ICE: 'only `variances_of` returns `&[ty::Variance]`' #124423

matthiaskrgr · 2024-04-26T20:35:10Z

Code

use std::fmt::Debug;

fn elided(_: &impl Copy + 'a) -> _ { x }
fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
fn elided2( impl 'b) -> impl 'a + 'a { x }
fn explicit2<'a>(_: &'a impl Copy + 'a) -> impl Copy + 'a { x }
fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
fn elided4(_: &impl Copy + 'a) ->  new  { x(x) }
trait LifetimeTrait<'a> {}
impl<'a> LifetimeTrait<'a> for &'a Box<dyn 'a> {}

fn main() {}

Error output

`rustc -Zthreads=16?

error: ambiguous `+` in a type
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:3:15
  |
3 | fn elided(_: &impl Copy + 'a) -> _ { x }
  |               ^^^^^^^^^^^^^^ help: use parentheses to disambiguate: `(impl Copy + 'a)`

error: ambiguous `+` in a type
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:4:24
  |
4 | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
  |                        ^^^^^^^^^^^^^^ help: use parentheses to disambiguate: `(impl Copy + 'a)`

error: expected identifier, found keyword `impl`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:5:13
  |
5 | fn elided2( impl 'b) -> impl 'a + 'a { x }
  |             ^^^^ expected identifier, found keyword

error: expected one of `:` or `|`, found `'b`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:5:18
  |
5 | fn elided2( impl 'b) -> impl 'a + 'a { x }
  |                  ^^ expected one of `:` or `|`

error: ambiguous `+` in a type
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:6:25
  |
6 | fn explicit2<'a>(_: &'a impl Copy + 'a) -> impl Copy + 'a { x }
  |                         ^^^^^^^^^^^^^^ help: use parentheses to disambiguate: `(impl Copy + 'a)`

error: ambiguous `+` in a type
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:7:16
  |
7 | fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
  |                ^^^^^^^^^^^^^^ help: use parentheses to disambiguate: `(impl Copy + 'a)`

error: ambiguous `+` in a type
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:8:16
  |
8 | fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
  |                ^^^^^^^^^^^^^^ help: use parentheses to disambiguate: `(impl Copy + 'a)`

error: ambiguous `+` in a type
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:9:17
  |
9 | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
  |                 ^^^^^^^^^^^^^^ help: use parentheses to disambiguate: `(impl Copy + 'a)`

error: ambiguous `+` in a type
  --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:10:16
   |
10 | fn elided4(_: &impl Copy + 'a) ->  new  { x(x) }
   |                ^^^^^^^^^^^^^^ help: use parentheses to disambiguate: `(impl Copy + 'a)`

error: at least one trait must be specified
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:4:43
  |
4 | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
  |                                           ^^^^^^^

error: at least one trait must be specified
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:5:25
  |
5 | fn elided2( impl 'b) -> impl 'a + 'a { x }
  |                         ^^^^^^^^^^^^

error: at least one trait must be specified
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:7:35
  |
7 | fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
  |                                   ^^^^^^^^^^^^

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:3:27
  |
3 | fn elided(_: &impl Copy + 'a) -> _ { x }
  |          -                ^^ undeclared lifetime
  |          |
  |          help: consider introducing lifetime `'a` here: `<'a>`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:4:21
  |
4 | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
  |             -       ^^ undeclared lifetime
  |             |
  |             help: consider introducing lifetime `'a` here: `'a,`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:4:36
  |
4 | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
  |             -                      ^^ undeclared lifetime
  |             |
  |             help: consider introducing lifetime `'a` here: `'a,`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:4:48
  |
4 | fn explicit<'b>(_: &'a impl Copy + 'a) -> impl 'a { x }
  |             -                                  ^^ undeclared lifetime
  |             |
  |             help: consider introducing lifetime `'a` here: `'a,`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:5:30
  |
5 | fn elided2( impl 'b) -> impl 'a + 'a { x }
  |           -                  ^^ undeclared lifetime
  |           |
  |           help: consider introducing lifetime `'a` here: `<'a>`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:5:35
  |
5 | fn elided2( impl 'b) -> impl 'a + 'a { x }
  |           -                       ^^ undeclared lifetime
  |           |
  |           help: consider introducing lifetime `'a` here: `<'a>`

