[cd1364ce0c8092fc]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
49: 0x7b7b7ef0edc8 - rustc_trait_selection[319aa020fe5e5e23]::traits::try_evaluate_const
50: 0x7b7b7db50c75 - rustc_trait_selection[319aa020fe5e5e23]::traits::evaluate_const
51: 0x7b7b7e9300cc - <rustc_hir_typeck[9d0763d257897bd3]::fn_ctxt::FnCtxt>::try_structurally_resolve_const
52: 0x7b7b7f06bdd2 - <rustc_hir_typeck[9d0763d257897bd3]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
53: 0x7b7b7f0598f7 - <rustc_hir_typeck[9d0763d257897bd3]::fn_ctxt::FnCtxt>::check_expr_block
54: 0x7b7b7f0645e2 - <rustc_hir_typeck[9d0763d257897bd3]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
55: 0x7b7b7e686c36 - rustc_hir_typeck[9d0763d257897bd3]::typeck_with_inspect::{closure#0}
56: 0x7b7b7e683036 - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>>
57: 0x7b7b7e65d3ec - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_data_structures[6b6113a6c31505b]::vec_cache::VecCache<rustc_span[92872e93c8f40263]::def_id::LocalDefId, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[c372e7878a5d5bad]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
58: 0x7b7b7e65ce4b - rustc_query_impl[5967f2ee2602ee92]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
59: 0x7b7b7e65e548 - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::used_trait_imports::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>>
60: 0x7b7b7e65d3ec - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_data_structures[6b6113a6c31505b]::vec_cache::VecCache<rustc_span[92872e93c8f40263]::def_id::LocalDefId, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[c372e7878a5d5bad]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
61: 0x7b7b7e65cc27 - rustc_query_impl[5967f2ee2602ee92]::query_impl::used_trait_imports::get_query_non_incr::__rust_end_short_backtrace
62: 0x7b7b7e65c8d7 - rustc_hir_analysis[98ab9e600e914c06]::check_unused::check_unused_traits
63: 0x7b7b7e65c7cb - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::check_unused_traits::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 0usize]>>
64: 0x7b7b7f3666fd - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_query_system[c372e7878a5d5bad]::query::caches::SingleCache<rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
65: 0x7b7b7f3664fc - rustc_query_impl[5967f2ee2602ee92]::query_impl::check_unused_traits::get_query_non_incr::__rust_end_short_backtrace
66: 0x7b7b7e65ba27 - rustc_hir_analysis[98ab9e600e914c06]::check_crate
67: 0x7b7b7ee14074 - rustc_interface[df8337fb1d12619b]::passes::run_required_analyses
68: 0x7b7b7f360c5e - rustc_interface[df8337fb1d12619b]::passes::analysis
69: 0x7b7b7f360c33 - rustc_query_impl[5967f2ee2602ee92]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5967f2ee2602ee92]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 0usize]>>
70: 0x7b7b7f3666fd - rustc_query_system[c372e7878a5d5bad]::query::plumbing::try_execute_query::<rustc_query_impl[5967f2ee2602ee92]::DynamicConfig<rustc_query_system[c372e7878a5d5bad]::query::caches::SingleCache<rustc_middle[cd1364ce0c8092fc]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[5967f2ee2602ee92]::plumbing::QueryCtxt, false>
71: 0x7b7b7f3663f8 - rustc_query_impl[5967f2ee2602ee92]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
72: 0x7b7b7f734afc - rustc_interface[df8337fb1d12619b]::passes::create_and_enter_global_ctxt::<core[22c124abaa691b7d]::option::Option<rustc_interface[df8337fb1d12619b]::queries::Linker>, rustc_driver_impl[cd9d13f10141f85d]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
73: 0x7b7b7f5a0c54 - rustc_interface[df8337fb1d12619b]::interface::run_compiler::<(), rustc_driver_impl[cd9d13f10141f85d]::run_compiler::{closure#0}>::{closure#1}
74: 0x7b7b7f3c3268 - std[9ae281d1a9b28dc6]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[df8337fb1d12619b]::util::run_in_thread_with_globals<rustc_interface[df8337fb1d12619b]::util::run_in_thread_pool_with_globals<rustc_interface[df8337fb1d12619b]::interface::run_compiler<(), rustc_driver_impl[cd9d13f10141f85d]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
75: 0x7b7b7f3c3b6b - <<std[9ae281d1a9b28dc6]::thread::Builder>::spawn_unchecked_<rustc_interface[df8337fb1d12619b]::util::run_in_thread_with_globals<rustc_interface[df8337fb1d12619b]::util::run_in_thread_pool_with_globals<rustc_interface[df8337fb1d12619b]::interface::run_compiler<(), rustc_driver_impl[cd9d13f10141f85d]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[22c124abaa691b7d]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
76: 0x7b7b7f3c4f77 - std::sys::pal::unix::thread::Thread::new::thread_start::h4d89dcdfc63a0b38
77: 0x7b7b792a370a - <unknown>
78: 0x7b7b79327aac - <unknown>
79: 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 1.88.0-nightly (1bc56185e 2025-04-11) running on x86_64-unknown-linux-gnu
query stack during panic:
#0 [mir_borrowck] borrow-checking `b::{opaque#0}::{constant#0}::{constant#0}`
#1 [mir_drops_elaborated_and_const_checked] elaborating drops for `b::{opaque#0}::{constant#0}::{constant#0}`
#2 [mir_for_ctfe] caching mir of `b::{opaque#0}::{constant#0}::{constant#0}` for CTFE
#3 [eval_to_allocation_raw] const-evaluating + checking `b::{opaque#0}::{constant#0}::{constant#0}`
#4 [eval_to_valtree] evaluating type-level constant
#5 [typeck] type-checking `b::{opaque#0}::{constant#0}`
#6 [used_trait_imports] finding used_trait_imports `b::{opaque#0}::{constant#0}`
#7 [check_unused_traits] checking unused trait imports in crate
#8 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 8 previous errors; 4 warnings emitted
Some errors have detailed explanations: E0107, E0191, E0412, E0601.
For more information about an error, try `rustc --explain E0107`.
@rustbot label +F-generic_const_exprs
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Category: This is a bug.`#![feature(generic_const_exprs)]`Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Status: This bug is tracked inside the repo by a `known-bug` test.Status: A Minimal Complete and Verifiable Example has been found for this issueRelevant to the compiler team, which will review and decide on the PR/issue.