Closed
Description
The following code ICE's on stable, beta and nightly:
use core::mem::size_of;
struct Bug<'s> {
array: [(); size_of::<&Self>()],
}
Backtrace:
Compiling playground v0.0.1 (/playground)
error: internal compiler error: src/librustc_mir/borrow_check/nll/universal_regions.rs:741: cannot convert `ReEarlyBound(0, 's)` to a region vid
thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:650:9
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:47
3: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:36
4: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:200
5: std::panicking::default_hook
at src/libstd/panicking.rs:214
6: rustc::util::common::panic_hook
7: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:481
8: std::panicking::begin_panic
9: rustc_errors::Handler::bug
10: rustc::util::bug::opt_span_bug_fmt::{{closure}}
11: rustc::ty::context::tls::with_opt::{{closure}}
12: rustc::ty::context::tls::with_context_opt
13: rustc::ty::context::tls::with_opt
14: rustc::util::bug::opt_span_bug_fmt
15: rustc::util::bug::bug_fmt
16: rustc_mir::borrow_check::nll::universal_regions::UniversalRegionIndices::to_region_vid::{{closure}}
17: rustc_mir::borrow_check::nll::type_check::constraint_conversion::ConstraintConversion::to_region_vid
18: rustc_mir::borrow_check::nll::type_check::constraint_conversion::ConstraintConversion::convert_all
19: rustc_mir::borrow_check::nll::type_check::TypeChecker::fully_perform_op
20: rustc_mir::borrow_check::nll::type_check::type_check
21: rustc_mir::borrow_check::nll::compute_regions
22: rustc_mir::borrow_check::do_mir_borrowck
23: rustc::ty::context::GlobalCtxt::enter_local
24: rustc_mir::borrow_check::mir_borrowck
25: rustc::ty::query::__query_compute::mir_borrowck
26: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::mir_borrowck>::compute
27: rustc::dep_graph::graph::DepGraph::with_task_impl
28: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
29: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::ensure_query
30: rustc_mir::transform::optimized_mir
31: rustc::ty::query::__query_compute::optimized_mir
32: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::optimized_mir>::compute
33: rustc::dep_graph::graph::DepGraph::with_task_impl
34: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
35: rustc_mir::interpret::eval_context::InterpretCx<M>::load_mir
36: rustc_mir::const_eval::const_eval_raw_provider
37: rustc::ty::query::__query_compute::const_eval_raw
38: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::const_eval_raw>::compute
39: rustc::dep_graph::graph::DepGraph::with_task_impl
40: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
41: rustc_mir::const_eval::const_eval_provider
42: rustc::ty::query::__query_compute::const_eval
43: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::const_eval>::compute
44: rustc::dep_graph::graph::DepGraph::with_task_impl
45: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
46: <rustc::traits::project::AssocTypeNormalizer as rustc::ty::fold::TypeFolder>::fold_const
47: rustc::ty::structural_impls::<impl rustc::ty::fold::TypeFoldable for &rustc::ty::TyS>::super_fold_with
48: <rustc::traits::project::AssocTypeNormalizer as rustc::ty::fold::TypeFolder>::fold_ty
49: rustc::traits::project::normalize
50: rustc_typeck::check::FnCtxt::normalize_associated_types_in
51: <core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
52: rustc::ty::context::GlobalCtxt::enter_local
53: rustc_typeck::check::wfcheck::check_item_well_formed
54: rustc::ty::query::__query_compute::check_item_well_formed
55: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::check_item_well_formed>::compute
56: rustc::dep_graph::graph::DepGraph::with_task_impl
57: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
58: <rustc_typeck::check::wfcheck::CheckTypeWellFormedVisitor as rustc::hir::itemlikevisit::ParItemLikeVisitor>::visit_item
59: __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:82
60: rustc_data_structures::sync::par_for_each_in
61: __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:82
62: rustc::hir::Crate::par_visit_all_item_likes
63: rustc::util::common::time
64: rustc_typeck::check_crate
65: rustc_interface::passes::analysis
66: rustc::ty::query::__query_compute::analysis
67: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::analysis>::compute
68: rustc::dep_graph::graph::DepGraph::with_task_impl
69: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
70: rustc::ty::context::tls::enter_global
71: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
72: rustc_interface::passes::create_global_ctxt::{{closure}}
73: rustc_interface::interface::run_compiler_in_existing_thread_pool
74: std::thread::local::LocalKey<T>::with
75: scoped_tls::ScopedKey<T>::set
76: syntax::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
query stack during panic:
#0 [mir_borrowck] processing `Bug::array::{{constant}}#0`
#1 [optimized_mir] processing `Bug::array::{{constant}}#0`
--> src/lib.rs:4:17
|
4 | array: [(); size_of::<&Self>()],
| ^^^^^^^^^^^^^^^^^^
#2 [const_eval_raw] const-evaluating `Bug::array::{{constant}}#0`
#3 [const_eval] const-evaluating + checking `Bug::array::{{constant}}#0`
#4 [check_item_well_formed] processing `Bug`
#5 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error
Feel free to close if this is a duplicate of #56445.
What I noticed is that when the lifetime is removed, it just compiles fine:
use core::mem::size_of;
struct Bug {
array: [(); size_of::<&Self>()],
}
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Area: Non-lexical lifetimes (NLL)Call for participation: Hard difficulty. Experience needed to fix: A lot.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Medium priorityRelevant to the compiler team, which will review and decide on the PR/issue.ICE tracked in rust-lang/glacier.