Closed
Description
Code
#![feature(impl_trait_in_bindings)]
const _: impl Fn() = ||();Meta
rustc --version --verbose:
1.45.0-nightly (2020-06-03 56daaf669ebc3d5083db)
Error output
warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
--> src/lib.rs:1:12
|
1 | #![feature(impl_trait_in_bindings)]
| ^^^^^^^^^^^^^^^^^^^^^^
|
= note: `#[warn(incomplete_features)]` on by default
= note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
error: internal compiler error: src/librustc_trait_selection/traits/structural_match.rs:216: unexpected type during structural-match checking: [closure@src/lib.rs:2:22: 2:31]
thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:907:9
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/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.45.0-nightly (56daaf669 2020-06-03) running on x86_64-unknown-linux-gnu
note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type lib
note: some of the compiler flags provided by cargo are hidden
error: aborting due to previous error; 1 warning emitted
error: could not compile `playground`.
To learn more, run the command again with --verbose.
Backtrace
error: internal compiler error: src/librustc_trait_selection/traits/structural_match.rs:216: unexpected type during structural-match checking: [closure@src/lib.rs:2:22: 2:31]
thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:907:9
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:78
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:59
4: core::fmt::write
at src/libcore/fmt/mod.rs:1076
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1537
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:62
7: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:49
8: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:198
9: std::panicking::default_hook
at src/libstd/panicking.rs:218
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:490
12: std::panicking::begin_panic
13: rustc_errors::HandlerInner::bug
14: rustc_errors::Handler::bug
15: rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}
16: rustc_middle::ty::context::tls::with_opt::{{closure}}
17: rustc_middle::ty::context::tls::with_opt
18: rustc_middle::util::bug::opt_span_bug_fmt
19: rustc_middle::util::bug::bug_fmt
20: <rustc_trait_selection::traits::structural_match::Search as rustc_middle::ty::fold::TypeVisitor>::visit_ty
21: rustc_middle::ty::context::GlobalCtxt::enter_local
22: rustc_trait_selection::traits::structural_match::search_for_structural_match_violation
23: <rustc_mir::transform::check_consts::qualifs::CustomEq as rustc_mir::transform::check_consts::qualifs::Qualif>::in_any_value_of_ty
24: rustc_mir::transform::check_consts::validation::Validator::qualifs_in_return_place
25: rustc_mir::transform::mir_const_qualif
26: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_const_qualif>::compute
27: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
28: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
29: rustc_query_system::query::plumbing::get_query_impl
30: rustc_mir::transform::mir_validated
31: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_validated>::compute
32: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
33: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
34: rustc_query_system::query::plumbing::get_query_impl
35: rustc_mir::borrow_check::mir_borrowck
36: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_borrowck>::compute
37: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
38: rustc_data_structures::stack::ensure_sufficient_stack
39: rustc_query_system::query::plumbing::get_query_impl
40: rustc_typeck::collect::type_of::find_opaque_ty_constraints::ConstraintLocator::check
41: rustc_typeck::collect::type_of::find_opaque_ty_constraints
42: rustc_typeck::collect::type_of::type_of
43: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::type_of>::compute
44: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
45: rustc_data_structures::stack::ensure_sufficient_stack
46: rustc_query_system::query::plumbing::get_query_impl
47: rustc_query_system::query::plumbing::ensure_query_impl
48: <rustc_typeck::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
49: rustc_middle::hir::map::Map::visit_item_likes_in_module
50: rustc_typeck::collect::collect_mod_item_types
51: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_mod_item_types>::compute
52: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
53: rustc_data_structures::stack::ensure_sufficient_stack
54: rustc_query_system::query::plumbing::get_query_impl
55: rustc_query_system::query::plumbing::ensure_query_impl
56: rustc_session::session::Session::track_errors
57: rustc_typeck::check_crate
58: rustc_interface::passes::analysis
59: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
60: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
61: rustc_data_structures::stack::ensure_sufficient_stack
62: rustc_query_system::query::plumbing::get_query_impl
63: rustc_middle::ty::context::tls::enter_global
64: rustc_interface::interface::run_compiler_in_existing_thread_pool
65: rustc_ast::attr::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
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 1.45.0-nightly (56daaf669 2020-06-03) running on x86_64-unknown-linux-gnu
note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type lib
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
#0 [mir_const_qualif] const checking `_`
#1 [mir_validated] processing `_`
#2 [mir_borrowck] borrow-checking `_`
#3 [type_of] computing type of `_::{{opaque}}#0`
#4 [collect_mod_item_types] collecting item types in top-level module
#5 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error; 1 warning emitted
error: could not compile `playground`.