error: at least one trait must be specified
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:3:19
  |
3 | fn not_field() -> impl {
  |                   ^^^^

error[E0412]: cannot find type `T` in this scope
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:2:16
  |
2 | struct NonZero(T);
  |               -^ not found in this scope
  |               |
  |               help: you might be missing a type parameter: `<T>`

error[E0658]: the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable niche optimizations in libcore and will never be stable
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:1
  |
1 | #[rustc_layout_scalar_valid_range_start(rustc_layout_scalar_valid_range_start)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable

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 | / #[rustc_layout_scalar_valid_range_start(rustc_layout_scalar_valid_range_start)]
2 | | struct NonZero(T);
3 | | fn not_field() -> impl {
4 | |     NonZero(false)
5 | | }
  | |_^ consider adding a `main` function to `perses_node_priority_with_dfs_delta_reduced_mutant.rs`

error: expected exactly one integer literal argument
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:1
  |
1 | #[rustc_layout_scalar_valid_range_start(rustc_layout_scalar_valid_range_start)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at 'attribute takes lit', compiler/rustc_middle/src/ty/context.rs:1095:38
stack backtrace:
   0: rust_begin_unwind
             at /rustc/107896c32d5dda4db508968ff34997a39d286966/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/107896c32d5dda4db508968ff34997a39d286966/library/core/src/panicking.rs:92:14
   2: core::option::expect_failed
             at /rustc/107896c32d5dda4db508968ff34997a39d286966/library/core/src/option.rs:1321:5
   3: rustc_middle::ty::context::TyCtxt::layout_scalar_valid_range::{{closure}}
   4: rustc_middle::ty::context::TyCtxt::layout_scalar_valid_range
   5: <rustc_mir::transform::check_unsafety::UnsafetyChecker as rustc_middle::mir::visit::Visitor>::visit_rvalue
   6: rustc_mir::transform::check_unsafety::unsafety_check_result
   7: core::ops::function::FnOnce::call_once
   8: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
   9: rustc_query_system::query::plumbing::force_query_with_job
  10: rustc_query_system::query::plumbing::get_query_impl
  11: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::unsafety_check_result
  12: rustc_mir::transform::mir_const
  13: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  14: rustc_query_system::query::plumbing::force_query_with_job
  15: rustc_query_system::query::plumbing::get_query_impl
  16: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_const
  17: rustc_mir::transform::mir_promoted
  18: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  19: rustc_query_system::query::plumbing::force_query_with_job
  20: rustc_query_system::query::plumbing::get_query_impl
  21: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_promoted
  22: rustc_mir::borrow_check::mir_borrowck
  23: core::ops::function::FnOnce::call_once
  24: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  25: rustc_query_system::query::plumbing::force_query_with_job
  26: rustc_query_system::query::plumbing::get_query_impl
  27: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_borrowck
  28: rustc_typeck::collect::type_of::type_of
  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::force_query_with_job
  32: rustc_query_system::query::plumbing::get_query_impl
  33: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::type_of
  34: rustc_typeck::check::check::check_opaque
  35: rustc_typeck::check::check::check_item_type
  36: rustc_middle::hir::map::Map::visit_item_likes_in_module
  37: rustc_typeck::check::check::check_mod_item_types
  38: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  39: rustc_query_system::query::plumbing::force_query_with_job
  40: rustc_query_system::query::plumbing::get_query_impl
  41: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::check_mod_item_types
  42: rustc_session::utils::<impl rustc_session::session::Session>::time
  43: rustc_typeck::check_crate
  44: rustc_interface::passes::analysis
  45: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  46: rustc_data_structures::stack::ensure_sufficient_stack
  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>::analysis
  50: rustc_interface::passes::QueryContext::enter
  51: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  52: rustc_span::with_source_map
  53: 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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.52.0-nightly (107896c32 2021-03-15) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [unsafety_check_result] unsafety-checking `not_field`
#1 [mir_const] processing MIR for `not_field`
#2 [mir_promoted] processing `not_field`
#3 [mir_borrowck] borrow-checking `not_field`
#4 [type_of] computing type of `not_field::{opaque#0}`
#5 [check_mod_item_types] checking item types in top-level module
#6 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 5 previous errors

Some errors have detailed explanations: E0412, E0601, E0658.
For more information about an error, try `rustc --explain E0412`.