ICE casting a reference to a static closure as usize, inside array length

[DutchGhost]

This issue might be related to #52023 , which has been fixed in #52314

fn main() {
    [(); &(static |x| {}) as *const _ as usize]
}

playground link: https://play.rust-lang.org/?gist=b0d76bcfc33acb632a1527d8a9a97c84&version=nightly&mode=debug&edition=2015

Backtrace:

error[E0697]: closures cannot be static
   --> src\lib.rs:143:16
    |
143 |         [(); &(static |x| {}) as *const _ as usize]
    |                ^^^^^^^^^^

error: internal compiler error: librustc_mir\hair\cx\expr.rs:286: type of & not region
   --> src\lib.rs:143:15
    |
143 |         [(); &(static |x| {}) as *const _ as usize]
    |               ^^^^^^^^^^^^^^^

thread 'main' panicked at 'Box<Any>', librustc_errors\lib.rs:499:9
stack backtrace:
   0: <std::sys::windows::args::Args as core::ops::drop::Drop>::drop
   1: std::error::<impl core::convert::From<alloc::borrow::Cow<'b, str>> for alloc::boxed::Box<(dyn std::error::Error + core::marker::Sync + core::marker::Send + 'a)>>::from
   2: std::panicking::take_hook
   3: std::panicking::take_hook
   4: <rustc::ty::SymbolName as core::fmt::Display>::fmt
   5: std::panicking::rust_panic_with_hook
   6: <rustc_mir::dataflow::move_paths::indexes::BorrowIndex as rustc_data_structures::indexed_vec::Idx>::new
   7: <rustc_mir::dataflow::graphviz::Edge as core::fmt::Debug>::fmt
   8: <unknown>
   9: <unknown>
  10: <unknown>
  11: <unknown>
  12: <unknown>
  13: <unknown>
  14: rustc_mir::dataflow::move_paths::MoveData::gather_moves
  15: rustc_mir::hair::cx::expr::<impl rustc_mir::hair::Mirror<'tcx> for &'tcx rustc::hir::Expr>::make_mirror
  16: <rustc_mir::hair::ExprRef<'tcx> as rustc_mir::hair::Mirror<'tcx>>::make_mirror
  17: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  18: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  19: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  20: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  21: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  22: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  23: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  24: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  25: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  26: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  27: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  28: <rustc_mir::build::GlobalizeMir<'a, 'gcx> as rustc::mir::visit::MutVisitor<'tcx>>::visit_substs
  29: <unknown>
  30: <rustc_mir::interpret::eval_context::ValTy<'tcx> as core::fmt::Debug>::fmt
  31: rustc_mir::build::mir_build
  32: rustc_mir::transform::mir_built
  33: rustc::ty::query::on_disk_cache::__ty_decoder_impl::<impl serialize::serialize::Decoder for rustc::ty::query::on_disk_cache::CacheDecoder<'a, 'tcx, 'x>>::read_str
  34: rustc::ty::context::tls::track_diagnostic
  35: rustc::ty::context::tls::track_diagnostic
  36: rustc::dep_graph::graph::DepGraph::assert_ignored
  37: rustc::ty::context::tls::track_diagnostic
  38: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  39: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  40: rustc::ty::query::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::mir_built
  41: <rustc_mir::transform::check_unsafety::UnusedUnsafeVisitor<'a> as rustc::hir::intravisit::Visitor<'tcx>>::visit_block
  42: rustc::ty::query::on_disk_cache::__ty_decoder_impl::<impl serialize::serialize::Decoder for rustc::ty::query::on_disk_cache::CacheDecoder<'a, 'tcx, 'x>>::read_str
  43: rustc::ty::context::tls::track_diagnostic
  44: rustc::ty::context::tls::track_diagnostic
  45: rustc::dep_graph::graph::DepGraph::assert_ignored
  46: rustc::ty::context::tls::track_diagnostic
  47: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  48: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  49: rustc::ty::query::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::unsafety_check_result
  50: rustc_mir::transform::mir_const
