Closed
Description
auto-reduced (treereduce-rust):
trait Foo {}
type Bar<T: Foo> = impl std::fmt::Debug;
trait Bop {}
impl Bop for Bar<usize> {}
type Barr = impl std::fmt::Debug;
impl Bop for Barr {}
original:
#![feature(type_alias_impl_trait)]
trait Foo {}
impl Foo for () {}
impl Foo for i32 {}
type Bar<T: Foo> = impl std::fmt::Debug;
fn defining_use<T: Foo>() -> Bar<T> {
42
}
trait Bop {}
impl Bop for Bar<()> {}
// If the hidden type is the same, this is effectively a second impl for the same type.
impl Bop for Bar<usize> {}
//~^ ERROR conflicting implementations
type Barr = impl std::fmt::Debug;
fn defining_use2() -> Barr {
42
}
// Even completely different opaque types must conflict.
impl Bop for Barr {}
//~^ ERROR conflicting implementations
// And obviously the hidden type must conflict, too.
impl Bop for i32 {}
//~^ ERROR conflicting implementations
fn main() {}Version information
rustc 1.78.0-nightly (6cc484351 2024-02-10)
binary: rustc
commit-hash: 6cc4843512d613f51ec81aba689180c31b0b28b6
commit-date: 2024-02-10
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 17.0.6
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Znext-solver=coherence
Program output
error[E0658]: `impl Trait` in type aliases is unstable
--> /tmp/icemaker_global_tempdir.RM2beP5WREmU/rustc_testrunner_tmpdir_reporting.WcwnBtogFJ2R/mvce.rs:3:20
|
3 | type Bar<T: Foo> = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
= help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
= note: this compiler was built on 2024-02-10; consider upgrading it if it is out of date
error[E0658]: `impl Trait` in type aliases is unstable
--> /tmp/icemaker_global_tempdir.RM2beP5WREmU/rustc_testrunner_tmpdir_reporting.WcwnBtogFJ2R/mvce.rs:9:13
|
9 | type Barr = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
= help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
= note: this compiler was built on 2024-02-10; consider upgrading it if it is out of date
error[E0601]: `main` function not found in crate `mvce`
--> /tmp/icemaker_global_tempdir.RM2beP5WREmU/rustc_testrunner_tmpdir_reporting.WcwnBtogFJ2R/mvce.rs:11:21
|
11 | impl Bop for Barr {}
| ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.RM2beP5WREmU/rustc_testrunner_tmpdir_reporting.WcwnBtogFJ2R/mvce.rs`
thread 'rustc' panicked at compiler/rustc_trait_selection/src/solve/assembly/mod.rs:615:17:
internal error: entered unreachable code: Weak and Inherent aliases should have been normalized away already
stack backtrace:
0: 0x7f6dd758b936 - std::backtrace_rs::backtrace::libunwind::trace::hce337a0fd0c5e1da
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
1: 0x7f6dd758b936 - std::backtrace_rs::backtrace::trace_unsynchronized::hbc9b4a5cec9b81eb
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f6dd758b936 - std::sys_common::backtrace::_print_fmt::habe453adcd959f3b
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:68:5
3: 0x7f6dd758b936 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h67bb2d10ecb8af10
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7f6dd75de380 - core::fmt::rt::Argument::fmt::hd5debad710e176b4
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/fmt/rt.rs:142:9
5: 0x7f6dd75de380 - core::fmt::write::h5987d5bee25e3bd6
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/fmt/mod.rs:1120:17
6: 0x7f6dd757f0ef - std::io::Write::write_fmt::h0876e0f4bddb923c
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/io/mod.rs:1854:15
7: 0x7f6dd758b714 - std::sys_common::backtrace::_print::h4ae69e83d64cbf46
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:47:5
8: 0x7f6dd758b714 - std::sys_common::backtrace::print::h1d97d5831d0262fb
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:34:9
9: 0x7f6dd758e4d7 - std::panicking::default_hook::{{closure}}::h39fabb1b3e65f47a
10: 0x7f6dd758e239 - std::panicking::default_hook::h416520d6bb2cb53f
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/panicking.rs:292:9
11: 0x7f6dda3266dc - std[3acc11fb688f3d76]::panicking::update_hook::<alloc[408654ec2a1215fa]::boxed::Box<rustc_driver_impl[a7481a600b2f11a0]::install_ice_hook::{closure#0}>>::{closure#0}
