rustdoc: unwrap of none: src/librustdoc/passes/collect_intra_doc_links.rs

[matthiaskrgr]

Code

#![deny(broken_intra_doc_links)]
#![feature(no_core, lang_items)]
#![no_core]
#![crate_type = "rlib"]


// @has prim_methods_local/index.html
// @has - '//*[@id="main"]//a[@href="{{channel}}/std/primitive.char.html"]' 'char'
// @has - '//*[@id="main"]//a[@href="{{channel}}/std/primitive.char.html#method.len_utf8"]' 'char::len_utf8'

//! A [`char`] and its [`char::len_utf8`].

#[lang = "char"]
impl char {
    pub fn len_utf8(self) -> usize {
        42
    }
}

#[lang = "sized"]
pub trait Sized {}

#[lang = "clone"]
pub trait Clone: Sized {}

#[lang = "copy"]
pub trait Copy: Clone {}

Meta

rustdoc 1.62.0-nightly (4ca19e09d 2022-04-19)
binary: rustdoc
commit-hash: 4ca19e09d302a4cbde14f9cb1bc109179dc824cd
commit-date: 2022-04-19
host: x86_64-unknown-linux-gnu
release: 1.62.0-nightly
LLVM version: 14.0.1

Error output

warning: lint `broken_intra_doc_links` has been renamed to `rustdoc::broken_intra_doc_links`
 --> ./2/124faa9a636ffb9d3b3e979c3a21689b2a5f7b16.rs:1:9
  |
1 | #![deny(broken_intra_doc_links)]
  |         ^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `rustdoc::broken_intra_doc_links`
  |
  = note: `#[warn(renamed_and_removed_lints)]` on by default

error[E0522]: definition of an unknown language item: `char`
  --> ./2/124faa9a636ffb9d3b3e979c3a21689b2a5f7b16.rs:13:1
   |
13 | #[lang = "char"]
   | ^^^^^^^^^^^^^^^^ definition of unknown language item `char`

error[E0390]: cannot define inherent `impl` for primitive types
  --> ./2/124faa9a636ffb9d3b3e979c3a21689b2a5f7b16.rs:14:6
   |
14 | impl char {
   |      ^^^^
   |
   = help: consider using an extension trait instead

