Repository: rust
Issue: ICE: `error: internal compiler error[E0277]: the trait bound 'str: const Deref' is not satisfied`
Labels: A-diagnostics,I-ICE,T-compiler,C-bug,F-const_trait_impl,S-bug-has-test

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[31mICE[0m: Rustc ./a.rs '-Zcrate-attr=feature(const_trait_impl) -ooutputfile -Zdump-mir-dir=dir' 'error: internal compiler error[E0277]: the trait bound `str: const Deref` is not satisfied', 'error: internal compiler error[E0277]: the trait bound `str: const Deref` is not satisfied'
File: /tmp/im/a.rs
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auto-reduced (treereduce-rust):
````rust
#![feature(const_trait_impl)]
const _: fn(&String) = |s| {
    &*s as &str;
};

fn main() {}

````

original:
````rust
//@ check-pass

const _: fn(&String) = |s| { &*s as &str; };

fn main() {
        println!("hi");
    }

````

Version information
````
rustc 1.86.0-nightly (fb546ee09 2025-01-07)
binary: rustc
commit-hash: fb546ee09b226bc4dd4b712d35a372d923c4fa54
commit-date: 2025-01-07
host: x86_64-unknown-linux-gnu
release: 1.86.0-nightly
LLVM version: 19.1.6

````



Command:
`/home/matthias/.rustup/toolchains/master/bin/rustc -Zcrate-attr=feature(const_trait_impl)`

<details><summary><strong>Program output</strong></summary>
<p>

```
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[E0277]: the trait bound `str: const Deref` is not satisfied
 --> /tmp/icemaker_global_tempdir.anmGc5oi45fj/rustc_testrunner_tmpdir_reporting.YXjbcW9xAirT/mvce.rs:2:5
  |
2 |     &*s as &str;
  |     ^^^
  |
note: delayed at compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs:773:24
         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_trait_selection::error_reporting::TypeErrCtxt>::report_selection_error
         4: <rustc_trait_selection::error_reporting::TypeErrCtxt>::report_fulfillment_error
         5: <rustc_trait_selection::error_reporting::TypeErrCtxt>::report_fulfillment_errors
         6: rustc_hir_typeck::typeck_with_fallback::{closure#0}
         7: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
         8: 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; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         9: rustc_query_impl::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
        10: rustc_hir_analysis::check::check::check_item_type
        11: rustc_hir_analysis::check::wfcheck::check_well_formed
        12: 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]>>
        13: 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>
        14: rustc_query_impl::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
        15: rustc_hir_analysis::check::wfcheck::check_mod_type_wf
        16: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        17: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalModDefId, rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        18: rustc_query_impl::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
        19: rustc_hir_analysis::check_crate
        20: rustc_interface::passes::run_required_analyses
        21: rustc_interface::passes::analysis
        22: 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]>>
        23: 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>
        24: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        25: 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}
        26: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
        27: 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}, ()>
        28: <<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}
        29: std::sys::pal::unix::thread::Thread::new::thread_start
        30: <unknown>
        31: <unknown>
 --> /tmp/icemaker_global_tempdir.anmGc5oi45fj/rustc_testrunner_tmpdir_reporting.YXjbcW9xAirT/mvce.rs:2:5
  |
2 |     &*s as &str;
  |     ^^^

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 1.86.0-nightly (fb546ee09 2025-01-07) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z crate-attr=feature(const_trait_impl) -Z dump-mir-dir=dir

query stack during panic:
end of query stack

```

</p>
</details>

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@rustbot label +F-const_trait_impl