ICE: rustdoc: `Could not find associated const on trait`

[matthiaskrgr]

Code

./src/test/ui/generic-associated-types/parse/trait-path-type-error-once-implemented.rs

trait X {
    type Y<'a>;
}

const _: () = {
  fn f2<'a>(arg : Box<dyn X<Y<1> = &'a ()>>) {}
      //~^ ERROR this associated type takes 1 lifetime argument but 0 lifetime arguments
      //~| ERROR this associated type takes 0 generic arguments but 1 generic argument
};

fn main() {}

Meta

rustc --version --verbose:

rustc 1.68.0-nightly (8a97b4812 2022-12-22)
binary: rustc
commit-hash: 8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9
commit-date: 2022-12-22
host: x86_64-unknown-linux-gnu
release: 1.68.0-nightly
LLVM version: 15.0.6

Error output

<output>

Backtrace

thread 'rustc' panicked at 'Error', src/librustdoc/clean/mod.rs:1856:25
stack backtrace:
   0:     0x7f3c8ab65a7a - std::backtrace_rs::backtrace::libunwind::trace::h250f5acc74207c14
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f3c8ab65a7a - std::backtrace_rs::backtrace::trace_unsynchronized::h8b2cc87ea209f556
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f3c8ab65a7a - std::sys_common::backtrace::_print_fmt::he79fe9ac625765a8
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f3c8ab65a7a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1b8cfd7233c5cf16
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f3c8abc87ae - core::fmt::write::hf4356953bb6287e9
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f3c8ab55e45 - std::io::Write::write_fmt::h777ff3ca89a9d1e9
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/io/mod.rs:1682:15
   6:     0x7f3c8ab65845 - std::sys_common::backtrace::_print::h30bd0c5979c85003
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f3c8ab65845 - std::sys_common::backtrace::print::he11670adbc4564f8
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f3c8ab6858f - std::panicking::default_hook::{{closure}}::h2b850e11ab02b140
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/panicking.rs:267:22
   9:     0x7f3c8ab682cb - std::panicking::default_hook::h5e8af7c8d5de5af1
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/panicking.rs:286:9
  10:     0x7f3c8de4d151 - rustc_driver[b1659719c04a24c8]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f3c8ab68dcd - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h3e73a49254418f01
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/alloc/src/boxed.rs:2032:9
  12:     0x7f3c8ab68dcd - std::panicking::rust_panic_with_hook::hfdcd0659796f0493
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/panicking.rs:692:13
  13:     0x7f3c8ab68b02 - std::panicking::begin_panic_handler::{{closure}}::h1da0d3ec43a330b4
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/panicking.rs:577:13
  14:     0x7f3c8ab65f2c - std::sys_common::backtrace::__rust_end_short_backtrace::hda54127fbb19e796
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:137:18
  15:     0x7f3c8ab68852 - rust_begin_unwind
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/panicking.rs:575:5
  16:     0x7f3c8abc5193 - core::panicking::panic_fmt::h757cae3820c90eb4
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/core/src/panicking.rs:64:14
  17:     0x564000a003ef - rustdoc[b533b40e318b555]::clean::clean_middle_ty
  18:     0x5640009cf74f - rustdoc[b533b40e318b555]::clean::clean_const
  19:     0x564000953b13 - <core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::GenericArg>, rustdoc[b533b40e318b555]::clean::clean_generic_args::{closure#1}> as core[838cd329d32ba501]::iter::traits::iterator::Iterator>::fold::<(), core[838cd329d32ba501]::iter::traits::iterator::Iterator::for_each::call<rustdoc[b533b40e318b555]::clean::types::GenericArg, <alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::GenericArg>>::extend_trusted<core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::GenericArg>, rustdoc[b533b40e318b555]::clean::clean_generic_args::{closure#1}>>::{closure#0}>::{closure#0}>
