ICE: `unsupported pattern constructor Opaque(OpaqueId(0))`

[matthiaskrgr]

Code

#![feature(loop_match)]
fn test_f32(state: f32) {
    #[loop_match]
    loop {
        state = 'blk: {
            match state {
                1.0 =>
                {
                    #[const_continue]
                    break 'blk 2.5
                }
                4.0..3.0 => {
                    todo!()
                }
            }
        }
    }
}

pub fn main() {}

Meta

rustc --version --verbose:

rustc 1.90.0-nightly (11ad40bb8 2025-06-28)
binary: rustc
commit-hash: 11ad40bb839ca16f74784b4ab72596ad85587298
commit-date: 2025-06-28
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.7

Error output

error[E0579]: lower range bound must be less than upper
  --> code.rs:12:17
   |
12 |                 4.0..3.0 => {
   |                 ^^^^^^^^

Backtrace

error: internal compiler error: compiler/rustc_mir_build/src/builder/matches/mod.rs:2989:17: unsupported pattern constructor Opaque(OpaqueId(0))


thread 'rustc' panicked at compiler/rustc_mir_build/src/builder/matches/mod.rs:2989:17:
Box<dyn Any>
stack backtrace:
   0:     0x73ee7ccbc953 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h10462444a160a23e
   1:     0x73ee7d402c3f - core::fmt::write::h51c0bcd32e9179f7
   2:     0x73ee7ccb2583 - std::io::Write::write_fmt::h908d59959b12b593
   3:     0x73ee7ccbc7b2 - std::sys::backtrace::BacktraceLock::print::h559827260e117eb5
   4:     0x73ee7ccc02aa - std::panicking::default_hook::{{closure}}::hf7d7aca232e21fee
   5:     0x73ee7ccbfe2f - std::panicking::default_hook::h951460af7eec7d79
   6:     0x73ee7bd872b3 - std[c4951d6ea725fdb1]::panicking::update_hook::<alloc[ed4ebd4d2712f38a]::boxed::Box<rustc_driver_impl[5beb55ce640fb1f6]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x73ee7ccc0afb - std::panicking::rust_panic_with_hook::h679177229d0a92a0
   8:     0x73ee7bdc0da1 - std[c4951d6ea725fdb1]::panicking::begin_panic::<rustc_errors[f7c34cc2e5c865c0]::ExplicitBug>::{closure#0}
   9:     0x73ee7bdb5316 - std[c4951d6ea725fdb1]::sys::backtrace::__rust_end_short_backtrace::<std[c4951d6ea725fdb1]::panicking::begin_panic<rustc_errors[f7c34cc2e5c865c0]::ExplicitBug>::{closure#0}, !>
  10:     0x73ee7bdb5107 - std[c4951d6ea725fdb1]::panicking::begin_panic::<rustc_errors[f7c34cc2e5c865c0]::ExplicitBug>
  11:     0x73ee7bdca881 - <rustc_errors[f7c34cc2e5c865c0]::diagnostic::BugAbort as rustc_errors[f7c34cc2e5c865c0]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x73ee7c3965fa - rustc_middle[280599a7c0b63cac]::util::bug::opt_span_bug_fmt::<rustc_span[63a709b6f97e6c64]::span_encoding::Span>::{closure#0}
  13:     0x73ee7c37614a - rustc_middle[280599a7c0b63cac]::ty::context::tls::with_opt::<rustc_middle[280599a7c0b63cac]::util::bug::opt_span_bug_fmt<rustc_span[63a709b6f97e6c64]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x73ee7c375fbb - rustc_middle[280599a7c0b63cac]::ty::context::tls::with_context_opt::<rustc_middle[280599a7c0b63cac]::ty::context::tls::with_opt<rustc_middle[280599a7c0b63cac]::util::bug::opt_span_bug_fmt<rustc_span[63a709b6f97e6c64]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x73ee794a5f20 - rustc_middle[280599a7c0b63cac]::util::bug::bug_fmt
  16:     0x73ee7c4037da - <rustc_mir_build[61250234fad639b8]::builder::Builder>::static_pattern_match_inner
  17:     0x73ee7d882733 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::stmt_expr
  18:     0x73ee7d86d667 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  19:     0x73ee7d85edb3 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::as_temp::{closure#0}
  20:     0x73ee7d86cad8 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  21:     0x73ee7d86b1af - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  22:     0x73ee7e3abac3 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::ast_block_stmts
  23:     0x73ee7e3a9845 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::ast_block
  24:     0x73ee7d86ba43 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  25:     0x73ee7d86b1af - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  26:     0x73ee7d87bf25 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::lower_match_arms
  27:     0x73ee7c404c57 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::in_breakable_scope::<<rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest::{closure#4}>
  28:     0x73ee7d873d8f - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  29:     0x73ee7d85edb3 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::as_temp::{closure#0}
  30:     0x73ee7d86cad8 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  31:     0x73ee7d86b1af - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  32:     0x73ee7e3abac3 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::ast_block_stmts
  33:     0x73ee7e3a9845 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::ast_block
