Compiler error on nightly `cargo doc` invocation on `fltk-rs` repository

[64kramsystem]

Code

$ git clone https://github.com/fltk-rs/fltk-rs.git
$ git checkout a0402da3d160f55a5d41b1a8daec3d7a41f58fbc
$ cargo doc

Meta

rustc --version --verbose:

rustc 1.62.0-nightly (e7575f967 2022-04-14)
binary: rustc
commit-hash: e7575f9670f3c837def3d186ae09366c75c7632e
commit-date: 2022-04-14
host: x86_64-unknown-linux-gnu
release: 1.62.0-nightly
LLVM version: 14.0.0

Error output

(The whole backtrace is printed anyway, so I'm posting only the cargo doc output:

 Documenting fltk v1.3.5 (/tmp/fltk-rs/fltk)
thread 'rustc' panicked at 'no entry found for key', src/librustdoc/passes/collect_intra_doc_links.rs:976:16
stack backtrace:
   0:     0x7fcd713e496d - std::backtrace_rs::backtrace::libunwind::trace::h391ee3eb96720bb8
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fcd713e496d - std::backtrace_rs::backtrace::trace_unsynchronized::h8ac766d4ecc4f21c
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fcd713e496d - std::sys_common::backtrace::_print_fmt::h67120ae1638604b6
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7fcd713e496d - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h43d9264c5edad28c
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7fcd7143efec - core::fmt::write::hb38509135e81eb46
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/core/src/fmt/mod.rs:1194:17
   5:     0x7fcd713d60c1 - std::io::Write::write_fmt::h68856f209e22f0a1
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/io/mod.rs:1655:15
   6:     0x7fcd713e7685 - std::sys_common::backtrace::_print::h2f4ffd98d72d3d6b
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7fcd713e7685 - std::sys_common::backtrace::print::hca608482b4ab8751
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7fcd713e7685 - std::panicking::default_hook::{{closure}}::h9ed02f27942ac2ac
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/panicking.rs:295:22
   9:     0x7fcd713e72f9 - std::panicking::default_hook::h632f45ebccdd2f92
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/panicking.rs:314:9
  10:     0x7fcd71b88051 - rustc_driver[8d2c61ed892e27c5]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7fcd61147333 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::ha3e42d46fe255c46
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/alloc/src/boxed.rs:1880:9
  12:     0x7fcd611596dd - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}::h5530a261fac5a395
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/proc_macro/src/bridge/client.rs:335:21
  13:     0x7fcd713e7e56 - std::panicking::rust_panic_with_hook::h4565951773f90b0d
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/panicking.rs:702:17
  14:     0x7fcd713e7c57 - std::panicking::begin_panic_handler::{{closure}}::hc43ea5bc6ea479a7
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/panicking.rs:588:13
  15:     0x7fcd713e4e24 - std::sys_common::backtrace::__rust_end_short_backtrace::hce88d380b9b7207e
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/sys_common/backtrace.rs:138:18
  16:     0x7fcd713e7989 - rust_begin_unwind
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/panicking.rs:584:5
  17:     0x7fcd713ab933 - core::panicking::panic_fmt::h5088ed6a76740fc5
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/core/src/panicking.rs:142:14
  18:     0x7fcd7143be01 - core::panicking::panic_display::h1943abbc831ba687
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/core/src/panicking.rs:72:5
  19:     0x7fcd7143bdab - core::panicking::panic_str::h515e7e9b1ccc828a
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/core/src/panicking.rs:56:5
  20:     0x7fcd713ab7a6 - core::option::expect_failed::h940cf1bbf7d964ff
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/core/src/option.rs:1855:5
  21:     0x55a30525b349 - rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::resolve_associated_trait_item
  22:     0x55a305259aee - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector>::resolve_associated_item
  23:     0x55a305256cd5 - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector>::resolve
  24:     0x55a30525cc59 - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector as rustdoc[1fc6f13c0da15d8c]::visit::DocVisitor>::visit_item
  25:     0x55a30526ddaa - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector as rustdoc[1fc6f13c0da15d8c]::visit::DocVisitor>::visit_inner_recur
  26:     0x55a3052603d8 - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector as rustdoc[1fc6f13c0da15d8c]::visit::DocVisitor>::visit_item
  27:     0x55a30526dd2a - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector as rustdoc[1fc6f13c0da15d8c]::visit::DocVisitor>::visit_inner_recur
  28:     0x55a3052603bd - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector as rustdoc[1fc6f13c0da15d8c]::visit::DocVisitor>::visit_item
  29:     0x55a30526dd2a - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector as rustdoc[1fc6f13c0da15d8c]::visit::DocVisitor>::visit_inner_recur
  30:     0x55a3052603bd - <rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::LinkCollector as rustdoc[1fc6f13c0da15d8c]::visit::DocVisitor>::visit_item
  31:     0x55a30525528c - rustdoc[1fc6f13c0da15d8c]::passes::collect_intra_doc_links::collect_intra_doc_links
  32:     0x55a305303e27 - rustdoc[1fc6f13c0da15d8c]::main_options::{closure#0}::{closure#0}::{closure#1}
  33:     0x55a3052a3649 - <rustc_interface[ad68b8c89b0ab142]::passes::QueryContext>::enter::<rustdoc[1fc6f13c0da15d8c]::main_options::{closure#0}::{closure#0}::{closure#1}, core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>>
  34:     0x55a3051f2979 - <rustc_interface[ad68b8c89b0ab142]::interface::Compiler>::enter::<rustdoc[1fc6f13c0da15d8c]::main_options::{closure#0}::{closure#0}, core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>>
  35:     0x55a3053882da - rustc_span[58998adc3a002fd7]::with_source_map::<core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>, rustc_interface[ad68b8c89b0ab142]::interface::create_compiler_and_run<core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>, rustdoc[1fc6f13c0da15d8c]::main_options::{closure#0}>::{closure#1}>
  36:     0x55a3051f5334 - rustc_interface[ad68b8c89b0ab142]::interface::create_compiler_and_run::<core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>, rustdoc[1fc6f13c0da15d8c]::main_options::{closure#0}>
  37:     0x55a3050f238a - rustdoc[1fc6f13c0da15d8c]::main_options
  38:     0x55a305389d1b - <scoped_tls[5587684970d3e6f5]::ScopedKey<rustc_span[58998adc3a002fd7]::SessionGlobals>>::set::<rustdoc[1fc6f13c0da15d8c]::main_args::{closure#0}, core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>>
  39:     0x55a30521d31f - std[965189dd79571a90]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ad68b8c89b0ab142]::util::run_in_thread_pool_with_globals<rustdoc[1fc6f13c0da15d8c]::main_args::{closure#0}, core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>>::{closure#0}, core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>>
  40:     0x55a3052c5aa9 - <<std[965189dd79571a90]::thread::Builder>::spawn_unchecked_<rustc_interface[ad68b8c89b0ab142]::util::run_in_thread_pool_with_globals<rustdoc[1fc6f13c0da15d8c]::main_args::{closure#0}, core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>>::{closure#0}, core[c15249dfec5bc62b]::result::Result<(), rustc_errors[b80d242712464baa]::ErrorGuaranteed>>::{closure#1} as core[c15249dfec5bc62b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  41:     0x7fcd713f2033 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h051b06cc552f7ca2
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/alloc/src/boxed.rs:1866:9
  42:     0x7fcd713f2033 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0ed7e89ffdc39ab5
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/alloc/src/boxed.rs:1866:9
  43:     0x7fcd713f2033 - std::sys::unix::thread::Thread::new::thread_start::hf01169ad6dd2310f
                               at /rustc/e7575f9670f3c837def3d186ae09366c75c7632e/library/std/src/sys/unix/thread.rs:108:17
  44:     0x7fcd7130a609 - start_thread
                               at /build/glibc-sMfBJT/glibc-2.31/nptl/pthread_create.c:477:8
  45:     0x7fcd710b3163 - clone
  46:                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 1.62.0-nightly (e7575f967 2022-04-14) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib

