Closed
Description
When creating a lazy_static
with a reference to a trait object, I get an internal compiler error (only on nightly).
Here's a minimal example: (playground link)
lazy_static::lazy_static! {
static ref X: &dyn std::any::Any = ();
}
On stable and beta this gives a expected error message, but on nightly it causes an ICE.
Meta
Output from rustc --version --verbose
:
rustc 1.42.0-nightly (c2d141df5 2020-01-24)
binary: rustc
commit-hash: c2d141df59703393c0c683abc259f9a8c3be041a
commit-date: 2020-01-24
host: x86_64-unknown-linux-gnu
release: 1.42.0-nightly
LLVM version: 9.0
Backtrace
thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: DistinctSources(DistinctSources { begin: (Real("src/main.rs"), BytePos(0)), end: (Macros("::lazy_static::__lazy_static_internal"), BytePos(6703667)) })', src/librustc_errors/lib.rs:197:29
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:77
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:1052
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1426
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:204
9: std::panicking::default_hook
at src/libstd/panicking.rs:224
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:476
12: rust_begin_unwind
at src/libstd/panicking.rs:380
13: core::panicking::panic_fmt
at src/libcore/panicking.rs:85
14: core::option::expect_none_failed
at src/libcore/option.rs:1199
15: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &mut F>::call_once
16: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter
17: <rustc_errors::emitter::EmitterWriter as rustc_errors::emitter::Emitter>::emit_diagnostic
18: <rustc_errors::json::JsonEmitter as rustc_errors::emitter::Emitter>::emit_diagnostic
19: rustc_errors::HandlerInner::emit_diagnostic
20: rustc_errors::diagnostic_builder::DiagnosticBuilder::emit
21: rustc_resolve::lifetimes::LifetimeContext::resolve_elided_lifetimes
22: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_lifetime
23: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_ty
24: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_impl_item
25: rustc_hir::intravisit::walk_item
26: <rustc_resolve::lifetimes::LifetimeContext as rustc_hir::intravisit::Visitor>::visit_item
27: rustc_resolve::lifetimes::resolve_lifetimes
28: rustc::dep_graph::graph::DepGraph::with_task_impl
29: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::force_query
30: rustc::ty::query::plumbing::force_from_dep_node
31: rustc::dep_graph::graph::DepGraph::try_mark_previous_green
32: rustc::dep_graph::graph::DepGraph::try_mark_previous_green
33: rustc::dep_graph::graph::DepGraph::try_mark_green
34: rustc::dep_graph::graph::DepGraph::try_mark_green_and_read
35: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
36: <rustc_typeck::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
37: rustc::hir::map::Map::visit_item_likes_in_module
38: rustc_typeck::collect::collect_mod_item_types
39: rustc::ty::query::__query_compute::collect_mod_item_types
40: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::collect_mod_item_types>::compute
41: rustc::dep_graph::graph::DepGraph::with_task_impl
42: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
43: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::ensure_query
44: rustc_typeck::check_crate
45: rustc_interface::passes::analysis
46: rustc::ty::query::__query_compute::analysis
47: rustc::dep_graph::graph::DepGraph::with_task_impl
48: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
49: rustc::ty::context::tls::enter_global
50: rustc_interface::interface::run_compiler_in_existing_thread_pool
51: scoped_tls::ScopedKey<T>::set
52: syntax::with_globals
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Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Category: This is a bug.Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Relevant to the compiler team, which will review and decide on the PR/issue.Performance or correctness regression from stable to nightly.