error: associated constant in `impl` without body
--> /tmp/icemaker_global_tempdir.c0PRprlesLQf/rustc_testrunner_tmpdir_reporting.TIx9DK3gKKQA/mvce.rs:4:5
|
4 | const SIZE: usize;
| ^^^^^^^^^^^^^^^^^-
| |
| help: provide a definition for the constant: `= <expr>;`
error: associated function in `impl` without body
--> /tmp/icemaker_global_tempdir.c0PRprlesLQf/rustc_testrunner_tmpdir_reporting.TIx9DK3gKKQA/mvce.rs:6:5
|
6 | fn to_bytes(&self) -> [u8; Self::SIZE];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| help: provide a definition for the function: `{ <body> }`
error: `generic_const_args` requires `min_generic_const_args` to be enabled
--> <crate attribute>:1:12
|
1 | #![feature(generic_const_args)]
| ^^^^^^^^^^^^^^^^^^
|
= help: enable all of these features
error: `macroless_generic_const_args` requires `min_generic_const_args` to be enabled
--> <crate attribute>:1:12
|
1 | #![feature(macroless_generic_const_args)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: enable all of these features
warning: the feature `inherent_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
--> <crate attribute>:1:12
|
1 | #![feature(inherent_associated_types)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
= note: `#[warn(incomplete_features)]` on by default
warning: the feature `macroless_generic_const_args` is incomplete and may not be safe to use and/or cause compiler crashes
--> <crate attribute>:1:12
|
1 | #![feature(macroless_generic_const_args)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #159006 <https://github.com/rust-lang/rust/issues/159006> for more information
warning: the feature `generic_const_args` is incomplete and may not be safe to use and/or cause compiler crashes
--> <crate attribute>:1:12
|
1 | #![feature(generic_const_args)]
| ^^^^^^^^^^^^^^^^^^
|
= note: see issue #151972 <https://github.com/rust-lang/rust/issues/151972> for more information
error[E0601]: `main` function not found in crate `mvce`
--> /tmp/icemaker_global_tempdir.c0PRprlesLQf/rustc_testrunner_tmpdir_reporting.TIx9DK3gKKQA/mvce.rs:7:2
|
7 | } // ok
| ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.c0PRprlesLQf/rustc_testrunner_tmpdir_reporting.TIx9DK3gKKQA/mvce.rs`
error: internal compiler error: /rustc-dev/a4330234a776684c36428d001721d0320d24dd77/compiler/rustc_trait_selection/src/traits/wf.rs:1103:68: This ought to be unreachable, the entrypoints of WF should still have InherentSelf-form alias consts.
thread 'rustc' (3760825) panicked at /rustc-dev/a4330234a776684c36428d001721d0320d24dd77/compiler/rustc_trait_selection/src/traits/wf.rs:1103:68:
Box<dyn Any>
stack backtrace:
0: 0x7fe00ca87576 - <<std[30cbc90d73eb2f7]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[37d23c544a63de81]::fmt::Display>::fmt
1: 0x7fe00d01138f - core[37d23c544a63de81]::fmt::write
2: 0x7fe00ca9c64c - <std[30cbc90d73eb2f7]::sys::stdio::unix::Stderr as core[37d23c544a63de81]::io::write::Write>::write_fmt
3: 0x7fe00ca59e4a - std[30cbc90d73eb2f7]::panicking::default_hook::{closure#0}
4: 0x7fe00ca7b8a3 - std[30cbc90d73eb2f7]::panicking::default_hook
5: 0x7fe00b9f1d8f - std[30cbc90d73eb2f7]::panicking::update_hook::<alloc[1ae459ecdd033a44]::boxed::Box<rustc_driver_impl[42633c3e3ce72fef]::install_ice_hook::{closure#1}>>::{closure#0}
6: 0x7fe00ca7bd42 - std[30cbc90d73eb2f7]::panicking::panic_with_hook
