ICE on stable/nightly: const parameter C/#0 (Const { ty: (), val: Param(C/#0) }/0) out of range when substituting substs=[]

[Plettro]

Code

#![feature(generic_const_exprs)]

struct S<const C:() = {}>() where S<{}>:;

Meta

rustc --version --verbose:

rustc 1.59.0 (9d1b2106e 2022-02-23)
binary: rustc
commit-hash: 9d1b2106e23b1abd32fce1f17267604a5102f57a
commit-date: 2022-02-23
host: x86_64-unknown-linux-gnu
release: 1.59.0
LLVM version: 13.0.0

Error output

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> lib.rs:1:1
  |
1 | #![feature(generic_const_exprs)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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

error[E0601]: `main` function not found in crate `lib`
 --> lib.rs:1:1
  |
1 | / #![feature(generic_const_exprs)]
2 | |
3 | | struct S<const C:() = {}>() where S<{}>:;
  | |_________________________________________^ consider adding a `main` function to `lib.rs`

error: internal compiler error: compiler/rustc_middle/src/ty/subst.rs:592:17: const parameter `C/#0` (Const { ty: (), val: Param(C/#0) }/0) out of range when substituting substs=[]

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/compiler/rustc_errors/src/lib.rs:1115:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

note: 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: rustc 1.59.0 (9d1b2106e 2022-02-23) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [check_item_well_formed] checking that `S` is well-formed
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors; 1 warning emitted

Some errors have detailed explanations: E0554, E0601.
For more information about an error, try `rustc --explain E0554`.

Backtrace

stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
   1: std::panic::panic_any::<rustc_errors::ExplicitBug>
   2: <rustc_errors::HandlerInner>::span_bug::<rustc_span::span_encoding::Span>
   3: <rustc_errors::Handler>::span_bug::<rustc_span::span_encoding::Span>
   4: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, ()>
   5: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>
   6: rustc_middle::util::bug::span_bug_fmt::<rustc_span::span_encoding::Span>
   7: <&rustc_middle::ty::consts::Const as rustc_middle::ty::fold::TypeFoldable>::try_fold_with::<rustc_middle::ty::subst::SubstFolder>
   8: <&rustc_middle::ty::consts::Const as rustc_middle::ty::fold::TypeFoldable>::super_fold_with::<rustc_middle::ty::subst::SubstFolder>
   9: <&rustc_middle::ty::TyS as rustc_middle::ty::fold::TypeFoldable>::super_fold_with::<rustc_middle::ty::subst::SubstFolder>
  10: <alloc::vec::Vec<rustc_middle::ty::Predicate> as alloc::vec::spec_extend::SpecExtend<rustc_middle::ty::Predicate, core::iter::adapters::map::Map<core::slice::iter::Iter<(rustc_middle::ty::Predicate, rustc_span::span_encoding::Span)>, <rustc_middle::ty::generics::GenericPredicates>::instantiate_into::{closure#0}>>>::spec_extend
  11: <rustc_middle::ty::generics::GenericPredicates>::instantiate_into
  12: <rustc_middle::ty::generics::GenericPredicates>::instantiate
  13: <rustc_trait_selection::traits::wf::WfPredicates>::nominal_obligations
  14: <rustc_trait_selection::traits::wf::WfPredicates>::compute
  15: <rustc_trait_selection::traits::fulfill::FulfillProcessor>::progress_changed_obligations
  16: <rustc_data_structures::obligation_forest::ObligationForest<rustc_trait_selection::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection::traits::fulfill::FulfillProcessor, rustc_data_structures::obligation_forest::Outcome<rustc_trait_selection::traits::fulfill::PendingPredicateObligation, rustc_infer::traits::FulfillmentErrorCode>>
  17: <rustc_trait_selection::traits::fulfill::FulfillmentContext as rustc_infer::traits::engine::TraitEngine>::select_all_or_error
  18: <rustc_typeck::check::fn_ctxt::FnCtxt>::select_all_obligations_or_error
  19: <rustc_infer::infer::InferCtxtBuilder>::enter::<(), <rustc_typeck::check::inherited::InheritedBuilder>::enter<<rustc_typeck::check::wfcheck::CheckWfFcxBuilder>::with_fcx<rustc_typeck::check::wfcheck::check_type_defn<rustc_typeck::check::wfcheck::check_item_well_formed::{closure#2}>::{closure#0}>::{closure#0}, ()>::{closure#0}>
  20: rustc_typeck::check::wfcheck::check_item_well_formed
  21: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalDefId, ()>>
  22: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::check_item_well_formed
  23: rustc_data_structures::sync::par_for_each_in::<&alloc::vec::Vec<core::option::Option<rustc_hir::hir::OwnerInfo>>, <rustc_middle::hir::map::Map>::par_visit_all_item_likes<rustc_typeck::check::wfcheck::CheckTypeWellFormedVisitor>::{closure#0}>
  24: <rustc_session::session::Session>::track_errors::<rustc_typeck::check_crate::{closure#5}, ()>
  25: rustc_typeck::check_crate
  26: rustc_interface::passes::analysis
  27: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorReported>>>
  28: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  29: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
  30: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
  31: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>
  32: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>

[Plettro]

If the feature gate is removed then no ICE occurs (both on stable and nightly)

[BoxyUwU]

should be the issue described in description of #86580 thought we had an issue tracking this but cant remember what it was called

[BoxyUwU]

closing in favor of #106994