error[E0261]: use of undeclared lifetime name `'b`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:7:40
  |
7 | fn foo<'a>(_: &impl Copy + 'a) -> impl 'b + 'a { x }
  |        -                               ^^ undeclared lifetime
  |        |
  |        help: consider introducing lifetime `'b` here: `'b,`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:8:28
  |
8 | fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
  |           -                ^^ undeclared lifetime
  |           |
  |           help: consider introducing lifetime `'a` here: `<'a>`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:8:43
  |
8 | fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
  |           -                               ^^ undeclared lifetime
  |           |
  |           help: consider introducing lifetime `'a` here: `<'a>`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:9:14
  |
9 | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
  |      -       ^^ undeclared lifetime
  |      |
  |      help: consider introducing lifetime `'a` here: `'a,`

error[E0261]: use of undeclared lifetime name `'a`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:9:29
  |
9 | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
  |      -                      ^^ undeclared lifetime
  |      |
  |      help: consider introducing lifetime `'a` here: `'a,`

error[E0261]: use of undeclared lifetime name `'a`
  --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:10:28
   |
10 | fn elided4(_: &impl Copy + 'a) ->  new  { x(x) }
   |           -                ^^ undeclared lifetime
   |           |
   |           help: consider introducing lifetime `'a` here: `<'a>`

error[E0412]: cannot find type `new` in this scope
  --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:10:36
   |
10 | fn elided4(_: &impl Copy + 'a) ->  new  { x(x) }
   |                                    ^^^ not found in this scope

warning: unused import: `std::fmt::Debug`
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:1:5
  |
1 | use std::fmt::Debug;
  |     ^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0224]: at least one trait is required for an object type
  --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:14:40
   |
14 | impl<'a> LifetimeTrait<'a> for &'a Box<dyn 'a> {}
   |                                        ^^^^^^

error[E0224]: at least one trait is required for an object type
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:9:40
  |
9 | fn x<'b>(_: &'a impl Copy + 'a) -> Box<dyn 'b> { Box::u32(x) }
  |                                        ^^^^^^

error[E0224]: at least one trait is required for an object type
 --> 640f7256ec72797afbb92e944ae80a31ef0cc938.rs:8:39
  |
8 | fn elided3(_: &impl Copy + 'a) -> Box<dyn 'a> { Box::new(x) }
  |                                       ^^^^^^

Backtrace

error: internal compiler error: compiler/rustc_middle/src/values.rs:147:13: only `variances_of` returns `&[ty::Variance]`