12: 0x7f6dd758ec26 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h2450ecbe2b1c1ea3
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/alloc/src/boxed.rs:2030:9
13: 0x7f6dd758ec26 - std::panicking::rust_panic_with_hook::h99ef5cbc4b3b0ae4
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/panicking.rs:785:13
14: 0x7f6dd758e939 - std::panicking::begin_panic_handler::{{closure}}::h2284f60633c08873
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/panicking.rs:651:13
15: 0x7f6dd758be36 - std::sys_common::backtrace::__rust_end_short_backtrace::h84bc49437da26b5c
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:171:18
16: 0x7f6dd758e6c4 - rust_begin_unwind
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/panicking.rs:647:5
17: 0x7f6dd75daa85 - core::panicking::panic_fmt::hfa0af2309df9012f
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/panicking.rs:72:14
18: 0x7f6ddadbf083 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::assemble_alias_bound_candidates_recur::<rustc_middle[9f94bb95ba4eb693]::ty::predicate::TraitPredicate>
19: 0x7f6ddae37b43 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::assemble_alias_bound_candidates::<rustc_middle[9f94bb95ba4eb693]::ty::predicate::TraitPredicate>
20: 0x7f6ddadbbf1f - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::assemble_and_evaluate_candidates::<rustc_middle[9f94bb95ba4eb693]::ty::predicate::TraitPredicate>
21: 0x7f6ddadd419d - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::search_graph::SearchGraph>::with_new_goal::<<rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>::{closure#3}
22: 0x7f6ddadd0832 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::search_graph::SearchGraph>::with_new_goal::<<rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>
23: 0x7f6ddadc4d06 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_goal
24: 0x7f6ddae3ab45 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::try_evaluate_added_goals
25: 0x7f6ddae37fd1 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_added_goals_and_make_canonical_response
26: 0x7f6ddadd31a8 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::search_graph::SearchGraph>::with_new_goal::<<rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>::{closure#3}
27: 0x7f6ddadd0832 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::search_graph::SearchGraph>::with_new_goal::<<rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>
28: 0x7f6ddadc4d06 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_goal
29: 0x7f6ddae3ab45 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::try_evaluate_added_goals
30: 0x7f6ddae37fd1 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_added_goals_and_make_canonical_response
31: 0x7f6ddadd5e54 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::search_graph::SearchGraph>::with_new_goal::<<rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>::{closure#3}
32: 0x7f6ddadd0832 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::search_graph::SearchGraph>::with_new_goal::<<rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>
33: 0x7f6ddadc4d06 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::EvalCtxt>::evaluate_goal
34: 0x7f6ddae3a11e - <rustc_infer[81d54d7e65d62577]::infer::InferCtxt as rustc_trait_selection[c406a89a2b7dc7ed]::solve::eval_ctxt::InferCtxtEvalExt>::evaluate_root_goal
35: 0x7f6ddadc6a52 - <rustc_trait_selection[c406a89a2b7dc7ed]::solve::fulfill::FulfillmentCtxt as rustc_infer[81d54d7e65d62577]::traits::engine::TraitEngine>::select_where_possible
36: 0x7f6dd86e7577 - <rustc_infer[81d54d7e65d62577]::infer::InferCtxt as rustc_trait_selection[c406a89a2b7dc7ed]::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation
37: 0x7f6ddba7bb01 - rustc_trait_selection[c406a89a2b7dc7ed]::traits::coherence::overlap
38: 0x7f6ddbb5995e - <rustc_middle[9f94bb95ba4eb693]::traits::specialization_graph::Children as rustc_trait_selection[c406a89a2b7dc7ed]::traits::specialize::specialization_graph::ChildrenExt>::insert
