ICE: `None` in compiler/rustc_middle/src/ty/sty.rs

[matthiaskrgr]

auto-reduced (treereduce-rust):

trait Collate<const MASK: u32> {
    type Pass;
    type Fail;
}

impl<H, T, const MASK: u32> Collate<MASK> for (H, T) {
    fn collate(self) -> (Self::Pass, Self::Fail) {
        <Collate<{ 1 == MASK & 1 }> as CollateStep<H>>::collate_step(self.0)
    }
}

original code

original:

#![feature(const_generics, const_evaluatable_checked)]

struct True;
struct False;

trait ConstBool {
    type Val;
}
struct TypeBool<const X: bool>;

impl ConstBool for TypeBool<true> {
    type Val = True;
}

impl ConstBool for TypeBool<false> {
    type Val = False;
}

trait Collate<const MASK: u32> {
    type Pass;
    type Fail;

    fn collate(self) -> (Self::Pass, Self::Fail);
}

impl<const MASK: u32> Collate<MASK> for () {
    type Pass = ();
    type Fail = ();

    fn collate(self) -> ((), ()) {
        ((), ())
    }
}

trait CollateStep<X, Prev> {
    3
    type Fail;
    fn collate_step(x: X, prev: Prev) -> (Self::Pass, Self::Fail);
}

impl<X, P, F> CollateStep<X, (P, F)> for TypeBool<true> {
    type Pass = (X, P);
    type Fail = F;

    fn collate_step(x: X, (p, f): (P, F)) -> ((X, P), F) {
        ((x, p), f)
    }
}

impl<X, P, F> CollateStep<X, (P, F)> for TypeBool<false> {
    type Pass = P;
    type Fail = (X, F);

    fn collate_step(x: X, (p, f): (P, F)) -> (P, (X, F)) {
        (p, (x, f))
    }
}

impl<H, T: Collate<{ MASK >> 1 }>, const MASK: u32> Collate<MASK> for (H, T)
where
    TypeBool<{ 1 == MASK & 1 }>: CollateStep<H, (T::Pass, T::Fail)>,
{
    type Pass =
        <TypeBool<{ 1 == MASK & 1 }> as CollateStep<H, (T::Pass, T::Fail)>>::Pass;
    type Fail =
        <TypeBool<{ 1 == MASK & 1 }> as CollateStep<H, (T::Pass, T::Fail)>>::Fail;

    fn collate(self) -> (Self::Pass, Self::Fail) {
        <Collate<{ 1 == MASK & 1 }>
         as CollateStep<H, (T::Pass, T::Fail)>>
         ::collate_step(self.0, self.1.collate())
    }
}

fn collate<X,const MASK:u32>(x:X)->(X::Pass, X::Fail)
where X:Collate<MASK> {
    self.1()
}

fn main() {
    dbg!(collate::<_,3>((4, ('!',()))));
}

Version information

rustc 1.82.0-nightly (4b7d074d7 2024-08-15)
binary: rustc
commit-hash: 4b7d074d766d00a32fa8b2e4fa3813dd7d4d64e6
commit-date: 2024-08-15
host: x86_64-unknown-linux-gnu
release: 1.82.0-nightly
LLVM version: 19.1.0

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

Program output

error[E0407]: method `collate` is not a member of trait `Collate`
 --> /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:7:5
  |
7 | /     fn collate(self) -> (Self::Pass, Self::Fail) {
8 | |         <Collate<{ 1 == MASK & 1 }> as CollateStep<H>>::collate_step(self.0)
9 | |     }
  | |_____^ not a member of trait `Collate`

error: generic parameters may not be used in const operations
 --> /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:8:25
  |
8 |         <Collate<{ 1 == MASK & 1 }> as CollateStep<H>>::collate_step(self.0)
  |                         ^^^^ cannot perform const operation using `MASK`
  |
  = help: const parameters may only be used as standalone arguments, i.e. `MASK`
  = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions

error[E0405]: cannot find trait `CollateStep` in this scope
 --> /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:8:40
  |
8 |         <Collate<{ 1 == MASK & 1 }> as CollateStep<H>>::collate_step(self.0)
  |                                        ^^^^^^^^^^^ not found in this scope

error[E0601]: `main` function not found in crate `mvce`
  --> /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:10:2
   |
10 | }
   |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs`

error[E0046]: not all trait items implemented, missing: `Pass`, `Fail`
 --> /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:6:1
  |
2 |     type Pass;
  |     --------- `Pass` from trait
3 |     type Fail;
  |     --------- `Fail` from trait
...
6 | impl<H, T, const MASK: u32> Collate<MASK> for (H, T) {
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `Pass`, `Fail` in implementation