thread 'rustc' panicked at compiler/rustc_middle/src/values.rs:147:13:
Box<dyn Any>
stack backtrace:
   0:     0x720ba73e2015 - std::backtrace_rs::backtrace::libunwind::trace::hf25202e2e00af7fe
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x720ba73e2015 - std::backtrace_rs::backtrace::trace_unsynchronized::hf438bcb2ecba1ba0
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x720ba73e2015 - std::sys_common::backtrace::_print_fmt::haa6838e2497fc7b9
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x720ba73e2015 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he4e508a9a6a9379b
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x720ba743127b - core::fmt::rt::Argument::fmt::hfc565fcb4aff2b68
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/core/src/fmt/rt.rs:165:63
   5:     0x720ba743127b - core::fmt::write::h8615e21a192acba6
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/core/src/fmt/mod.rs:1157:21
   6:     0x720ba73d6c3f - std::io::Write::write_fmt::h9bd05ef323d042aa
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/io/mod.rs:1832:15
   7:     0x720ba73e1dee - std::sys_common::backtrace::_print::hb902e2c471d92c3b
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x720ba73e1dee - std::sys_common::backtrace::print::h216544c8f5319a16
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x720ba73e4759 - std::panicking::default_hook::{{closure}}::h5074792a3bd60472
  10:     0x720ba73e449d - std::panicking::default_hook::h0214c83605124733
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/panicking.rs:298:9
  11:     0x720ba3c32d0c - std[afdd12a1173e2e7c]::panicking::update_hook::<alloc[922c347629d7e4f4]::boxed::Box<rustc_driver_impl[3339b4788993c99a]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x720ba73e4e56 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h85277f00f750df2b
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/alloc/src/boxed.rs:2036:9
  13:     0x720ba73e4e56 - std::panicking::rust_panic_with_hook::hf7e104e22c072107
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/panicking.rs:799:13
  14:     0x720ba3c62654 - std[afdd12a1173e2e7c]::panicking::begin_panic::<rustc_errors[fe7873ef7f0a57]::ExplicitBug>::{closure#0}
  15:     0x720ba3c5f006 - std[afdd12a1173e2e7c]::sys_common::backtrace::__rust_end_short_backtrace::<std[afdd12a1173e2e7c]::panicking::begin_panic<rustc_errors[fe7873ef7f0a57]::ExplicitBug>::{closure#0}, !>
  16:     0x720ba3c5a606 - std[afdd12a1173e2e7c]::panicking::begin_panic::<rustc_errors[fe7873ef7f0a57]::ExplicitBug>
  17:     0x720ba3c6b831 - <rustc_errors[fe7873ef7f0a57]::diagnostic::BugAbort as rustc_errors[fe7873ef7f0a57]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x720ba407f6b8 - <rustc_errors[fe7873ef7f0a57]::DiagCtxt>::span_bug::<rustc_span[93d2091650143ca2]::span_encoding::Span, alloc[922c347629d7e4f4]::string::String>
  19:     0x720ba412120d - rustc_middle[fac044f75267a5d2]::util::bug::opt_span_bug_fmt::<rustc_span[93d2091650143ca2]::span_encoding::Span>::{closure#0}
  20:     0x720ba4107a8a - rustc_middle[fac044f75267a5d2]::ty::context::tls::with_opt::<rustc_middle[fac044f75267a5d2]::util::bug::opt_span_bug_fmt<rustc_span[93d2091650143ca2]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x720ba410790b - rustc_middle[fac044f75267a5d2]::ty::context::tls::with_context_opt::<rustc_middle[fac044f75267a5d2]::ty::context::tls::with_opt<rustc_middle[fac044f75267a5d2]::util::bug::opt_span_bug_fmt<rustc_span[93d2091650143ca2]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x720ba2950717 - rustc_middle[fac044f75267a5d2]::util::bug::span_bug_fmt::<rustc_span[93d2091650143ca2]::span_encoding::Span>
  23:     0x720ba4122cdc - <&[rustc_type_ir[f53998895534aa17]::Variance] as rustc_query_system[9c4a1f9ef0a7cd62]::values::Value<rustc_middle[fac044f75267a5d2]::ty::context::TyCtxt>>::from_cycle_error
