ICE: expected usize, got N/#0: usize

[cushionbadak]

Code

(reduced)

fn as_chunks<const N: usize>() -> [u8; N] {
    loop {
        break;
    }
}

fn main() {}

Original Code

//@ check-pass
//
// Instead of checking that an error occurs without the feature gate,

fn as_chunks<const N: usize>() -> [u8; N] {
    loop {
        let _r = &[D(log, 30),
                  D(log, 31),
                  { D(log, 32); break; },
                  D(log, 33)][..];
    }
}

fn main() {
    let [_, _] = as_chunks();
}

• Guess that the original ICE-triggering code is mixture of following test files:
  • tests/ui/const-generics/infer_arr_len_from_pat.rs
  • tests/ui/drop/issue-30018-nopanic.rs

Meta

rustc --version --verbose:

rustc 1.79.0-nightly (0bf471f33 2024-04-13)
binary: rustc
commit-hash: 0bf471f339837af930ec90ef5e1e9cb232e99f29
commit-date: 2024-04-13
host: aarch64-apple-darwin
release: 1.79.0-nightly
LLVM version: 18.1.3

Command

rustc

Error output

<output>

Backtrace

error: internal compiler error: /rustc/0bf471f339837af930ec90ef5e1e9cb232e99f29/compiler/rustc_middle/src/ty/consts.rs:437:32: expected usize, got N/#0: usize

thread 'rustc' panicked at /rustc/0bf471f339837af930ec90ef5e1e9cb232e99f29/compiler/rustc_middle/src/ty/consts.rs:437:32:
Box<dyn Any>
stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
   1: <rustc_errors::diagnostic::BugAbort as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
   2: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>::{closure#0}
   3: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}
   4: rustc_middle::ty::context::tls::with_context_opt::<rustc_middle::ty::context::tls::with_opt<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
   5: rustc_middle::util::bug::bug_fmt
   6: rustc_hir_analysis::check::ty_kind_suggestion
   7: <rustc_hir_typeck::coercion::CoerceMany<&rustc_hir::hir::Expr>>::coerce_inner::<<rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_break::{closure#2}>
   8: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_kind
   9: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  10: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_stmt
  11: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_block_with_expected
  12: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_kind
  13: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  14: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_block_with_expected
  15: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  16: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_return_expr
  17: rustc_hir_typeck::check::check_fn
  18: rustc_hir_typeck::typeck
      [... omitted 2 frames ...]
  19: <rustc_middle::hir::map::Map>::par_body_owners::<rustc_hir_analysis::check_crate::{closure#4}>::{closure#0}
  20: <rustc_data_structures::sync::parallel::ParallelGuard>::run::<(), rustc_data_structures::sync::parallel::enabled::par_for_each_in<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_hir_analysis::check_crate::{closure#4}>::{closure#0}>::{closure#0}::{closure#0}::{closure#0}>
  21: rustc_hir_analysis::check_crate
  22: rustc_interface::passes::analysis
      [... omitted 2 frames ...]
  23: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure#3}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
  24: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
  25: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}::{closure#0}>
  26: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
  27: rustc_span::create_session_globals_then::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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: please attach the file at `/Users/jisukbyun/workspace/placeholder/0413_rust/rustc-ice-2024-04-14T03_01_42-57049.txt` to your bug report

query stack during panic:
#0 [typeck] type-checking `as_chunks`
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 1 previous error

Note

• ICE-location: compiler/rustc_middle/src/ty/consts.rs, Line-437, fn eval_target_usize
  

  rust/compiler/rustc_middle/src/ty/consts.rs

  Lines 433 to 438 in 0bf471f

  	#[inline]
  	/// Panics if the value cannot be evaluated or doesn't contain a valid `usize`.
  	pub fn eval_target_usize(self, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> u64 {
  	self.try_eval_target_usize(tcx, param_env)
  	.unwrap_or_else(|| bug!("expected usize, got {:#?}", self))
  	}

• Closed Issue ICE: expected usize, got UnevaluatedConst #116186 has identical ICE-location, compiler/rustc_middle/src/ty/consts.rs, Line-375, fn eval_target_usize

[cushionbadak]

searched nightlies: from nightly-2024-01-01 to nightly-2024-04-14
regressed nightly: nightly-2024-04-12
searched commit range: aa067fb...a07f3eb
regressed commit: 241fc13

bisected with cargo-bisect-rustc v0.6.8

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc --start 2024-01-01 --end 2024-04-14 --preserve --regress ice