ICE: DefId::expect_local DefId isn't local

[matthiaskrgr]

code:

#![feature(generic_const_exprs, transmutability)]

mod assert {
    use std::mem::TransmuteFrom;

    pub fn is_transmutable<Src, Dst>()
    where
        Dst: TransmuteFrom<Src>,
    {
    }
}

pub fn main() {}

Version information

rustc 1.85.0-nightly (8575f8f91 2024-12-03)
binary: rustc
commit-hash: 8575f8f91bbd7dca529d362afc8117db74661c3b
commit-date: 2024-12-03
host: x86_64-unknown-linux-gnu
release: 1.85.0-nightly
LLVM version: 19.1.4

Possibly related line of code:

rust/compiler/rustc_hir_analysis/src/collect/predicates_of.rs

Lines 395 to 407 in 8575f8f

	)
	}
	impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ConstCollector<'tcx> {
	fn visit_const(&mut self, c: ty::Const<'tcx>) {
	if let ty::ConstKind::Unevaluated(uv) = c.kind() {
	if is_const_param_default(self.tcx, uv.def.expect_local()) {
	// Do not look into const param defaults,
	// these get checked when they are actually instantiated.
	//
	// We do not want the following to error:
	//
	// struct Foo<const N: usize, const M: usize = { N + 1 }>;

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

Program output

warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /tmp/crash.rs:1:12
  |
1 | #![feature(generic_const_exprs, transmutability)]
  |            ^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
  = note: `#[warn(incomplete_features)]` on by default