  20:     0x564000795d5e - <alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::GenericArg> as alloc[225e6e9bb7b947dc]::vec::spec_from_iter::SpecFromIter<rustdoc[b533b40e318b555]::clean::types::GenericArg, core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::GenericArg>, rustdoc[b533b40e318b555]::clean::clean_generic_args::{closure#1}>>>::from_iter
  21:     0x5640009db7a3 - rustdoc[b533b40e318b555]::clean::clean_generic_args
  22:     0x5640009db849 - rustdoc[b533b40e318b555]::clean::clean_generic_args
  23:     0x5640009c5c7d - <thin_vec[c3567fdbde1f8e7]::ThinVec<rustdoc[b533b40e318b555]::clean::types::PathSegment> as core[838cd329d32ba501]::iter::traits::collect::FromIterator<rustdoc[b533b40e318b555]::clean::types::PathSegment>>::from_iter::<core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::PathSegment>, rustdoc[b533b40e318b555]::clean::clean_path::{closure#0}>>
  24:     0x5640009d61e0 - rustdoc[b533b40e318b555]::clean::clean_poly_trait_ref
  25:     0x56400079befe - <alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::PolyTrait> as alloc[225e6e9bb7b947dc]::vec::spec_from_iter::SpecFromIter<rustdoc[b533b40e318b555]::clean::types::PolyTrait, core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::PolyTraitRef>, rustdoc[b533b40e318b555]::clean::clean_ty::{closure#2}>>>::from_iter
  26:     0x5640009da42e - rustdoc[b533b40e318b555]::clean::clean_ty
  27:     0x564000953aca - <core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::GenericArg>, rustdoc[b533b40e318b555]::clean::clean_generic_args::{closure#1}> as core[838cd329d32ba501]::iter::traits::iterator::Iterator>::fold::<(), core[838cd329d32ba501]::iter::traits::iterator::Iterator::for_each::call<rustdoc[b533b40e318b555]::clean::types::GenericArg, <alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::GenericArg>>::extend_trusted<core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::GenericArg>, rustdoc[b533b40e318b555]::clean::clean_generic_args::{closure#1}>>::{closure#0}>::{closure#0}>
  28:     0x564000795d5e - <alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::GenericArg> as alloc[225e6e9bb7b947dc]::vec::spec_from_iter::SpecFromIter<rustdoc[b533b40e318b555]::clean::types::GenericArg, core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::GenericArg>, rustdoc[b533b40e318b555]::clean::clean_generic_args::{closure#1}>>>::from_iter
  29:     0x5640009db7a3 - rustdoc[b533b40e318b555]::clean::clean_generic_args
  30:     0x5640009c5c7d - <thin_vec[c3567fdbde1f8e7]::ThinVec<rustdoc[b533b40e318b555]::clean::types::PathSegment> as core[838cd329d32ba501]::iter::traits::collect::FromIterator<rustdoc[b533b40e318b555]::clean::types::PathSegment>>::from_iter::<core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::PathSegment>, rustdoc[b533b40e318b555]::clean::clean_path::{closure#0}>>
  31:     0x5640009d910b - rustdoc[b533b40e318b555]::clean::clean_qpath
  32:     0x5640009da54c - rustdoc[b533b40e318b555]::clean::clean_ty
  33:     0x56400079b179 - <alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::Argument> as alloc[225e6e9bb7b947dc]::vec::spec_from_iter::SpecFromIter<rustdoc[b533b40e318b555]::clean::types::Argument, core[838cd329d32ba501]::iter::adapters::map::Map<core[838cd329d32ba501]::iter::adapters::enumerate::Enumerate<core[838cd329d32ba501]::slice::iter::Iter<rustc_hir[cdef261b456c4bde]::hir::Ty>>, rustdoc[b533b40e318b555]::clean::clean_args_from_types_and_body_id::{closure#0}>>>::from_iter
  34:     0x5640006d6a29 - rustdoc[b533b40e318b555]::clean::utils::enter_impl_trait::<rustdoc[b533b40e318b555]::clean::clean_function::{closure#0}, (rustdoc[b533b40e318b555]::clean::types::Generics, rustdoc[b533b40e318b555]::clean::types::FnDecl)>
  35:     0x5640009d513b - rustdoc[b533b40e318b555]::clean::clean_fn_or_proc_macro
  36:     0x56400091d603 - <rustdoc[b533b40e318b555]::core::DocContext>::with_param_env::<alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::Item>, rustdoc[b533b40e318b555]::clean::clean_maybe_renamed_item::{closure#1}>