warning: trait objects without an explicit `dyn` are deprecated
 --> /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:8:10
  |
8 |         <Collate<{ 1 == MASK & 1 }> as CollateStep<H>>::collate_step(self.0)
  |          ^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
  = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
  = note: `#[warn(bare_trait_objects)]` on by default
help: if this is an object-safe trait, use `dyn`
  |
8 |         <dyn Collate<{ 1 == MASK & 1 }> as CollateStep<H>>::collate_step(self.0)
  |          +++

error[E0191]: the value of the associated types `Pass` and `Fail` in `Collate` must be specified
 --> /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:8:10
  |
2 |     type Pass;
  |     --------- `Pass` defined here
3 |     type Fail;
  |     --------- `Fail` defined here
...
8 |         <Collate<{ 1 == MASK & 1 }> as CollateStep<H>>::collate_step(self.0)
  |          ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: specify the associated types: `Collate<{ 1 == MASK & 1 }, Pass = Type, Fail = Type>`

error[E0308]: mismatched types
 --> /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:8:20
  |
8 |         <Collate<{ 1 == MASK & 1 }> as CollateStep<H>>::collate_step(self.0)
  |                    ^^^^^^^^^^^^^ expected `u32`, found `bool`

thread 'rustc' panicked at compiler/rustc_middle/src/ty/sty.rs:362:36:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x756daf5b8efd - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h9dbfa5a13334a048
   1:     0x756dafe05297 - core::fmt::write::hcbbcd98e2555f5d0
   2:     0x756db0dbef11 - std::io::Write::write_fmt::hbce2407a9809228c
   3:     0x756daf5bb5db - std::panicking::default_hook::{{closure}}::h5281c3800a5e87cc
   4:     0x756daf5bb24e - std::panicking::default_hook::hc6eb547e64d62a2d
   5:     0x756dae74ef59 - std[3d2b83dd2aabb1df]::panicking::update_hook::<alloc[2925aedc1a634bb5]::boxed::Box<rustc_driver_impl[df17b2027db720ee]::install_ice_hook::{closure#0}>>::{closure#0}
   6:     0x756daf5bbef7 - std::panicking::rust_panic_with_hook::h88497b8939cfe9de
   7:     0x756daf5bbb83 - std::panicking::begin_panic_handler::{{closure}}::hca70fb01649d46e8
   8:     0x756daf5b93b9 - std::sys::backtrace::__rust_end_short_backtrace::h6a031b654d0ad1a2
   9:     0x756daf5bb884 - rust_begin_unwind
  10:     0x756dac7a1f93 - core::panicking::panic_fmt::h818a0d1eb005cfb3
  11:     0x756dac663a7c - core::panicking::panic::h1e56b544c77c5180
  12:     0x756dac7b3019 - core::option::unwrap_failed::habc9b524efb569a1
  13:     0x756db188d87c - <rustc_middle[b1a78737217f88d2]::ty::sty::ParamConst>::find_ty_from_env.cold
  14:     0x756dac466fa7 - <rustc_trait_selection[e1be1b7552eed254]::traits::fulfill::FulfillProcessor as rustc_data_structures[95451bf12efeed46]::obligation_forest::ObligationProcessor>::process_obligation
  15:     0x756dafe08777 - <rustc_data_structures[95451bf12efeed46]::obligation_forest::ObligationForest<rustc_trait_selection[e1be1b7552eed254]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[e1be1b7552eed254]::traits::fulfill::FulfillProcessor>
  16:     0x756db016f5ed - <rustc_hir_typeck[c3f01b2c610829a2]::fn_ctxt::FnCtxt>::type_inference_fallback
  17:     0x756db0167aac - rustc_hir_typeck[c3f01b2c610829a2]::typeck
  18:     0x756db01674f3 - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>
  19:     0x756db00c7179 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::VecCache<rustc_span[17985c86cfc7b367]::def_id::LocalDefId, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  20:     0x756db00c6395 - rustc_query_impl[9ef7872d5217e630]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  21:     0x756db061b4db - rustc_mir_build[8030a5d9df7a35f7]::thir::pattern::check_match::check_match
  22:     0x756db061ac1b - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::check_match::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 1usize]>>
  23:     0x756db061a291 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::VecCache<rustc_span[17985c86cfc7b367]::def_id::LocalDefId, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  24:     0x756db0619fdd - rustc_query_impl[9ef7872d5217e630]::query_impl::check_match::get_query_non_incr::__rust_end_short_backtrace
  25:     0x756db0631192 - rustc_mir_build[8030a5d9df7a35f7]::build::mir_build
  26:     0x756db063084e - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>
  27:     0x756db00c7179 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::VecCache<rustc_span[17985c86cfc7b367]::def_id::LocalDefId, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  28:     0x756db00c6c8d - rustc_query_impl[9ef7872d5217e630]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  29:     0x756db06ceced - rustc_mir_transform[1c9d8798cf57df7a]::mir_const_qualif
  30:     0x756db06cebf7 - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::mir_const_qualif::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 4usize]>>
  31:     0x756db06ce00e - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::DefIdCache<rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 4usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  32:     0x756db06cdda3 - rustc_query_impl[9ef7872d5217e630]::query_impl::mir_const_qualif::get_query_non_incr::__rust_end_short_backtrace
