rust-lang / rust-lang/rust

ICE: sty: `None`

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Since Oct 19, 2025.

C-bug I-ICE S-bug-has-test T-compiler
Dominant language
Rust
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Description

snippet:

const fn x() {
    let array = [(); { loop {} }];
    let nan1: f64 = unsafe { std::mem::transmute([4]) };
}

fn main() {}

Version information

rustc 1.87.0-nightly (ebf0cf75d 2025-03-11)
binary: rustc
commit-hash: ebf0cf75d368c035f4c7e7246d203bd469ee4a51
commit-date: 2025-03-11
host: x86_64-unknown-linux-gnu
release: 1.87.0-nightly
LLVM version: 20.1.0

Possibly related line of code:
https://github.com/rust-lang/rust/blob/ebf0cf75d368c035f4c7e7246d203bd469ee4a51/compiler/rustc_middle/src/ty/sty.rs#L2072-L2084

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output 

error: constant evaluation is taking a long time
 --> /tmp/icemaker_global_tempdir.OFXddYdTsfsI/rustc_testrunner_tmpdir_reporting.6eWFtohymixh/mvce.rs:2:24
  |
2 |     let array = [(); { loop {} }];
  |                        ^^^^^^^
  |
  = note: this lint makes sure the compiler doesn't get stuck due to infinite loops in const eval.
          If your compilation actually takes a long time, you can safely allow the lint.
help: the constant being evaluated
 --> /tmp/icemaker_global_tempdir.OFXddYdTsfsI/rustc_testrunner_tmpdir_reporting.6eWFtohymixh/mvce.rs:2:22
  |
2 |     let array = [(); { loop {} }];
  |                      ^^^^^^^^^^^
  = note: `#[deny(long_running_const_eval)]` on by default

warning: function `x` is never used
 --> /tmp/icemaker_global_tempdir.OFXddYdTsfsI/rustc_testrunner_tmpdir_reporting.6eWFtohymixh/mvce.rs:1:10
  |
1 | const fn x() {
  |          ^
  |
  = note: `#[warn(dead_code)]` on by default