  37:     0x5640009c835c - <&mut rustdoc[b533b40e318b555]::clean::clean_doc_module::{closure#2} as core[838cd329d32ba501]::ops::function::FnOnce<(&(&rustc_hir[cdef261b456c4bde]::hir::Item, core[838cd329d32ba501]::option::Option<rustc_span[506ca92461b63806]::symbol::Symbol>, core[838cd329d32ba501]::option::Option<rustc_hir[cdef261b456c4bde]::hir_id::HirId>),)>>::call_once
  38:     0x56400078c114 - <alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::Item> as alloc[225e6e9bb7b947dc]::vec::spec_extend::SpecExtend<rustdoc[b533b40e318b555]::clean::types::Item, core[838cd329d32ba501]::iter::adapters::flatten::FlatMap<core[838cd329d32ba501]::slice::iter::Iter<(&rustc_hir[cdef261b456c4bde]::hir::Item, core[838cd329d32ba501]::option::Option<rustc_span[506ca92461b63806]::symbol::Symbol>, core[838cd329d32ba501]::option::Option<rustc_hir[cdef261b456c4bde]::hir_id::HirId>)>, alloc[225e6e9bb7b947dc]::vec::Vec<rustdoc[b533b40e318b555]::clean::types::Item>, rustdoc[b533b40e318b555]::clean::clean_doc_module::{closure#2}>>>::spec_extend
  39:     0x5640009ce988 - rustdoc[b533b40e318b555]::clean::clean_doc_module
  40:     0x5640006d2b61 - rustdoc[b533b40e318b555]::clean::utils::krate
  41:     0x5640008934f4 - <rustc_session[9a79971eab3e0f2f]::session::Session>::time::<rustdoc[b533b40e318b555]::clean::types::Crate, rustdoc[b533b40e318b555]::core::run_global_ctxt::{closure#4}>
  42:     0x5640009222b7 - rustdoc[b533b40e318b555]::core::run_global_ctxt
  43:     0x564000894844 - <rustc_interface[27db4dcdd626da73]::passes::QueryContext>::enter::<rustdoc[b533b40e318b555]::main_args::{closure#1}::{closure#0}::{closure#1}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>
  44:     0x5640006e612a - <rustc_interface[27db4dcdd626da73]::interface::Compiler>::enter::<rustdoc[b533b40e318b555]::main_args::{closure#1}::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>
  45:     0x56400082c20a - rustc_span[506ca92461b63806]::with_source_map::<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustc_interface[27db4dcdd626da73]::interface::run_compiler<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustdoc[b533b40e318b555]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  46:     0x5640006b10b5 - <scoped_tls[57eb591005101a44]::ScopedKey<rustc_span[506ca92461b63806]::SessionGlobals>>::set::<rustc_interface[27db4dcdd626da73]::interface::run_compiler<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustdoc[b533b40e318b555]::main_args::{closure#1}>::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>
  47:     0x56400083e900 - std[1a5a851d154403c1]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[27db4dcdd626da73]::util::run_in_thread_pool_with_globals<rustc_interface[27db4dcdd626da73]::interface::run_compiler<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustdoc[b533b40e318b555]::main_args::{closure#1}>::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>
  48:     0x56400099c02f - <<std[1a5a851d154403c1]::thread::Builder>::spawn_unchecked_<rustc_interface[27db4dcdd626da73]::util::run_in_thread_pool_with_globals<rustc_interface[27db4dcdd626da73]::interface::run_compiler<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustdoc[b533b40e318b555]::main_args::{closure#1}>::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>::{closure#1} as core[838cd329d32ba501]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  49:     0x7f3c8ab72dc3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8220a33137e05636
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/alloc/src/boxed.rs:2000:9
  50:     0x7f3c8ab72dc3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hcde99a22c299cd7f
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/alloc/src/boxed.rs:2000:9
  51:     0x7f3c8ab72dc3 - std::sys::unix::thread::Thread::new::thread_start::h608d02a3e5faa1ee
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys/unix/thread.rs:108:17
  52:     0x7f3c8a8d98fd - <unknown>
  53:     0x7f3c8a95ba60 - <unknown>
  54:                0x0 - <unknown>