  33:     0x756db06173da - rustc_mir_transform[1c9d8798cf57df7a]::mir_promoted
  34:     0x756db0616d52 - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 16usize]>>
  35:     0x756db024c810 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::VecCache<rustc_span[17985c86cfc7b367]::def_id::LocalDefId, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  36:     0x756db0f1ca10 - rustc_query_impl[9ef7872d5217e630]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  37:     0x756db0f1cb03 - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>
  38:     0x756db00c7179 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::VecCache<rustc_span[17985c86cfc7b367]::def_id::LocalDefId, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  39:     0x756db00c6bcd - rustc_query_impl[9ef7872d5217e630]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  40:     0x756db00be34f - rustc_mir_transform[1c9d8798cf57df7a]::mir_drops_elaborated_and_const_checked
  41:     0x756db00bd83d - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>
  42:     0x756db00c7179 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::VecCache<rustc_span[17985c86cfc7b367]::def_id::LocalDefId, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  43:     0x756db00c6b0d - rustc_query_impl[9ef7872d5217e630]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  44:     0x756db06d5e75 - rustc_mir_transform[1c9d8798cf57df7a]::mir_for_ctfe
  45:     0x756db06d5d27 - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::mir_for_ctfe::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>
  46:     0x756dafe99fa7 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::DefIdCache<rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  47:     0x756db0a1635f - rustc_query_impl[9ef7872d5217e630]::query_impl::mir_for_ctfe::get_query_non_incr::__rust_end_short_backtrace
  48:     0x756db0a164a0 - <rustc_const_eval[8d29268bebe65f61]::interpret::eval_context::InterpCx<rustc_const_eval[8d29268bebe65f61]::const_eval::machine::CompileTimeMachine>>::load_mir
  49:     0x756db0a17712 - rustc_const_eval[8d29268bebe65f61]::const_eval::eval_queries::eval_to_allocation_raw_provider
  50:     0x756db0a17448 - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 24usize]>>
  51:     0x756db0a12012 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::DefaultCache<rustc_middle[b1a78737217f88d2]::ty::ParamEnvAnd<rustc_middle[b1a78737217f88d2]::mir::interpret::GlobalId>, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  52:     0x756db0a11bef - rustc_query_impl[9ef7872d5217e630]::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace
  53:     0x756db09f7cf3 - rustc_const_eval[8d29268bebe65f61]::const_eval::valtrees::eval_to_valtree
  54:     0x756db09f7b03 - <rustc_const_eval[8d29268bebe65f61]::provide::{closure#0} as core[77596ae8a24c31da]::ops::function::FnOnce<(rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt, rustc_middle[b1a78737217f88d2]::ty::ParamEnvAnd<rustc_middle[b1a78737217f88d2]::mir::interpret::GlobalId>)>>::call_once
  55:     0x756db09f7aba - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::eval_to_valtree::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 24usize]>>
  56:     0x756db09f7a7b - <rustc_query_impl[9ef7872d5217e630]::query_impl::eval_to_valtree::dynamic_query::{closure#2} as core[77596ae8a24c31da]::ops::function::FnOnce<(rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt, rustc_middle[b1a78737217f88d2]::ty::ParamEnvAnd<rustc_middle[b1a78737217f88d2]::mir::interpret::GlobalId>)>>::call_once
  57:     0x756db0a120ed - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::DefaultCache<rustc_middle[b1a78737217f88d2]::ty::ParamEnvAnd<rustc_middle[b1a78737217f88d2]::mir::interpret::GlobalId>, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  58:     0x756db08aba48 - rustc_query_impl[9ef7872d5217e630]::query_impl::eval_to_valtree::get_query_non_incr::__rust_end_short_backtrace
  59:     0x756db08aa622 - rustc_middle[b1a78737217f88d2]::query::plumbing::query_get_at::<rustc_query_system[897f24727061e191]::query::caches::DefaultCache<rustc_middle[b1a78737217f88d2]::ty::ParamEnvAnd<rustc_middle[b1a78737217f88d2]::mir::interpret::GlobalId>, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 24usize]>>>
  60:     0x756db08aa05c - <rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt>::const_eval_global_id_for_typeck
  61:     0x756db08a483e - <rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
  62:     0x756db08a44ce - <rustc_middle[b1a78737217f88d2]::ty::consts::Const>::eval
  63:     0x756db08a3fd6 - <rustc_trait_selection[e1be1b7552eed254]::traits::normalize::AssocTypeNormalizer as rustc_type_ir[3c2561b8ed23244e]::fold::TypeFolder<rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt>>::fold_const
  64:     0x756db0700066 - <&rustc_middle[b1a78737217f88d2]::ty::list::RawList<(), rustc_middle[b1a78737217f88d2]::ty::generic_args::GenericArg> as rustc_type_ir[3c2561b8ed23244e]::fold::TypeFoldable<rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt>>::try_fold_with::<rustc_trait_selection[e1be1b7552eed254]::traits::normalize::AssocTypeNormalizer>