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

query stack during panic:
end of query stack
error: could not document `fltk`

Caused by:
  process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name fltk fltk/src/lib.rs -o /tmp/fltk-rs/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat -C metadata=554e9c97422d16fb -L dependency=/tmp/fltk-rs/target/debug/deps --extern bitflags=/tmp/fltk-rs/target/debug/deps/libbitflags-f75283d3dcd3daad.rmeta --extern crossbeam_channel=/tmp/fltk-rs/target/debug/deps/libcrossbeam_channel-953c0c9c26457b2e.rmeta --extern fltk_sys=/tmp/fltk-rs/target/debug/deps/libfltk_sys-29c8541252091319.rmeta --extern paste=/tmp/fltk-rs/target/debug/deps/libpaste-85067c7f435fa569.so --extern ttf_parser=/tmp/fltk-rs/target/debug/deps/libttf_parser-d364752abb3e84e9.rmeta --crate-version 1.3.5` (exit status: 101)

[GuillaumeGomez]

I'll take a look in the next days. Seems like it's an intra-doc link bug.

[GuillaumeGomez]

Here is a code which reproduces the error:

pub mod app {
    pub struct S;

    impl S {
        /**
          Doc comment hello! [`Foo::by_name`](`crate::enums::Foo::by_name`).
        */
        pub fn whatever(&self) {}
    }
}

pub mod enums {
    pub enum Foo {
        Bar,
    }

    impl Foo {
        pub fn by_name(&self) {}
    }
}

[GuillaumeGomez]

Surprisingly enough, /// doc comments don't reproduce the bug. This is highly surprising.

[GuillaumeGomez]

Figured the problem: the doc block hasn't been cleaned yet in the early intra doc links pass. Meaning that it interprets the link as a code block (because of the indent) and therefore doesn't load the associated module.