  24:     0x720ba4479240 - <rustc_query_impl[2aac348f2d18b4c6]::query_impl::variances_of::dynamic_query::{closure#3} as core[b57b4d11596df046]::ops::function::FnOnce<(rustc_middle[fac044f75267a5d2]::ty::context::TyCtxt, &rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::CycleError, rustc_span[93d2091650143ca2]::ErrorGuaranteed)>>::call_once
  25:     0x720ba440d586 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::mk_cycle::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt>
  26:     0x720ba57d4e01 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  27:     0x720ba57d4121 - rustc_query_impl[2aac348f2d18b4c6]::query_impl::variances_of::get_query_non_incr::__rust_end_short_backtrace
  28:     0x720ba5b12229 - rustc_middle[fac044f75267a5d2]::query::plumbing::query_get_at::<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 16usize]>>>
  29:     0x720ba505a762 - rustc_middle[fac044f75267a5d2]::ty::relate::structurally_relate_tys::<rustc_infer[e7916b8eaa10188e]::infer::relate::generalize::Generalizer>::{closure#0}
  30:     0x720ba50543a3 - <rustc_infer[e7916b8eaa10188e]::infer::relate::generalize::Generalizer as rustc_middle[fac044f75267a5d2]::ty::relate::TypeRelation>::tys::{closure#0}
  31:     0x720ba5048148 - <rustc_infer[e7916b8eaa10188e]::infer::relate::type_relating::TypeRelating as rustc_middle[fac044f75267a5d2]::ty::relate::TypeRelation>::tys
  32:     0x720ba5b0e1d0 - <rustc_hir_typeck[52c35745c0d9c41b]::coercion::Coerce>::unify_and::<rustc_hir_typeck[52c35745c0d9c41b]::coercion::identity>
  33:     0x720ba5b1e351 - <rustc_hir_typeck[52c35745c0d9c41b]::fn_ctxt::FnCtxt>::coerce
  34:     0x720ba5b2c18f - <rustc_hir_typeck[52c35745c0d9c41b]::fn_ctxt::FnCtxt>::check_block_with_expected
  35:     0x720ba5b35342 - <rustc_hir_typeck[52c35745c0d9c41b]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  36:     0x720ba5377f1c - rustc_hir_typeck[52c35745c0d9c41b]::check::check_fn
  37:     0x720ba536d5ed - rustc_hir_typeck[52c35745c0d9c41b]::typeck
  38:     0x720ba536cfd1 - rustc_query_impl[2aac348f2d18b4c6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2aac348f2d18b4c6]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>
  39:     0x720ba541dcb1 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::VecCache<rustc_span[93d2091650143ca2]::def_id::LocalDefId, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  40:     0x720ba541c9d6 - rustc_query_impl[2aac348f2d18b4c6]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  41:     0x720ba59b0f2f - rustc_middle[fac044f75267a5d2]::query::plumbing::query_get_at::<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::VecCache<rustc_span[93d2091650143ca2]::def_id::LocalDefId, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>>
  42:     0x720ba569cfef - rustc_hir_analysis[a60cccb823c49a1]::collect::infer_return_ty_for_fn_sig
  43:     0x720ba59b180f - rustc_hir_analysis[a60cccb823c49a1]::collect::fn_sig
  44:     0x720ba520c1bf - rustc_query_impl[2aac348f2d18b4c6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2aac348f2d18b4c6]::query_impl::fn_sig::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 24usize]>>
  45:     0x720ba520c18f - <rustc_query_impl[2aac348f2d18b4c6]::query_impl::fn_sig::dynamic_query::{closure#2} as core[b57b4d11596df046]::ops::function::FnOnce<(rustc_middle[fac044f75267a5d2]::ty::context::TyCtxt, rustc_span[93d2091650143ca2]::def_id::DefId)>>::call_once
  46:     0x720ba520e1ac - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  47:     0x720ba520dbe3 - rustc_query_impl[2aac348f2d18b4c6]::query_impl::fn_sig::get_query_non_incr::__rust_end_short_backtrace
  48:     0x720ba56bde90 - rustc_middle[fac044f75267a5d2]::query::plumbing::query_get_at::<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 24usize]>>>
  49:     0x720ba57d857b - <rustc_hir_analysis[a60cccb823c49a1]::variance::constraints::ConstraintContext>::build_constraints_for_item
  50:     0x720ba2b73276 - rustc_hir_analysis[a60cccb823c49a1]::variance::crate_variances
  51:     0x720ba5dd4f22 - rustc_query_impl[2aac348f2d18b4c6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2aac348f2d18b4c6]::query_impl::crate_variances::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>