39: 0x7f6ddbb58878 - <rustc_middle[9f94bb95ba4eb693]::traits::specialization_graph::Graph as rustc_trait_selection[c406a89a2b7dc7ed]::traits::specialize::specialization_graph::GraphExt>::insert
40: 0x7f6ddc0e9dc9 - rustc_trait_selection[c406a89a2b7dc7ed]::traits::specialize::specialization_graph_provider
41: 0x7f6ddc0e96d9 - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::specialization_graph_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 8usize]>>
42: 0x7f6ddb6744e1 - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::DefIdCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
43: 0x7f6ddbebdebc - rustc_query_impl[60cfa4eef1128f6c]::query_impl::specialization_graph_of::get_query_non_incr::__rust_end_short_backtrace
44: 0x7f6ddbebdfbf - rustc_hir_analysis[1799a6ccb3095d3d]::coherence::coherent_trait
45: 0x7f6ddbebdee3 - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::coherent_trait::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 1usize]>>
46: 0x7f6ddbb128b4 - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::DefIdCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
47: 0x7f6ddbd05e4d - rustc_query_impl[60cfa4eef1128f6c]::query_impl::coherent_trait::get_query_non_incr::__rust_end_short_backtrace
48: 0x7f6ddb7cfd9a - rustc_hir_analysis[1799a6ccb3095d3d]::check_crate
49: 0x7f6ddbf8bd92 - rustc_interface[57a4cb1189ffa880]::passes::analysis
50: 0x7f6ddbf8b9df - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 1usize]>>
51: 0x7f6ddc324372 - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::SingleCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
52: 0x7f6ddc3240d5 - rustc_query_impl[60cfa4eef1128f6c]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
53: 0x7f6ddc33a582 - rustc_interface[57a4cb1189ffa880]::interface::run_compiler::<core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>, rustc_driver_impl[a7481a600b2f11a0]::run_compiler::{closure#0}>::{closure#0}
54: 0x7f6ddc3d2b46 - std[3acc11fb688f3d76]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[57a4cb1189ffa880]::util::run_in_thread_with_globals<rustc_interface[57a4cb1189ffa880]::util::run_in_thread_pool_with_globals<rustc_interface[57a4cb1189ffa880]::interface::run_compiler<core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>, rustc_driver_impl[a7481a600b2f11a0]::run_compiler::{closure#0}>::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>
55: 0x7f6ddc3d2973 - <<std[3acc11fb688f3d76]::thread::Builder>::spawn_unchecked_<rustc_interface[57a4cb1189ffa880]::util::run_in_thread_with_globals<rustc_interface[57a4cb1189ffa880]::util::run_in_thread_pool_with_globals<rustc_interface[57a4cb1189ffa880]::interface::run_compiler<core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>, rustc_driver_impl[a7481a600b2f11a0]::run_compiler::{closure#0}>::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#1} as core[8df037f8ced6ea1f]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
56: 0x7f6dd7597eb5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h61e4d902e063b23d
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/alloc/src/boxed.rs:2016:9
57: 0x7f6dd7597eb5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hfa3eaf4f75275f59
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/alloc/src/boxed.rs:2016:9
58: 0x7f6dd7597eb5 - std::sys::pal::unix::thread::Thread::new::thread_start::hb901d27f412b0ecd
at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys/pal/unix/thread.rs:108:17
59: 0x7f6dd73819eb - <unknown>
60: 0x7f6dd74057cc - <unknown>
61: 0x0 - <unknown>
error: the compiler unexpectedly panicked. this is a bug.
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 1.78.0-nightly (6cc484351 2024-02-10) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z next-solver=coherence -Z dump-mir-dir=dir
query stack during panic:
#0 [specialization_graph_of] building specialization graph of trait `Bop`
#1 [coherent_trait] coherence checking all impls of trait `Bop`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0601, E0658.
For more information about an error, try `rustc --explain E0601`.