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ICE: `Result::unwrap()` on an `Err` value: Sorts(ExpectedFound { ... } #124702

Closed matthiaskrgr closed 4 months ago

matthiaskrgr commented 4 months ago

auto-reduced (treereduce-rust):

trait X {}

trait Z {
    type Assoc: Y;
}
struct A<T>(T);

impl<T: X> Z for A<T> {
    type Assoc = T;
}

impl<T> From<<A<A<T>> as Z>::Assoc> for T {}

original:

#![feature(specialization)]
#![allow(incomplete_features)]

trait X {}
trait Y: X {}
trait Z {
    type Assoc: Y;
}
struct A<T>(T);

impl<T> Y for T where T: X {}
impl<T: X> Z for A<T> {
    type Assoc = T;
}

// this impl is invalid, but causes an ICE anyway
impl<T> From<<A<A<T>> as Z>::Assoc> for T {}
//~^ ERROR type parameter `T` must be used as the type parameter for some local type (e.g., `MyStruct<T>`)

fn main() {}

Version information

rustc 1.80.0-nightly (9fa862ff2 2024-05-04)
binary: rustc
commit-hash: 9fa862ff29ccfea885f8b1f33f4a507d456ae551
commit-date: 2024-05-04
host: x86_64-unknown-linux-gnu
release: 1.80.0-nightly
LLVM version: 18.1.4

Command: /home/matthias/.rustup/toolchains/master/bin/rustc -Znext-solver=coherence