  65:     0x756daf454aff - <rustc_trait_selection[e1be1b7552eed254]::traits::normalize::AssocTypeNormalizer as rustc_type_ir[3c2561b8ed23244e]::fold::TypeFolder<rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt>>::fold_binder::<rustc_type_ir[3c2561b8ed23244e]::predicate::ExistentialPredicate<rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt>>
  66:     0x756db0702537 - <rustc_middle[b1a78737217f88d2]::ty::Ty as rustc_type_ir[3c2561b8ed23244e]::fold::TypeSuperFoldable<rustc_middle[b1a78737217f88d2]::ty::context::TyCtxt>>::try_super_fold_with::<rustc_trait_selection[e1be1b7552eed254]::traits::normalize::AssocTypeNormalizer>
  67:     0x756dafed4504 - <rustc_hir_typeck[c3f01b2c610829a2]::fn_ctxt::FnCtxt>::normalize::<rustc_middle[b1a78737217f88d2]::ty::Ty>
  68:     0x756db0694f08 - <dyn rustc_hir_analysis[93a8a2dd976a2b34]::hir_ty_lowering::HirTyLowerer>::lower_ty_common::{closure#0}
  69:     0x756db03d4f29 - <rustc_hir_typeck[c3f01b2c610829a2]::fn_ctxt::FnCtxt>::check_expr_path
  70:     0x756db08d3c18 - <rustc_hir_typeck[c3f01b2c610829a2]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  71:     0x756db08d5351 - <rustc_hir_typeck[c3f01b2c610829a2]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  72:     0x756db08cea16 - <rustc_hir_typeck[c3f01b2c610829a2]::fn_ctxt::FnCtxt>::check_block_with_expected
  73:     0x756db08d5e0b - <rustc_hir_typeck[c3f01b2c610829a2]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  74:     0x756dafec0777 - rustc_hir_typeck[c3f01b2c610829a2]::check::check_fn
  75:     0x756db0167a9f - rustc_hir_typeck[c3f01b2c610829a2]::typeck
  76:     0x756db01674f3 - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>
  77:     0x756db00c7179 - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::VecCache<rustc_span[17985c86cfc7b367]::def_id::LocalDefId, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  78:     0x756db00c6395 - rustc_query_impl[9ef7872d5217e630]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  79:     0x756db00c601b - <rustc_middle[b1a78737217f88d2]::hir::map::Map>::par_body_owners::<rustc_hir_analysis[93a8a2dd976a2b34]::check_crate::{closure#4}>::{closure#0}
  80:     0x756db00c3d64 - rustc_hir_analysis[93a8a2dd976a2b34]::check_crate
  81:     0x756db07fdfff - rustc_interface[cd3bffbbdd36a14f]::passes::run_required_analyses
  82:     0x756db092a75e - rustc_interface[cd3bffbbdd36a14f]::passes::analysis
  83:     0x756db092a731 - rustc_query_impl[9ef7872d5217e630]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9ef7872d5217e630]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 1usize]>>
  84:     0x756db0d88b2e - rustc_query_system[897f24727061e191]::query::plumbing::try_execute_query::<rustc_query_impl[9ef7872d5217e630]::DynamicConfig<rustc_query_system[897f24727061e191]::query::caches::SingleCache<rustc_middle[b1a78737217f88d2]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[9ef7872d5217e630]::plumbing::QueryCtxt, false>
  85:     0x756db0d8888f - rustc_query_impl[9ef7872d5217e630]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  86:     0x756db0be69ea - rustc_interface[cd3bffbbdd36a14f]::interface::run_compiler::<core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>, rustc_driver_impl[df17b2027db720ee]::run_compiler::{closure#0}>::{closure#1}
  87:     0x756db0bc5bd0 - std[3d2b83dd2aabb1df]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[cd3bffbbdd36a14f]::util::run_in_thread_with_globals<rustc_interface[cd3bffbbdd36a14f]::util::run_in_thread_pool_with_globals<rustc_interface[cd3bffbbdd36a14f]::interface::run_compiler<core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>, rustc_driver_impl[df17b2027db720ee]::run_compiler::{closure#0}>::{closure#1}, core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>>::{closure#0}, core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>>
  88:     0x756db0bc623a - <<std[3d2b83dd2aabb1df]::thread::Builder>::spawn_unchecked_<rustc_interface[cd3bffbbdd36a14f]::util::run_in_thread_with_globals<rustc_interface[cd3bffbbdd36a14f]::util::run_in_thread_pool_with_globals<rustc_interface[cd3bffbbdd36a14f]::interface::run_compiler<core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>, rustc_driver_impl[df17b2027db720ee]::run_compiler::{closure#0}>::{closure#1}, core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>>::{closure#0}, core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[77596ae8a24c31da]::result::Result<(), rustc_span[17985c86cfc7b367]::ErrorGuaranteed>>::{closure#1} as core[77596ae8a24c31da]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  89:     0x756db0bc65ab - std::sys::pal::unix::thread::Thread::new::thread_start::h360706b1a7e57c20
  90:     0x756db22e139d - <unknown>
  91:     0x756db236649c - <unknown>
  92:                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 1.82.0-nightly (4b7d074d7 2024-08-15) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `<impl at /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:6:1: 6:53>::collate::{constant#0}`
#1 [check_match] match-checking `<impl at /tmp/icemaker_global_tempdir.QNaAT9qATeCf/rustc_testrunner_tmpdir_reporting.yNN1vodqNDs9/mvce.rs:6:1: 6:53>::collate::{constant#0}`
end of query stack
error: aborting due to 7 previous errors; 1 warning emitted