  52:     0x720ba5dd42b4 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::SingleCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  53:     0x720ba5dd3860 - rustc_query_impl[2aac348f2d18b4c6]::query_impl::crate_variances::get_query_non_incr::__rust_end_short_backtrace
  54:     0x720ba57d6587 - rustc_hir_analysis[a60cccb823c49a1]::variance::variances_of
  55:     0x720ba57d61e4 - rustc_query_impl[2aac348f2d18b4c6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2aac348f2d18b4c6]::query_impl::variances_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 16usize]>>
  56:     0x720ba57d61c9 - <rustc_query_impl[2aac348f2d18b4c6]::query_impl::variances_of::dynamic_query::{closure#2} as core[b57b4d11596df046]::ops::function::FnOnce<(rustc_middle[fac044f75267a5d2]::ty::context::TyCtxt, rustc_span[93d2091650143ca2]::def_id::DefId)>>::call_once
  57:     0x720ba57d4598 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  58:     0x720ba57d4121 - rustc_query_impl[2aac348f2d18b4c6]::query_impl::variances_of::get_query_non_incr::__rust_end_short_backtrace
  59:     0x720ba5b12229 - rustc_middle[fac044f75267a5d2]::query::plumbing::query_get_at::<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 16usize]>>>
  60:     0x720ba505a762 - rustc_middle[fac044f75267a5d2]::ty::relate::structurally_relate_tys::<rustc_infer[e7916b8eaa10188e]::infer::relate::generalize::Generalizer>::{closure#0}
  61:     0x720ba50543a3 - <rustc_infer[e7916b8eaa10188e]::infer::relate::generalize::Generalizer as rustc_middle[fac044f75267a5d2]::ty::relate::TypeRelation>::tys::{closure#0}
  62:     0x720ba5048148 - <rustc_infer[e7916b8eaa10188e]::infer::relate::type_relating::TypeRelating as rustc_middle[fac044f75267a5d2]::ty::relate::TypeRelation>::tys
  63:     0x720ba5b0e1d0 - <rustc_hir_typeck[52c35745c0d9c41b]::coercion::Coerce>::unify_and::<rustc_hir_typeck[52c35745c0d9c41b]::coercion::identity>
  64:     0x720ba5b1e351 - <rustc_hir_typeck[52c35745c0d9c41b]::fn_ctxt::FnCtxt>::coerce
  65:     0x720ba5b2c18f - <rustc_hir_typeck[52c35745c0d9c41b]::fn_ctxt::FnCtxt>::check_block_with_expected
  66:     0x720ba5b35342 - <rustc_hir_typeck[52c35745c0d9c41b]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  67:     0x720ba5377f1c - rustc_hir_typeck[52c35745c0d9c41b]::check::check_fn
  68:     0x720ba536d5ed - rustc_hir_typeck[52c35745c0d9c41b]::typeck
  69:     0x720ba536cfd1 - rustc_query_impl[2aac348f2d18b4c6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2aac348f2d18b4c6]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>
  70:     0x720ba541dcb1 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::VecCache<rustc_span[93d2091650143ca2]::def_id::LocalDefId, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  71:     0x720ba541c9d6 - rustc_query_impl[2aac348f2d18b4c6]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  72:     0x720ba59b0f2f - rustc_middle[fac044f75267a5d2]::query::plumbing::query_get_at::<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::VecCache<rustc_span[93d2091650143ca2]::def_id::LocalDefId, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>>
  73:     0x720ba5d84f18 - rustc_hir_analysis[a60cccb823c49a1]::collect::type_of::type_of_opaque
  74:     0x720ba5d84e6b - rustc_query_impl[2aac348f2d18b4c6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2aac348f2d18b4c6]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>
  75:     0x720ba50a3c17 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  76:     0x720ba601625e - rustc_query_impl[2aac348f2d18b4c6]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
  77:     0x720ba56bd454 - rustc_middle[fac044f75267a5d2]::query::plumbing::query_get_at::<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>>
  78:     0x720ba2caf318 - rustc_hir_analysis[a60cccb823c49a1]::collect::type_of::type_of
