ICE: I'm not sure why

[richard-uk1]

Code

• Get the latest master of druid
• cd druid
• cargo clippy --manifest-path=druid/Cargo.toml --all-targets --features=image,im --target wasm32-unknown-unknown -- -D warnings

Meta

• cargo clippy -V: clippy 0.0.212 (18bf6b4 2020-10-07)
• rustc -Vv:

  rustc 1.47.0 (18bf6b4f0 2020-10-07)
  binary: rustc
  commit-hash: 18bf6b4f01a6feaf7259ba7cdae58031af1b7b39
  commit-date: 2020-10-07
  host: x86_64-unknown-linux-gnu
  release: 1.47.0
  LLVM version: 11.0
  

Error output

error output

    Checking druid-shell v0.6.0 (/home/me/devel/non-work/contrib/druid/druid-shell)
thread 'rustc' panicked at 'index out of bounds: the len is 1 but the index is 1', src/tools/clippy/clippy_lints/src/repeat_once.rs:44:93
stack backtrace:
   0: rust_begin_unwind
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:475
   1: core::panicking::panic_fmt
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/panicking.rs:85
   2: core::panicking::panic_bounds_check
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/panicking.rs:62
   3: <clippy_lints::repeat_once::RepeatOnce as rustc_lint::passes::LateLintPass>::check_expr
   4: <rustc_lint::late::LateLintPassObjects as rustc_lint::passes::LateLintPass>::check_expr
   5: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_expr
   6: rustc_hir::intravisit::walk_expr
   7: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_expr
   8: rustc_hir::intravisit::walk_expr
   9: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_expr
  10: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_nested_body
  11: rustc_hir::intravisit::walk_item
  12: rustc_hir::intravisit::Visitor::visit_nested_item
  13: rustc_hir::intravisit::walk_item
  14: rustc_hir::intravisit::Visitor::visit_nested_item
  15: rustc_hir::intravisit::walk_item
  16: rustc_hir::intravisit::Visitor::visit_nested_item
  17: rustc_hir::intravisit::walk_item
  18: rustc_hir::intravisit::Visitor::visit_nested_item
  19: rustc_hir::intravisit::walk_crate
  20: rustc_lint::late::late_lint_pass_crate
  21: rustc_lint::late::late_lint_crate
  22: rustc_data_structures::sync::join
  23: rustc_session::utils::<impl rustc_session::session::Session>::time
  24: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
  25: rustc_session::utils::<impl rustc_session::session::Session>::time
  26: rustc_interface::passes::analysis
  27: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
  28: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  29: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  30: rustc_data_structures::stack::ensure_sufficient_stack
  31: rustc_query_system::query::plumbing::get_query_impl
  32: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  33: rustc_span::with_source_map
  34: rustc_interface::interface::create_compiler_and_run
  35: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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-clippy/issues/new

note: Clippy version: clippy 0.0.212 (18bf6b4 2020-10-07)

query stack during panic:
#0 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `druid-shell`.

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

[ebroto]

Thanks for your report!

This was fixed in #5948 but did not make it to 1.47. It should be fixed in the current beta.

There's rust-lang/rust#77750 so in case there is a point release, the fix for this would make it.