rustdoc: ice: unable to fulfill trait

[matthiaskrgr]

Code

struct Foo<'a, 'b, T> {
    field1: dyn Bar<'a, 'b, >
}

trait Bar<'x, 's, U>
    where U: 'x,
    Self:'x,
    Self:'s
{}

fn main() {}

Meta

rustc --version --verbose:

rustc 1.67.0-nightly (e1d819583 2022-12-05)
binary: rustc
commit-hash: e1d819583f0bf13b016b119c1c2c43e6d3979450
commit-date: 2022-12-05
host: x86_64-unknown-linux-gnu
release: 1.67.0-nightly
LLVM version: 15.0.4

Error output

error[E0107]: this trait takes 1 generic argument but 0 generic arguments were supplied
 --> 3c7a22d440d7586a3e549c35827ad5805e535744.rs:2:17
  |
2 |     field1: dyn Bar<'a, 'b, >
  |                 ^^^ expected 1 generic argument
  |
note: trait defined here, with 1 generic parameter: `U`
 --> 3c7a22d440d7586a3e549c35827ad5805e535744.rs:5:7
  |
5 | trait Bar<'x, 's, U>
  |       ^^^         -
help: add missing generic argument
  |
2 |     field1: dyn Bar<'a, 'b, U, >
  |                           +++

error[E0227]: ambiguous lifetime bound, explicit lifetime bound required
 --> 3c7a22d440d7586a3e549c35827ad5805e535744.rs:2:13
  |
2 |     field1: dyn Bar<'a, 'b, >
  |             ^^^^^^^^^^^^^^^^^