Backtrace

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/librustdoc/passes/collect_intra_doc_links.rs:94:89
stack backtrace:
   0:     0x7f070f09d85d - std::backtrace_rs::backtrace::libunwind::trace::hd79e9b51bb0b02a3
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f070f09d85d - std::backtrace_rs::backtrace::trace_unsynchronized::hc4b2624d11f57391
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f070f09d85d - std::sys_common::backtrace::_print_fmt::h5b920b6df28041d5
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f070f09d85d - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h01f2db48eea34166
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f070f0f8efc - core::fmt::write::h743b8fce003c331c
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/core/src/fmt/mod.rs:1194:17
   5:     0x7f070f08f041 - std::io::Write::write_fmt::h55edc38b905db9b5
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/io/mod.rs:1655:15
   6:     0x7f070f0a0575 - std::sys_common::backtrace::_print::h72c54a6b7a86b7bf
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f070f0a0575 - std::sys_common::backtrace::print::h8b541992f5fa33c9
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f070f0a0575 - std::panicking::default_hook::{{closure}}::h47e8a61e5844dea4
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/panicking.rs:295:22
   9:     0x7f070f0a01e9 - std::panicking::default_hook::h65ae1796882c178c
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/panicking.rs:314:9
  10:     0x7f070f8cc5a1 - rustc_driver[caca827775d68846]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f070f0a0d46 - std::panicking::rust_panic_with_hook::h1c3eee211b989bad
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/panicking.rs:702:17
  12:     0x7f070f0a0b09 - std::panicking::begin_panic_handler::{{closure}}::h653627205f5b2cdc
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/panicking.rs:586:13
  13:     0x7f070f09dd14 - std::sys_common::backtrace::__rust_end_short_backtrace::h36d845a914b6aae7
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/sys_common/backtrace.rs:138:18
  14:     0x7f070f0a0879 - rust_begin_unwind
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/panicking.rs:584:5
  15:     0x7f070f065bd3 - core::panicking::panic_fmt::hb6389d787a80a806
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/core/src/panicking.rs:142:14
  16:     0x7f070f065a9d - core::panicking::panic::hac9e097b59d15ac2
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/core/src/panicking.rs:48:5
  17:     0x555739eb146c - <rustdoc[863d67c12390cb82]::passes::collect_intra_doc_links::Res>::def_id
  18:     0x555739ebb99d - <rustdoc[863d67c12390cb82]::passes::collect_intra_doc_links::LinkCollector as rustdoc[863d67c12390cb82]::visit::DocVisitor>::visit_item
  19:     0x555739eb0c9c - rustdoc[863d67c12390cb82]::passes::collect_intra_doc_links::collect_intra_doc_links
  20:     0x555739f60857 - rustdoc[863d67c12390cb82]::main_options::{closure#0}::{closure#0}::{closure#1}
  21:     0x555739eff889 - <rustc_interface[dacacaf3651fe347]::passes::QueryContext>::enter::<rustdoc[863d67c12390cb82]::main_options::{closure#0}::{closure#0}::{closure#1}, core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>>
  22:     0x555739e4de14 - <rustc_interface[dacacaf3651fe347]::interface::Compiler>::enter::<rustdoc[863d67c12390cb82]::main_options::{closure#0}::{closure#0}, core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>>
  23:     0x555739ccb85a - rustc_span[ff646084812721ee]::with_source_map::<core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>, rustc_interface[dacacaf3651fe347]::interface::create_compiler_and_run<core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>, rustdoc[863d67c12390cb82]::main_options::{closure#0}>::{closure#1}>
  24:     0x555739e75c44 - rustc_interface[dacacaf3651fe347]::interface::create_compiler_and_run::<core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>, rustdoc[863d67c12390cb82]::main_options::{closure#0}>
  25:     0x555739cce6d7 - <scoped_tls[d6203f3b3010b98e]::ScopedKey<rustc_span[ff646084812721ee]::SessionGlobals>>::set::<rustdoc[863d67c12390cb82]::main_args::{closure#0}, core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>>
  26:     0x555739e78aff - std[fd2a1eaf3e081d4d]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[dacacaf3651fe347]::util::run_in_thread_pool_with_globals<rustdoc[863d67c12390cb82]::main_args::{closure#0}, core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>>::{closure#0}, core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>>
  27:     0x555739f21d89 - <<std[fd2a1eaf3e081d4d]::thread::Builder>::spawn_unchecked_<rustc_interface[dacacaf3651fe347]::util::run_in_thread_pool_with_globals<rustdoc[863d67c12390cb82]::main_args::{closure#0}, core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>>::{closure#0}, core[864d7ae58f623181]::result::Result<(), rustc_errors[14f27e81a88a2c7]::ErrorGuaranteed>>::{closure#1} as core[864d7ae58f623181]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  28:     0x7f070f0aabf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h211dae6d8dec3611
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/alloc/src/boxed.rs:1866:9
  29:     0x7f070f0aabf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb54334e8a7bb1f12
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/alloc/src/boxed.rs:1866:9
  30:     0x7f070f0aabf3 - std::sys::unix::thread::Thread::new::thread_start::hf8b57655f2f2e68e
                               at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/library/std/src/sys/unix/thread.rs:108:17
  31:     0x7f070ed9b5c2 - start_thread
  32:     0x7f070ee20584 - __clone
  33:                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 (4ca19e09d 2022-04-19) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
error: aborting due to 2 previous errors; 1 warning emitted

Some errors have detailed explanations: E0390, E0522.
For more information about an error, try `rustc --explain E0390`.

[GuillaumeGomez]

cc @petrochenkov

[petrochenkov]

Rustdoc assumes that there is always a doc(primitive) module for every primitive type referred to by a doc link, which is not the case in the code example above or any "minimal core" example not containing the primitive documentation modules.

[petrochenkov]

Fixed in #103120.