  79:     0x720ba50a5022 - rustc_query_impl[2aac348f2d18b4c6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2aac348f2d18b4c6]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>
  80:     0x720ba50a3c17 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  81:     0x720ba50a371b - rustc_query_impl[2aac348f2d18b4c6]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  82:     0x720ba56bd454 - rustc_middle[fac044f75267a5d2]::query::plumbing::query_get_at::<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::DefIdCache<rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 8usize]>>>
  83:     0x720ba5f8a7ab - rustc_hir_analysis[a60cccb823c49a1]::check::check::check_item_type
  84:     0x720ba56af89b - rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_well_formed
  85:     0x720ba56ae36d - rustc_query_impl[2aac348f2d18b4c6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2aac348f2d18b4c6]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 1usize]>>
  86:     0x720ba56adb00 - rustc_query_system[9c4a1f9ef0a7cd62]::query::plumbing::try_execute_query::<rustc_query_impl[2aac348f2d18b4c6]::DynamicConfig<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::VecCache<rustc_hir[53aa510b1c4945fe]::hir_id::OwnerId, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2aac348f2d18b4c6]::plumbing::QueryCtxt, false>
  87:     0x720ba56ad87f - rustc_query_impl[2aac348f2d18b4c6]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  88:     0x720ba56ad7cf - rustc_middle[fac044f75267a5d2]::query::plumbing::query_ensure_error_guaranteed::<rustc_query_system[9c4a1f9ef0a7cd62]::query::caches::VecCache<rustc_hir[53aa510b1c4945fe]::hir_id::OwnerId, rustc_middle[fac044f75267a5d2]::query::erase::Erased<[u8; 1usize]>>, ()>
  89:     0x720ba3d0487f - rayon[753075a1b654ae7c]::iter::plumbing::bridge_producer_consumer::helper::<rayon[753075a1b654ae7c]::slice::IterProducer<rustc_hir[53aa510b1c4945fe]::hir::ItemId>, rayon[753075a1b654ae7c]::iter::filter_map::FilterMapConsumer<rayon[753075a1b654ae7c]::iter::reduce::ReduceConsumer<<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::and<()>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
  90:     0x720ba3d312e3 - <rayon_core[cf8f8c64e3806182]::job::StackJob<rayon_core[cf8f8c64e3806182]::latch::SpinLatch, rayon_core[cf8f8c64e3806182]::join::join_context::call_b<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>, rayon[753075a1b654ae7c]::iter::plumbing::bridge_producer_consumer::helper<rayon[753075a1b654ae7c]::slice::IterProducer<rustc_hir[53aa510b1c4945fe]::hir::ItemId>, rayon[753075a1b654ae7c]::iter::filter_map::FilterMapConsumer<rayon[753075a1b654ae7c]::iter::reduce::ReduceConsumer<<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::and<()>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#1}>::{closure#0}, core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>> as rayon_core[cf8f8c64e3806182]::job::Job>::execute
  91:     0x720ba38156a9 - <rayon_core[cf8f8c64e3806182]::registry::WorkerThread>::wait_until_cold
  92:     0x720ba3d1d40d - rayon_core[cf8f8c64e3806182]::join::join_context::<rayon[753075a1b654ae7c]::iter::plumbing::bridge_producer_consumer::helper<rayon[753075a1b654ae7c]::slice::IterProducer<rustc_hir[53aa510b1c4945fe]::hir::ItemId>, rayon[753075a1b654ae7c]::iter::filter_map::FilterMapConsumer<rayon[753075a1b654ae7c]::iter::reduce::ReduceConsumer<<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::and<()>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#0}, rayon[753075a1b654ae7c]::iter::plumbing::bridge_producer_consumer::helper<rayon[753075a1b654ae7c]::slice::IterProducer<rustc_hir[53aa510b1c4945fe]::hir::ItemId>, rayon[753075a1b654ae7c]::iter::filter_map::FilterMapConsumer<rayon[753075a1b654ae7c]::iter::reduce::ReduceConsumer<<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::and<()>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#1}, core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>, core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::{closure#0}
