rustdoc JSON ICE with `#[doc(hidden)]` on enum tuple field

[Enselic]

Found via #99919 (comment)

Step-by-step:

1. Download and extract https://github.com/malobre/rust-vue-sfc/archive/refs/tags/v0.3.2.zip
2. cd into the root dir and run cargo +nightly rustdoc --lib -- -Z unstable-options --output-format json with rustdoc 1.65.0-nightly (75b7e52e9 2022-08-13)

Expected

rustdoc JSON is built

Actual

/home/martin/Downloads/rust-vue-sfc-0.3.2
% cargo +nightly rustdoc --lib -- -Z unstable-options --output-format json
 Documenting vue-sfc v0.3.2 (/home/martin/Downloads/rust-vue-sfc-0.3.2)
thread 'rustc' panicked at 'internal error: entered unreachable code', src/librustdoc/json/conversions.rs:675:29
stack backtrace:
   0:     0x7f3732a1f1f0 - std::backtrace_rs::backtrace::libunwind::trace::h0ad3ea1f295943fa
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   1:     0x7f3732a1f1f0 - std::backtrace_rs::backtrace::trace_unsynchronized::h3d735ea737b7cb6f
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f3732a1f1f0 - std::sys_common::backtrace::_print_fmt::hfbffa4aad48cf418
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f3732a1f1f0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha738a84a6d451bf0
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f3732a7a2be - core::fmt::write::h8417ef24f00d0b21
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/core/src/fmt/mod.rs:1202:17
   5:     0x7f3732a0ff05 - std::io::Write::write_fmt::h3e7ec06f2b377bbe
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/io/mod.rs:1672:15
   6:     0x7f3732a21eb3 - std::sys_common::backtrace::_print::h7befeffc780b8cec
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f3732a21eb3 - std::sys_common::backtrace::print::haf96690800a3a335
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f3732a21eb3 - std::panicking::default_hook::{{closure}}::h1ac2b0dba5bc8279
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/panicking.rs:295:22
   9:     0x7f3732a21b9f - std::panicking::default_hook::h7348babc6f3f8e11
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/panicking.rs:314:9
  10:     0x7f3735260184 - <rustc_driver[8e6a5299f9cc0d8]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[104d4c2fa3822a9e]::ops::function::FnOnce<(&core[104d4c2fa3822a9e]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7f3732a226ed - std::panicking::rust_panic_with_hook::hc4945fbcea3150e8
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/panicking.rs:702:17
  12:     0x7f3732a22501 - std::panicking::begin_panic_handler::{{closure}}::h585f395f8e9063ac
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/panicking.rs:586:13
  13:     0x7f3732a1f6fc - std::sys_common::backtrace::__rust_end_short_backtrace::hf45c20ce028cb9f2
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/sys_common/backtrace.rs:138:18
  14:     0x7f3732a22262 - rust_begin_unwind
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/panicking.rs:584:5
  15:     0x7f3732a76dd3 - core::panicking::panic_fmt::hba397905ae8201a3
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/core/src/panicking.rs:142:14
  16:     0x7f3732a76c1d - core::panicking::panic::h1050c7a91854cd90
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/core/src/panicking.rs:48:5
  17:     0x55f3f9db7dd7 - <rustdoc_json_types[6fb1e2c5ce75c474]::Variant as rustdoc[da35cc98693c420e]::json::conversions::FromWithTcx<rustdoc[da35cc98693c420e]::clean::types::Variant>>::from_tcx::{closure#0}
  18:     0x55f3f9d86418 - <core[104d4c2fa3822a9e]::iter::adapters::map::Map<alloc[857b60bb6b1cd1fc]::vec::into_iter::IntoIter<rustdoc[da35cc98693c420e]::clean::types::Item>, <rustdoc_json_types[6fb1e2c5ce75c474]::Variant as rustdoc[da35cc98693c420e]::json::conversions::FromWithTcx<rustdoc[da35cc98693c420e]::clean::types::Variant>>::from_tcx::{closure#0}> as core[104d4c2fa3822a9e]::iter::traits::iterator::Iterator>::fold::<(), core[104d4c2fa3822a9e]::iter::traits::iterator::Iterator::for_each::call<rustdoc_json_types[6fb1e2c5ce75c474]::Type, <alloc[857b60bb6b1cd1fc]::vec::Vec<rustdoc_json_types[6fb1e2c5ce75c474]::Type> as alloc[857b60bb6b1cd1fc]::vec::spec_extend::SpecExtend<rustdoc_json_types[6fb1e2c5ce75c474]::Type, core[104d4c2fa3822a9e]::iter::adapters::map::Map<alloc[857b60bb6b1cd1fc]::vec::into_iter::IntoIter<rustdoc[da35cc98693c420e]::clean::types::Item>, <rustdoc_json_types[6fb1e2c5ce75c474]::Variant as rustdoc[da35cc98693c420e]::json::conversions::FromWithTcx<rustdoc[da35cc98693c420e]::clean::types::Variant>>::from_tcx::{closure#0}>>>::spec_extend::{closure#0}>::{closure#0}>