Some errors have detailed explanations: E0046, E0191, E0308, E0405, E0407, E0601.
For more information about an error, try `rustc --explain E0046`.

@rustbot label +F-const_generics +F-const_evaluatable_checked

[theemathas]

Slightly minimized with fewer errors:

fn generic<const N: u32>() {}

trait Collate<const MASK: u32> {
    type Pass;
    fn collate(self) -> Self::Pass;
}

impl<const MASK: u32> Collate<MASK> for i32 {
    type Pass = ();
    fn collate(self) -> Self::Pass {
        generic::<{ true }>()
    }
}

The compiler seems to have trouble figuring out whether the type of generic::<{ true }>() matches the returned type Self::Pass

Program output

   Compiling playground v0.0.1 (/playground)
warning: unnecessary braces around const expression
  --> src/lib.rs:11:19
   |
11 |         generic::<{ true }>()
   |                   ^^    ^^
   |
   = note: `#[warn(unused_braces)]` on by default
help: remove these braces
   |
11 -         generic::<{ true }>()
11 +         generic::<true>()
   |

error[E0308]: mismatched types
  --> src/lib.rs:11:21
   |
11 |         generic::<{ true }>()
   |                     ^^^^ expected `u32`, found `bool`

thread 'rustc' panicked at compiler/rustc_middle/src/ty/sty.rs:360:36:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x7f12de777f05 - std::backtrace_rs::backtrace::libunwind::trace::h23054e327d0d4b55
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7f12de777f05 - std::backtrace_rs::backtrace::trace_unsynchronized::h0cc587407d7f7f64
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f12de777f05 - std::sys_common::backtrace::_print_fmt::h4feeb59774730d6b
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f12de777f05 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd736fd5964392270
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f12de7c8c4b - core::fmt::rt::Argument::fmt::h105051d8ea1ade1e
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/fmt/rt.rs:165:63
   5:     0x7f12de7c8c4b - core::fmt::write::hc6043626647b98ea
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/fmt/mod.rs:1168:21
   6:     0x7f12de76cbdf - std::io::Write::write_fmt::h0d24b3e0473045db
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/io/mod.rs:1835:15
   7:     0x7f12de777cde - std::sys_common::backtrace::_print::h62df6fc36dcebfc8
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f12de777cde - std::sys_common::backtrace::print::h45eb8174d25a1e76
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f12de77a719 - std::panicking::default_hook::{{closure}}::haf3f0170eb4f3b53
  10:     0x7f12de77a4ba - std::panicking::default_hook::hb5d3b27aa9f6dcda
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:298:9
  11:     0x7f12e18020c1 - std[fba9fafec3bdacf8]::panicking::update_hook::<alloc[a325a9cea6fa5e89]::boxed::Box<rustc_driver_impl[ce01f96e2e949677]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f12de77ae4b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h2026a29033a1b9f6
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2077:9
  13:     0x7f12de77ae4b - std::panicking::rust_panic_with_hook::h6b49d59f86ee588c
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:799:13
  14:     0x7f12de77ab8b - std::panicking::begin_panic_handler::{{closure}}::hd4c2f7ed79b82b70
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:656:13
  15:     0x7f12de7783c9 - std::sys_common::backtrace::__rust_end_short_backtrace::h2946d6d32d7ea1ad
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f12de77a8f7 - rust_begin_unwind
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/panicking.rs:652:5
  17:     0x7f12de7c51e3 - core::panicking::panic_fmt::ha02418e5cd774672
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/panicking.rs:72:14
  18:     0x7f12de7c528c - core::panicking::panic::h6c780fb115b2371d
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/panicking.rs:146:5
  19:     0x7f12de7c4f29 - core::option::unwrap_failed::hff19eb16beb38f1f
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/core/src/option.rs:1985:5
  20:     0x7f12e436fb32 - <rustc_middle[ecc07153edf3c281]::ty::sty::ParamConst>::find_ty_from_env.cold
