ICE: Weak and Inherent aliases should have been normalized away already #120891
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to the crate attributes to enable = note: this compiler was built on 2024-02-10; consider upgrading it if it is out of date error[E0658]: `impl Trait` in type aliases is unstable --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to the crate attributes to enable = note: this compiler was built on 2024-02-10; consider upgrading it if it is out of date error[E0601]: `main` function not found in crate `mvce` --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`.