  19:     0x55f3f9c8fae1 - <alloc[857b60bb6b1cd1fc]::vec::Vec<rustdoc_json_types[6fb1e2c5ce75c474]::Type> as alloc[857b60bb6b1cd1fc]::vec::spec_from_iter::SpecFromIter<rustdoc_json_types[6fb1e2c5ce75c474]::Type, core[104d4c2fa3822a9e]::iter::adapters::map::Map<alloc[857b60bb6b1cd1fc]::vec::into_iter::IntoIter<rustdoc[da35cc98693c420e]::clean::types::Item>, <rustdoc_json_types[6fb1e2c5ce75c474]::Variant as rustdoc[da35cc98693c420e]::json::conversions::FromWithTcx<rustdoc[da35cc98693c420e]::clean::types::Variant>>::from_tcx::{closure#0}>>>::from_iter
  20:     0x55f3f9db46df - rustdoc[da35cc98693c420e]::json::conversions::from_clean_item
  21:     0x55f3f9c272ab - <rustdoc[da35cc98693c420e]::json::JsonRenderer as rustdoc[da35cc98693c420e]::formats::renderer::FormatRenderer>::item
  22:     0x55f3f9c26f87 - <rustdoc[da35cc98693c420e]::json::JsonRenderer as rustdoc[da35cc98693c420e]::formats::renderer::FormatRenderer>::item
  23:     0x55f3f9c26f27 - <rustdoc[da35cc98693c420e]::json::JsonRenderer as rustdoc[da35cc98693c420e]::formats::renderer::FormatRenderer>::item
  24:     0x55f3f9c26f87 - <rustdoc[da35cc98693c420e]::json::JsonRenderer as rustdoc[da35cc98693c420e]::formats::renderer::FormatRenderer>::item
  25:     0x55f3f9c26f87 - <rustdoc[da35cc98693c420e]::json::JsonRenderer as rustdoc[da35cc98693c420e]::formats::renderer::FormatRenderer>::item
  26:     0x55f3f9d9ef6e - rustdoc[da35cc98693c420e]::formats::renderer::run_format::<rustdoc[da35cc98693c420e]::json::JsonRenderer>
  27:     0x55f3f9af35d2 - rustdoc[da35cc98693c420e]::run_renderer::<rustdoc[da35cc98693c420e]::json::JsonRenderer>
  28:     0x55f3f9db8d68 - <rustc_session[2ec63f124a1a20e1]::session::Session>::time::<core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>, rustdoc[da35cc98693c420e]::main_options::{closure#0}::{closure#0}::{closure#1}::{closure#2}>
  29:     0x55f3f9ce9538 - <rustc_interface[3f0e16ab3f9f028a]::passes::QueryContext>::enter::<rustdoc[da35cc98693c420e]::main_options::{closure#0}::{closure#0}::{closure#1}, core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>>
  30:     0x55f3f9bd5999 - <rustc_interface[3f0e16ab3f9f028a]::interface::Compiler>::enter::<rustdoc[da35cc98693c420e]::main_options::{closure#0}::{closure#0}, core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>>
  31:     0x55f3f9e13f11 - rustc_span[9601ff5af35df49b]::with_source_map::<core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>, rustc_interface[3f0e16ab3f9f028a]::interface::create_compiler_and_run<core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>, rustdoc[da35cc98693c420e]::main_options::{closure#0}>::{closure#1}>
  32:     0x55f3f9c0568c - rustc_interface[3f0e16ab3f9f028a]::interface::create_compiler_and_run::<core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>, rustdoc[da35cc98693c420e]::main_options::{closure#0}>
  33:     0x55f3f9af6a70 - rustdoc[da35cc98693c420e]::main_options
  34:     0x55f3f9ce669c - <scoped_tls[a483a1011af12e7b]::ScopedKey<rustc_span[9601ff5af35df49b]::SessionGlobals>>::set::<rustdoc[da35cc98693c420e]::main_args::{closure#0}, core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>>
  35:     0x55f3f9d7d470 - std[e1c98a26831e884c]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[3f0e16ab3f9f028a]::util::run_in_thread_pool_with_globals<rustdoc[da35cc98693c420e]::main_args::{closure#0}, core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>>::{closure#0}, core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>>
  36:     0x55f3f9c0d9d8 - <<std[e1c98a26831e884c]::thread::Builder>::spawn_unchecked_<rustc_interface[3f0e16ab3f9f028a]::util::run_in_thread_pool_with_globals<rustdoc[da35cc98693c420e]::main_args::{closure#0}, core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>>::{closure#0}, core[104d4c2fa3822a9e]::result::Result<(), rustc_errors[f2be49721dffa37f]::ErrorGuaranteed>>::{closure#1} as core[104d4c2fa3822a9e]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x7f3732a2c4e3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hda2f928af025a78b
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/alloc/src/boxed.rs:1935:9
  38:     0x7f3732a2c4e3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9bd78ed494fef80b
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/alloc/src/boxed.rs:1935:9
  39:     0x7f3732a2c4e3 - std::sys::unix::thread::Thread::new::thread_start::h1972473febc5ebc9
                               at /rustc/75b7e52e92c3b00fc891b47f5b2efdff0a2be55a/library/std/src/sys/unix/thread.rs:108:17
  40:     0x7f3732775e2d - start_thread
                               at /usr/src/debug/glibc-2.35-15.fc36.x86_64/nptl/pthread_create.c:442:8
  41:     0x7f37327fb1b0 - __clone3
                               at /usr/src/debug/glibc-2.35-15.fc36.x86_64/misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  42:                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 1.65.0-nightly (75b7e52e9 2022-08-13) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -Z unstable-options