  51: rustc::ty::query::on_disk_cache::__ty_decoder_impl::<impl serialize::serialize::Decoder for rustc::ty::query::on_disk_cache::CacheDecoder<'a, 'tcx, 'x>>::read_str
  52: rustc::ty::context::tls::track_diagnostic
  53: rustc::ty::context::tls::track_diagnostic
  54: rustc::dep_graph::graph::DepGraph::assert_ignored
  55: rustc::ty::context::tls::track_diagnostic
  56: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  57: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  58: rustc::ty::query::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::mir_const
  59: rustc_mir::transform::qualify_consts::provide
  60: rustc::ty::context::tls::track_diagnostic
  61: rustc::ty::context::tls::track_diagnostic
  62: rustc::dep_graph::graph::DepGraph::assert_ignored
  63: rustc::ty::context::tls::track_diagnostic
  64: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  65: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  66: rustc::ty::query::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::mir_const_qualif
  67: rustc_mir::interpret::const_eval::const_eval_provider
  68: rustc::ty::query::on_disk_cache::__ty_decoder_impl::<impl serialize::serialize::Decoder for rustc::ty::query::on_disk_cache::CacheDecoder<'a, 'tcx, 'x>>::read_str
  69: rustc::ty::context::tls::track_diagnostic
  70: rustc::ty::context::tls::track_diagnostic
  71: rustc::dep_graph::graph::DepGraph::assert_ignored
  72: rustc::ty::context::tls::track_diagnostic
  73: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  74: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  75: rustc::ty::query::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::const_eval
  76: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  77: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  78: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  79: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  80: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  81: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  82: <rustc_typeck::check::GatherLocalsVisitor<'a, 'gcx, 'tcx> as rustc::hir::intravisit::Visitor<'gcx>>::visit_pat
  83: <rustc_typeck::collect::has_late_bound_regions::LateBoundRegionsDetector<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_lifetime
  84: <rustc_typeck::check::method::probe::ProbeScope as core::fmt::Debug>::fmt
  85: <rustc_typeck::check::CheckItemTypesVisitor<'a, 'tcx> as rustc::hir::itemlikevisit::ItemLikeVisitor<'tcx>>::visit_item
  86: rustc::ty::query::on_disk_cache::__ty_decoder_impl::<impl serialize::serialize::Decoder for rustc::ty::query::on_disk_cache::CacheDecoder<'a, 'tcx, 'x>>::read_str
  87: rustc::ty::context::tls::track_diagnostic
  88: rustc::ty::context::tls::track_diagnostic
  89: rustc::dep_graph::graph::DepGraph::assert_ignored
  90: rustc::ty::context::tls::track_diagnostic
  91: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  92: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  93: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  94: <rustc_typeck::check::CheckItemTypesVisitor<'a, 'tcx> as rustc::hir::itemlikevisit::ItemLikeVisitor<'tcx>>::visit_item
  95: rustc::ty::context::tls::track_diagnostic
  96: rustc::ty::context::tls::track_diagnostic
  97: rustc::dep_graph::graph::DepGraph::assert_ignored
  98: rustc::ty::context::tls::track_diagnostic
  99: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
query stack during panic:
#0 [mir_built] processing `internal_compiler_errors::type_not_region::{{constant}}`
#1 [unsafety_check_result] processing `internal_compiler_errors::type_not_region::{{constant}}`
#2 [mir_const] processing `internal_compiler_errors::type_not_region::{{constant}}`
#3 [mir_const_qualif] processing `internal_compiler_errors::type_not_region::{{constant}}`
#4 [const_eval] const-evaluating `internal_compiler_errors::type_not_region::{{constant}}`
#5 [typeck_tables_of] processing `internal_compiler_errors::type_not_region`
#6 [typeck_item_bodies] type-checking all item bodies
end of query stack
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0697`.

