ICE for enum discriminant being a const generic

[programmerjake]

Code

pub enum E<const V: isize> {
    V = V,
}

Meta

version from playground:

1.69.0 (84c898d65 2023-04-16)

also occurs on nightly, from playground:

rustc 1.71.0-nightly (87b1f891e 2023-04-29)

Error output

   Compiling playground v0.0.1 (/playground)
error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: enum discriminant depends on generics
 --> src/lib.rs:2:9
  |
2 |     V = V,
  |         ^
  |
  = note: delayed at    0: <rustc_errors::HandlerInner>::emit_diagnostic
             1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, &str>
             2: <rustc_hir_analysis::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
             3: <rustc_middle::hir::map::Map>::visit_item_likes_in_module::<rustc_hir_analysis::collect::CollectItemTypesVisitor>
             4: rustc_hir_analysis::collect::collect_mod_item_types
             5: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::collect_mod_item_types, rustc_query_impl::plumbing::QueryCtxt>
             6: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::collect_mod_item_types
             7: <rustc_middle::hir::map::Map>::for_each_module::<rustc_hir_analysis::check_crate::{closure#0}::{closure#0}::{closure#0}>
             8: <rustc_session::session::Session>::track_errors::<rustc_hir_analysis::check_crate::{closure#0}, ()>
             9: rustc_hir_analysis::check_crate
            10: rustc_interface::passes::analysis
            11: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
            12: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
            13: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            14: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
            15: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
            16: std::sys_common::backtrace::__rust_begin_short_backtrace::<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#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            17: <<std::thread::Builder>::spawn_unchecked_<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#1}>::{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}
            18: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/87b1f891ea76713462cfc5a15137a8fe2b24ecc2/library/alloc/src/boxed.rs:1962:9
            19: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/87b1f891ea76713462cfc5a15137a8fe2b24ecc2/library/alloc/src/boxed.rs:1962:9
            20: std::sys::unix::thread::Thread::new::thread_start
                       at /rustc/87b1f891ea76713462cfc5a15137a8fe2b24ecc2/library/std/src/sys/unix/thread.rs:108:17
            21: start_thread
            22: clone
          

error: internal compiler error: enum discriminant depends on generics
 --> src/lib.rs:2:9
  |
2 |     V = V,
  |         ^
  |
  = note: delayed at    0: <rustc_errors::HandlerInner>::emit_diagnostic
             1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, &str>
             2: <core::iter::adapters::map::Map<core::iter::adapters::map::Map<core::iter::adapters::enumerate::Enumerate<core::slice::iter::Iter<rustc_middle::ty::VariantDef>>, <rustc_index::slice::IndexSlice<rustc_abi::VariantIdx, rustc_middle::ty::VariantDef>>::iter_enumerated::{closure#0}>, <rustc_middle::ty::adt::AdtDef>::discriminants::{closure#0}> as core::iter::traits::iterator::Iterator>::fold::<(), core::iter::traits::iterator::Iterator::for_each::call<(rustc_abi::VariantIdx, rustc_middle::ty::util::Discr), <alloc::vec::Vec<(rustc_abi::VariantIdx, rustc_middle::ty::util::Discr)>>::extend_trusted<core::iter::adapters::map::Map<core::iter::adapters::map::Map<core::iter::adapters::enumerate::Enumerate<core::slice::iter::Iter<rustc_middle::ty::VariantDef>>, <rustc_index::slice::IndexSlice<rustc_abi::VariantIdx, rustc_middle::ty::VariantDef>>::iter_enumerated::{closure#0}>, <rustc_middle::ty::adt::AdtDef>::discriminants::{closure#0}>>::{closure#0}>::{closure#0}>
             3: <alloc::vec::Vec<(rustc_abi::VariantIdx, rustc_middle::ty::util::Discr)> as alloc::vec::spec_from_iter::SpecFromIter<(rustc_abi::VariantIdx, rustc_middle::ty::util::Discr), core::iter::adapters::map::Map<core::iter::adapters::map::Map<core::iter::adapters::enumerate::Enumerate<core::slice::iter::Iter<rustc_middle::ty::VariantDef>>, <rustc_index::slice::IndexSlice<rustc_abi::VariantIdx, rustc_middle::ty::VariantDef>>::iter_enumerated::{closure#0}>, <rustc_middle::ty::adt::AdtDef>::discriminants::{closure#0}>>>::from_iter
             4: rustc_hir_analysis::check::check::check_mod_item_types
             5: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::check_mod_item_types, rustc_query_impl::plumbing::QueryCtxt>
             6: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::check_mod_item_types
             7: <rustc_middle::hir::map::Map>::for_each_module::<rustc_hir_analysis::check_crate::{closure#6}::{closure#0}>
             8: <rustc_session::session::Session>::time::<(), rustc_hir_analysis::check_crate::{closure#6}>
             9: rustc_hir_analysis::check_crate
            10: rustc_interface::passes::analysis
            11: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
            12: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
            13: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            14: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
            15: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
            16: std::sys_common::backtrace::__rust_begin_short_backtrace::<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#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            17: <<std::thread::Builder>::spawn_unchecked_<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#1}>::{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}
            18: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/87b1f891ea76713462cfc5a15137a8fe2b24ecc2/library/alloc/src/boxed.rs:1962:9
            19: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/87b1f891ea76713462cfc5a15137a8fe2b24ecc2/library/alloc/src/boxed.rs:1962:9
            20: std::sys::unix::thread::Thread::new::thread_start
                       at /rustc/87b1f891ea76713462cfc5a15137a8fe2b24ecc2/library/std/src/sys/unix/thread.rs:108:17
            21: start_thread
            22: clone
          

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 1.71.0-nightly (87b1f891e 2023-04-29) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: could not compile `playground` (lib)