7: 0x7fe00ba20324 - std[30cbc90d73eb2f7]::panicking::begin_panic::<rustc_errors[9274a714df388628]::ExplicitBug>::{closure#0}
8: 0x7fe00ba190d6 - std[30cbc90d73eb2f7]::sys::backtrace::__rust_end_short_backtrace::<std[30cbc90d73eb2f7]::panicking::begin_panic<rustc_errors[9274a714df388628]::ExplicitBug>::{closure#0}, !>
9: 0x7fe00ba18e0b - std[30cbc90d73eb2f7]::panicking::begin_panic::<rustc_errors[9274a714df388628]::ExplicitBug>
10: 0x7fe00ba2bd71 - <rustc_errors[9274a714df388628]::diagnostic::BugAbort as rustc_errors[9274a714df388628]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
11: 0x7fe00bfb8d59 - rustc_middle[a86b7b2986aebea0]::util::bug::opt_span_bug_fmt::<rustc_span[b1cb78db3bb7e75b]::span_encoding::Span>::{closure#0}
12: 0x7fe00bfb9152 - rustc_middle[a86b7b2986aebea0]::ty::context::tls::with_opt::<rustc_middle[a86b7b2986aebea0]::util::bug::opt_span_bug_fmt<rustc_span[b1cb78db3bb7e75b]::span_encoding::Span>::{closure#0}, !>::{closure#0}
13: 0x7fe00bfa3f70 - rustc_middle[a86b7b2986aebea0]::ty::context::tls::with_context_opt::<rustc_middle[a86b7b2986aebea0]::ty::context::tls::with_opt<rustc_middle[a86b7b2986aebea0]::util::bug::opt_span_bug_fmt<rustc_span[b1cb78db3bb7e75b]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
14: 0x7fe008c1e6f4 - rustc_middle[a86b7b2986aebea0]::util::bug::bug_fmt
15: 0x7fe00d2bba3b - <rustc_trait_selection[dd61d12ef2e98b62]::traits::wf::WfPredicates as rustc_type_ir[740cb680109dbe18]::visit::TypeVisitor<rustc_middle[a86b7b2986aebea0]::ty::context::TyCtxt>>::visit_const
16: 0x7fe00d2b3b83 - <rustc_trait_selection[dd61d12ef2e98b62]::traits::wf::WfPredicates as rustc_type_ir[740cb680109dbe18]::visit::TypeVisitor<rustc_middle[a86b7b2986aebea0]::ty::context::TyCtxt>>::visit_ty
17: 0x7fe00de2ba1e - <rustc_next_trait_solver[1853f23884fbb7e4]::solve::eval_ctxt::EvalCtxt<rustc_trait_selection[dd61d12ef2e98b62]::solve::delegate::SolverDelegate, rustc_middle[a86b7b2986aebea0]::ty::context::TyCtxt>>::evaluate_goal_no_fast_paths
18: 0x7fe00de2116c - <rustc_trait_selection[dd61d12ef2e98b62]::traits::engine::ObligationCtxt<rustc_trait_selection[dd61d12ef2e98b62]::traits::FulfillmentError>>::evaluate_obligations_error_on_ambiguity
19: 0x7fe00d84175a - rustc_hir_analysis[e3348fb73159a1b9]::check::wfcheck::enter_wf_checking_ctxt::<rustc_hir_analysis[e3348fb73159a1b9]::check::wfcheck::check_associated_item::{closure#0}>
20: 0x7fe00e221a98 - rustc_hir_analysis[e3348fb73159a1b9]::check::check::check_item_type
21: 0x7fe00e21dff2 - rustc_hir_analysis[e3348fb73159a1b9]::check::wfcheck::check_well_formed
22: 0x7fe00e21dfd3 - rustc_query_impl[97c88ea65335a4b0]::query_vtables::check_well_formed::invoke_provider_fn::__rust_begin_short_backtrace
23: 0x7fe00e21d5fb - rustc_query_impl[97c88ea65335a4b0]::execution::try_execute_query::<rustc_data_structures[2f5d70850e22934]::vec_cache::VecCache<rustc_span[b1cb78db3bb7e75b]::def_id::LocalDefId, rustc_middle[a86b7b2986aebea0]::query::erase::ErasedData<[u8; 1usize]>, rustc_middle[a86b7b2986aebea0]::dep_graph::graph::DepNodeIndex>, false>
24: 0x7fe00e21d395 - rustc_query_impl[97c88ea65335a4b0]::query_vtables::check_well_formed::execute_query_non_incr::__rust_end_short_backtrace
25: 0x7fe00e21a8a7 - rustc_hir_analysis[e3348fb73159a1b9]::check::wfcheck::check_type_wf
26: 0x7fe00e21a711 - rustc_query_impl[97c88ea65335a4b0]::query_vtables::check_type_wf::invoke_provider_fn::__rust_begin_short_backtrace
