ICE: rustdoc: bad typedef with mismaching types

[matthiaskrgr]

Code

type f = [_; ()];

Meta

rustc --version --verbose:

<version>

Error output

rustc 1.68.0-nightly (92c1937a9 2022-12-27)
binary: rustc
commit-hash: 92c1937a90e5b6f20fa6e87016d6869da363972e
commit-date: 2022-12-27
host: x86_64-unknown-linux-gnu
release: 1.68.0-nightly
LLVM version: 15.0.6

Backtrace

warning: type `f` should have an upper camel case name
 --> 3e013b73d4827d798a08206be767a4c18a0c158b.rs:1:6
  |
1 | type f = [_; ()];
  |      ^ help: convert the identifier to upper camel case (notice the capitalization): `F`
  |
  = note: `#[warn(non_camel_case_types)]` on by default

error[E0308]: mismatched types
 --> 3e013b73d4827d798a08206be767a4c18a0c158b.rs:1:14
  |
1 | type f = [_; ()];
  |              ^^ expected `usize`, found `()`

thread 'rustc' panicked at 'Error', src/librustdoc/clean/mod.rs:1856:25
stack backtrace:
   0:     0x7f8351b653da - std::backtrace_rs::backtrace::libunwind::trace::hd9920c45cab02727
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f8351b653da - std::backtrace_rs::backtrace::trace_unsynchronized::h0e8ba232432f278b
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f8351b653da - std::sys_common::backtrace::_print_fmt::h70b1bf152d50d826
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f8351b653da - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0f8a00c5ac0ea98c
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f8351bc862e - core::fmt::write::h75194d37b0340e77
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f8351b55885 - std::io::Write::write_fmt::h019baaeffa3c233d
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/io/mod.rs:1682:15
   6:     0x7f8351b651a5 - std::sys_common::backtrace::_print::hd2cb40128730a76d
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f8351b651a5 - std::sys_common::backtrace::print::h30c90b179f5588ff
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f8351b67f6f - std::panicking::default_hook::{{closure}}::hb4605418c1ac9dde
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:267:22
   9:     0x7f8351b67cab - std::panicking::default_hook::h911627d2c5874d29
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:286:9
  10:     0x7f8354e6ce4f - rustc_driver[be31376d096510e8]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f8351b687ad - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h30886b880f16ecd7
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/alloc/src/boxed.rs:2032:9
  12:     0x7f8351b687ad - std::panicking::rust_panic_with_hook::h7c2b44024a401155
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:692:13
  13:     0x7f8351b684e2 - std::panicking::begin_panic_handler::{{closure}}::h8e64ae5b7bafe3c0
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:577:13
  14:     0x7f8351b6588c - std::sys_common::backtrace::__rust_end_short_backtrace::hd43ee2e6b4a0d8d6
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:137:18
  15:     0x7f8351b68232 - rust_begin_unwind
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:575:5
  16:     0x7f8351bc5013 - core::panicking::panic_fmt::hfd723e1f10b23e9d
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/core/src/panicking.rs:64:14
  17:     0x56023a4deeaf - rustdoc[8f23bbef6cf7efb7]::clean::clean_middle_ty
  18:     0x56023a4ddfda - rustdoc[8f23bbef6cf7efb7]::clean::clean_middle_ty
  19:     0x56023a3fee21 - <rustdoc[8f23bbef6cf7efb7]::core::DocContext>::with_param_env::<alloc[c40375f0f7ff5c91]::vec::Vec<rustdoc[8f23bbef6cf7efb7]::clean::types::Item>, rustdoc[8f23bbef6cf7efb7]::clean::clean_maybe_renamed_item::{closure#1}>
