Closed
Description
Code
reduced from ./src/test/ui/parser/trait-object-trait-parens.rs
fn main() {
let _: Box<(?Sized)>;
}Meta
rustc --version --verbose:
binary: rustc
commit-hash: a74d1862d4d87a56244958416fd05976c58ca1a8
commit-date: 2020-05-14
host: x86_64-unknown-linux-gnu
release: 1.45.0-nightly
LLVM version: 9.0
Error output
error: `?Trait` is not permitted in trait object types
--> ./src/test/ui/parser/trait-object-trait-parens.rs:2:17
|
2 | let _: Box<(?Sized)>;
| ^^^^^^
warning: trait objects without an explicit `dyn` are deprecated
--> ./src/test/ui/parser/trait-object-trait-parens.rs:2:17
|
2 | let _: Box<(?Sized)>;
| ^^^^^^ help: use `dyn`: `dyn ?Sized`
|
= note: `#[warn(bare_trait_objects)]` on by default
error[E0224]: at least one trait is required for an object type
--> ./src/test/ui/parser/trait-object-trait-parens.rs:2:17
|
2 | let _: Box<(?Sized)>;
| ^^^^^^
thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', /rustc/a74d1862d4d87a56244958416fd05976c58ca1a8/src/librustc_hir/definitions.rs:356:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: internal compiler error: unexpected panic
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 (a74d1862d 2020-05-14) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z save-analysis
error: aborting due to 2 previous errors; 1 warning emitted
For more information about this error, try `rustc --explain E0224`.
Backtrace
error: `?Trait` is not permitted in trait object types
--> ./src/test/ui/parser/trait-object-trait-parens.rs:2:17
|
2 | let _: Box<(?Sized)>;
| ^^^^^^
warning: trait objects without an explicit `dyn` are deprecated
--> ./src/test/ui/parser/trait-object-trait-parens.rs:2:17
|
2 | let _: Box<(?Sized)>;
| ^^^^^^ help: use `dyn`: `dyn ?Sized`
|
= note: `#[warn(bare_trait_objects)]` on by default
error[E0224]: at least one trait is required for an object type
--> ./src/test/ui/parser/trait-object-trait-parens.rs:2:17
|
2 | let _: Box<(?Sized)>;
| ^^^^^^
thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', /rustc/a74d1862d4d87a56244958416fd05976c58ca1a8/src/librustc_hir/definitions.rs:356:9
stack backtrace:
0: 0x7f174f0912f4 - backtrace::backtrace::libunwind::trace::h98d3444f0ad70429
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
1: 0x7f174f0912f4 - backtrace::backtrace::trace_unsynchronized::h37f821d20053e6cd
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
2: 0x7f174f0912f4 - std::sys_common::backtrace::_print_fmt::hff04dc7e915a3c85
at src/libstd/sys_common/backtrace.rs:78
3: 0x7f174f0912f4 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h61891c439a79f00d
at src/libstd/sys_common/backtrace.rs:59
4: 0x7f174f0cf55c - core::fmt::write::hdf236390fbd68d3d
at src/libcore/fmt/mod.rs:1069
5: 0x7f174f083033 - std::io::Write::write_fmt::h55f7fe3633ce766f
at src/libstd/io/mod.rs:1537
6: 0x7f174f0964c5 - std::sys_common::backtrace::_print::h78339381acb79e1b
at src/libstd/sys_common/backtrace.rs:62
7: 0x7f174f0964c5 - std::sys_common::backtrace::print::h525aa9f9405c80a1
at src/libstd/sys_common/backtrace.rs:49
8: 0x7f174f0964c5 - std::panicking::default_hook::{{closure}}::hace90b8a218287e6
at src/libstd/panicking.rs:198
