Closed
Description
cc tracking issue #107374
The code below compiles on nightly but errors with -Znext-solver:
pub trait Index {
type Output;
}
impl Index for () { type Output = (); }
pub trait IndexMut where Self: Index {
fn foo(&mut self);
}
impl IndexMut for <() as Index>::Output {
fn foo(&mut self) {}
}Error message:
error[E0271]: type mismatch resolving `<() as Index>::Output == &mut <() as Index>::Output`
--> <source>:12:12
|
12 | fn foo(&mut self) {}
| ^^^^^^^^^ types differ
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0271`.
Compiler returned: 1Backtrace
thread 'rustc' panicked at compiler/rustc_errors/src/lib.rs:1767:17:
aborting due to `-Z treat-err-as-bug=1`
stack backtrace:
0: 0x7fdd27b382b5 - std::backtrace_rs::backtrace::libunwind::trace::hfcb0e6e919fe8b02
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
1: 0x7fdd27b382b5 - std::backtrace_rs::backtrace::trace_unsynchronized::h2d7390b1768cc057
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7fdd27b382b5 - std::sys::backtrace::_print_fmt::h0a1fe72c74c3c92f
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/sys/backtrace.rs:68:5
3: 0x7fdd27b382b5 - <std::sys::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0efe09574522ab48
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/sys/backtrace.rs:44:22
4: 0x7fdd27b87d9b - core::fmt::rt::Argument::fmt::h86493f731d852471
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/core/src/fmt/rt.rs:173:76
5: 0x7fdd27b87d9b - core::fmt::write::hf027121cd79920f8
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/core/src/fmt/mod.rs:1174:21
6: 0x7fdd27b2ce9f - std::io::Write::write_fmt::h50f231aebdd6b44e
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/io/mod.rs:1835:15
7: 0x7fdd27b3808e - std::sys::backtrace::_print::ha583d08861e89abe
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/sys/backtrace.rs:47:5
8: 0x7fdd27b3808e - std::sys::backtrace::print::h326dfb2de669d6a9
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/sys/backtrace.rs:34:9
9: 0x7fdd27b3a9d9 - std::panicking::default_hook::{{closure}}::h338582459520bc95
10: 0x7fdd27b3a77c - std::panicking::default_hook::ha253d2f95ed1a278
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/panicking.rs:292:9
11: 0x7fdd243bbe7f - std[a9a046d33cddffde]::panicking::update_hook::<alloc[acf10b35c0018119]::boxed::Box<rustc_driver_impl[f6a9d0df02f1d1bf]::install_ice_hook::{closure#0}>>::{closure#0}
12: 0x7fdd27b3b2af - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h59cfa4ec21be1b23
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/alloc/src/boxed.rs:2078:9
13: 0x7fdd27b3b2af - std::panicking::rust_panic_with_hook::he6d3da0d6872d7e9
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/panicking.rs:804:13
14: 0x7fdd27b3aea3 - std::panicking::begin_panic_handler::{{closure}}::h562044d4931308b4
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/panicking.rs:663:13
15: 0x7fdd27b38779 - std::sys::backtrace::__rust_end_short_backtrace::h8d43a914ad44f7b8
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/sys/backtrace.rs:171:18
16: 0x7fdd27b3abb4 - rust_begin_unwind
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/panicking.rs:661:5
17: 0x7fdd27b84353 - core::panicking::panic_fmt::h72d84f0a9e5170e6
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/core/src/panicking.rs:74:14
18: 0x7fdd271d3096 - <rustc_errors[e779a9bbb6c56598]::DiagCtxtInner>::panic_if_treat_err_as_bug.cold
19: 0x7fdd263f6022 - <rustc_errors[e779a9bbb6c56598]::DiagCtxtInner>::emit_diagnostic::{closure#3}
20: 0x7fdd263e4246 - rustc_interface[2a6dcbe82196fb3f]::callbacks::track_diagnostic::<core[563965cbb8764b56]::option::Option<rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>>
21: 0x7fdd263e237f - <rustc_errors[e779a9bbb6c56598]::DiagCtxtInner>::emit_diagnostic
22: 0x7fdd263e2255 - <rustc_errors[e779a9bbb6c56598]::DiagCtxtHandle>::emit_diagnostic
23: 0x7fdd268f929c - <rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed as rustc_errors[e779a9bbb6c56598]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
24: 0x7fdd2509513d - <rustc_infer[3fbee8995ea8e832]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[5bf7e99b6c60346]::traits::error_reporting::type_err_ctxt_ext::InferCtxtPrivExt>::report_projection_error
25: 0x7fdd25094926 - <rustc_infer[3fbee8995ea8e832]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[5bf7e99b6c60346]::traits::error_reporting::type_err_ctxt_ext::InferCtxtPrivExt>::report_fulfillment_error
26: 0x7fdd2507f92e - <rustc_infer[3fbee8995ea8e832]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[5bf7e99b6c60346]::traits::error_reporting::type_err_ctxt_ext::TypeErrCtxtExt>::report_fulfillment_errors
27: 0x7fdd25e782a6 - rustc_hir_analysis[e4ed5cdf7069fdab]::check::wfcheck::check_associated_item
28: 0x7fdd23507eae - rustc_hir_analysis[e4ed5cdf7069fdab]::check::wfcheck::check_well_formed