error: internal compiler error: unexpected panic

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 1.68.0-nightly (8a97b4812 2022-12-22) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: Could not find associated const on trait
  |
  = note: delayed at compiler/rustc_hir_analysis/src/collect/type_of.rs:509:29

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1610:13
stack backtrace:
   0:     0x7f3c8ab65a7a - std::backtrace_rs::backtrace::libunwind::trace::h250f5acc74207c14
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f3c8ab65a7a - std::backtrace_rs::backtrace::trace_unsynchronized::h8b2cc87ea209f556
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f3c8ab65a7a - std::sys_common::backtrace::_print_fmt::he79fe9ac625765a8
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f3c8ab65a7a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1b8cfd7233c5cf16
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f3c8abc87ae - core::fmt::write::hf4356953bb6287e9
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f3c8ab55e45 - std::io::Write::write_fmt::h777ff3ca89a9d1e9
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/io/mod.rs:1682:15
   6:     0x7f3c8ab65845 - std::sys_common::backtrace::_print::h30bd0c5979c85003
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f3c8ab65845 - std::sys_common::backtrace::print::he11670adbc4564f8
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f3c8ab6858f - std::panicking::default_hook::{{closure}}::h2b850e11ab02b140
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/panicking.rs:267:22
   9:     0x7f3c8ab682cb - std::panicking::default_hook::h5e8af7c8d5de5af1
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/panicking.rs:286:9
  10:     0x7f3c8de4d151 - rustc_driver[b1659719c04a24c8]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f3c8ab68dcd - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h3e73a49254418f01
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/alloc/src/boxed.rs:2032:9
  12:     0x7f3c8ab68dcd - std::panicking::rust_panic_with_hook::hfdcd0659796f0493
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/panicking.rs:692:13
  13:     0x7f3c8de860a1 - std[1a5a851d154403c1]::panicking::begin_panic::<rustc_errors[f3b4af3fda1898a3]::ExplicitBug>::{closure#0}
  14:     0x7f3c8de84976 - std[1a5a851d154403c1]::sys_common::backtrace::__rust_end_short_backtrace::<std[1a5a851d154403c1]::panicking::begin_panic<rustc_errors[f3b4af3fda1898a3]::ExplicitBug>::{closure#0}, !>
  15:     0x7f3c8de626e6 - std[1a5a851d154403c1]::panicking::begin_panic::<rustc_errors[f3b4af3fda1898a3]::ExplicitBug>
  16:     0x7f3c8de81e46 - std[1a5a851d154403c1]::panic::panic_any::<rustc_errors[f3b4af3fda1898a3]::ExplicitBug>
  17:     0x7f3c8d368f96 - <rustc_errors[f3b4af3fda1898a3]::HandlerInner>::flush_delayed::<alloc[225e6e9bb7b947dc]::vec::Vec<rustc_errors[f3b4af3fda1898a3]::diagnostic::Diagnostic>, &str>
  18:     0x7f3c8d36829b - <rustc_errors[f3b4af3fda1898a3]::HandlerInner as core[838cd329d32ba501]::ops::drop::Drop>::drop
  19:     0x564000a1333e - core[838cd329d32ba501]::ptr::drop_in_place::<rustc_session[9a79971eab3e0f2f]::parse::ParseSess>
  20:     0x564000a14c9f - core[838cd329d32ba501]::ptr::drop_in_place::<rustc_session[9a79971eab3e0f2f]::session::Session>
  21:     0x564000834b2d - core[838cd329d32ba501]::ptr::drop_in_place::<rustc_interface[27db4dcdd626da73]::interface::Compiler>
  22:     0x56400082c3c4 - rustc_span[506ca92461b63806]::with_source_map::<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustc_interface[27db4dcdd626da73]::interface::run_compiler<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustdoc[b533b40e318b555]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  23:     0x5640006b10b5 - <scoped_tls[57eb591005101a44]::ScopedKey<rustc_span[506ca92461b63806]::SessionGlobals>>::set::<rustc_interface[27db4dcdd626da73]::interface::run_compiler<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustdoc[b533b40e318b555]::main_args::{closure#1}>::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>
  24:     0x56400083e900 - std[1a5a851d154403c1]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[27db4dcdd626da73]::util::run_in_thread_pool_with_globals<rustc_interface[27db4dcdd626da73]::interface::run_compiler<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustdoc[b533b40e318b555]::main_args::{closure#1}>::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>
  25:     0x56400099c02f - <<std[1a5a851d154403c1]::thread::Builder>::spawn_unchecked_<rustc_interface[27db4dcdd626da73]::util::run_in_thread_pool_with_globals<rustc_interface[27db4dcdd626da73]::interface::run_compiler<core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>, rustdoc[b533b40e318b555]::main_args::{closure#1}>::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[838cd329d32ba501]::result::Result<(), rustc_errors[f3b4af3fda1898a3]::ErrorGuaranteed>>::{closure#1} as core[838cd329d32ba501]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  26:     0x7f3c8ab72dc3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8220a33137e05636
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/alloc/src/boxed.rs:2000:9
  27:     0x7f3c8ab72dc3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hcde99a22c299cd7f
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/alloc/src/boxed.rs:2000:9
  28:     0x7f3c8ab72dc3 - std::sys::unix::thread::Thread::new::thread_start::h608d02a3e5faa1ee
                               at /rustc/8a97b4812a7a46bb5206487c2455b9c5bfcbd1b9/library/std/src/sys/unix/thread.rs:108:17
  29:     0x7f3c8a8d98fd - <unknown>
  30:     0x7f3c8a95ba60 - <unknown>
  31:                0x0 - <unknown>

