ICE with invalid generics to std::slice::Iter

[K4rakara]

Code

extern crate rand;

#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub struct PieceShape([(isize, isize); 4]);
impl PieceShape {
    pub fn iter(&self) -> std::slice::Iter<Item = (isize, isize)> {
        self.0.iter()
    }
    pub fn iter_mut(&mut self) -> std::slice::IterMut<Item = (isize, isize)> {
        self.0.iter_mut()
    }
}

fn main() {
    
}

Meta

rustc --version --verbose:

rustc 1.53.0-nightly (7af1f55ae 2021-04-15)
binary: rustc
commit-hash: 7af1f55ae359e731c2c303f5d98e42a1a8163af0
commit-date: 2021-04-15
host: x86_64-unknown-linux-gnu
release: 1.53.0-nightly
LLVM version: 12.0.0

Error output

   Compiling rust-repo v0.1.0 (/tmp/rust-repo)
error: internal compiler error: compiler/rustc_metadata/src/rmeta/decoder.rs:1233:18: cannot get associated-item of `DefKey { parent: Some(DefIndex(9472)), disambiguated_data: DisambiguatedDefPathData { data: ValueNs("ptr"), disambiguator: 0 } }`

thread 'rustc' panicked at 'Box<Any>', /rustc/7af1f55ae359e731c2c303f5d98e42a1a8163af0/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 (7af1f55ae 2021-04-15) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

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

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

error: could not compile `rust-repo`

To learn more, run the command again with --verbose.

Backtrace

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_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  11: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  12: rustc_data_structures::stack::ensure_sufficient_stack
  13: rustc_query_system::query::plumbing::force_query_with_job
  14: rustc_query_system::query::plumbing::get_query_impl
  15: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::associated_item
  16: <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
  17: <alloc::vec::Vec<T> as alloc::vec::spec_from_iter::SpecFromIter<T,I>>::from_iter
  18: rustc_ty_utils::ty::associated_items
  19: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::associated_items>::compute
  20: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  21: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  22: rustc_data_structures::stack::ensure_sufficient_stack
  23: rustc_query_system::query::plumbing::force_query_with_job
  24: rustc_query_system::query::plumbing::get_query_impl
  25: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::associated_items
  26: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_path
  27: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_ty
  28: rustc_resolve::late::lifetimes::LifetimeContext::visit_fn_like_elision
  29: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_fn
  30: rustc_hir::intravisit::walk_impl_item
  31: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_impl_item
  32: rustc_hir::intravisit::walk_item
  33: <rustc_resolve::late::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_item
  34: rustc_resolve::late::lifetimes::do_resolve
  35: rustc_resolve::late::lifetimes::resolve_lifetimes
  36: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::resolve_lifetimes>::compute
  37: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  38: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  39: rustc_data_structures::stack::ensure_sufficient_stack
  40: rustc_query_system::query::plumbing::force_query_with_job
  41: rustc_query_system::query::plumbing::get_query_impl
  42: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::resolve_lifetimes
  43: rustc_resolve::late::lifetimes::resolve_lifetimes_for
  44: core::ops::function::FnOnce::call_once
  45: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  46: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  47: rustc_query_system::query::plumbing::force_query_with_job
  48: rustc_query_system::query::plumbing::get_query_impl
  49: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::named_region_map
  50: rustc_middle::ty::context::TyCtxt::named_region
  51: rustc_hir::intravisit::walk_ty
  52: rustc_hir::intravisit::walk_fn_decl
  53: rustc_typeck::collect::generics_of
  54: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::generics_of>::compute
  55: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  56: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  57: rustc_data_structures::stack::ensure_sufficient_stack
  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>::generics_of
  61: <rustc_typeck::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_impl_item
  62: rustc_middle::hir::map::Map::visit_item_likes_in_module
  63: rustc_typeck::collect::collect_mod_item_types
  64: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  65: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  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>::collect_mod_item_types
  69: rustc_session::session::Session::track_errors
  70: rustc_typeck::check_crate
  71: rustc_interface::passes::analysis
  72: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  73: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  74: rustc_data_structures::stack::ensure_sufficient_stack
  75: rustc_query_system::query::plumbing::force_query_with_job
  76: rustc_query_system::query::plumbing::get_query_impl
  77: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  78: rustc_interface::passes::QueryContext::enter
  79: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  80: rustc_span::with_source_map
  81: rustc_interface::interface::create_compiler_and_run
  82: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[LeSeulArtichaut]

I can't reproduce this on the playground. @K4rakara does running cargo clean and re-building make the ICE disappear?

[K4rakara]

yeah, still occurs after running cargo clean and rebuilding

[apiraino]

@K4rakara does it also reproduce with others rust versions? Can you try latest nightly or a beta/stable? it could help us pointing out a specific release (if any) where this happens. thanks!

[K4rakara]

@apiraino: On both 1.54.0-nighty (5c02926) and 1.53.0-beta.2 (4bac69d) it does not reproduce, so theres a chance this has been fixed already

[LeSeulArtichaut]

This was fixed by #83944

[apiraino]

Thanks for the feedback, in this case I'll close this issue as duplicate