ICE: rustdoc on garbage code

[matthiaskrgr]

Code

impl Vec< br##"*.."## > {}

Meta

rustc --version --verbose:

rustdoc 1.67.0-nightly (53e4b9dd7 2022-12-04)
binary: rustdoc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 1.67.0-nightly
LLVM version: 15.0.4

Error output

<output>

Backtrace

error[E0747]: constant provided when a type was expected
 --> ./05601e0a932cb411d163bdd90c4ea623510a92ce.rs:1:11
  |
1 | impl Vec< br##"*.."## > {}
  |           ^^^^^^^^^^^

thread 'rustc' panicked at 'Error', src/librustdoc/clean/mod.rs:1812:25
stack backtrace:
   0:     0x7f6faa9662da - std::backtrace_rs::backtrace::libunwind::trace::h217eb04aed2c45de
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f6faa9662da - std::backtrace_rs::backtrace::trace_unsynchronized::h8d7ebe2490fc8887
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f6faa9662da - std::sys_common::backtrace::_print_fmt::hf5be7add3e3c061b
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f6faa9662da - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hc3f0b6fc09e1404b
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f6faa9c8ece - core::fmt::write::h21bd73c842f4e089
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f6faa956795 - std::io::Write::write_fmt::hc308562d08004f3e
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/io/mod.rs:1682:15
   6:     0x7f6faa9660a5 - std::sys_common::backtrace::_print::h35dbc8fac7f76168
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f6faa9660a5 - std::sys_common::backtrace::print::h73d53422718fe2c6
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f6faa968def - std::panicking::default_hook::{{closure}}::h48456de670413439
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/panicking.rs:267:22
   9:     0x7f6faa968b2b - std::panicking::default_hook::h133845cf05f47840
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/panicking.rs:286:9
  10:     0x7f6faa96960c - std::panicking::rust_panic_with_hook::hb428246b31e531d9
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/panicking.rs:688:13
  11:     0x7f6faa969362 - std::panicking::begin_panic_handler::{{closure}}::ha15618c185ebb8be
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/panicking.rs:577:13
  12:     0x7f6faa96678c - std::sys_common::backtrace::__rust_end_short_backtrace::ha22c9026619d93a1
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x7f6faa9690b2 - rust_begin_unwind
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/panicking.rs:575:5
  14:     0x7f6faa9c58b3 - core::panicking::panic_fmt::hee7675342c7d8922
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/core/src/panicking.rs:64:14
  15:     0x56202b3490ca - rustdoc[37fab5a146ca0381]::clean::clean_middle_ty
  16:     0x56202b33c6d7 - rustdoc[37fab5a146ca0381]::clean::clean_const
  17:     0x56202b3b3f83 - <core[e1ff35b71d1701d9]::iter::adapters::map::Map<core[e1ff35b71d1701d9]::slice::iter::Iter<rustc_hir[d215fbc8439c4c5e]::hir::GenericArg>, rustdoc[37fab5a146ca0381]::clean::clean_generic_args::{closure#1}> as core[e1ff35b71d1701d9]::iter::traits::iterator::Iterator>::fold::<(), core[e1ff35b71d1701d9]::iter::traits::iterator::Iterator::for_each::call<rustdoc[37fab5a146ca0381]::clean::types::GenericArg, <alloc[279ad31ef126e141]::vec::Vec<rustdoc[37fab5a146ca0381]::clean::types::GenericArg>>::extend_trusted<core[e1ff35b71d1701d9]::iter::adapters::map::Map<core[e1ff35b71d1701d9]::slice::iter::Iter<rustc_hir[d215fbc8439c4c5e]::hir::GenericArg>, rustdoc[37fab5a146ca0381]::clean::clean_generic_args::{closure#1}>>::{closure#0}>::{closure#0}>
  18:     0x56202b16d75e - <alloc[279ad31ef126e141]::vec::Vec<rustdoc[37fab5a146ca0381]::clean::types::GenericArg> as alloc[279ad31ef126e141]::vec::spec_from_iter::SpecFromIter<rustdoc[37fab5a146ca0381]::clean::types::GenericArg, core[e1ff35b71d1701d9]::iter::adapters::map::Map<core[e1ff35b71d1701d9]::slice::iter::Iter<rustc_hir[d215fbc8439c4c5e]::hir::GenericArg>, rustdoc[37fab5a146ca0381]::clean::clean_generic_args::{closure#1}>>>::from_iter
  19:     0x56202b349aaa - rustdoc[37fab5a146ca0381]::clean::clean_generic_args
  20:     0x56202b32777d - <thin_vec[ceaaa807d5cf7a3c]::ThinVec<rustdoc[37fab5a146ca0381]::clean::types::PathSegment> as core[e1ff35b71d1701d9]::iter::traits::collect::FromIterator<rustdoc[37fab5a146ca0381]::clean::types::PathSegment>>::from_iter::<core[e1ff35b71d1701d9]::iter::adapters::map::Map<core[e1ff35b71d1701d9]::slice::iter::Iter<rustc_hir[d215fbc8439c4c5e]::hir::PathSegment>, rustdoc[37fab5a146ca0381]::clean::clean_path::{closure#0}>>
  21:     0x56202b345f5b - rustdoc[37fab5a146ca0381]::clean::clean_qpath
  22:     0x56202b3474ac - rustdoc[37fab5a146ca0381]::clean::clean_ty
  23:     0x56202b34a5e3 - rustdoc[37fab5a146ca0381]::clean::clean_impl