  20:     0x56023a4a6efc - <&mut rustdoc[8f23bbef6cf7efb7]::clean::clean_doc_module::{closure#2} as core[468623a6da7d9ec9]::ops::function::FnOnce<(&(&rustc_hir[de13f172e2d2f68e]::hir::Item, core[468623a6da7d9ec9]::option::Option<rustc_span[414a16377e6cb62b]::symbol::Symbol>, core[468623a6da7d9ec9]::option::Option<rustc_hir[de13f172e2d2f68e]::hir_id::HirId>),)>>::call_once
  21:     0x56023a26d894 - <alloc[c40375f0f7ff5c91]::vec::Vec<rustdoc[8f23bbef6cf7efb7]::clean::types::Item> as alloc[c40375f0f7ff5c91]::vec::spec_extend::SpecExtend<rustdoc[8f23bbef6cf7efb7]::clean::types::Item, core[468623a6da7d9ec9]::iter::adapters::flatten::FlatMap<core[468623a6da7d9ec9]::slice::iter::Iter<(&rustc_hir[de13f172e2d2f68e]::hir::Item, core[468623a6da7d9ec9]::option::Option<rustc_span[414a16377e6cb62b]::symbol::Symbol>, core[468623a6da7d9ec9]::option::Option<rustc_hir[de13f172e2d2f68e]::hir_id::HirId>)>, alloc[c40375f0f7ff5c91]::vec::Vec<rustdoc[8f23bbef6cf7efb7]::clean::types::Item>, rustdoc[8f23bbef6cf7efb7]::clean::clean_doc_module::{closure#2}>>>::spec_extend
  22:     0x56023a4ad3e8 - rustdoc[8f23bbef6cf7efb7]::clean::clean_doc_module
  23:     0x56023a1b4171 - rustdoc[8f23bbef6cf7efb7]::clean::utils::krate
  24:     0x56023a374954 - <rustc_session[484a5cd1f43b0798]::session::Session>::time::<rustdoc[8f23bbef6cf7efb7]::clean::types::Crate, rustdoc[8f23bbef6cf7efb7]::core::run_global_ctxt::{closure#4}>
  25:     0x56023a403767 - rustdoc[8f23bbef6cf7efb7]::core::run_global_ctxt
  26:     0x56023a375ca4 - <rustc_interface[e3f740b58bbe8d54]::passes::QueryContext>::enter::<rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}::{closure#0}::{closure#1}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>
  27:     0x56023a1c778a - <rustc_interface[e3f740b58bbe8d54]::interface::Compiler>::enter::<rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>
  28:     0x56023a30d86a - rustc_span[414a16377e6cb62b]::with_source_map::<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustc_interface[e3f740b58bbe8d54]::interface::run_compiler<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  29:     0x56023a192695 - <scoped_tls[b199c6e77ce176e9]::ScopedKey<rustc_span[414a16377e6cb62b]::SessionGlobals>>::set::<rustc_interface[e3f740b58bbe8d54]::interface::run_compiler<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}>::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>
  30:     0x56023a3200b0 - std[f1a6b9449c89a13c]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[e3f740b58bbe8d54]::util::run_in_thread_pool_with_globals<rustc_interface[e3f740b58bbe8d54]::interface::run_compiler<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}>::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>
  31:     0x56023a47a9df - <<std[f1a6b9449c89a13c]::thread::Builder>::spawn_unchecked_<rustc_interface[e3f740b58bbe8d54]::util::run_in_thread_pool_with_globals<rustc_interface[e3f740b58bbe8d54]::interface::run_compiler<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}>::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>::{closure#1} as core[468623a6da7d9ec9]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  32:     0x7f8351b72c53 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h633e4f7ed41b131b
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/alloc/src/boxed.rs:2000:9
  33:     0x7f8351b72c53 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h46d52a363ffe776a
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/alloc/src/boxed.rs:2000:9
  34:     0x7f8351b72c53 - std::sys::unix::thread::Thread::new::thread_start::h6d9ed7daf86174ef
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys/unix/thread.rs:108:17
  35:     0x7f83519048fd - <unknown>
  36:     0x7f8351986a60 - <unknown>
  37:                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 (92c1937a9 2022-12-27) running on x86_64-unknown-linux-gnu

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