thread 'rustc' panicked at compiler/rustc_hir_analysis/src/collect/predicates_of.rs:401:60:
DefId::expect_local: `DefId(2:2144 ~ core[958b]::mem::transmutability::TransmuteFrom::{constant#0})` isn't local
stack backtrace:
   0:     0x744f82b429ba - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h297eb035a685a8b3
   1:     0x744f83213ca6 - core::fmt::write::h8e5bb32e06fa555f
   2:     0x744f841d9f11 - std::io::Write::write_fmt::h5d3c55e1a008be63
   3:     0x744f82b42812 - std::sys::backtrace::BacktraceLock::print::h2e284e09a2de7ba2
   4:     0x744f82b44d1a - std::panicking::default_hook::{{closure}}::h69c9a1055a2222c1
   5:     0x744f82b44b63 - std::panicking::default_hook::h1b78022d7d188ab6
   6:     0x744f81cc19e8 - std[a8291144892739ee]::panicking::update_hook::<alloc[a1db28cf05e82ab]::boxed::Box<rustc_driver_impl[eeb16750bb3b6251]::install_ice_hook::{closure#0}>>::{closure#0}
   7:     0x744f82b45518 - std::panicking::rust_panic_with_hook::h032cdc7be3cb56c8
   8:     0x744f82b4520a - std::panicking::begin_panic_handler::{{closure}}::ha7afe2e3fcd9c50e
   9:     0x744f82b42e79 - std::sys::backtrace::__rust_end_short_backtrace::hda5e7bea82be6b3c
  10:     0x744f82b44ecd - rust_begin_unwind
  11:     0x744f7f7ae750 - core::panicking::panic_fmt::hf510dcbfda4b6faf
  12:     0x744f81ea6240 - <rustc_hir_analysis[4f3591f81681eb24]::collect::predicates_of::const_evaluatable_predicates_of::{closure#0}::ConstCollector as rustc_type_ir[36b6ce6a92c61b97]::visit::TypeVisitor<rustc_middle[e2ded4ee35845ccb]::ty::context::TyCtxt>>::visit_const
  13:     0x744f83fcc8ef - rustc_hir_analysis[4f3591f81681eb24]::collect::predicates_of::gather_explicit_predicates_of
  14:     0x744f83fc41f4 - rustc_query_impl[1566d5036aaf6ee4]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[1566d5036aaf6ee4]::query_impl::explicit_predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 24usize]>>
  15:     0x744f8338f670 - rustc_query_system[3e62bfa58e5579fb]::query::plumbing::try_execute_query::<rustc_query_impl[1566d5036aaf6ee4]::DynamicConfig<rustc_query_system[3e62bfa58e5579fb]::query::caches::DefIdCache<rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[1566d5036aaf6ee4]::plumbing::QueryCtxt, false>
  16:     0x744f8338eeb2 - rustc_query_impl[1566d5036aaf6ee4]::query_impl::explicit_predicates_of::get_query_non_incr::__rust_end_short_backtrace
  17:     0x744f8338d5c6 - rustc_hir_analysis[4f3591f81681eb24]::collect::predicates_of::predicates_of
  18:     0x744f8338d4e1 - rustc_query_impl[1566d5036aaf6ee4]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[1566d5036aaf6ee4]::query_impl::predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 24usize]>>
  19:     0x744f8338f659 - rustc_query_system[3e62bfa58e5579fb]::query::plumbing::try_execute_query::<rustc_query_impl[1566d5036aaf6ee4]::DynamicConfig<rustc_query_system[3e62bfa58e5579fb]::query::caches::DefIdCache<rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[1566d5036aaf6ee4]::plumbing::QueryCtxt, false>
  20:     0x744f8338edc6 - rustc_query_impl[1566d5036aaf6ee4]::query_impl::predicates_of::get_query_non_incr::__rust_end_short_backtrace
  21:     0x744f8337d99b - <rustc_hir_analysis[4f3591f81681eb24]::collect::CollectItemTypesVisitor as rustc_hir[8c6e6009ce07755a]::intravisit::Visitor>::visit_item
  22:     0x744f80e1da34 - rustc_hir_analysis[4f3591f81681eb24]::check::wfcheck::check_well_formed
  23:     0x744f83c86687 - rustc_query_impl[1566d5036aaf6ee4]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[1566d5036aaf6ee4]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 1usize]>>
  24:     0x744f83c86948 - rustc_query_system[3e62bfa58e5579fb]::query::plumbing::try_execute_query::<rustc_query_impl[1566d5036aaf6ee4]::DynamicConfig<rustc_data_structures[864da293b8c7000e]::vec_cache::VecCache<rustc_span[634f3266c1e253b7]::def_id::LocalDefId, rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[3e62bfa58e5579fb]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[1566d5036aaf6ee4]::plumbing::QueryCtxt, false>
  25:     0x744f83c86662 - rustc_query_impl[1566d5036aaf6ee4]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  26:     0x744f83c873ec - rustc_hir_analysis[4f3591f81681eb24]::check::wfcheck::check_mod_type_wf
  27:     0x744f83c8720b - rustc_query_impl[1566d5036aaf6ee4]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[1566d5036aaf6ee4]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 1usize]>>
  28:     0x744f84012308 - rustc_query_system[3e62bfa58e5579fb]::query::plumbing::try_execute_query::<rustc_query_impl[1566d5036aaf6ee4]::DynamicConfig<rustc_query_system[3e62bfa58e5579fb]::query::caches::DefaultCache<rustc_span[634f3266c1e253b7]::def_id::LocalModDefId, rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[1566d5036aaf6ee4]::plumbing::QueryCtxt, false>
  29:     0x744f840120b0 - rustc_query_impl[1566d5036aaf6ee4]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  30:     0x744f834c53dc - rustc_hir_analysis[4f3591f81681eb24]::check_crate
  31:     0x744f83b0eebc - rustc_interface[14f05bc75be5cd61]::passes::run_required_analyses
  32:     0x744f83b09f1e - rustc_interface[14f05bc75be5cd61]::passes::analysis
  33:     0x744f83b09eef - rustc_query_impl[1566d5036aaf6ee4]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[1566d5036aaf6ee4]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 1usize]>>
  34:     0x744f841467fa - rustc_query_system[3e62bfa58e5579fb]::query::plumbing::try_execute_query::<rustc_query_impl[1566d5036aaf6ee4]::DynamicConfig<rustc_query_system[3e62bfa58e5579fb]::query::caches::SingleCache<rustc_middle[e2ded4ee35845ccb]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[1566d5036aaf6ee4]::plumbing::QueryCtxt, false>
  35:     0x744f841464ce - rustc_query_impl[1566d5036aaf6ee4]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  36:     0x744f8426ed79 - rustc_interface[14f05bc75be5cd61]::interface::run_compiler::<core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>, rustc_driver_impl[eeb16750bb3b6251]::run_compiler::{closure#0}>::{closure#1}
  37:     0x744f840e1bc7 - std[a8291144892739ee]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[14f05bc75be5cd61]::util::run_in_thread_with_globals<rustc_interface[14f05bc75be5cd61]::util::run_in_thread_pool_with_globals<rustc_interface[14f05bc75be5cd61]::interface::run_compiler<core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>, rustc_driver_impl[eeb16750bb3b6251]::run_compiler::{closure#0}>::{closure#1}, core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>>::{closure#0}, core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>>
  38:     0x744f840e1862 - <<std[a8291144892739ee]::thread::Builder>::spawn_unchecked_<rustc_interface[14f05bc75be5cd61]::util::run_in_thread_with_globals<rustc_interface[14f05bc75be5cd61]::util::run_in_thread_pool_with_globals<rustc_interface[14f05bc75be5cd61]::interface::run_compiler<core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>, rustc_driver_impl[eeb16750bb3b6251]::run_compiler::{closure#0}>::{closure#1}, core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>>::{closure#0}, core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[958b0aa3988e400a]::result::Result<(), rustc_span[634f3266c1e253b7]::ErrorGuaranteed>>::{closure#1} as core[958b0aa3988e400a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  39:     0x744f840e0fab - std::sys::pal::unix::thread::Thread::new::thread_start::hcf422f7542348f85
  40:     0x744f7e4a339d - <unknown>
  41:     0x744f7e52849c - <unknown>
  42:                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: please attach the file at `/tmp/im/rustc-ice-2024-12-03T17_09_07-4164483.txt` to your bug report

query stack during panic:
#0 [explicit_predicates_of] computing explicit predicates of `assert::is_transmutable`
#1 [predicates_of] computing predicates of `assert::is_transmutable`
end of query stack
warning: 1 warning emitted

@rustbot label +F-generic_const_exprs +F-transmutability

[matthiaskrgr]

cc @camelid this went from "compiles" to ice with #133610