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 1.68.0-nightly (8a97b4812 2022-12-22) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
thread panicked while panicking. aborting.
[1]    3474971 IOT instruction (core dumped)  rustdoc

[matthiaskrgr]

Regression in cce9e72

[JohnTitor]

Triage: This is no longer ICE since nightly-2023-01-21, marking as E-needs-test.

[megakorre]

Tried to add a test. But it seems it had time to regress again. #107000
Edit: there was a revert that "fixed" it #107083 and the another attempt at it after it seems.

searched nightlies: from nightly-2023-01-29 to nightly-2023-02-20
regressed nightly: nightly-2023-02-04
searched commit range: https://github.com/rust-lang/rust/compare/f3126500f25114ba4e0ac3e76694dd45a22de56d...658fad6c5506f41c35b64fb1a22ceb0992697ff3
regressed commit: https://github.com/rust-lang/rust/commit/6c991b07403a3234dd1ec0ac973b8ef97055e605

This ICE happens without the const block. Maybe the regression is just about that it is now walking const blocks but the actual ICE is something else.

[megakorre]

The code without the const block.

trait X {
    type Y<'a>;
}
fn f2<'a>(arg : Box<dyn X<Y<1> = &'a ()>>) {}

Has been causing ICE in rustdoc rendering (clean) since GATs rustdoc rendering was introduced in #94009