ICE: compiler/rustc_metadata/src/rmeta/decoder.rs:1233:18: cannot get associated-item of `DefKey { parent: Some(DefIndex(37465)), disambiguated_data: DisambiguatedDefPathData { data: TypeNs("None"), disambiguator: 0 } }`

[chengniansun]

Code

fn func2(_x: Option<Target = Option>) {}

Meta

rustc --version --verbose:

rustc 1.53.0-nightly (0b417ab5c 2021-04-03)
binary: rustc
commit-hash: 0b417ab5cdfdedffd74fb22cf22d27033c851304
commit-date: 2021-04-03
host: x86_64-unknown-linux-gnu
release: 1.53.0-nightly
LLVM version: 12.0.0

Error output

error[E0601]: `main` function not found in crate `perses_node_priority_with_dfs_delta_reduced_mutant`
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:1
  |
1 | fn func2(_x: Option<Target = Option>) {}
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ consider adding a `main` function to `perses_node_priority_with_dfs_delta_reduced_mutant.rs`

error: internal compiler error: compiler/rustc_metadata/src/rmeta/decoder.rs:1233:18: cannot get associated-item of `DefKey { parent: Some(DefIndex(37465)), disambiguated_data: DisambiguatedDefPathData { data: TypeNs("None"), disambiguator: 0 } }`

thread 'rustc' panicked at 'Box<Any>', /rustc/0b417ab5cdfdedffd74fb22cf22d27033c851304/library/std/src/panic.rs:59:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

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 1.53.0-nightly (0b417ab5c 2021-04-03) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [associated_item] computing associated item data for `std::prelude::v1::None`
#1 [associated_items] collecting associated items of std::option::Option
end of query stack
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0601`.

Backtrace

error[E0601]: `main` function not found in crate `perses_node_priority_with_dfs_delta_reduced_mutant`
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:1
  |
1 | fn func2(_x: Option<Target = Option>) {}
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ consider adding a `main` function to `perses_node_priority_with_dfs_delta_reduced_mutant.rs`

error: internal compiler error: compiler/rustc_metadata/src/rmeta/decoder.rs:1233:18: cannot get associated-item of `DefKey { parent: Some(DefIndex(37465)), disambiguated_data: DisambiguatedDefPathData { data: TypeNs("None"), disambiguator: 0 } }`

thread 'rustc' panicked at 'Box<Any>', /rustc/0b417ab5cdfdedffd74fb22cf22d27033c851304/library/std/src/panic.rs:59:5
stack backtrace:
   0: std::panicking::begin_panic
   1: std::panic::panic_any
   2: rustc_errors::HandlerInner::bug
   3: rustc_errors::Handler::bug
   4: rustc_middle::ty::context::tls::with_opt
   5: rustc_middle::util::bug::opt_span_bug_fmt
   6: rustc_middle::util::bug::bug_fmt
   7: rustc_metadata::rmeta::decoder::<impl rustc_metadata::creader::CrateMetadataRef>::get_associated_item
   8: rustc_metadata::rmeta::decoder::cstore_impl::provide_extern::associated_item
   9: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::associated_item>::compute
  10: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  11: rustc_data_structures::stack::ensure_sufficient_stack
  12: rustc_query_system::query::plumbing::force_query_with_job
  13: rustc_query_system::query::plumbing::get_query_impl
  14: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::associated_item
  15: <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
  16: <alloc::vec::Vec<T> as alloc::vec::spec_from_iter::SpecFromIter<T,I>>::from_iter
  17: rustc_ty_utils::ty::associated_items
  18: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::associated_items>::compute
  19: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  20: rustc_data_structures::stack::ensure_sufficient_stack
  21: rustc_query_system::query::plumbing::force_query_with_job
  22: rustc_query_system::query::plumbing::get_query_impl
  23: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::associated_items
  24: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_path
  25: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_ty
  26: rustc_resolve::late::lifetimes::LifetimeContext::visit_fn_like_elision
  27: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_fn
  28: rustc_hir::intravisit::walk_item
  29: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_item
  30: rustc_resolve::late::lifetimes::do_resolve
  31: rustc_resolve::late::lifetimes::resolve_lifetimes
  32: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::resolve_lifetimes>::compute
  33: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  34: rustc_data_structures::stack::ensure_sufficient_stack
  35: rustc_query_system::query::plumbing::force_query_with_job
  36: rustc_query_system::query::plumbing::get_query_impl
  37: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::resolve_lifetimes
  38: rustc_resolve::late::lifetimes::resolve_lifetimes_for
  39: core::ops::function::FnOnce::call_once
  40: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  41: rustc_query_system::query::plumbing::force_query_with_job
  42: rustc_query_system::query::plumbing::get_query_impl
  43: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::late_bound_vars_map
  44: rustc_middle::ty::context::TyCtxt::late_bound_vars
  45: <dyn rustc_typeck::astconv::AstConv>::ty_of_fn
  46: rustc_typeck::collect::fn_sig
  47: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::fn_sig>::compute
  48: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  49: rustc_data_structures::stack::ensure_sufficient_stack
  50: rustc_query_system::query::plumbing::force_query_with_job
  51: rustc_query_system::query::plumbing::get_query_impl
  52: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::fn_sig
  53: rustc_typeck::collect::convert_item
  54: <rustc_typeck::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
  55: rustc_middle::hir::map::Map::visit_item_likes_in_module
  56: rustc_typeck::collect::collect_mod_item_types
  57: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  58: rustc_query_system::query::plumbing::force_query_with_job
  59: rustc_query_system::query::plumbing::get_query_impl
  60: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::collect_mod_item_types
  61: rustc_session::session::Session::track_errors
  62: rustc_typeck::check_crate
  63: rustc_interface::passes::analysis
  64: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  65: rustc_data_structures::stack::ensure_sufficient_stack
  66: rustc_query_system::query::plumbing::force_query_with_job
  67: rustc_query_system::query::plumbing::get_query_impl
  68: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  69: rustc_interface::passes::QueryContext::enter
  70: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  71: rustc_span::with_source_map
  72: rustc_interface::interface::create_compiler_and_run
  73: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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 1.53.0-nightly (0b417ab5c 2021-04-03) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [associated_item] computing associated item data for `std::prelude::v1::None`
#1 [associated_items] collecting associated items of std::option::Option
#2 [resolve_lifetimes] resolving lifetimes
#3 [late_bound_vars_map] looking up late bound vars
#4 [fn_sig] computing function signature of `func2`
#5 [collect_mod_item_types] collecting item types in top-level module
#6 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0601`.

