Closed
Description
auto-reduced (treereduce-rust):
trait B {
fn f(a: B) -> B;
}
fn main() {}
original:
#![allow(bare_trait_objects)]
trait A: Sized {
fn f(a: A) -> A;
//~^ ERROR associated item referring to unboxed trait object for its own trait
//~| ERROR the trait `A` cannot be made into an object
}
trait B {
fn f(a: B) -> B;
//~^ ERROR associated item referring to unboxed trait object for its own trait
//~| ERROR the trait `B` cannot be made into an object
}
trait C {
fn f(&self, a: C) -> C;
}
fn main() {}Version information
rustc 1.77.0-nightly (aa7e9f21e 2024-01-06)
binary: rustc
commit-hash: aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750
commit-date: 2024-01-06
host: x86_64-unknown-linux-gnu
release: 1.77.0-nightly
LLVM version: 17.0.6
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2021
Program output
error: internal compiler error: no errors encountered even though `span_delayed_bug` issued
error: internal compiler error[E0391]: cycle detected when computing function signature of `B::f`
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:2:5
|
2 | fn f(a: B) -> B;
| ^^^^^^^^^^^^^^^^
|
note: ...which requires checking if trait `B` is object safe...
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:1:1
|
1 | trait B {
| ^^^^^^^
note: ...which requires determining object safety of trait `B`...
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:1:1
|
1 | trait B {
| ^^^^^^^
= note: ...which again requires computing function signature of `B::f`, completing the cycle
note: cycle used when collecting item types in top-level module
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:1:1
|
1 | / trait B {
2 | | fn f(a: B) -> B;
3 | | }
4 | |
5 | | fn main() {}
| |____________^
= note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
note: delayed at compiler/rustc_query_system/src/query/job.rs:605:16
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic_without_consuming
1: <rustc_errors::DiagCtxt>::emit_diagnostic_without_consuming
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
3: rustc_query_system::query::plumbing::mk_cycle::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>
4: rustc_query_system::query::plumbing::cycle_error::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>
5: rustc_query_impl::query_impl::fn_sig::get_query_non_incr::__rust_end_short_backtrace
6: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 24]>>>
7: rustc_trait_selection::traits::object_safety::virtual_call_violations_for_method
8: rustc_trait_selection::traits::object_safety::object_safety_violations_for_assoc_item
9: <core::iter::adapters::flatten::FlatMap<core::iter::adapters::map::Map<core::iter::adapters::map::Map<core::slice::iter::Iter<(rustc_span::symbol::Symbol, rustc_middle::ty::assoc::AssocItem)>, <rustc_data_structures::sorted_map::index_map::SortedIndexMultiMap<u32, rustc_span::symbol::Symbol, rustc_middle::ty::assoc::AssocItem>>::iter::{closure#0}>, <rustc_middle::ty::assoc::AssocItems>::in_definition_order::{closure#0}>, alloc::vec::Vec<rustc_middle::traits::ObjectSafetyViolation>, rustc_trait_selection::traits::object_safety::object_safety_violations_for_trait::{closure#0}> as core::iter::traits::iterator::Iterator>::next
10: <core::iter::adapters::flatten::FlatMap<rustc_trait_selection::traits::util::SupertraitDefIds, alloc::vec::Vec<rustc_middle::traits::ObjectSafetyViolation>, rustc_trait_selection::traits::object_safety::object_safety_violations::{closure#0}> as core::iter::traits::iterator::Iterator>::next
11: rustc_trait_selection::traits::object_safety::object_safety_violations
12: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::object_safety_violations::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>>
13: <rustc_query_impl::query_impl::object_safety_violations::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::DefId)>>::call_once
14: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
15: rustc_query_impl::query_impl::object_safety_violations::get_query_non_incr::__rust_end_short_backtrace
16: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 16]>>>
17: rustc_trait_selection::traits::object_safety::check_is_object_safe
18: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_is_object_safe::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
19: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
20: rustc_query_impl::query_impl::check_is_object_safe::get_query_non_incr::__rust_end_short_backtrace
21: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 1]>>>
22: <dyn rustc_hir_analysis::astconv::AstConv>::maybe_lint_impl_trait
23: <dyn rustc_hir_analysis::astconv::AstConv>::ast_ty_to_ty_inner
24: <dyn rustc_hir_analysis::astconv::AstConv>::ty_of_fn
25: rustc_hir_analysis::collect::fn_sig
26: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::fn_sig::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 24]>>
27: <rustc_query_impl::query_impl::fn_sig::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::DefId)>>::call_once
28: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
29: rustc_query_impl::query_impl::fn_sig::get_query_non_incr::__rust_end_short_backtrace
30: <rustc_hir_analysis::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_trait_item
31: rustc_hir_analysis::collect::collect_mod_item_types
