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ICE: unelided lifetime in signature #142773

@matthiaskrgr

Description

@matthiaskrgr

auto-reduced (treereduce-rust):

//@compile-flags: --crate-type=lib #![feature(min_generic_const_args)] #![feature(inherent_associated_types)] pub struct EntriesBuffer(Box<[[u8; HashesEntry::LEN]; 5]>); pub struct HashesEntry<'a>(&'a [u8]); impl HashesEntry<'_> { pub const LEN: usize = 1; }

original:

pub struct EntriesBuffer(Box<[[u8; HashesEntry::LEN]; 5]>); impl EntriesBuffer { pub fn source(&mut self) -> impl Iterator<Item = &mut [u8; HashesEntry::LEN]> { self.0.base_transform() } } pub struct HashesEntry<'a>(&'a [u8]); impl HashesEntry<'_> { pub const LEN: usize = 1; }

Version information

rustc 1.89.0-nightly (5b74275f8 2025-06-20) binary: rustc commit-hash: 5b74275f89b6041bf2e9dc2abcf332e206d4cfca commit-date: 2025-06-20 host: x86_64-unknown-linux-gnu release: 1.89.0-nightly LLVM version: 20.1.7 

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zcrate-attr=feature(min_generic_const_args) -Zcrate-attr=feature(inherent_associated_types) --crate-type=lib

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: 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 warning: field `0` is never read --> /tmp/icemaker_global_tempdir.bd06BD1BQYEr/rustc_testrunner_tmpdir_reporting.HgvjzxSZNUnf/mvce.rs:3:28 | 3 | pub struct HashesEntry<'a>(&'a [u8]); | ----------- ^^^^^^^^ | | | field in this struct | = help: consider removing this field = note: `#[warn(dead_code)]` on by default warning: 3 warnings emitted note: no errors encountered even though delayed bugs were created note: those delayed bugs will now be shown as internal compiler errors error: internal compiler error: unelided lifetime in signature --> /tmp/icemaker_global_tempdir.bd06BD1BQYEr/rustc_testrunner_tmpdir_reporting.HgvjzxSZNUnf/mvce.rs:1:36 | 1 | pub struct EntriesBuffer(Box<[[u8; HashesEntry::LEN]; 5]>); | ^^^^^^^^^^^ | note: delayed at compiler/rustc_hir_analysis/src/collect.rs:343:13 0: <rustc_errors::DiagCtxtInner>::emit_diagnostic 1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic 2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee 3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, &str> 4: <rustc_hir_analysis::collect::ItemCtxt as rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::re_infer 5: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_resolved_ty_path 6: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_ty 7: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_const_arg 8: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_ty 9: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_ty 10: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_resolved_ty_path 11: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_ty 12: rustc_hir_analysis::collect::type_of::type_of 13: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>> 14: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false> 15: rustc_query_impl::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace 16: rustc_hir_analysis::outlives::inferred_outlives_crate 17: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::inferred_outlives_crate::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>> 18: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false> 19: rustc_query_impl::query_impl::inferred_outlives_crate::get_query_non_incr::__rust_end_short_backtrace 20: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::inferred_outlives_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>> 21: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false> 22: rustc_query_impl::query_impl::inferred_outlives_of::get_query_non_incr::__rust_end_short_backtrace 23: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 24]>> 24: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false> 25: rustc_query_impl::query_impl::predicates_of::get_query_non_incr::__rust_end_short_backtrace 26: rustc_hir_analysis::check::wfcheck::check_item 27: rustc_hir_analysis::check::wfcheck::check_well_formed 28: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>> 29: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 1]>, rustc_query_system::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false> 30: rustc_query_impl::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace 31: rustc_hir_analysis::check::wfcheck::check_type_wf 32: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>> 33: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false> 34: rustc_query_impl::query_impl::check_type_wf::get_query_non_incr::__rust_end_short_backtrace 35: rustc_hir_analysis::check_crate 36: rustc_interface::passes::analysis 37: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>> 38: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false> 39: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 40: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0} 41: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1} 42: std::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> 43: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 44: std::sys::pal::unix::thread::Thread::new::thread_start 45: <unknown> 46: <unknown> --> /tmp/icemaker_global_tempdir.bd06BD1BQYEr/rustc_testrunner_tmpdir_reporting.HgvjzxSZNUnf/mvce.rs:1:36 | 1 | pub struct EntriesBuffer(Box<[[u8; HashesEntry::LEN]; 5]>); | ^^^^^^^^^^^ 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 1.89.0-nightly (5b74275f8 2025-06-20) running on x86_64-unknown-linux-gnu note: compiler flags: -Z crate-attr=feature(min_generic_const_args) -Z crate-attr=feature(inherent_associated_types) --crate-type lib -Z dump-mir-dir=dir query stack during panic: end of query stack 

@rustbot label +F-min_generic_const_args +F-inherent_associated_types

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    C-bugCategory: This is a bug.F-inherent_associated_types`#![feature(inherent_associated_types)]`F-min_generic_const_args`#![feature(min_generic_const_args)]`I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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