[SNCPlay42]

Output on stable 1.51 and beta:

error[E0107]: missing generics for enum `Option`
   --> <source>:1:14
    |
1   | fn func2(_x: Option<Target = Option>) {}
    |              ^^^^^^ expected 1 type argument
    |
note: enum defined here, with 1 type parameter: `T`
help: use angle brackets to add missing type argument
    |
1   | fn func2(_x: Option<T><Target = Option>) {}
    |                    ^^^

error[E0107]: missing generics for enum `Option`
   --> <source>:1:30
    |
1   | fn func2(_x: Option<Target = Option>) {}
    |                              ^^^^^^ expected 1 type argument
    |
note: enum defined here, with 1 type parameter: `T`
help: use angle brackets to add missing type argument
    |
1   | fn func2(_x: Option<Target = Option<T>>) {}
    |                                    ^^^

error[E0229]: associated type bindings are not allowed here
 --> <source>:1:21
  |
1 | fn func2(_x: Option<Target = Option>) {}
  |                     ^^^^^^^^^^^^^^^ associated type not allowed here

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0107, E0229.
For more information about an error, try `rustc --explain E0107`.

---

searched nightlies: from nightly-2021-03-20 to nightly-2021-04-04
regressed nightly: nightly-2021-04-01
searched commits: from 74874a6 to 4fdac23
regressed commit: 4fdac23 (#76814)

bisected with cargo-bisect-rustc v0.6.0

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc --preserve --regress=ice --start=2021-03-20 -- check 

---

@rustbot label regression-from-stable-to-nightly

[SNCPlay42]

This looks very similar to #83753.

[apiraino]

Also, bisection of #83753 points to the same commit: could this issue be a duplicate?

[apiraino]

Assigning priority as discussed as part of the Prioritization Working Group procedure and removing I-prioritize.

@rustbot label -I-prioritize +P-medium

[wfxr]

Repro in another slight different form on nightly-2021-04-13:

echo 'fn foo() -> std::iter::Map<Item = i32> { unimplemented!() }' | rustc - --crate-type=lib

Error output:

error: internal compiler error: compiler/rustc_metadata/src/rmeta/decoder.rs:1233:18: cannot get associated-item of `DefKey { parent: Some(DefIndex(38829)), disambiguated_data: DisambiguatedDefPathData { data: ValueNs("iter"), disambiguator: 0 } }`

thread 'rustc' panicked at 'Box<Any>', /rustc/132b4e5d167b7e622fcc11fa2b67b931105b4de1/library/std/src/panic.rs:59:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

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 1.53.0-nightly (132b4e5d1 2021-04-13) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib

query stack during panic:
#0 [associated_item] computing associated item data for `std::iter::Map::iter`
#1 [associated_items] collecting associated items of std::iter::Map
end of query stack
error: aborting due to previous error