9: 0x7f174f096217 - std::panicking::default_hook::h160b6beccc49b335
at src/libstd/panicking.rs:218
10: 0x7f174f7a4b23 - rustc_driver::report_ice::h4f38da7fac8ebd4c
11: 0x7f174f096b7d - std::panicking::rust_panic_with_hook::h36f6804eea3f553a
at src/libstd/panicking.rs:481
12: 0x7f174f09675b - rust_begin_unwind
at src/libstd/panicking.rs:385
13: 0x7f174f0cc1f1 - core::panicking::panic_fmt::hd101a87121fa411f
at src/libcore/panicking.rs:89
14: 0x7f174f0cc13d - core::panicking::panic::h02171c407fa1462f
at src/libcore/panicking.rs:52
15: 0x7f174f860849 - rustc_save_analysis::SaveContext::get_path_res::hf83402573bfa98d7
16: 0x7f174f860972 - rustc_save_analysis::SaveContext::get_path_segment_data_with_id::h7d2b30ccbc41b299
17: 0x7f174f8ad643 - rustc_save_analysis::dump_visitor::DumpVisitor::process_path::hc6b3a41819957575
18: 0x7f174f8a52c3 - rustc_ast::visit::walk_ty::h812b0d7598d3c4b5
19: 0x7f174f8a425d - rustc_ast::visit::walk_generic_args::he71c8a049b8097d7
20: 0x7f174f8b80a1 - <rustc_save_analysis::dump_visitor::DumpVisitor as rustc_ast::visit::Visitor>::visit_ty::h1bbfc4963f70f0b3
21: 0x7f174f8a8005 - rustc_ast::visit::walk_stmt::h81cb9256713c304e
22: 0x7f174f8b603f - <rustc_save_analysis::dump_visitor::DumpVisitor as rustc_ast::visit::Visitor>::visit_item::h4354747b5f3d691f
23: 0x7f174f8b0a8a - <rustc_save_analysis::dump_visitor::DumpVisitor as rustc_ast::visit::Visitor>::visit_mod::h6c9a1e09b18401e7
24: 0x7f174f7ab553 - rustc_ast::visit::walk_crate::h56f8cc2e3898fa92
25: 0x7f174f77152d - rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps::h977635684f24d988
26: 0x7f174f771d2d - rustc_session::utils::<impl rustc_session::session::Session>::time::he49c63c8ce07be59
27: 0x7f174f7a6d18 - rustc_middle::ty::context::tls::enter_global::hdd230e538fe73592
28: 0x7f174f772b5f - rustc_interface::interface::run_compiler_in_existing_thread_pool::h38c97a796bc7c587
29: 0x7f174f7b20cd - scoped_tls::ScopedKey<T>::set::h4c152c8c034324a4
30: 0x7f174f7ab494 - rustc_ast::attr::with_globals::hff0725187a49e0cf
31: 0x7f174f7b39be - std::sys_common::backtrace::__rust_begin_short_backtrace::h9fbc8c3bd1d70936
32: 0x7f174f80dcbe - core::ops::function::FnOnce::call_once{{vtable.shim}}::h205b28cb8a6abd5a
33: 0x7f174f0a6a8a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::hb4fe39e1689c3de4
at /rustc/a74d1862d4d87a56244958416fd05976c58ca1a8/src/liballoc/boxed.rs:1034
34: 0x7f174f0a6a8a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::hae1de892063d9208
at /rustc/a74d1862d4d87a56244958416fd05976c58ca1a8/src/liballoc/boxed.rs:1034
35: 0x7f174f0a6a8a - std::sys::unix::thread::Thread::new::thread_start::h8b0ae441dc3343d4
at src/libstd/sys/unix/thread.rs:87
36: 0x7f174efba46f - start_thread
37: 0x7f174eeda3d3 - clone
38: 0x0 - <unknown>
error: internal compiler error: unexpected panic
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 (a74d1862d 2020-05-14) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z save-analysis
query stack during panic:
end of query stack
error: aborting due to 2 previous errors; 1 warning emitted
For more information about this error, try `rustc --explain E0224`.
This issue has been assigned to @doctorn via this comment.