  93:     0x720ba3d04a93 - rayon[753075a1b654ae7c]::iter::plumbing::bridge_producer_consumer::helper::<rayon[753075a1b654ae7c]::slice::IterProducer<rustc_hir[53aa510b1c4945fe]::hir::ItemId>, rayon[753075a1b654ae7c]::iter::filter_map::FilterMapConsumer<rayon[753075a1b654ae7c]::iter::reduce::ReduceConsumer<<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::and<()>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
  94:     0x720ba3d312e3 - <rayon_core[cf8f8c64e3806182]::job::StackJob<rayon_core[cf8f8c64e3806182]::latch::SpinLatch, rayon_core[cf8f8c64e3806182]::join::join_context::call_b<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>, rayon[753075a1b654ae7c]::iter::plumbing::bridge_producer_consumer::helper<rayon[753075a1b654ae7c]::slice::IterProducer<rustc_hir[53aa510b1c4945fe]::hir::ItemId>, rayon[753075a1b654ae7c]::iter::filter_map::FilterMapConsumer<rayon[753075a1b654ae7c]::iter::reduce::ReduceConsumer<<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::and<()>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#1}>, rustc_data_structures[d6fa27de0aa046ab]::sync::parallel::enabled::try_par_for_each_in<&[rustc_hir[53aa510b1c4945fe]::hir::ItemId], rustc_span[93d2091650143ca2]::ErrorGuaranteed, <rustc_middle[fac044f75267a5d2]::hir::ModuleItems>::par_items<rustc_hir_analysis[a60cccb823c49a1]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>::{closure#1}>::{closure#0}, core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>> as rayon_core[cf8f8c64e3806182]::job::Job>::execute
  95:     0x720ba38156a9 - <rayon_core[cf8f8c64e3806182]::registry::WorkerThread>::wait_until_cold
  96:     0x720ba38125e9 - <rayon_core[cf8f8c64e3806182]::registry::ThreadBuilder>::run
  97:     0x720ba3c350f7 - <<crossbeam_utils[e5e25af5fb81fd01]::thread::ScopedThreadBuilder>::spawn<<rayon_core[cf8f8c64e3806182]::ThreadPoolBuilder>::build_scoped<rustc_interface[5229a2b0633dffa3]::util::run_in_thread_pool_with_globals<rustc_interface[5229a2b0633dffa3]::interface::run_compiler<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>, rustc_driver_impl[3339b4788993c99a]::run_compiler::{closure#0}>::{closure#1}, core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#0}, rustc_interface[5229a2b0633dffa3]::util::run_in_thread_pool_with_globals<rustc_interface[5229a2b0633dffa3]::interface::run_compiler<core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>, rustc_driver_impl[3339b4788993c99a]::run_compiler::{closure#0}>::{closure#1}, core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::{closure#3}::{closure#0}::{closure#1}, core[b57b4d11596df046]::result::Result<(), rustc_span[93d2091650143ca2]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#0} as core[b57b4d11596df046]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  98:     0x720ba3c296ce - std[afdd12a1173e2e7c]::sys_common::backtrace::__rust_begin_short_backtrace::<alloc[922c347629d7e4f4]::boxed::Box<dyn core[b57b4d11596df046]::ops::function::FnOnce<(), Output = ()> + core[b57b4d11596df046]::marker::Send>, ()>
  99:     0x720ba3c34da5 - <<std[afdd12a1173e2e7c]::thread::Builder>::spawn_unchecked_<alloc[922c347629d7e4f4]::boxed::Box<dyn core[b57b4d11596df046]::ops::function::FnOnce<(), Output = ()> + core[b57b4d11596df046]::marker::Send>, ()>::{closure#2} as core[b57b4d11596df046]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
 100:     0x720ba73eec8b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4dac72dce20215ab
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/alloc/src/boxed.rs:2022:9
 101:     0x720ba73eec8b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h375d8e0aef16bda1
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/alloc/src/boxed.rs:2022:9
 102:     0x720ba73eec8b - std::sys::pal::unix::thread::Thread::new::thread_start::h5cf43122e165be8d
                               at /rustc/4d570eea025a19564429eb52b34ec34e14659f55/library/std/src/sys/pal/unix/thread.rs:108:17
 103:     0x720ba718d55a - <unknown>
 104:     0x720ba720aa3c - <unknown>
 105:                0x0 - <unknown>

