ICE: rustdoc: no resolution for "Clone" ValueNS

[fmease]

//! [Clone ()].

The space before the parentheses is fundamental for reproducing the ICE.

Stderr:

thread 'rustc' panicked at 'no resolution for "Clone" ValueNS DefId(0:0 ~ ice[8695])', src/librustdoc/passes/collect_intra_doc_links.rs:400:32

Backtrace

stack backtrace:
   0:     0x7f8378d653c2 - std::backtrace_rs::backtrace::libunwind::trace::h525b1374168ca5f5
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f8378d653c2 - std::backtrace_rs::backtrace::trace_unsynchronized::hbe1189bd30120710
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f8378d653c2 - std::sys_common::backtrace::_print_fmt::h6d41ce120747d96c
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f8378d653c2 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he5f24c3f95c04d12
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f8378dc95df - core::fmt::write::hd579dd2cd8b90ab4
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/core/src/fmt/mod.rs:1254:17
   5:     0x7f8378d58371 - std::io::Write::write_fmt::h08f41109b1759352
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/io/mod.rs:1698:15
   6:     0x7f8378d651c5 - std::sys_common::backtrace::_print::h737d8d1dfcf76757
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f8378d651c5 - std::sys_common::backtrace::print::h39334e0c9054c05f
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f8378d67e87 - std::panicking::default_hook::{{closure}}::h25ffe0afd704bb41
   9:     0x7f8378d67c75 - std::panicking::default_hook::hcc330145d87d1abb
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/panicking.rs:288:9
  10:     0x7f837c044815 - <rustc_driver_impl[d341cd7f64842292]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[b8003d5837be85a8]::ops::function::FnOnce<(&core[b8003d5837be85a8]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7f8378d685c5 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hf364256ba514b763
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/alloc/src/boxed.rs:1987:9
  12:     0x7f8378d685c5 - std::panicking::rust_panic_with_hook::hf301d5f852bec833
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/panicking.rs:695:13
  13:     0x7f8378d68339 - std::panicking::begin_panic_handler::{{closure}}::h7282266f4cf8a4a9
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/panicking.rs:582:13
  14:     0x7f8378d65806 - std::sys_common::backtrace::__rust_end_short_backtrace::h8026ff750646ab77
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/sys_common/backtrace.rs:150:18
  15:     0x7f8378d68092 - rust_begin_unwind
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/panicking.rs:578:5
  16:     0x7f8378dc5953 - core::panicking::panic_fmt::haeb362b34c4a0862
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/core/src/panicking.rs:67:14
  17:     0x55990847e1c7 - <rustdoc[8246ea49ca4ce650]::passes::collect_intra_doc_links::LinkCollector>::resolve_path
  18:     0x55990847e338 - <rustdoc[8246ea49ca4ce650]::passes::collect_intra_doc_links::LinkCollector>::resolve
  19:     0x55990848383d - <rustdoc[8246ea49ca4ce650]::passes::collect_intra_doc_links::LinkCollector>::resolve_links
  20:     0x55990847cdfd - rustdoc[8246ea49ca4ce650]::passes::collect_intra_doc_links::collect_intra_doc_links
  21:     0x5599086236b2 - <rustc_session[e7b0bce5b7a65ece]::session::Session>::time::<rustdoc[8246ea49ca4ce650]::clean::types::Crate, rustdoc[8246ea49ca4ce650]::core::run_global_ctxt::{closure#8}>
  22:     0x5599086c2f4e - rustdoc[8246ea49ca4ce650]::core::run_global_ctxt
  23:     0x55990862392e - <rustc_session[e7b0bce5b7a65ece]::session::Session>::time::<(rustdoc[8246ea49ca4ce650]::clean::types::Crate, rustdoc[8246ea49ca4ce650]::config::RenderOptions, rustdoc[8246ea49ca4ce650]::formats::cache::Cache), rustdoc[8246ea49ca4ce650]::main_args::{closure#1}::{closure#0}::{closure#0}::{closure#0}>