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.29.0-nightly (31f1bc7b4 2018-07-15) running on x86_64-pc-windows-msvc

note: compiler flags: -C debuginfo=2 -C incremental --crate-type lib

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

error: Could not compile `test_bugs`.

[DutchGhost]

removing the argument inside the closure gives a different ICE. Interestingly stable refuses to compile this, but beta and nightly ICE's

fn main() {
    [(); &(static || {}) as *const _ as usize]
}

playground: https://play.rust-lang.org/?gist=e21e79c33b6428a56c0bb07df6f0a950&version=nightly&mode=debug&edition=2015

Backtrace:

error[E0697]: closures cannot be static
   --> src\lib.rs:154:16
    |
154 |         [(); &(static || {}) as *const _ as usize]
    |                ^^^^^^^^^

error[E0018]: raw pointers cannot be cast to integers in constants
   --> src\lib.rs:154:14
    |
154 |         [(); &(static || {}) as *const _ as usize]
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: internal compiler error: librustc\ty\sty.rs:2008: expected constant usize, got Const {
    ty: usize,
    val: Scalar(
        Ptr(
            Pointer {
                alloc_id: AllocId(
                    1
                ),
                offset: Size {
                    raw: 0
                }
            }
        )
    )
}

thread 'main' panicked at 'Box<Any>', librustc_errors\lib.rs:554:9
stack backtrace:
   0: <std::sys::windows::args::Args as core::ops::drop::Drop>::drop
   1: std::error::<impl core::convert::From<alloc::borrow::Cow<'b, str>> for alloc::boxed::Box<(dyn std::error::Error + core::marker::Sync + core::marker::Send + 'a)>>::from
   2: std::panicking::take_hook
   3: std::panicking::take_hook
   4: <rustc::ty::SymbolName as core::fmt::Display>::fmt
   5: std::panicking::rust_panic_with_hook
   6: <rustc_errors::emitter::ColorConfig as core::fmt::Debug>::fmt
   7: rustc_errors::Handler::bug
   8: rustc::session::config::Externs::new
   9: rustc::ty::context::tls::track_diagnostic
  10: rustc::ty::context::tls::track_diagnostic
  11: rustc::ty::context::tls::track_diagnostic
  12: rustc::session::bug_fmt
  13: rustc::session::bug_fmt
  14: rustc::ty::context::tls::track_diagnostic
  15: rustc::util::ppaux::<impl core::fmt::Debug for rustc::ty::sty::TraitRef<'tcx>>::fmt
  16: <rustc::util::common::ErrorReported as core::fmt::Debug>::fmt
  17: core::fmt::write
  18: alloc::fmt::format
  19: rustc::infer::error_reporting::<impl rustc::infer::InferCtxt<'a, 'gcx, 'tcx>>::report_region_errors
  20: rustc::infer::error_reporting::<impl rustc::infer::InferCtxt<'a, 'gcx, 'tcx>>::report_and_explain_type_error
  21: rustc::infer::error_reporting::<impl rustc::infer::InferCtxt<'a, 'gcx, 'tcx>>::note_type_err
  22: rustc::infer::error_reporting::<impl rustc::infer::InferCtxt<'a, 'gcx, 'tcx>>::report_and_explain_type_error
  23: rustc::infer::InferCtxt::report_mismatched_types
  24: <rustc_typeck::coherence::orphan::OrphanChecker<'cx, 'tcx> as rustc::hir::itemlikevisit::ItemLikeVisitor<'v>>::visit_impl_item
  25: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  26: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  27: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  28: <rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx> as rustc_typeck::astconv::AstConv<'gcx, 'tcx>>::record_ty
  29: <rustc_typeck::check::GatherLocalsVisitor<'a, 'gcx, 'tcx> as rustc::hir::intravisit::Visitor<'gcx>>::visit_pat
  30: <rustc_typeck::collect::has_late_bound_regions::LateBoundRegionsDetector<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_lifetime
  31: <rustc_typeck::check::method::probe::ProbeScope as core::fmt::Debug>::fmt
  32: <rustc_typeck::check::CheckItemTypesVisitor<'a, 'tcx> as rustc::hir::itemlikevisit::ItemLikeVisitor<'tcx>>::visit_item
  33: rustc::ty::query::on_disk_cache::__ty_decoder_impl::<impl serialize::serialize::Decoder for rustc::ty::query::on_disk_cache::CacheDecoder<'a, 'tcx, 'x>>::read_str
  34: rustc::ty::context::tls::track_diagnostic
  35: rustc::ty::context::tls::track_diagnostic
  36: rustc::dep_graph::graph::DepGraph::assert_ignored
  37: rustc::ty::context::tls::track_diagnostic
  38: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  39: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  40: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  41: <rustc_typeck::check::CheckItemTypesVisitor<'a, 'tcx> as rustc::hir::itemlikevisit::ItemLikeVisitor<'tcx>>::visit_item
  42: rustc::ty::context::tls::track_diagnostic
  43: rustc::ty::context::tls::track_diagnostic
  44: rustc::dep_graph::graph::DepGraph::assert_ignored
  45: rustc::ty::context::tls::track_diagnostic
  46: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  47: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_print_query_stack
  48: rustc_typeck::check_crate
  49: <unknown>
  50: <rustc_driver::derive_registrar::Finder as rustc::hir::itemlikevisit::ItemLikeVisitor<'v>>::visit_impl_item
  51: <rustc_driver::Compilation as core::fmt::Debug>::fmt
  52: rustc_driver::driver::compile_input
  53: rustc_driver::run_compiler
  54: rustc_driver::target_features::add_configuration
  55: <unknown>
  56: _rust_maybe_catch_panic
  57: rustc_driver::profile::dump
  58: rustc_driver::main
  59: <unknown>
  60: std::panicking::update_panic_count
  61: _rust_maybe_catch_panic
  62: std::rt::lang_start_internal
  63: <unknown>
  64: <unknown>
  65: BaseThreadInitThunk
  66: RtlUserThreadStart
query stack during panic:
#0 [typeck_tables_of] processing `internal_compiler_errors::expected_const_got`
#1 [typeck_item_bodies] type-checking all item bodies
end of query stack
error: aborting due to 3 previous errors

Some errors occurred: E0018, E0697.
For more information about an error, try `rustc --explain E0018`.

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.29.0-nightly (31f1bc7b4 2018-07-15) running on x86_64-pc-windows-msvc

note: compiler flags: -C debuginfo=2 -C incremental --crate-type lib

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

error: Could not compile `test_bugs`.

[DutchGhost]

UPDATE:

fn main() {
    [(); &(static || {}) as *const _ as usize]
}

now also ICE's in stable.

[DutchGhost]

UPDATE:

fn main() {
    [(); &(static || {}) as *const _ as usize]
}

now also ICE's in stable.

Now no longer ICE's since 1.32.

[JohnTitor]

The ICE doesn't appear on the latest nightly via the above playground link, marked as E-needstest