32: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::collect_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>
33: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalModDefId, rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
34: rustc_query_impl::query_impl::collect_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
35: rustc_hir_analysis::check_crate
36: rustc_interface::passes::analysis
37: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
38: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
39: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
40: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
41: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
42: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
43: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/alloc/src/boxed.rs:2016:9
44: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/alloc/src/boxed.rs:2016:9
45: std::sys::unix::thread::Thread::new::thread_start
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/std/src/sys/unix/thread.rs:108:17
46: <unknown>
47: <unknown>
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:2:5
|
2 | fn f(a: B) -> B;
| ^^^^^^^^^^^^^^^^
error: internal compiler error: `self.err_count()` changed but an error was not emitted
|
= note: delayed at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/compiler/rustc_session/src/session.rs:346:28
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic_without_consuming
1: <rustc_errors::DiagCtxt>::emit_diagnostic_without_consuming
2: <rustc_errors::DiagCtxt>::emit_diagnostic
3: <rustc_errors::DiagCtxt>::span_delayed_bug::<rustc_span::span_encoding::Span, &str>
4: rustc_hir_analysis::check_crate
5: rustc_interface::passes::analysis
6: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
7: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
8: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
9: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
10: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
11: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
12: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/alloc/src/boxed.rs:2016:9
13: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/alloc/src/boxed.rs:2016:9
14: std::sys::unix::thread::Thread::new::thread_start
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/std/src/sys/unix/thread.rs:108:17
15: <unknown>
16: <unknown>
error: internal compiler error[E0782]: trait objects must include the `dyn` keyword
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:2:13
|
2 | fn f(a: B) -> B;
| ^
|
= note: `B` it is not object safe, so it can't be `dyn`
note: delayed at compiler/rustc_hir_analysis/src/astconv/lint.rs:216:21
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic_without_consuming
1: <rustc_errors::DiagCtxtInner>::emit_diagnostic
2: <rustc_errors::DiagCtxtInner>::emit_stashed_diagnostics
3: <rustc_errors::DiagCtxt>::print_error_count
4: <rustc_session::session::Session>::finish_diagnostics
5: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
6: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
7: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
8: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/alloc/src/boxed.rs:2016:9
9: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/alloc/src/boxed.rs:2016:9
10: std::sys::unix::thread::Thread::new::thread_start
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/std/src/sys/unix/thread.rs:108:17
11: <unknown>
12: <unknown>
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:2:13
|
2 | fn f(a: B) -> B;
| ^
help: use a new generic type parameter, constrained by `B`
|
2 | fn f<T: B>(a: T) -> B;
| ++++++ ~
help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
|
2 | fn f(a: impl B) -> B;
| ++++
error: internal compiler error[E0782]: trait objects must include the `dyn` keyword
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:2:19
|
2 | fn f(a: B) -> B;
| ^
|
note: delayed at compiler/rustc_hir_analysis/src/astconv/lint.rs:216:21
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic_without_consuming
1: <rustc_errors::DiagCtxtInner>::emit_diagnostic
2: <rustc_errors::DiagCtxtInner>::emit_stashed_diagnostics
3: <rustc_errors::DiagCtxt>::print_error_count
4: <rustc_session::session::Session>::finish_diagnostics
5: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
6: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
7: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
8: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/alloc/src/boxed.rs:2016:9
9: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/alloc/src/boxed.rs:2016:9
10: std::sys::unix::thread::Thread::new::thread_start
at /rustc/aa7e9f21e9a058a4822b6cdc19ee88c80cdb3750/library/std/src/sys/unix/thread.rs:108:17
11: <unknown>
12: <unknown>
--> /tmp/icemaker_global_tempdir.OyUfQ7KVML5V/rustc_testrunner_tmpdir_reporting.vRfyT7raOx62/mvce.rs:2:19
|
2 | fn f(a: B) -> B;
| ^
help: `B` is not object safe, use `impl B` to return an opaque type, as long as you return a single underlying type
|
2 | fn f(a: B) -> impl B;
| ++++
note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: rustc 1.77.0-nightly (aa7e9f21e 2024-01-06) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z dump-mir-dir=dir
query stack during panic:
end of query stack
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