[ICE]: explicit index of non-indexable type

[wxie7]

Code

#![feature(deref_patterns)]
#![allow(incomplete_features)]
fn simple_vec(deref_patterns: Vec<u32>) -> u32 {
    (|| match Vec::<u32>::new() {
        deref!([]) => 100,
        _ => 2000,
    })()
}
fn main() {}

Affected release channels

• Previous Stable
• Current Stable
• Current Beta
• Current Nightly

Rust Version

rustc 1.84.0-nightly (bc5cf99 2024-11-05)
binary: rustc
commit-hash: bc5cf99
commit-date: 2024-11-05
host: x86_64-unknown-linux-gnu
release: 1.84.0-nightly
LLVM version: 19.1.3

Current error output

No response

Backtrace

     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, alloc::string::String>
     4: <&rustc_hir_typeck::fn_ctxt::FnCtxt as rustc_hir_typeck::expr_use_visitor::TypeInformationCtxt>::report_error::<&str>
     5: <rustc_hir_typeck::expr_use_visitor::ExprUseVisitor<&rustc_hir_typeck::fn_ctxt::FnCtxt, &mut rustc_hir_typeck::upvar::InferBorrowKind>>::cat_pattern::<<rustc_hir_typeck::expr_use_visitor::ExprUseVisitor<&rustc_hir_typeck::fn_ctxt::FnCtxt, &mut rustc_hir_typeck::upvar::InferBorrowKind>>::maybe_read_scrutinee<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_hir::hir::Arm>, <rustc_hir_typeck::expr_use_visitor::ExprUseVisitor<&rustc_hir_typeck::fn_ctxt::FnCtxt, &mut rustc_hir_typeck::upvar::InferBorrowKind>>::walk_expr::{closure#1}>>::{closure#0}>
     6: <rustc_hir_typeck::expr_use_visitor::ExprUseVisitor<&rustc_hir_typeck::fn_ctxt::FnCtxt, &mut rustc_hir_typeck::upvar::InferBorrowKind>>::cat_pattern::<<rustc_hir_typeck::expr_use_visitor::ExprUseVisitor<&rustc_hir_typeck::fn_ctxt::FnCtxt, &mut rustc_hir_typeck::upvar::InferBorrowKind>>::maybe_read_scrutinee<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_hir::hir::Arm>, <rustc_hir_typeck::expr_use_visitor::ExprUseVisitor<&rustc_hir_typeck::fn_ctxt::FnCtxt, &mut rustc_hir_typeck::upvar::InferBorrowKind>>::walk_expr::{closure#1}>>::{closure#0}>
     7: <rustc_hir_typeck::expr_use_visitor::ExprUseVisitor<&rustc_hir_typeck::fn_ctxt::FnCtxt, &mut rustc_hir_typeck::upvar::InferBorrowKind>>::walk_expr
     8: <rustc_hir_typeck::expr_use_visitor::ExprUseVisitor<&rustc_hir_typeck::fn_ctxt::FnCtxt, &mut rustc_hir_typeck::upvar::InferBorrowKind>>::consume_expr
     9: <rustc_hir_typeck::fn_ctxt::FnCtxt>::analyze_closure
    10: <rustc_hir_typeck::upvar::InferBorrowKindVisitor as rustc_hir::intravisit::Visitor>::visit_expr
    11: <rustc_hir_typeck::upvar::InferBorrowKindVisitor as rustc_hir::intravisit::Visitor>::visit_expr
    12: rustc_hir_typeck::typeck
    13: 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]>>
    14: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
    15: rustc_query_impl::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
    16: <rustc_middle::hir::map::Map>::par_body_owners::<rustc_hir_analysis::check_crate::{closure#4}>::{closure#0}
    17: rustc_hir_analysis::check_crate
    18: rustc_interface::passes::run_required_analyses
    19: rustc_interface::passes::analysis
    20: 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; 1]>>
    21: 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>
    22: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
    23: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
    24: 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<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
    25: <<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<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
    26: std::sys::pal::unix::thread::Thread::new::thread_start
    27: start_thread
               at ./nptl/pthread_create.c:442:8
    28: __GI___clone3
               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Anything else?

note: compiler flags: --crate-type staticlib -C link-dead-code -C debuginfo=2 -C opt-level=3 -Z mir-opt-level=3

[fmease]

Duplicate of #125059

[fmease]

Thanks for your report. In the future could you also fill out the section Current error output, not just the backtrace? With that I mean everything before the backtrace like

XXX XXX XXX XXX XXX XXX

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: XXX XXX XXX XXX XXXX

Lastly, in the future could you add the part that says note: delayed at XXX/XXX/XXX:XXX:XXX to the backtrace?

[wxie7]

Understood, I'll include that next time.

[Noratrieb]

@wxie7 see https://rustc-dev-guide.rust-lang.org/fuzzing.html

Don't seed your fuzzer with inputs that are known

it looks like your fuzzer might have been deeded by files in tests/crashes. don't do this, as these files are known to crash rustc

[wxie7]

@Noratrieb By the way, does an ICE have a unified identifier (besides the ICE report)? In some standard errors, it's 'thread ‘rustc’ panicked', while in others it's 'internal compiler error'.

[Noratrieb]

it's a bit of a mess, no. these two strings should be enough