  24:     0x56202b27cf20 - <rustdoc[37fab5a146ca0381]::core::DocContext>::with_param_env::<alloc[279ad31ef126e141]::vec::Vec<rustdoc[37fab5a146ca0381]::clean::types::Item>, rustdoc[37fab5a146ca0381]::clean::clean_maybe_renamed_item::{closure#1}>
  25:     0x56202b33a7e5 - <&mut rustdoc[37fab5a146ca0381]::clean::clean_doc_module::{closure#2} as core[e1ff35b71d1701d9]::ops::function::FnOnce<(&(&rustc_hir[d215fbc8439c4c5e]::hir::Item, core[e1ff35b71d1701d9]::option::Option<rustc_span[323ba4f8bef90746]::symbol::Symbol>, core[e1ff35b71d1701d9]::option::Option<rustc_hir[d215fbc8439c4c5e]::hir_id::HirId>),)>>::call_once
  26:     0x56202b163844 - <alloc[279ad31ef126e141]::vec::Vec<rustdoc[37fab5a146ca0381]::clean::types::Item> as alloc[279ad31ef126e141]::vec::spec_extend::SpecExtend<rustdoc[37fab5a146ca0381]::clean::types::Item, core[e1ff35b71d1701d9]::iter::adapters::flatten::FlatMap<core[e1ff35b71d1701d9]::slice::iter::Iter<(&rustc_hir[d215fbc8439c4c5e]::hir::Item, core[e1ff35b71d1701d9]::option::Option<rustc_span[323ba4f8bef90746]::symbol::Symbol>, core[e1ff35b71d1701d9]::option::Option<rustc_hir[d215fbc8439c4c5e]::hir_id::HirId>)>, alloc[279ad31ef126e141]::vec::Vec<rustdoc[37fab5a146ca0381]::clean::types::Item>, rustdoc[37fab5a146ca0381]::clean::clean_doc_module::{closure#2}>>>::spec_extend
  27:     0x56202b33b962 - rustdoc[37fab5a146ca0381]::clean::clean_doc_module
  28:     0x56202b2395c1 - rustdoc[37fab5a146ca0381]::clean::utils::krate
  29:     0x56202b2f06c4 - <rustc_session[f586d2b4d440cc8a]::session::Session>::time::<rustdoc[37fab5a146ca0381]::clean::types::Crate, rustdoc[37fab5a146ca0381]::core::run_global_ctxt::{closure#4}>
  30:     0x56202b2822e7 - rustdoc[37fab5a146ca0381]::core::run_global_ctxt
  31:     0x56202b2f0acc - <rustc_session[f586d2b4d440cc8a]::session::Session>::time::<(rustdoc[37fab5a146ca0381]::clean::types::Crate, rustdoc[37fab5a146ca0381]::config::RenderOptions, rustdoc[37fab5a146ca0381]::formats::cache::Cache), rustdoc[37fab5a146ca0381]::main_args::{closure#1}::{closure#0}::{closure#1}::{closure#0}>
  32:     0x56202b36349f - <rustc_interface[e2cb08752aecdf39]::passes::QueryContext>::enter::<rustdoc[37fab5a146ca0381]::main_args::{closure#1}::{closure#0}::{closure#1}, core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>>
  33:     0x56202b1f326a - <rustc_interface[e2cb08752aecdf39]::interface::Compiler>::enter::<rustdoc[37fab5a146ca0381]::main_args::{closure#1}::{closure#0}, core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>>
  34:     0x56202b24fbb5 - rustc_span[323ba4f8bef90746]::with_source_map::<core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>, rustc_interface[e2cb08752aecdf39]::interface::run_compiler<core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>, rustdoc[37fab5a146ca0381]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  35:     0x56202b0d0865 - <scoped_tls[b7ce8b7e4286e02d]::ScopedKey<rustc_span[323ba4f8bef90746]::SessionGlobals>>::set::<rustc_interface[e2cb08752aecdf39]::interface::run_compiler<core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>, rustdoc[37fab5a146ca0381]::main_args::{closure#1}>::{closure#0}, core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>>
  36:     0x56202b2c5d70 - std[2f49e04a49785d41]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[e2cb08752aecdf39]::util::run_in_thread_pool_with_globals<rustc_interface[e2cb08752aecdf39]::interface::run_compiler<core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>, rustdoc[37fab5a146ca0381]::main_args::{closure#1}>::{closure#0}, core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>>
  37:     0x56202b3bb72d - <<std[2f49e04a49785d41]::thread::Builder>::spawn_unchecked_<rustc_interface[e2cb08752aecdf39]::util::run_in_thread_pool_with_globals<rustc_interface[e2cb08752aecdf39]::interface::run_compiler<core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>, rustdoc[37fab5a146ca0381]::main_args::{closure#1}>::{closure#0}, core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e1ff35b71d1701d9]::result::Result<(), rustc_errors[3f04fd9a36ec0931]::ErrorGuaranteed>>::{closure#1} as core[e1ff35b71d1701d9]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  38:     0x7f6faa973343 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5d679a3e0eef548a
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/alloc/src/boxed.rs:2000:9
  39:     0x7f6faa973343 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5129455b92134839
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/alloc/src/boxed.rs:2000:9
  40:     0x7f6faa973343 - std::sys::unix::thread::Thread::new::thread_start::haa6aecc225cb6cab
                               at /rustc/53e4b9dd74c29cc9308b8d0f10facac70bb101a7/library/std/src/sys/unix/thread.rs:108:17
  41:     0x7f6faa7068fd - <unknown>
  42:     0x7f6faa788a60 - <unknown>
  43:                0x0 - <unknown>
error: aborting due to previous error

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