ICE: rustdoc: `impl Vec<T>` where `T` is also a `fn` name

[matthiaskrgr]

Code

impl Vec<lol> {}

fn lol() {}

Meta

rustc --version --verbose:

rustdoc 1.68.0-nightly (b70baa4f9 2022-12-14)
binary: rustdoc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 1.68.0-nightly
LLVM version: 15.0.6

Error output

<output>

Backtrace

error[E0747]: constant provided when a type was expected
 --> a0fbae68f68b1239dd54b8fc4ada4c0597515cea.rs:1:10
  |
1 | impl Vec<lol> {}
  |          ^^^
  |
  = help: `lol` is a function item, not a type
  = help: function item types cannot be named directly

thread 'rustc' panicked at 'Error', src/librustdoc/clean/mod.rs:1856:25
stack backtrace:
   0:     0x7f8347f657da - std::backtrace_rs::backtrace::libunwind::trace::h58c649c53097142b
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f8347f657da - std::backtrace_rs::backtrace::trace_unsynchronized::h8a2218341115550a
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f8347f657da - std::sys_common::backtrace::_print_fmt::hea4b2f7f6d570ca4
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f8347f657da - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8d8d34f4e85c6a60
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f8347fc82ee - core::fmt::write::haf2065fc0d3659f4
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f8347f55b65 - std::io::Write::write_fmt::h6dce18c304ee54a2
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/io/mod.rs:1682:15
   6:     0x7f8347f655a5 - std::sys_common::backtrace::_print::hec602170f4d3e048
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f8347f655a5 - std::sys_common::backtrace::print::h8aa4a47604c83c88
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f8347f682ef - std::panicking::default_hook::{{closure}}::h68a2f001ac3644c4
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/panicking.rs:267:22
   9:     0x7f8347f6802b - std::panicking::default_hook::h4861c4cf633cd613
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/panicking.rs:286:9
  10:     0x7f8347f68b0c - std::panicking::rust_panic_with_hook::h404216ffd42d1a9f
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/panicking.rs:688:13
  11:     0x7f8347f68862 - std::panicking::begin_panic_handler::{{closure}}::hbfc6e95ed3b74164
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/panicking.rs:577:13
  12:     0x7f8347f65c8c - std::sys_common::backtrace::__rust_end_short_backtrace::h6c2b4fdde46f911c
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x7f8347f685b2 - rust_begin_unwind
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/panicking.rs:575:5
  14:     0x7f8347fc4cd3 - core::panicking::panic_fmt::h52720972d063b41a
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/core/src/panicking.rs:64:14
  15:     0x56323bb7b5ff - rustdoc[f79df397caf8daff]::clean::clean_middle_ty
  16:     0x56323bb4c17f - rustdoc[f79df397caf8daff]::clean::clean_const
  17:     0x56323bad6063 - <core[a183604df3a39924]::iter::adapters::map::Map<core[a183604df3a39924]::slice::iter::Iter<rustc_hir[23c7b9dd50e700e0]::hir::GenericArg>, rustdoc[f79df397caf8daff]::clean::clean_generic_args::{closure#1}> as core[a183604df3a39924]::iter::traits::iterator::Iterator>::fold::<(), core[a183604df3a39924]::iter::traits::iterator::Iterator::for_each::call<rustdoc[f79df397caf8daff]::clean::types::GenericArg, <alloc[51c757b3bc4bb1d4]::vec::Vec<rustdoc[f79df397caf8daff]::clean::types::GenericArg>>::extend_trusted<core[a183604df3a39924]::iter::adapters::map::Map<core[a183604df3a39924]::slice::iter::Iter<rustc_hir[23c7b9dd50e700e0]::hir::GenericArg>, rustdoc[f79df397caf8daff]::clean::clean_generic_args::{closure#1}>>::{closure#0}>::{closure#0}>
  18:     0x56323b9515fe - <alloc[51c757b3bc4bb1d4]::vec::Vec<rustdoc[f79df397caf8daff]::clean::types::GenericArg> as alloc[51c757b3bc4bb1d4]::vec::spec_from_iter::SpecFromIter<rustdoc[f79df397caf8daff]::clean::types::GenericArg, core[a183604df3a39924]::iter::adapters::map::Map<core[a183604df3a39924]::slice::iter::Iter<rustc_hir[23c7b9dd50e700e0]::hir::GenericArg>, rustdoc[f79df397caf8daff]::clean::clean_generic_args::{closure#1}>>>::from_iter
  19:     0x56323bb582d3 - rustdoc[f79df397caf8daff]::clean::clean_generic_args
  20:     0x56323bb4064d - <thin_vec[95be0f790a1e30cb]::ThinVec<rustdoc[f79df397caf8daff]::clean::types::PathSegment> as core[a183604df3a39924]::iter::traits::collect::FromIterator<rustdoc[f79df397caf8daff]::clean::types::PathSegment>>::from_iter::<core[a183604df3a39924]::iter::adapters::map::Map<core[a183604df3a39924]::slice::iter::Iter<rustc_hir[23c7b9dd50e700e0]::hir::PathSegment>, rustdoc[f79df397caf8daff]::clean::clean_path::{closure#0}>>
  21:     0x56323bb55c3b - rustdoc[f79df397caf8daff]::clean::clean_qpath
  22:     0x56323bb5707c - rustdoc[f79df397caf8daff]::clean::clean_ty
