ice: Const::from_anon_const: couldn't lit_to_const TypeError

[matthiaskrgr]

Code

#![feature(adt_const_params)]

pub trait Identity {
    type Identity;
}

impl<T> Identity for T {
    type Identity = Self;
}

pub fn foo<const X: <i32 as Identity>::Identity>() {}

fn main() {
    foo::<12>();
}

Meta

rustc --version --verbose:

rustc 1.74.0-nightly (8ce4540bd 2023-09-29)
binary: rustc
commit-hash: 8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72
commit-date: 2023-09-29
host: x86_64-unknown-linux-gnu
release: 1.74.0-nightly
LLVM version: 17.0.2

Error output

<output>

Backtrace

warning: the feature `adt_const_params` is incomplete and may not be safe to use and/or cause compiler crashes
 --> treereduce.out:1:12
  |
1 | #![feature(adt_const_params)]
  |            ^^^^^^^^^^^^^^^^
  |
  = note: see issue #95174 <https://github.com/rust-lang/rust/issues/95174> for more information
  = note: `#[warn(incomplete_features)]` on by default

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: Const::from_anon_const: couldn't lit_to_const TypeError
  --> treereduce.out:14:11
   |
14 |     foo::<12>();
   |           ^^
   |
note: delayed at compiler/rustc_middle/src/ty/consts.rs:202:30
         0: <rustc_errors::HandlerInner>::emit_diagnostic
         1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
         2: <rustc_middle::ty::consts::Const>::from_anon_const
         3: <<rustc_hir_typeck::fn_ctxt::FnCtxt>::instantiate_value_path::CreateCtorSubstsContext as rustc_hir_analysis::astconv::CreateSubstsForGenericArgsCtxt>::provided_kind
         4: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_path
         5: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_call
         6: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
         7: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_block_with_expected
         8: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
         9: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_return_expr
        10: rustc_hir_typeck::check::check_fn
        11: rustc_hir_typeck::typeck
        12: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
        13: <rustc_query_impl::query_impl::typeck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
        14: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        15: rustc_query_impl::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
        16: rustc_data_structures::sync::parallel::disabled::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_hir_analysis::check_crate::{closure#7}>::{closure#0}>
        17: rustc_hir_analysis::check_crate
        18: rustc_interface::passes::analysis
        19: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        20: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
        21: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        22: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        23: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#6}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        24: 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}>
        25: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_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>>
        26: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_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}
        27: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/alloc/src/boxed.rs:2007:9
        28: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/alloc/src/boxed.rs:2007:9
        29: std::sys::unix::thread::Thread::new::thread_start
                   at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/sys/unix/thread.rs:108:17
        30: <unknown>
        31: <unknown>
  --> treereduce.out:14:11
   |
14 |     foo::<12>();
   |           ^^

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 attach the file at `/tmp/im/rustc-ice-2023-10-01T05:58:41.536343834Z-1286952.txt` to your bug report

query stack during panic:
end of query stack
error: aborting due to 2 previous errors; 1 warning emitted

This issue has been assigned to @Jaic1 via this comment.

[matthiaskrgr]

Regression in nightly-2023-06-03
Regression in 8ebf042
Regression in rust-lang-ci@7a7436d

#111670 ?

[compiler-errors]

This is fixed by #116251.

[BoxyUwU]

@rustbot assign @Jaic1