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 `/tmp/im/rustc-ice-2024-04-26T20_33_12-1888606.txt` to your bug report

note: compiler flags: -Z threads=16

query stack during panic:
#0 [typeck] type-checking `elided`
#1 [fn_sig] computing function signature of `elided`
#2 [crate_variances] computing the variances for items in this crate
#3 [variances_of] computing the variances of `x`
#4 [typeck] type-checking `explicit`
#5 [type_of_opaque] computing type of opaque `explicit::{opaque#0}`
#6 [type_of] computing type of `explicit::{opaque#0}`
#7 [check_well_formed] checking that `explicit::{opaque#0}` is well-formed
#8 [check_mod_type_wf] checking that types are well-formed in top-level module
#9 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 29 previous errors; 1 warning emitted

Some errors have detailed explanations: E0224, E0261, E0412.
For more information about an error, try `rustc --explain E0224`.

The text was updated successfully, but these errors were encountered:

ranger-ross · 2025-01-12T02:36:46Z

I re-tested this with 1.86.0-nightly 2025-01-05 and it now deadlocks instead of the previously reported error

Backtrace

thread 'rustc query cycle handler' panicked at compiler/rustc_query_system/src/query/job.rs:504:9:
deadlock detected as we're unable to find a query cycle to break
current query map:
{}
stack backtrace:
   0:     0x7f424d6d28ca - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h6b42c5146e72e2f0
   1:     0x7f424de135e6 - core::fmt::write::hbd4a43c25842b30e
   2:     0x7f424ecbf7d1 - std::io::Write::write_fmt::h23940da43f962a37
   3:     0x7f424d6d2722 - std::sys::backtrace::BacktraceLock::print::h1e5814cd5ec9c2fb
   4:     0x7f424d6d4cc7 - std::panicking::default_hook::{{closure}}::hdf151d20758abfa9
   5:     0x7f424d6d4ab0 - std::panicking::default_hook::hede38d49da63739d
   6:     0x7f424c851298 - std[c489bf36f52f5dc2]::panicking::update_hook::<alloc[334122f5810a4f6a]::boxed::Box<rustc_driver_impl[95c3c1d9dfa1b237]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7f424d6d5553 - std::panicking::rust_panic_with_hook::h7ed4182c54fcf537
   8:     0x7f424d6d524a - std::panicking::begin_panic_handler::{{closure}}::h043ee0881ea76aa9
   9:     0x7f424d6d2d99 - std::sys::backtrace::__rust_end_short_backtrace::h00b364a371e4fc36
  10:     0x7f424d6d4f0d - rust_begin_unwind
  11:     0x7f424a39df10 - core::panicking::panic_fmt::h4d448f50970c8dfa
  12:     0x7f424d27e9fa - rustc_query_system[7ea814a5da168eec]::query::job::break_query_cycles
  13:     0x7f424c847b4c - std[c489bf36f52f5dc2]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[57ce903a03496bf9]::util::run_in_thread_pool_with_globals<rustc_interface[57ce903a03496bf9]::interface::run_compiler<(), rustc_driver_impl[95c3c1d9dfa1b237]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#2}::{closure#1}, ()>
  14:     0x7f424c856354 - <<std[c489bf36f52f5dc2]::thread::Builder>::spawn_unchecked_<rustc_interface[57ce903a03496bf9]::util::run_in_thread_pool_with_globals<rustc_interface[57ce903a03496bf9]::interface::run_compiler<(), rustc_driver_impl[95c3c1d9dfa1b237]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#2}::{closure#1}, ()>::{closure#1} as core[52939b5d39e1ed]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  15:     0x7f424ec02e81 - std::sys::pal::unix::thread::Thread::new::thread_start::h7965b84efbea71a3
  16:     0x7f424907d148 - start_thread
  17:     0x7f42491010cc - __GI___clone3
  18:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

rustc version

> rustc -Vv
rustc 1.86.0-nightly (b3b368a18 2025-01-05)
binary: rustc
commit-hash: b3b368a1833a26f5d48f51c45159f46e6cd01711
commit-date: 2025-01-05
host: x86_64-unknown-linux-gnu
release: 1.86.0-nightly
LLVM version: 19.1.6

Rollup merge of rust-lang#140358 - Zoxc:variance-cycle, r=oli-obk Use `search_for_cycle_permutation` to look for `variances_of` This uses `search_for_cycle_permutation` to look for `variances_of` in case `variances_of` is not the first query in the cycle. This may fix rust-lang#124423 and rust-lang#127971. r? `@oli-obk`

matthiaskrgr added I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. A-parallel-compiler Area: parallel compiler labels Apr 26, 2024

rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Apr 26, 2024

saethlin removed the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label May 8, 2024

SparrowLii mentioned this issue Oct 23, 2024

Add parallel front end robustness test to ui tests #132051

Open

This was referenced Apr 27, 2025

ICE: only 'variances_of' returns '&[ty::Variance]' #127971

Open

Use search_for_cycle_permutation to look for variances_of #140358

Merged

bors closed this as completed in fdfc7c0 Apr 27, 2025

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ICE: 'only `variances_of` returns `&[ty::Variance]`' #124423

ICE: 'only `variances_of` returns `&[ty::Variance]`' #124423

matthiaskrgr commented Apr 26, 2024

ranger-ross commented Jan 12, 2025 •

edited

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ICE: 'only variances_of returns &[ty::Variance]' #124423

ICE: 'only variances_of returns &[ty::Variance]' #124423

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matthiaskrgr commented Apr 26, 2024

Code

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Error output

ranger-ross commented Jan 12, 2025 • edited Loading

Backtrace

ICE: 'only `variances_of` returns `&[ty::Variance]`' #124423

ICE: 'only `variances_of` returns `&[ty::Variance]`' #124423

ranger-ross commented Jan 12, 2025 •

edited

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