RUSTLIB unexpected panic due to unstable fingerprints?

[nyanzebra]

Code

Seems to be in rustlib... will see if can find the MVE (minimal verifiable example)

<code>

Meta

rustc --version --verbose:

robertbaldwin@MacBook-Pro edgelet % rustc --version --verbose
rustc 1.52.0 (88f19c6da 2021-05-03)
binary: rustc
commit-hash: 88f19c6dab716c6281af7602e30f413e809c5974
commit-date: 2021-05-03
host: x86_64-apple-darwin
release: 1.52.0
LLVM version: 12.0.0

Error output

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 1.52.0 (88f19c6da 2021-05-03) running on x86_64-apple-darwin

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

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

query stack during panic:
#0 [predicates_of] computing predicates of `std::clone::Clone`
#1 [param_env] computing normalized predicates of `std::clone::Clone`
#2 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `edgelet-utils`

Backtrace

robertbaldwin@MacBook-Pro edgelet % RUST_BACKTRACE=1 cargo build
   Compiling openssl-errors v0.1.0
   Compiling openssl v0.10.30
   Compiling openssl-sys2 v0.1.0 (https://github.com/Azure/iot-identity-service?branch=main#68151be8)
   Compiling edgelet-utils v0.1.0 (/Users/robertbaldwin/Documents/GitHub/iotedge/edgelet/edgelet-utils)
thread 'rustc' panicked at 'found unstable fingerprints for predicates_of(core[7cda]::clone::Clone): GenericPredicates { parent: None, predicates: [(Binder(TraitPredicate(<Self as std::marker::Sized>)), /Users/robertbaldwin/.rustup/toolchains/1.52.0-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/clone.rs:108:18: 108:23 (#0)), (Binder(TraitPredicate(<Self as std::clone::Clone>)), /Users/robertbaldwin/.rustup/toolchains/1.52.0-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/clone.rs:108:1: 108:23 (#0))] }', /rustc/88f19c6dab716c6281af7602e30f413e809c5974/compiler/rustc_query_system/src/query/plumbing.rs:593:5
stack backtrace:
   0: _rust_begin_unwind
   1: std::panicking::begin_panic_fmt
   2: rustc_query_system::query::plumbing::incremental_verify_ich
   3: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
   4: rustc_data_structures::stack::ensure_sufficient_stack
   5: rustc_query_system::query::plumbing::get_query_impl
   6: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::predicates_of
   7: rustc_ty_utils::ty::param_env
   8: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
   9: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  10: rustc_data_structures::stack::ensure_sufficient_stack
  11: rustc_query_system::query::plumbing::get_query_impl
  12: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::param_env
  13: <rustc_lint::noop_method_call::NoopMethodCall as rustc_lint::passes::LateLintPass>::check_expr
  14: rustc_hir::intravisit::walk_expr
  15: rustc_hir::intravisit::walk_block
  16: rustc_hir::intravisit::walk_expr
  17: rustc_hir::intravisit::walk_body
  18: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_nested_body
  19: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_fn
  20: rustc_hir::intravisit::walk_impl_item
  21: rustc_hir::intravisit::Visitor::visit_nested_impl_item
  22: rustc_hir::intravisit::walk_item
  23: rustc_hir::intravisit::Visitor::visit_nested_item
  24: rustc_hir::intravisit::walk_item
  25: rustc_hir::intravisit::Visitor::visit_nested_item
  26: rustc_hir::intravisit::walk_crate
  27: rustc_lint::late::late_lint_crate
  28: rustc_data_structures::sync::join
  29: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
  30: rustc_session::utils::<impl rustc_session::session::Session>::time
  31: rustc_interface::passes::analysis
  32: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  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>::analysis
  38: rustc_interface::passes::QueryContext::enter
  39: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  40: rustc_span::with_source_map
  41: rustc_interface::interface::create_compiler_and_run
  42: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[nyanzebra]

Seems a cargo clean and then rebuilding resolved the issue for me

[Aaron1011]

See #84341. This is fixed in the latest nightly.

[nyanzebra]

Closing this, since there is a fix in nightly.