  21:     0x7f12dfb50504 - <rustc_trait_selection[bf98a35716bfd7e5]::traits::fulfill::FulfillProcessor as rustc_data_structures[25e6784d61918b0d]::obligation_forest::ObligationProcessor>::process_obligation
  22:     0x7f12e2bf3a3d - <rustc_data_structures[25e6784d61918b0d]::obligation_forest::ObligationForest<rustc_trait_selection[bf98a35716bfd7e5]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[bf98a35716bfd7e5]::traits::fulfill::FulfillProcessor>
  23:     0x7f12e355cdae - <rustc_hir_typeck[624c394323d1dd51]::fn_ctxt::FnCtxt>::type_inference_fallback
  24:     0x7f12e3562c0a - rustc_hir_typeck[624c394323d1dd51]::typeck
  25:     0x7f12e35618cf - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>
  26:     0x7f12e2d47aeb - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::VecCache<rustc_span[4d50fd03223eefaa]::def_id::LocalDefId, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  27:     0x7f12e2d474e5 - rustc_query_impl[c1633093ec927e0e]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  28:     0x7f12e2f64af8 - rustc_mir_build[7b7735d0d37e34f3]::thir::pattern::check_match::check_match
  29:     0x7f12e2f63f23 - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::check_match::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 1usize]>>
  30:     0x7f12e2f636a9 - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::VecCache<rustc_span[4d50fd03223eefaa]::def_id::LocalDefId, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  31:     0x7f12e2f63381 - rustc_query_impl[c1633093ec927e0e]::query_impl::check_match::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7f12e2f69cd9 - rustc_mir_build[7b7735d0d37e34f3]::build::mir_build
  33:     0x7f12e2f6938e - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>
  34:     0x7f12e2d47aeb - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::VecCache<rustc_span[4d50fd03223eefaa]::def_id::LocalDefId, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  35:     0x7f12e2d47593 - rustc_query_impl[c1633093ec927e0e]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f12e34c9d4f - rustc_mir_transform[e8632467688ea17a]::mir_const_qualif
  37:     0x7f12e34c9c69 - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::mir_const_qualif::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 4usize]>>
  38:     0x7f12e34c955d - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::DefIdCache<rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 4usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  39:     0x7f12e34c932d - rustc_query_impl[c1633093ec927e0e]::query_impl::mir_const_qualif::get_query_non_incr::__rust_end_short_backtrace
  40:     0x7f12e069b68f - rustc_mir_transform[e8632467688ea17a]::mir_promoted
  41:     0x7f12e3245122 - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 16usize]>>
  42:     0x7f12e324539e - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::VecCache<rustc_span[4d50fd03223eefaa]::def_id::LocalDefId, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  43:     0x7f12e3aa0ad0 - rustc_query_impl[c1633093ec927e0e]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  44:     0x7f12e3aa0b9d - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>
  45:     0x7f12e2d47aeb - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::VecCache<rustc_span[4d50fd03223eefaa]::def_id::LocalDefId, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  46:     0x7f12e2d4764d - rustc_query_impl[c1633093ec927e0e]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  47:     0x7f12e069fc71 - rustc_mir_transform[e8632467688ea17a]::mir_drops_elaborated_and_const_checked
  48:     0x7f12e2d477f9 - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>
  49:     0x7f12e2d47aeb - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::VecCache<rustc_span[4d50fd03223eefaa]::def_id::LocalDefId, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  50:     0x7f12e2d4734d - rustc_query_impl[c1633093ec927e0e]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  51:     0x7f12e34cbe9f - rustc_mir_transform[e8632467688ea17a]::mir_for_ctfe