  24:     0x55990858d1d8 - <std[d7940225b46693d5]::thread::local::LocalKey<core[b8003d5837be85a8]::cell::Cell<*const ()>>>::with::<rustc_middle[8d82ae2353292c40]::ty::context::tls::enter_context<<rustc_middle[8d82ae2353292c40]::ty::context::GlobalCtxt>::enter<rustdoc[8246ea49ca4ce650]::main_args::{closure#1}::{closure#0}::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>
  25:     0x55990864cb7b - <rustc_interface[6d2e349332c04921]::queries::QueryResult<&rustc_middle[8d82ae2353292c40]::ty::context::GlobalCtxt>>::enter::<core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>, rustdoc[8246ea49ca4ce650]::main_args::{closure#1}::{closure#0}::{closure#0}>
  26:     0x5599084c43be - <rustc_interface[6d2e349332c04921]::interface::Compiler>::enter::<rustdoc[8246ea49ca4ce650]::main_args::{closure#1}::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>
  27:     0x5599086cd6fb - rustc_span[e29a588bda90721d]::set_source_map::<core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>, rustc_interface[6d2e349332c04921]::interface::run_compiler<core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>, rustdoc[8246ea49ca4ce650]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  28:     0x5599084c602d - <scoped_tls[400ad5b00280e7e0]::ScopedKey<rustc_span[e29a588bda90721d]::SessionGlobals>>::set::<rustc_interface[6d2e349332c04921]::interface::run_compiler<core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>, rustdoc[8246ea49ca4ce650]::main_args::{closure#1}>::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>
  29:     0x559908442319 - std[d7940225b46693d5]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[6d2e349332c04921]::util::run_in_thread_pool_with_globals<rustc_interface[6d2e349332c04921]::interface::run_compiler<core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>, rustdoc[8246ea49ca4ce650]::main_args::{closure#1}>::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>
  30:     0x559908734a8d - <<std[d7940225b46693d5]::thread::Builder>::spawn_unchecked_<rustc_interface[6d2e349332c04921]::util::run_in_thread_pool_with_globals<rustc_interface[6d2e349332c04921]::interface::run_compiler<core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>, rustdoc[8246ea49ca4ce650]::main_args::{closure#1}>::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b8003d5837be85a8]::result::Result<(), rustc_span[e29a588bda90721d]::ErrorGuaranteed>>::{closure#1} as core[b8003d5837be85a8]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  31:     0x7f8378d72a85 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3bc15d1a646f1457
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/alloc/src/boxed.rs:1973:9
  32:     0x7f8378d72a85 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb9beb1ea11c0ec94
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/alloc/src/boxed.rs:1973:9
  33:     0x7f8378d72a85 - std::sys::unix::thread::Thread::new::thread_start::hd509204763cabd02
                               at /rustc/7908a1d65496b88626e4b7c193c81d777005d6f3/library/std/src/sys/unix/thread.rs:108:17
  34:     0x7f8378a25bb5 - <unknown>
  35:     0x7f8378aa7d90 - <unknown>
  36:                0x0 - <unknown>

error: 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 1.71.0-nightly (7908a1d65 2023-04-17) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

Meta

rustdoc -Vv:

rustdoc 1.71.0-nightly (7908a1d65 2023-04-17)
binary: rustdoc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 1.71.0-nightly
LLVM version: 16.0.2

@rustbot label I-ICE T-rustdoc A-intra-doc-links
@rustbot claim

[fmease]

Without the space, rustdoc correctly reports:

warning: unresolved link to `Clone`
 --> ice.rs:1:6
  |
1 | //! [Clone()].
  |      ^^^^^^^ this link resolves to the trait `Clone`, which is not in the value namespace
  |
  = note: `#[warn(rustdoc::broken_intra_doc_links)]` on by default
help: to link to the trait, prefix with `trait@`
  |
1 - //! [Clone()].
1 + //! [trait@Clone].
  |

warning: 1 warning emitted