27: 0x7fe00e2038c9 - rustc_query_impl[97c88ea65335a4b0]::execution::try_execute_query::<rustc_middle[a86b7b2986aebea0]::query::caches::SingleCache<rustc_middle[a86b7b2986aebea0]::query::erase::ErasedData<[u8; 1usize]>>, false>
28: 0x7fe00e2036ad - rustc_query_impl[97c88ea65335a4b0]::query_vtables::check_type_wf::execute_query_non_incr::__rust_end_short_backtrace
29: 0x7fe00d827fa4 - rustc_hir_analysis[e3348fb73159a1b9]::check_crate
30: 0x7fe00dd8003c - rustc_interface[a3585332d3a3ff1e]::passes::analysis
31: 0x7fe00e2051ca - rustc_query_impl[97c88ea65335a4b0]::execution::try_execute_query::<rustc_middle[a86b7b2986aebea0]::query::caches::SingleCache<rustc_middle[a86b7b2986aebea0]::query::erase::ErasedData<[u8; 0usize]>>, false>
32: 0x7fe00e204f6b - rustc_query_impl[97c88ea65335a4b0]::query_vtables::analysis::execute_query_non_incr::__rust_end_short_backtrace
33: 0x7fe00e35a659 - rustc_interface[a3585332d3a3ff1e]::interface::run_compiler::<(), rustc_driver_impl[42633c3e3ce72fef]::run_compiler::{closure#0}>::{closure#2}
34: 0x7fe00e3ad7c2 - std[30cbc90d73eb2f7]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[a3585332d3a3ff1e]::util::run_in_thread_with_globals<rustc_interface[a3585332d3a3ff1e]::util::run_in_thread_pool_with_globals<rustc_interface[a3585332d3a3ff1e]::interface::run_compiler<(), rustc_driver_impl[42633c3e3ce72fef]::run_compiler::{closure#0}>::{closure#2}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
35: 0x7fe00e3ad56d - <std[30cbc90d73eb2f7]::thread::lifecycle::spawn_unchecked<rustc_interface[a3585332d3a3ff1e]::util::run_in_thread_with_globals<rustc_interface[a3585332d3a3ff1e]::util::run_in_thread_pool_with_globals<rustc_interface[a3585332d3a3ff1e]::interface::run_compiler<(), rustc_driver_impl[42633c3e3ce72fef]::run_compiler::{closure#0}>::{closure#2}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[37d23c544a63de81]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
36: 0x7fe00e3b5ec7 - <std[30cbc90d73eb2f7]::sys::thread::unix::Thread>::new::thread_start
37: 0x7fe0076980a2 - <unknown>
38: 0x7fe00772080c - <unknown>
39: 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 1.100.0-nightly (a4330234a 2026-09-01) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z crate-attr=feature(inherent_associated_types) -Z crate-attr=feature(macroless_generic_const_args) -Z crate-attr=feature(generic_const_args) -Z dump-mir-dir=dir
query stack during panic:
#0 [check_well_formed] checking that `<impl at /tmp/icemaker_global_tempdir.c0PRprlesLQf/rustc_testrunner_tmpdir_reporting.TIx9DK3gKKQA/mvce.rs:3:1: 3:31>::to_bytes` is well-formed
#1 [check_type_wf] checking that types are well-formed
#2 [analysis] running analysis passes on crate `mvce`
end of query stack
error: aborting due to 6 previous errors; 3 warnings emitted
For more information about this error, try `rustc --explain E0601`.
auto-reduced (treereduce-rust):
original:
Version information
Possibly related line of code:
rust/compiler/rustc_trait_selection/src/traits/wf.rs
Lines 1097 to 1109 in a433023
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zcrate-attr=feature(inherent_associated_types) -Zcrate-attr=feature(macroless_generic_const_args) -Zcrate-attr=feature(generic_const_args)Program output
@rustbot label +F-inherent_associated_types +F-macroless_generic_const_args +F-generic_const_args