  52:     0x7f12e34cbd9f - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::mir_for_ctfe::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>
  53:     0x7f12e2cc2e3c - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::DefIdCache<rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  54:     0x7f12e2cbf720 - rustc_query_impl[c1633093ec927e0e]::query_impl::mir_for_ctfe::get_query_non_incr::__rust_end_short_backtrace
  55:     0x7f12e2cbf833 - <rustc_const_eval[964325fd78f4b8e1]::interpret::eval_context::InterpCx<rustc_const_eval[964325fd78f4b8e1]::const_eval::machine::CompileTimeInterpreter>>::load_mir
  56:     0x7f12e09cbdaa - rustc_const_eval[964325fd78f4b8e1]::const_eval::eval_queries::eval_to_allocation_raw_provider
  57:     0x7f12e32da0c2 - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 24usize]>>
  58:     0x7f12e32d9de6 - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::DefaultCache<rustc_middle[ecc07153edf3c281]::ty::ParamEnvAnd<rustc_middle[ecc07153edf3c281]::mir::interpret::GlobalId>, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  59:     0x7f12e32d9a36 - rustc_query_impl[c1633093ec927e0e]::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace
  60:     0x7f12e39662b0 - rustc_const_eval[964325fd78f4b8e1]::const_eval::valtrees::eval_to_valtree
  61:     0x7f12e39660ff - <rustc_const_eval[964325fd78f4b8e1]::provide::{closure#0} as core[1a380081440346cb]::ops::function::FnOnce<(rustc_middle[ecc07153edf3c281]::ty::context::TyCtxt, rustc_middle[ecc07153edf3c281]::ty::ParamEnvAnd<rustc_middle[ecc07153edf3c281]::mir::interpret::GlobalId>)>>::call_once
  62:     0x7f12e39660b6 - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::eval_to_valtree::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 24usize]>>
  63:     0x7f12e396606f - <rustc_query_impl[c1633093ec927e0e]::query_impl::eval_to_valtree::dynamic_query::{closure#2} as core[1a380081440346cb]::ops::function::FnOnce<(rustc_middle[ecc07153edf3c281]::ty::context::TyCtxt, rustc_middle[ecc07153edf3c281]::ty::ParamEnvAnd<rustc_middle[ecc07153edf3c281]::mir::interpret::GlobalId>)>>::call_once
  64:     0x7f12e32d9ebe - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::DefaultCache<rustc_middle[ecc07153edf3c281]::ty::ParamEnvAnd<rustc_middle[ecc07153edf3c281]::mir::interpret::GlobalId>, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  65:     0x7f12e32d9860 - rustc_query_impl[c1633093ec927e0e]::query_impl::eval_to_valtree::get_query_non_incr::__rust_end_short_backtrace
  66:     0x7f12e3377949 - rustc_middle[ecc07153edf3c281]::query::plumbing::query_get_at::<rustc_query_system[b257ee99c2874caa]::query::caches::DefaultCache<rustc_middle[ecc07153edf3c281]::ty::ParamEnvAnd<rustc_middle[ecc07153edf3c281]::mir::interpret::GlobalId>, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 24usize]>>>
  67:     0x7f12e3376319 - <rustc_middle[ecc07153edf3c281]::ty::context::TyCtxt>::const_eval_global_id_for_typeck
  68:     0x7f12e33748c3 - <rustc_middle[ecc07153edf3c281]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
  69:     0x7f12e3374624 - <rustc_middle[ecc07153edf3c281]::ty::consts::Const>::eval
  70:     0x7f12e33bf4f7 - <rustc_trait_selection[bf98a35716bfd7e5]::traits::normalize::AssocTypeNormalizer as rustc_type_ir[8d868667529acadd]::fold::TypeFolder<rustc_middle[ecc07153edf3c281]::ty::context::TyCtxt>>::fold_const
  71:     0x7f12e33be85f - <&rustc_middle[ecc07153edf3c281]::ty::list::RawList<(), rustc_middle[ecc07153edf3c281]::ty::generic_args::GenericArg> as rustc_type_ir[8d868667529acadd]::fold::TypeFoldable<rustc_middle[ecc07153edf3c281]::ty::context::TyCtxt>>::try_fold_with::<rustc_trait_selection[bf98a35716bfd7e5]::traits::normalize::AssocTypeNormalizer>
  72:     0x7f12e2f26203 - <rustc_hir_typeck[624c394323d1dd51]::fn_ctxt::FnCtxt>::normalize::<&rustc_middle[ecc07153edf3c281]::ty::list::RawList<(), rustc_middle[ecc07153edf3c281]::ty::generic_args::GenericArg>>
  73:     0x7f12e2f16874 - <rustc_hir_typeck[624c394323d1dd51]::fn_ctxt::FnCtxt>::instantiate_value_path
  74:     0x7f12e2f0ee0e - <rustc_hir_typeck[624c394323d1dd51]::fn_ctxt::FnCtxt>::check_expr_path