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: could not document `vue-sfc`

Caused by:
  process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name vue_sfc src/lib.rs -o /home/martin/Downloads/rust-vue-sfc-0.3.2/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat -Z unstable-options --output-format json -C metadata=e2c874287dd69323 -L dependency=/home/martin/Downloads/rust-vue-sfc-0.3.2/target/debug/deps --extern memchr=/home/martin/Downloads/rust-vue-sfc-0.3.2/target/debug/deps/libmemchr-09421297eb8835cb.rmeta --extern nom=/home/martin/Downloads/rust-vue-sfc-0.3.2/target/debug/deps/libnom-d906f14b85917df1.rmeta --crate-version 0.3.2` (exit status: 101)

@rustbot labels +A-rustdoc-json +T-rustdoc +I-ICE +requires-nightly

[aDotInTheVoid]

@rustbot modify labels: +E-needs-mcve

[Enselic]

Same ICE can also be reproduced with https://github.com/Kijewski/tzdb/archive/refs/tags/v0.4.3.zip which crater also found

[aDotInTheVoid]

MCVE

pub enum ParseError {
    UnexpectedEndTag(#[doc(hidden)] String),
}

The tzdb ice is the same issue, it also used #[doc(hidden)] on enum fields: https://github.com/Kijewski/tzdb/blob/3970d8159734bbc61be0b17f04e91f3274ba3b86/src/now.rs#L49.

Could you rename the issue?

@rustbot modify labels: -E-needs-mcve

[GuillaumeGomez]

Thanks for the MCVE! I'm planning to work on it tomorrow if no one did until then.