Closed
Description
Code
fn bug<'a>() {
[(); (|_: &'a u8| (), 0).1];
}Meta
rustc --version --verbose:
rustc 1.44.0 (49cae5576 2020-06-01)
rustc 1.45.0-beta.3359 (b7dc83a3f 2020-06-03)
rustc 1.46.0-nightly (4fb54ed48 2020-06-14)
Error output
error: internal compiler error: src/librustc_mir/borrow_check/universal_regions.rs:750: cannot convert `ReFree(DefId(0:3 ~ playground[5d24]::bug[0]), BrNamed(DefId(0:4 ~ playground[5d24]::bug[0]::'a[0]), 'a))` to a region vid
Backtrace
thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:904:9
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:1069
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1504
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:515
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_mir::borrow_check::universal_regions::UniversalRegionIndices::to_region_vid::{{closure}}
21: rustc_mir::borrow_check::universal_regions::UniversalRegionIndices::to_region_vid
22: <rustc_mir::borrow_check::type_check::relate_tys::NllTypeRelatingDelegate as rustc_infer::infer::nll_relate::TypeRelatingDelegate>::push_outlives
23: <rustc_infer::infer::nll_relate::TypeRelating<D> as rustc_middle::ty::relate::TypeRelation>::regions
24: rustc_middle::ty::relate::super_relate_tys
25: rustc_infer::infer::combine::<impl rustc_infer::infer::InferCtxt>::super_combine_tys
26: <rustc_infer::infer::nll_relate::TypeRelating<D> as rustc_middle::ty::relate::TypeRelation>::tys
27: rustc_mir::borrow_check::type_check::relate_tys::relate_types
28: rustc_mir::borrow_check::type_check::input_output::<impl rustc_mir::borrow_check::type_check::TypeChecker>::equate_normalized_input_or_output
29: rustc_mir::borrow_check::type_check::type_check
30: rustc_mir::borrow_check::nll::compute_regions
31: rustc_mir::borrow_check::do_mir_borrowck
32: rustc_middle::ty::context::GlobalCtxt::enter_local
33: rustc_mir::borrow_check::mir_borrowck
34: 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
35: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
36: rustc_query_system::query::plumbing::get_query
37: rustc_mir::borrow_check::type_check::TypeChecker::check_rvalue
38: rustc_mir::borrow_check::type_check::TypeChecker::typeck_mir
39: rustc_mir::borrow_check::type_check::type_check
40: rustc_mir::borrow_check::nll::compute_regions
41: rustc_mir::borrow_check::do_mir_borrowck
42: rustc_middle::ty::context::GlobalCtxt::enter_local
43: rustc_mir::borrow_check::mir_borrowck
44: 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
45: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
46: rustc_query_system::query::plumbing::get_query
47: rustc_query_system::query::plumbing::ensure_query
48: rustc_mir::transform::optimized_mir
49: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::optimized_mir>::compute
50: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
51: rustc_query_system::query::plumbing::get_query
52: rustc_mir::interpret::eval_context::InterpCx<M>::load_mir
53: rustc_mir::const_eval::eval_queries::const_eval_raw_provider
54: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_raw>::compute
55: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
56: rustc_query_system::query::plumbing::get_query
57: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
58: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute
59: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
60: rustc_query_system::query::plumbing::get_query
61: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_resolve
62: rustc_infer::infer::InferCtxt::const_eval_resolve
63: rustc_data_structures::obligation_forest::ObligationForest<O>::process_obligations
64: <rustc_trait_selection::traits::fulfill::FulfillmentContext as rustc_infer::traits::engine::TraitEngine>::select_where_possible
65: rustc_typeck::check::FnCtxt::resolve_vars_with_obligations
66: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
67: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
68: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
69: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
70: rustc_typeck::check::FnCtxt::check_stmt
71: rustc_typeck::check::FnCtxt::check_block_with_expected
72: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
73: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
74: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_return_expr
75: rustc_typeck::check::check_fn
76: rustc_infer::infer::InferCtxtBuilder::enter
77: rustc_typeck::check::typeck_tables_of
78: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::typeck_tables_of>::compute
79: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
80: rustc_query_system::query::plumbing::get_query
81: rustc_query_system::query::plumbing::ensure_query
82: rustc_typeck::check::typeck_item_bodies
83: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::typeck_item_bodies>::compute
84: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
85: rustc_query_system::query::plumbing::get_query
86: rustc_typeck::check_crate
87: rustc_interface::passes::analysis
88: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
89: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
90: rustc_query_system::query::plumbing::get_query
91: rustc_middle::ty::context::tls::enter_global
92: rustc_interface::interface::run_compiler_in_existing_thread_pool
93: scoped_tls::ScopedKey<T>::set
94: 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 1.44.0 (49cae5576 2020-06-01) running on x86_64-unknown-linux-gnu
note: compiler flags: -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_borrowck] borrow-checking `bug::{{constant}}#0::{{closure}}#0`
#1 [mir_borrowck] borrow-checking `bug::{{constant}}#0`
#2 [optimized_mir] processing `bug::{{constant}}#0`
#3 [const_eval_raw] const-evaluating `bug::{{constant}}#0`
#4 [const_eval_validated] const-evaluating + checking `bug::{{constant}}#0`
#5 [typeck_tables_of] type-checking `bug`
#6 [typeck_item_bodies] type-checking all item bodies
#7 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error
error: could not compile `playground`.