  75:     0x7f12e37636f6 - <rustc_hir_typeck[624c394323d1dd51]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  76:     0x7f12e3764676 - <rustc_hir_typeck[624c394323d1dd51]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  77:     0x7f12e375f5fe - <rustc_hir_typeck[624c394323d1dd51]::fn_ctxt::FnCtxt>::check_block_with_expected
  78:     0x7f12e3764bad - <rustc_hir_typeck[624c394323d1dd51]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  79:     0x7f12e2f039e7 - rustc_hir_typeck[624c394323d1dd51]::check::check_fn
  80:     0x7f12e3562bfd - rustc_hir_typeck[624c394323d1dd51]::typeck
  81:     0x7f12e35618cf - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>
  82:     0x7f12e2d47aeb - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::VecCache<rustc_span[4d50fd03223eefaa]::def_id::LocalDefId, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  83:     0x7f12e2d474e5 - rustc_query_impl[c1633093ec927e0e]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  84:     0x7f12e35cc677 - rustc_hir_analysis[be96d916f40dad1b]::check_crate
  85:     0x7f12e368062b - rustc_interface[c31201428b712578]::passes::analysis
  86:     0x7f12e3680025 - rustc_query_impl[c1633093ec927e0e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c1633093ec927e0e]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 1usize]>>
  87:     0x7f12e3952622 - rustc_query_system[b257ee99c2874caa]::query::plumbing::try_execute_query::<rustc_query_impl[c1633093ec927e0e]::DynamicConfig<rustc_query_system[b257ee99c2874caa]::query::caches::SingleCache<rustc_middle[ecc07153edf3c281]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[c1633093ec927e0e]::plumbing::QueryCtxt, false>
  88:     0x7f12e39523cf - rustc_query_impl[c1633093ec927e0e]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  89:     0x7f12e37ff24d - rustc_interface[c31201428b712578]::interface::run_compiler::<core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>, rustc_driver_impl[ce01f96e2e949677]::run_compiler::{closure#0}>::{closure#1}
  90:     0x7f12e3934869 - std[fba9fafec3bdacf8]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[c31201428b712578]::util::run_in_thread_with_globals<rustc_interface[c31201428b712578]::interface::run_compiler<core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>, rustc_driver_impl[ce01f96e2e949677]::run_compiler::{closure#0}>::{closure#1}, core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>>
  91:     0x7f12e393466a - <<std[fba9fafec3bdacf8]::thread::Builder>::spawn_unchecked_<rustc_interface[c31201428b712578]::util::run_in_thread_with_globals<rustc_interface[c31201428b712578]::interface::run_compiler<core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>, rustc_driver_impl[ce01f96e2e949677]::run_compiler::{closure#0}>::{closure#1}, core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[1a380081440346cb]::result::Result<(), rustc_span[4d50fd03223eefaa]::ErrorGuaranteed>>::{closure#2} as core[1a380081440346cb]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  92:     0x7f12de784e3b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hdf5fcef8be77a431
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2063:9
  93:     0x7f12de784e3b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8e8c5ceee46ee198
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/alloc/src/boxed.rs:2063:9
  94:     0x7f12de784e3b - std::sys::pal::unix::thread::Thread::new::thread_start::hb85dbfa54ba503d6
                               at /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/sys/pal/unix/thread.rs:108:17
  95:     0x7f12de692609 - start_thread
  96:     0x7f12de5b5353 - clone
  97:                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: rustc 1.80.1 (3f5fd8dd4 2024-08-06) 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:
#0 [typeck] type-checking `<impl at src/lib.rs:8:1: 8:44>::collate::{constant#0}`
#1 [check_match] match-checking `<impl at src/lib.rs:8:1: 8:44>::collate::{constant#0}`
end of query stack
For more information about this error, try `rustc --explain E0308`.
warning: `playground` (lib) generated 1 warning
error: could not compile `playground` (lib) due to 1 previous error; 1 warning emitted

[matthiaskrgr]

#125958