Program output

``` error[E0405]: cannot find trait `Y` in this scope --> /tmp/icemaker_global_tempdir.3x50tymIDXeY/rustc_testrunner_tmpdir_reporting.LJEEw1d4XM4C/mvce.rs:4:17 | 1 | trait X {} | ------- similarly named trait `X` defined here ... 4 | type Assoc: Y; | ^ help: a trait with a similar name exists: `X` error[E0601]: `main` function not found in crate `mvce` --> /tmp/icemaker_global_tempdir.3x50tymIDXeY/rustc_testrunner_tmpdir_reporting.LJEEw1d4XM4C/mvce.rs:12:45 | 12 | impl From<> as Z>::Assoc> for T {} | ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.3x50tymIDXeY/rustc_testrunner_tmpdir_reporting.LJEEw1d4XM4C/mvce.rs` thread 'rustc' panicked at compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs:354:18: called `Result::unwrap()` on an `Err` value: Sorts(ExpectedFound { expected: Alias(Projection, AliasTy { args: [A>], def_id: DefId(0:5 ~ mvce[9f0c]::Z::Assoc) })>>], def_id: DefId(0:5 ~ mvce[9f0c]::Z::Assoc) }), found: A>], def_id: DefId(0:5 ~ mvce[9f0c]::Z::Assoc) })> }) stack backtrace: 0: 0x74a6c565aef5 - std::backtrace_rs::backtrace::libunwind::trace::hf338f796a90cfd6e at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5 1: 0x74a6c565aef5 - std::backtrace_rs::backtrace::trace_unsynchronized::h5d50ad2bb2b711c7 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x74a6c565aef5 - std::sys_common::backtrace::_print_fmt::hd839da3691208d62 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/sys_common/backtrace.rs:68:5 3: 0x74a6c565aef5 - ::fmt::h83d8fc7c529aa9c8 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/sys_common/backtrace.rs:44:22 4: 0x74a6c56aa12b - core::fmt::rt::Argument::fmt::hc89f952445ec87cd at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/core/src/fmt/rt.rs:165:63 5: 0x74a6c56aa12b - core::fmt::write::hab4ec40d2f94d282 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/core/src/fmt/mod.rs:1157:21 6: 0x74a6c564f97f - std::io::Write::write_fmt::h80ec83f1a70093e1 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/io/mod.rs:1832:15 7: 0x74a6c565acce - std::sys_common::backtrace::_print::h02236002ae38795d at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/sys_common/backtrace.rs:47:5 8: 0x74a6c565acce - std::sys_common::backtrace::print::hd0708e89b2c5879c at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/sys_common/backtrace.rs:34:9 9: 0x74a6c565d639 - std::panicking::default_hook::{{closure}}::hd0afacda5c8cf9de 10: 0x74a6c565d37d - std::panicking::default_hook::h5e6fb6e8ba09191a at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/panicking.rs:298:9 11: 0x74a6c20b6a2c - std[23e06557834ee477]::panicking::update_hook::>::{closure#0} 12: 0x74a6c565dd36 - as core::ops::function::Fn>::call::h17b339f4f9cbc47f at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/alloc/src/boxed.rs:2036:9 13: 0x74a6c565dd36 - std::panicking::rust_panic_with_hook::hcbe6cb1d0d4e1ee5 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/panicking.rs:799:13 14: 0x74a6c565dae4 - std::panicking::begin_panic_handler::{{closure}}::hc67a3006b30e8198 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/panicking.rs:664:13 15: 0x74a6c565b3b9 - std::sys_common::backtrace::__rust_end_short_backtrace::haf9fab6fbf5a2d3a at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/sys_common/backtrace.rs:171:18 16: 0x74a6c565d817 - rust_begin_unwind at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/panicking.rs:652:5 17: 0x74a6c56a66f3 - core::panicking::panic_fmt::h840d3ad0f99cdd30 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/core/src/panicking.rs:72:14 18: 0x74a6c56a6d36 - core::result::unwrap_failed::h55283fe3fc162273 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/core/src/result.rs:1654:5 19: 0x74a6c403a00a - ::unify_query_var_values 20: 0x74a6c402dbc3 - ::instantiate_nested_goals 21: 0x74a6c2bfed2e - ::visit_goal 22: 0x74a6c2bfedc3 - ::visit_goal 23: 0x74a6c3925b1a - rustc_trait_selection[a8abe391119244a1]::traits::coherence::overlap 24: 0x74a6c407660b - ::insert 25: 0x74a6c0a75778 - ::insert 26: 0x74a6c3484ebc - rustc_trait_selection[a8abe391119244a1]::traits::specialize::specialization_graph_provider 27: 0x74a6c3484a1f - rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::__rust_begin_short_backtrace::> 28: 0x74a6c3487417 - rustc_query_system[4b44ec3e43617094]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::QueryCtxt, false> 29: 0x74a6c3b8f8f4 - rustc_query_impl[c8a8c0bff8e01ad6]::query_impl::specialization_graph_of::get_query_non_incr::__rust_end_short_backtrace 30: 0x74a6c3ed3030 - rustc_hir_analysis[818e5c0bff74b8ba]::coherence::coherent_trait 31: 0x74a6c3ed2d23 - rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::__rust_begin_short_backtrace::> 32: 0x74a6c3948093 - rustc_query_system[4b44ec3e43617094]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::QueryCtxt, false> 33: 0x74a6c3946789 - rustc_query_impl[c8a8c0bff8e01ad6]::query_impl::coherent_trait::get_query_non_incr::__rust_end_short_backtrace 34: 0x74a6c3a2e8aa - rustc_hir_analysis[818e5c0bff74b8ba]::check::wfcheck::check_well_formed 35: 0x74a6c3a2c6ad - rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::__rust_begin_short_backtrace::> 36: 0x74a6c3a2be40 - rustc_query_system[4b44ec3e43617094]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::QueryCtxt, false> 37: 0x74a6c3a2bbbf - rustc_query_impl[c8a8c0bff8e01ad6]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace 38: 0x74a6c3a29b01 - rustc_hir_analysis[818e5c0bff74b8ba]::check::wfcheck::check_mod_type_wf 39: 0x74a6c3a29947 - rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::__rust_begin_short_backtrace::> 40: 0x74a6c3e47a30 - rustc_query_system[4b44ec3e43617094]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::QueryCtxt, false> 41: 0x74a6c3e477db - rustc_query_impl[c8a8c0bff8e01ad6]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace 42: 0x74a6c377eb1e - rustc_hir_analysis[818e5c0bff74b8ba]::check_crate 43: 0x74a6c37755c7 - rustc_interface[85d9b20ed3c7c603]::passes::analysis 44: 0x74a6c3775107 - rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::__rust_begin_short_backtrace::> 45: 0x74a6c41c05e5 - rustc_query_system[4b44ec3e43617094]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[c8a8c0bff8e01ad6]::plumbing::QueryCtxt, false> 46: 0x74a6c41c0349 - rustc_query_impl[c8a8c0bff8e01ad6]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 47: 0x74a6c400624e - rustc_interface[85d9b20ed3c7c603]::interface::run_compiler::, rustc_driver_impl[9a1cf205da409778]::run_compiler::{closure#0}>::{closure#1} 48: 0x74a6c3ff2849 - std[23e06557834ee477]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[9a1cf205da409778]::run_compiler::{closure#0}>::{closure#1}, core[29497e35239b89fd]::result::Result<(), rustc_span[ee88eaa59b68392e]::ErrorGuaranteed>>::{closure#0}, core[29497e35239b89fd]::result::Result<(), rustc_span[ee88eaa59b68392e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[29497e35239b89fd]::result::Result<(), rustc_span[ee88eaa59b68392e]::ErrorGuaranteed>> 49: 0x74a6c3ff25f6 - <::spawn_unchecked_, rustc_driver_impl[9a1cf205da409778]::run_compiler::{closure#0}>::{closure#1}, core[29497e35239b89fd]::result::Result<(), rustc_span[ee88eaa59b68392e]::ErrorGuaranteed>>::{closure#0}, core[29497e35239b89fd]::result::Result<(), rustc_span[ee88eaa59b68392e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[29497e35239b89fd]::result::Result<(), rustc_span[ee88eaa59b68392e]::ErrorGuaranteed>>::{closure#2} as core[29497e35239b89fd]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 50: 0x74a6c5667b8b - as core::ops::function::FnOnce>::call_once::hcdbd0506d988eb8c at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/alloc/src/boxed.rs:2022:9 51: 0x74a6c5667b8b - as core::ops::function::FnOnce>::call_once::h09f9075aff61f253 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/alloc/src/boxed.rs:2022:9 52: 0x74a6c5667b8b - std::sys::pal::unix::thread::Thread::new::thread_start::hd3f8986c115a8175 at /rustc/9fa862ff29ccfea885f8b1f33f4a507d456ae551/library/std/src/sys/pal/unix/thread.rs:108:17 53: 0x74a6beea955a - 54: 0x74a6bef26a3c - 55: 0x0 - 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: please make sure that you have updated to the latest nightly note: rustc 1.80.0-nightly (9fa862ff2 2024-05-04) 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 `core::convert::From` #1 [coherent_trait] coherence checking all impls of trait `core::convert::From` #2 [check_well_formed] checking that `` is well-formed #3 [check_mod_type_wf] checking that types are well-formed in top-level module #4 [analysis] running analysis passes on this crate end of query stack error: aborting due to 2 previous errors Some errors have detailed explanations: E0405, E0601. For more information about an error, try `rustc --explain E0405`. ```

@rustbot label +F-specialization

matthiaskrgr commented 4 months ago

This panics since https://github.com/rust-lang-ci/rust/commit/dbe6dbe6a5506aed89f27fa6c626e91f39217327 / https://github.com/rust-lang/rust/pull/124418 cc @compiler-errors