  34:     0x73ee7d86ba43 - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  35:     0x73ee7d86b1af - <rustc_mir_build[61250234fad639b8]::builder::Builder>::expr_into_dest
  36:     0x73ee7d88660f - rustc_mir_build[61250234fad639b8]::builder::build_mir
  37:     0x73ee7d408576 - rustc_mir_transform[c248dae4784aeba2]::mir_built
  38:     0x73ee7d408547 - rustc_query_impl[90fda7b54e01eb8a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[90fda7b54e01eb8a]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[280599a7c0b63cac]::query::erase::Erased<[u8; 8usize]>>
  39:     0x73ee7d67bdee - rustc_query_system[7573c0cbc77994c3]::query::plumbing::try_execute_query::<rustc_query_impl[90fda7b54e01eb8a]::DynamicConfig<rustc_data_structures[8aa99e22adfe0321]::vec_cache::VecCache<rustc_span[63a709b6f97e6c64]::def_id::LocalDefId, rustc_middle[280599a7c0b63cac]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[7573c0cbc77994c3]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[90fda7b54e01eb8a]::plumbing::QueryCtxt, false>
  40:     0x73ee7d67b849 - rustc_query_impl[90fda7b54e01eb8a]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  41:     0x73ee7de5f1ea - rustc_mir_build[61250234fad639b8]::check_unsafety::check_unsafety
  42:     0x73ee7de5ef63 - rustc_query_impl[90fda7b54e01eb8a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[90fda7b54e01eb8a]::query_impl::check_unsafety::dynamic_query::{closure#2}::{closure#0}, rustc_middle[280599a7c0b63cac]::query::erase::Erased<[u8; 0usize]>>
  43:     0x73ee7de5e579 - rustc_query_system[7573c0cbc77994c3]::query::plumbing::try_execute_query::<rustc_query_impl[90fda7b54e01eb8a]::DynamicConfig<rustc_data_structures[8aa99e22adfe0321]::vec_cache::VecCache<rustc_span[63a709b6f97e6c64]::def_id::LocalDefId, rustc_middle[280599a7c0b63cac]::query::erase::Erased<[u8; 0usize]>, rustc_query_system[7573c0cbc77994c3]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[90fda7b54e01eb8a]::plumbing::QueryCtxt, false>
  44:     0x73ee7de5e251 - rustc_query_impl[90fda7b54e01eb8a]::query_impl::check_unsafety::get_query_non_incr::__rust_end_short_backtrace
  45:     0x73ee7d67a621 - <rustc_middle[280599a7c0b63cac]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface[8a437e4317c52b63]::passes::run_required_analyses::{closure#1}::{closure#0}>::{closure#0}
  46:     0x73ee7d677ff2 - rustc_interface[8a437e4317c52b63]::passes::analysis
  47:     0x73ee7d6774cb - rustc_query_impl[90fda7b54e01eb8a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[90fda7b54e01eb8a]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[280599a7c0b63cac]::query::erase::Erased<[u8; 0usize]>>
  48:     0x73ee7e46707c - rustc_query_system[7573c0cbc77994c3]::query::plumbing::try_execute_query::<rustc_query_impl[90fda7b54e01eb8a]::DynamicConfig<rustc_query_system[7573c0cbc77994c3]::query::caches::SingleCache<rustc_middle[280599a7c0b63cac]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[90fda7b54e01eb8a]::plumbing::QueryCtxt, false>
  49:     0x73ee7e466c46 - rustc_query_impl[90fda7b54e01eb8a]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  50:     0x73ee7e672716 - rustc_interface[8a437e4317c52b63]::passes::create_and_enter_global_ctxt::<core[22eaa475d40112dd]::option::Option<rustc_interface[8a437e4317c52b63]::queries::Linker>, rustc_driver_impl[5beb55ce640fb1f6]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  51:     0x73ee7e62acaf - rustc_interface[8a437e4317c52b63]::interface::run_compiler::<(), rustc_driver_impl[5beb55ce640fb1f6]::run_compiler::{closure#0}>::{closure#1}
  52:     0x73ee7e5dbeb8 - std[c4951d6ea725fdb1]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[8a437e4317c52b63]::util::run_in_thread_with_globals<rustc_interface[8a437e4317c52b63]::util::run_in_thread_pool_with_globals<rustc_interface[8a437e4317c52b63]::interface::run_compiler<(), rustc_driver_impl[5beb55ce640fb1f6]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  53:     0x73ee7e5dbb96 - <<std[c4951d6ea725fdb1]::thread::Builder>::spawn_unchecked_<rustc_interface[8a437e4317c52b63]::util::run_in_thread_with_globals<rustc_interface[8a437e4317c52b63]::util::run_in_thread_pool_with_globals<rustc_interface[8a437e4317c52b63]::interface::run_compiler<(), rustc_driver_impl[5beb55ce640fb1f6]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[22eaa475d40112dd]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  54:     0x73ee7e5e1e7d - std::sys::pal::unix::thread::Thread::new::thread_start::hbedf4cad2dfbb9f8
  55:     0x73ee780a57eb - <unknown>
  56:     0x73ee7812918c - <unknown>
  57:                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: please attach the file at `/home/matthias/vcs/github/CRED/rustc-ice-2025-06-29T16_47_13-239544.txt` to your bug report

query stack during panic:
#0 [mir_built] building MIR for `test_f32`
#1 [check_unsafety] unsafety-checking `test_f32`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 2 previous errors; 1 warning emitted

For more information about this error, try `rustc --explain E0579`.