Backtrace

thread 'rustc' panicked at 'Unable to fulfill trait DefId(2:2645 ~ core[20f2]::marker::Send) for 'Foo<'a, 'b, T>': [FulfillmentError(Obligation(predicate=Binder(TraitPredicate(<(dyn Bar<'a, 'b, [type error]> + 'b) as std::marker::Send>, polarity:Positive), []), depth=1),Ambiguity)]', /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/compiler/rustc_trait_selection/src/traits/auto_trait.rs:186:13
stack backtrace:
   0:     0x7f3c191662da - std::backtrace_rs::backtrace::libunwind::trace::h6fe28ad196a3e4ed
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f3c191662da - std::backtrace_rs::backtrace::trace_unsynchronized::hdad13e56b75cb767
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f3c191662da - std::sys_common::backtrace::_print_fmt::h72698cd49f57f169
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f3c191662da - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he1fafb2965ae8597
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f3c191c8ece - core::fmt::write::hd89239c1da17525f
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f3c19156795 - std::io::Write::write_fmt::hab2ba8c4cc7c81ad
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/io/mod.rs:1682:15
   6:     0x7f3c191660a5 - std::sys_common::backtrace::_print::h06824445c27eddc7
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f3c191660a5 - std::sys_common::backtrace::print::h26084488db770bf5
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f3c19168def - std::panicking::default_hook::{{closure}}::h28bd5d5e965e5d01
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/panicking.rs:267:22
   9:     0x7f3c19168b2b - std::panicking::default_hook::h0619f06d194d8c45
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/panicking.rs:286:9
  10:     0x7f3c1916960c - std::panicking::rust_panic_with_hook::h3e553e07d5fd01e7
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/panicking.rs:688:13
  11:     0x7f3c191693a9 - std::panicking::begin_panic_handler::{{closure}}::ha64b2b2abb6ffa74
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/panicking.rs:579:13
  12:     0x7f3c1916678c - std::sys_common::backtrace::__rust_end_short_backtrace::h0ed3e558b8469848
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x7f3c191690b2 - rust_begin_unwind
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/panicking.rs:575:5
  14:     0x7f3c191c58b3 - core::panicking::panic_fmt::h0000e7abdb8aa8da
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/core/src/panicking.rs:64:14
  15:     0x561e7e25c7a4 - <rustc_trait_selection[15c87c01405d530d]::traits::auto_trait::AutoTraitFinder>::find_auto_trait_generics::<rustdoc[4d62e6a838d5304]::clean::types::Generics, <rustdoc[4d62e6a838d5304]::clean::auto_trait::AutoTraitFinder>::generate_for_trait::{closure#0}>
  16:     0x561e7dfec2c3 - <rustdoc[4d62e6a838d5304]::clean::auto_trait::AutoTraitFinder>::generate_for_trait
  17:     0x561e7e0a23e7 - <alloc[9916749a77d582e4]::vec::Vec<rustdoc[4d62e6a838d5304]::clean::types::Item> as alloc[9916749a77d582e4]::vec::spec_from_iter::SpecFromIter<rustdoc[4d62e6a838d5304]::clean::types::Item, core[20f247eb21f65857]::iter::adapters::filter_map::FilterMap<alloc[9916749a77d582e4]::vec::into_iter::IntoIter<rustc_span[fcb1f4a96315ac3a]::def_id::DefId>, <rustdoc[4d62e6a838d5304]::clean::auto_trait::AutoTraitFinder>::get_auto_trait_impls::{closure#0}>>>::from_iter
  18:     0x561e7dfecf9e - <rustdoc[4d62e6a838d5304]::clean::auto_trait::AutoTraitFinder>::get_auto_trait_impls
  19:     0x561e7e133c25 - rustdoc[4d62e6a838d5304]::clean::utils::get_auto_trait_and_blanket_impls
  20:     0x561e7e213462 - <rustdoc[4d62e6a838d5304]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[4d62e6a838d5304]::visit::DocVisitor>::visit_item
  21:     0x561e7e2135aa - <rustdoc[4d62e6a838d5304]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[4d62e6a838d5304]::visit::DocVisitor>::visit_item
  22:     0x561e7e210777 - rustdoc[4d62e6a838d5304]::passes::collect_trait_impls::collect_trait_impls
  23:     0x561e7e1e78ae - <rustc_session[b65adb5ed222d526]::session::Session>::time::<rustdoc[4d62e6a838d5304]::clean::types::Crate, rustdoc[4d62e6a838d5304]::core::run_global_ctxt::{closure#7}>
  24:     0x561e7e17a650 - rustdoc[4d62e6a838d5304]::core::run_global_ctxt
  25:     0x561e7e1e7b7c - <rustc_session[b65adb5ed222d526]::session::Session>::time::<(rustdoc[4d62e6a838d5304]::clean::types::Crate, rustdoc[4d62e6a838d5304]::config::RenderOptions, rustdoc[4d62e6a838d5304]::formats::cache::Cache), rustdoc[4d62e6a838d5304]::main_args::{closure#1}::{closure#0}::{closure#1}::{closure#0}>
  26:     0x561e7e25a26f - <rustc_interface[2984e52930de60b0]::passes::QueryContext>::enter::<rustdoc[4d62e6a838d5304]::main_args::{closure#1}::{closure#0}::{closure#1}, core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>>
  27:     0x561e7e0e9baa - <rustc_interface[2984e52930de60b0]::interface::Compiler>::enter::<rustdoc[4d62e6a838d5304]::main_args::{closure#1}::{closure#0}, core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>>
  28:     0x561e7e146e55 - rustc_span[fcb1f4a96315ac3a]::with_source_map::<core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>, rustc_interface[2984e52930de60b0]::interface::run_compiler<core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>, rustdoc[4d62e6a838d5304]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  29:     0x561e7dfc77e5 - <scoped_tls[8cc3120407342670]::ScopedKey<rustc_span[fcb1f4a96315ac3a]::SessionGlobals>>::set::<rustc_interface[2984e52930de60b0]::interface::run_compiler<core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>, rustdoc[4d62e6a838d5304]::main_args::{closure#1}>::{closure#0}, core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>>
  30:     0x561e7e1bce90 - std[84bdfa5f30581670]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[2984e52930de60b0]::util::run_in_thread_pool_with_globals<rustc_interface[2984e52930de60b0]::interface::run_compiler<core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>, rustdoc[4d62e6a838d5304]::main_args::{closure#1}>::{closure#0}, core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>>
  31:     0x561e7e2b24bd - <<std[84bdfa5f30581670]::thread::Builder>::spawn_unchecked_<rustc_interface[2984e52930de60b0]::util::run_in_thread_pool_with_globals<rustc_interface[2984e52930de60b0]::interface::run_compiler<core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>, rustdoc[4d62e6a838d5304]::main_args::{closure#1}>::{closure#0}, core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[20f247eb21f65857]::result::Result<(), rustc_errors[c36b833622a99705]::ErrorGuaranteed>>::{closure#1} as core[20f247eb21f65857]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  32:     0x7f3c19173343 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf16302793057de5b
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/alloc/src/boxed.rs:2000:9
  33:     0x7f3c19173343 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h98a6e7c9c7148daa
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/alloc/src/boxed.rs:2000:9
  34:     0x7f3c19173343 - std::sys::unix::thread::Thread::new::thread_start::h40d01ba5e8c2eb10
                               at /rustc/e1d819583f0bf13b016b119c1c2c43e6d3979450/library/std/src/sys/unix/thread.rs:108:17
  35:     0x7f3c18ec28fd - <unknown>
  36:     0x7f3c18f44a60 - <unknown>
  37:                0x0 - <unknown>
error: aborting due to 2 previous errors

Some errors have detailed explanations: E0107, E0227.
For more information about an error, try `rustc --explain E0107`.

[GuillaumeGomez]

Some news about this: #105457 is fixing this but is currently blocked on some compiler updates.