  23:     0x56323bb58e83 - rustdoc[f79df397caf8daff]::clean::clean_impl
  24:     0x56323ba78865 - <rustdoc[f79df397caf8daff]::core::DocContext>::with_param_env::<alloc[51c757b3bc4bb1d4]::vec::Vec<rustdoc[f79df397caf8daff]::clean::types::Item>, rustdoc[f79df397caf8daff]::clean::clean_maybe_renamed_item::{closure#1}>
  25:     0x56323bb445cc - <&mut rustdoc[f79df397caf8daff]::clean::clean_doc_module::{closure#2} as core[a183604df3a39924]::ops::function::FnOnce<(&(&rustc_hir[23c7b9dd50e700e0]::hir::Item, core[a183604df3a39924]::option::Option<rustc_span[8d98255f5ee7a7e8]::symbol::Symbol>, core[a183604df3a39924]::option::Option<rustc_hir[23c7b9dd50e700e0]::hir_id::HirId>),)>>::call_once
  26:     0x56323b9479d4 - <alloc[51c757b3bc4bb1d4]::vec::Vec<rustdoc[f79df397caf8daff]::clean::types::Item> as alloc[51c757b3bc4bb1d4]::vec::spec_extend::SpecExtend<rustdoc[f79df397caf8daff]::clean::types::Item, core[a183604df3a39924]::iter::adapters::flatten::FlatMap<core[a183604df3a39924]::slice::iter::Iter<(&rustc_hir[23c7b9dd50e700e0]::hir::Item, core[a183604df3a39924]::option::Option<rustc_span[8d98255f5ee7a7e8]::symbol::Symbol>, core[a183604df3a39924]::option::Option<rustc_hir[23c7b9dd50e700e0]::hir_id::HirId>)>, alloc[51c757b3bc4bb1d4]::vec::Vec<rustdoc[f79df397caf8daff]::clean::types::Item>, rustdoc[f79df397caf8daff]::clean::clean_doc_module::{closure#2}>>>::spec_extend
  27:     0x56323bb4b3c2 - rustdoc[f79df397caf8daff]::clean::clean_doc_module
  28:     0x56323b858dc1 - rustdoc[f79df397caf8daff]::clean::utils::krate
  29:     0x56323ba0b4d4 - <rustc_session[f809e505f670defe]::session::Session>::time::<rustdoc[f79df397caf8daff]::clean::types::Crate, rustdoc[f79df397caf8daff]::core::run_global_ctxt::{closure#4}>
  30:     0x56323ba7d547 - rustdoc[f79df397caf8daff]::core::run_global_ctxt
  31:     0x56323ba0c954 - <rustc_interface[59cd32f5a8db8a5b]::passes::QueryContext>::enter::<rustdoc[f79df397caf8daff]::main_args::{closure#1}::{closure#0}::{closure#1}, core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>>
  32:     0x56323b8cd5fa - <rustc_interface[59cd32f5a8db8a5b]::interface::Compiler>::enter::<rustdoc[f79df397caf8daff]::main_args::{closure#1}::{closure#0}, core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>>
  33:     0x56323b9a4b3a - rustc_span[8d98255f5ee7a7e8]::with_source_map::<core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>, rustc_interface[59cd32f5a8db8a5b]::interface::run_compiler<core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>, rustdoc[f79df397caf8daff]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  34:     0x56323b833795 - <scoped_tls[d2f689311b6a895]::ScopedKey<rustc_span[8d98255f5ee7a7e8]::SessionGlobals>>::set::<rustc_interface[59cd32f5a8db8a5b]::interface::run_compiler<core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>, rustdoc[f79df397caf8daff]::main_args::{closure#1}>::{closure#0}, core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>>
  35:     0x56323b9b78a0 - std[f8e68897caeb81ab]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[59cd32f5a8db8a5b]::util::run_in_thread_pool_with_globals<rustc_interface[59cd32f5a8db8a5b]::interface::run_compiler<core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>, rustdoc[f79df397caf8daff]::main_args::{closure#1}>::{closure#0}, core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>>
  36:     0x56323bb4102f - <<std[f8e68897caeb81ab]::thread::Builder>::spawn_unchecked_<rustc_interface[59cd32f5a8db8a5b]::util::run_in_thread_pool_with_globals<rustc_interface[59cd32f5a8db8a5b]::interface::run_compiler<core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>, rustdoc[f79df397caf8daff]::main_args::{closure#1}>::{closure#0}, core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[a183604df3a39924]::result::Result<(), rustc_errors[646af11ffc335ad2]::ErrorGuaranteed>>::{closure#1} as core[a183604df3a39924]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x7f8347f72903 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hefb6b2db81441f4e
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/alloc/src/boxed.rs:2000:9
  38:     0x7f8347f72903 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h27d69019d3964068
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/alloc/src/boxed.rs:2000:9
  39:     0x7f8347f72903 - std::sys::unix::thread::Thread::new::thread_start::hed02738834385cbc
                               at /rustc/b70baa4f922a1809d79caeaeb902800c3be283b9/library/std/src/sys/unix/thread.rs:108:17
  40:     0x7f8347d058fd - <unknown>
  41:     0x7f8347d87a60 - <unknown>
  42:                0x0 - <unknown>
error: aborting due to previous error

For more information about this error, try `rustc --explain E0747`.

[camelid]

Hmm, rustdoc shouldn't be running if there was a type error in a type signature...