29: 0x7fdd25bdfcbd - rustc_query_impl[bd968423f59ba745]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bd968423f59ba745]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[1a9a6fb822666db]::query::erase::Erased<[u8; 1usize]>>
30: 0x7fdd25bdff35 - rustc_query_system[411a21868c0145ef]::query::plumbing::try_execute_query::<rustc_query_impl[bd968423f59ba745]::DynamicConfig<rustc_query_system[411a21868c0145ef]::query::caches::VecCache<rustc_hir[4b11660a3be69043]::hir_id::OwnerId, rustc_middle[1a9a6fb822666db]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[bd968423f59ba745]::plumbing::QueryCtxt, false>
31: 0x7fdd25bdfc9a - rustc_query_impl[bd968423f59ba745]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
32: 0x7fdd25be0af4 - rustc_hir_analysis[e4ed5cdf7069fdab]::check::wfcheck::check_mod_type_wf
33: 0x7fdd25be0799 - rustc_query_impl[bd968423f59ba745]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bd968423f59ba745]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[1a9a6fb822666db]::query::erase::Erased<[u8; 1usize]>>
34: 0x7fdd2635eeb8 - rustc_query_system[411a21868c0145ef]::query::plumbing::try_execute_query::<rustc_query_impl[bd968423f59ba745]::DynamicConfig<rustc_query_system[411a21868c0145ef]::query::caches::DefaultCache<rustc_span[6197d43b7fdbf68b]::def_id::LocalModDefId, rustc_middle[1a9a6fb822666db]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[bd968423f59ba745]::plumbing::QueryCtxt, false>
35: 0x7fdd2635ec59 - rustc_query_impl[bd968423f59ba745]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
36: 0x7fdd25bf27a3 - rustc_hir_analysis[e4ed5cdf7069fdab]::check_crate
37: 0x7fdd260c7255 - rustc_interface[2a6dcbe82196fb3f]::passes::analysis
38: 0x7fdd260c6e15 - rustc_query_impl[bd968423f59ba745]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bd968423f59ba745]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[1a9a6fb822666db]::query::erase::Erased<[u8; 1usize]>>
39: 0x7fdd2665a1a5 - rustc_query_system[411a21868c0145ef]::query::plumbing::try_execute_query::<rustc_query_impl[bd968423f59ba745]::DynamicConfig<rustc_query_system[411a21868c0145ef]::query::caches::SingleCache<rustc_middle[1a9a6fb822666db]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[bd968423f59ba745]::plumbing::QueryCtxt, false>
40: 0x7fdd26659f0f - rustc_query_impl[bd968423f59ba745]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
41: 0x7fdd2656a9bf - rustc_interface[2a6dcbe82196fb3f]::interface::run_compiler::<core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>, rustc_driver_impl[f6a9d0df02f1d1bf]::run_compiler::{closure#0}>::{closure#1}
42: 0x7fdd263cfd89 - std[a9a046d33cddffde]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[2a6dcbe82196fb3f]::util::run_in_thread_with_globals<rustc_interface[2a6dcbe82196fb3f]::util::run_in_thread_pool_with_globals<rustc_interface[2a6dcbe82196fb3f]::interface::run_compiler<core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>, rustc_driver_impl[f6a9d0df02f1d1bf]::run_compiler::{closure#0}>::{closure#1}, core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>>::{closure#0}, core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>>
43: 0x7fdd263cfb3a - <<std[a9a046d33cddffde]::thread::Builder>::spawn_unchecked_<rustc_interface[2a6dcbe82196fb3f]::util::run_in_thread_with_globals<rustc_interface[2a6dcbe82196fb3f]::util::run_in_thread_pool_with_globals<rustc_interface[2a6dcbe82196fb3f]::interface::run_compiler<core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>, rustc_driver_impl[f6a9d0df02f1d1bf]::run_compiler::{closure#0}>::{closure#1}, core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>>::{closure#0}, core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[563965cbb8764b56]::result::Result<(), rustc_span[6197d43b7fdbf68b]::ErrorGuaranteed>>::{closure#2} as core[563965cbb8764b56]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
44: 0x7fdd27b4510b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7cabb6ffc85af816
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/alloc/src/boxed.rs:2064:9
45: 0x7fdd27b4510b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h074441c25350c542
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/alloc/src/boxed.rs:2064:9
46: 0x7fdd27b4510b - std::sys::pal::unix::thread::Thread::new::thread_start::h8b982c8d97422db7
at /rustc/e9e6e2e444c30c23a9c878a88fbc3978c2acad95/library/std/src/sys/pal/unix/thread.rs:108:17
47: 0x7fdd20c94ac3 - <unknown>
48: 0x7fdd20d26850 - <unknown>
49: 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: please make sure that you have updated to the latest nightly
note: please attach the file at `/app/rustc-ice-2024-06-30T07_05_54-1.txt` to your bug report
note: compiler flags: -C debuginfo=1 -C llvm-args=--x86-asm-syntax=intel --crate-type rlib -Z next-solver -Z treat-err-as-bug
query stack during panic:
#0 [check_well_formed] checking that `<impl at <source>:11:1: 11:40>::foo` is well-formed
#1 [check_mod_type_wf] checking that types are well-formed in top-level module
end of query stack
Compiler returned: 101