thread 'rustc' panicked at compiler/rustc_middle/src/ty/sty.rs:2078:27:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x7e3346625b33 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h7fb80f6afbe41a33
   1:     0x7e3346e059d8 - core::fmt::write::h000527be0eea6fe8
   2:     0x7e334824ffd1 - std::io::Write::write_fmt::h4991a22851475fb5
   3:     0x7e3346625992 - std::sys::backtrace::BacktraceLock::print::hffad87dde00cbe3e
   4:     0x7e33466282b8 - std::panicking::default_hook::{{closure}}::ha46397973bec1239
   5:     0x7e3346627dd7 - std::panicking::default_hook::h706de72a1550eed4
   6:     0x7e3345693abf - std[ea0914bf68e3efbf]::panicking::update_hook::<alloc[3dfe61f71ba45cfe]::boxed::Box<rustc_driver_impl[23cd132fe59c5dfc]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7e3346628b23 - std::panicking::rust_panic_with_hook::h6666776865bd21f5
   8:     0x7e33466287e6 - std::panicking::begin_panic_handler::{{closure}}::hb8595612365d24db
   9:     0x7e3346625ff9 - std::sys::backtrace::__rust_end_short_backtrace::h7037f177c7ae4ed3
  10:     0x7e33466284dd - rust_begin_unwind
  11:     0x7e3343070ea0 - core::panicking::panic_fmt::hd26142fa9828e2a3
  12:     0x7e3343ca041c - core::panicking::panic::h59ce24d70b84159e
  13:     0x7e3344576a39 - core::option::unwrap_failed::h48c0f1454ecd4af7
  14:     0x7e33473e27a6 - <rustc_lint[3f5ee35a34c41153]::BuiltinCombinedModuleLateLintPass as rustc_lint[3f5ee35a34c41153]::passes::LateLintPass>::check_expr
  15:     0x7e33476f2ee4 - <rustc_lint[3f5ee35a34c41153]::late::LateContextAndPass<rustc_lint[3f5ee35a34c41153]::BuiltinCombinedModuleLateLintPass> as rustc_hir[9c8f1de648b82ae]::intravisit::Visitor>::visit_expr
  16:     0x7e33476f31ab - <rustc_lint[3f5ee35a34c41153]::late::LateContextAndPass<rustc_lint[3f5ee35a34c41153]::BuiltinCombinedModuleLateLintPass> as rustc_hir[9c8f1de648b82ae]::intravisit::Visitor>::visit_expr
  17:     0x7e33476f1e6e - <rustc_lint[3f5ee35a34c41153]::late::LateContextAndPass<rustc_lint[3f5ee35a34c41153]::BuiltinCombinedModuleLateLintPass> as rustc_hir[9c8f1de648b82ae]::intravisit::Visitor>::visit_block
  18:     0x7e33476f3245 - <rustc_lint[3f5ee35a34c41153]::late::LateContextAndPass<rustc_lint[3f5ee35a34c41153]::BuiltinCombinedModuleLateLintPass> as rustc_hir[9c8f1de648b82ae]::intravisit::Visitor>::visit_expr
  19:     0x7e33476f203f - <rustc_lint[3f5ee35a34c41153]::late::LateContextAndPass<rustc_lint[3f5ee35a34c41153]::BuiltinCombinedModuleLateLintPass> as rustc_hir[9c8f1de648b82ae]::intravisit::Visitor>::visit_block
  20:     0x7e334727ccf5 - <rustc_lint[3f5ee35a34c41153]::late::LateContextAndPass<rustc_lint[3f5ee35a34c41153]::BuiltinCombinedModuleLateLintPass> as rustc_hir[9c8f1de648b82ae]::intravisit::Visitor>::visit_nested_body
  21:     0x7e334727718d - <rustc_lint[3f5ee35a34c41153]::late::LateContextAndPass<rustc_lint[3f5ee35a34c41153]::BuiltinCombinedModuleLateLintPass> as rustc_hir[9c8f1de648b82ae]::intravisit::Visitor>::visit_nested_item
  22:     0x7e3347275d3a - rustc_lint[3f5ee35a34c41153]::lint_mod
  23:     0x7e3347275a3d - rustc_query_impl[977456df771add7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[977456df771add7]::query_impl::lint_mod::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8b56cfa39295cc9e]::query::erase::Erased<[u8; 0usize]>>
  24:     0x7e3347df874f - rustc_query_system[f942f53a11d60297]::query::plumbing::try_execute_query::<rustc_query_impl[977456df771add7]::DynamicConfig<rustc_query_system[f942f53a11d60297]::query::caches::DefaultCache<rustc_span[ef11c3aadf555ab3]::def_id::LocalModDefId, rustc_middle[8b56cfa39295cc9e]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[977456df771add7]::plumbing::QueryCtxt, false>
  25:     0x7e3347df783e - rustc_query_impl[977456df771add7]::query_impl::lint_mod::get_query_non_incr::__rust_end_short_backtrace
  26:     0x7e3347df73fd - rustc_lint[3f5ee35a34c41153]::late::check_crate::{closure#1}
  27:     0x7e3347df6f78 - rustc_lint[3f5ee35a34c41153]::late::check_crate
  28:     0x7e3347dfa8f2 - rustc_interface[15b2602f89c3a5c0]::passes::analysis
  29:     0x7e3347dfa6d7 - rustc_query_impl[977456df771add7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[977456df771add7]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8b56cfa39295cc9e]::query::erase::Erased<[u8; 0usize]>>
  30:     0x7e3347f1c981 - rustc_query_system[f942f53a11d60297]::query::plumbing::try_execute_query::<rustc_query_impl[977456df771add7]::DynamicConfig<rustc_query_system[f942f53a11d60297]::query::caches::SingleCache<rustc_middle[8b56cfa39295cc9e]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[977456df771add7]::plumbing::QueryCtxt, false>
  31:     0x7e3347f1c674 - rustc_query_impl[977456df771add7]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7e334815bfbc - rustc_interface[15b2602f89c3a5c0]::passes::create_and_enter_global_ctxt::<core[72d9f83855d8cc5b]::option::Option<rustc_interface[15b2602f89c3a5c0]::queries::Linker>, rustc_driver_impl[23cd132fe59c5dfc]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  33:     0x7e3347f74c97 - rustc_interface[15b2602f89c3a5c0]::interface::run_compiler::<(), rustc_driver_impl[23cd132fe59c5dfc]::run_compiler::{closure#0}>::{closure#1}
  34:     0x7e3347dd97c8 - std[ea0914bf68e3efbf]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[15b2602f89c3a5c0]::util::run_in_thread_with_globals<rustc_interface[15b2602f89c3a5c0]::util::run_in_thread_pool_with_globals<rustc_interface[15b2602f89c3a5c0]::interface::run_compiler<(), rustc_driver_impl[23cd132fe59c5dfc]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  35:     0x7e3347dda0b4 - <<std[ea0914bf68e3efbf]::thread::Builder>::spawn_unchecked_<rustc_interface[15b2602f89c3a5c0]::util::run_in_thread_with_globals<rustc_interface[15b2602f89c3a5c0]::util::run_in_thread_pool_with_globals<rustc_interface[15b2602f89c3a5c0]::interface::run_compiler<(), rustc_driver_impl[23cd132fe59c5dfc]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[72d9f83855d8cc5b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  36:     0x7e3347ddb4b7 - std::sys::pal::unix::thread::Thread::new::thread_start::ha1530b93ff336c49
  37:     0x7e3341ca370a - <unknown>
  38:     0x7e3341d27aac - <unknown>
  39:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

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 1.87.0-nightly (ebf0cf75d 2025-03-11) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [lint_mod] linting top-level module
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 1 previous error; 1 warning emitted

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