ICE: Failed to normalize <[closure] as std::ops::FnOnce<(&S,)>>::Output

[matthiaskrgr]

code from rustc ./src/test/ui/type-alias-impl-trait/issue-72793.rs

// check-pass
// compile-flags: -Zmir-opt-level=3

#![feature(type_alias_impl_trait)]

trait T { type Item; }

type Alias<'a> = impl T<Item = &'a ()>;

struct S;
impl<'a> T for &'a S {
    type Item = &'a ();
}

fn filter_positive<'a>() -> Alias<'a> {
    &S
}

fn with_positive(fun: impl Fn(Alias<'_>)) {
    fun(filter_positive());
}

fn main() {
    with_positive(|_| ());
}

WARNING: Ignoring `RUSTC_WRAPPER` environment variable, Miri does not support wrapping.
    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
     Running `/home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo-miri target/miri/x86_64-unknown-linux-gnu/debug/m`
error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:199:90: Failed to normalize <[closure@src/main.rs:24:19: 24:22] as std::ops::FnOnce<(&S,)>>::Output, maybe try to call `try_normalize_erasing_regions` instead

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/compiler/rustc_errors/src/lib.rs:1392:9
stack backtrace:
   0:     0x7f7fc64a37a0 - std::backtrace_rs::backtrace::libunwind::trace::h763ecd2b1c94eb47
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   1:     0x7f7fc64a37a0 - std::backtrace_rs::backtrace::trace_unsynchronized::h7346e33da5e91dc9
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f7fc64a37a0 - std::sys_common::backtrace::_print_fmt::h8ca9befc16375e7f
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f7fc64a37a0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h35a76e8acc949815
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f7fc64fda2c - core::fmt::write::h1966177bbb3b1b76
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/core/src/fmt/mod.rs:1198:17
   5:     0x7f7fc6494f85 - std::io::Write::write_fmt::he17142a652adbfaa
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/io/mod.rs:1672:15
   6:     0x7f7fc64a6471 - std::sys_common::backtrace::_print::h58fd682547bc6ff7
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f7fc64a6471 - std::sys_common::backtrace::print::hb71ddfedfd79ba3f
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f7fc64a6471 - std::panicking::default_hook::{{closure}}::h866ffdcbb9391663
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/panicking.rs:295:22
   9:     0x7f7fc64a6143 - std::panicking::default_hook::hc53d610bee87e7b5
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/panicking.rs:314:9
  10:     0x7f7fc6d53731 - rustc_driver[ee492072531d29b9]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f7fc64a6c46 - std::panicking::rust_panic_with_hook::h1f2457f8494b1ce0
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/panicking.rs:702:17
  12:     0x7f7fc7dbfb31 - std[af12de6c3337c1b7]::panicking::begin_panic::<rustc_errors[30e8870fe27fb8ba]::ExplicitBug>::{closure#0}
  13:     0x7f7fc7dbee66 - std[af12de6c3337c1b7]::sys_common::backtrace::__rust_end_short_backtrace::<std[af12de6c3337c1b7]::panicking::begin_panic<rustc_errors[30e8870fe27fb8ba]::ExplicitBug>::{closure#0}, !>
  14:     0x7f7fc7d9cdd6 - std[af12de6c3337c1b7]::panicking::begin_panic::<rustc_errors[30e8870fe27fb8ba]::ExplicitBug>
  15:     0x7f7fc7d59ea6 - std[af12de6c3337c1b7]::panic::panic_any::<rustc_errors[30e8870fe27fb8ba]::ExplicitBug>
  16:     0x7f7fc7d55755 - <rustc_errors[30e8870fe27fb8ba]::HandlerInner>::bug::<&alloc[327c298d5f7f3986]::string::String>
  17:     0x7f7fc7d554b0 - <rustc_errors[30e8870fe27fb8ba]::Handler>::bug::<&alloc[327c298d5f7f3986]::string::String>
  18:     0x7f7fc7e142ad - rustc_middle[ba567b0c63397382]::ty::context::tls::with_context_opt::<rustc_middle[ba567b0c63397382]::ty::context::tls::with_opt<rustc_middle[ba567b0c63397382]::util::bug::opt_span_bug_fmt<rustc_span[e8a062c38fd06fcf]::span_encoding::Span>::{closure#0}, ()>::{closure#0}, ()>
  19:     0x7f7fc7e1a2b6 - rustc_middle[ba567b0c63397382]::util::bug::opt_span_bug_fmt::<rustc_span[e8a062c38fd06fcf]::span_encoding::Span>
  20:     0x7f7fc7e1a233 - rustc_middle[ba567b0c63397382]::util::bug::bug_fmt
  21:     0x7f7fc8d7daa7 - <rustc_middle[ba567b0c63397382]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_middle[ba567b0c63397382]::ty::fold::TypeFolder>::fold_ty
  22:     0x5623e49ee3c1 - rustc_middle[ba567b0c63397382]::ty::util::fold_list::<rustc_middle[ba567b0c63397382]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder, rustc_middle[ba567b0c63397382]::ty::Ty, <&rustc_middle[ba567b0c63397382]::ty::list::List<rustc_middle[ba567b0c63397382]::ty::Ty> as rustc_middle[ba567b0c63397382]::ty::fold::TypeFoldable>::try_fold_with<rustc_middle[ba567b0c63397382]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder>::{closure#0}>
  23:     0x5623e48f7af0 - <rustc_middle[ba567b0c63397382]::ty::context::TyCtxt>::normalize_erasing_late_bound_regions::<rustc_middle[ba567b0c63397382]::ty::sty::FnSig>
  24:     0x5623e495d99f - <rustc_const_eval[fabfa6a4d198841f]::interpret::eval_context::InterpCx<miri[ab945d3d15ab0ad0]::machine::Evaluator>>::terminator
  25:     0x5623e4933c3d - <core[7b47b893e00d8dca]::panic::unwind_safe::AssertUnwindSafe<miri[ab945d3d15ab0ad0]::eval::eval_entry::{closure#0}> as core[7b47b893e00d8dca]::ops::function::FnOnce<()>>::call_once
  26:     0x5623e4912e6c - miri[ab945d3d15ab0ad0]::eval::eval_entry
  27:     0x5623e4867c89 - <rustc_interface[c2045ebdcb88575c]::passes::QueryContext>::enter::<<miri[a2bdd18a035b3443]::MiriCompilerCalls as rustc_driver[ee492072531d29b9]::Callbacks>::after_analysis::{closure#0}, ()>
  28:     0x5623e486c653 - <miri[a2bdd18a035b3443]::MiriCompilerCalls as rustc_driver[ee492072531d29b9]::Callbacks>::after_analysis
  29:     0x7f7fc8f06c8b - <rustc_interface[c2045ebdcb88575c]::interface::Compiler>::enter::<rustc_driver[ee492072531d29b9]::run_compiler::{closure#1}::{closure#2}, core[7b47b893e00d8dca]::result::Result<core[7b47b893e00d8dca]::option::Option<rustc_interface[c2045ebdcb88575c]::queries::Linker>, rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>>
  30:     0x7f7fc8f02f3a - rustc_span[e8a062c38fd06fcf]::with_source_map::<core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>, rustc_interface[c2045ebdcb88575c]::interface::create_compiler_and_run<core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>, rustc_driver[ee492072531d29b9]::run_compiler::{closure#1}>::{closure#1}>
  31:     0x7f7fc8f1f360 - rustc_interface[c2045ebdcb88575c]::interface::create_compiler_and_run::<core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>, rustc_driver[ee492072531d29b9]::run_compiler::{closure#1}>
  32:     0x7f7fc8f33362 - <scoped_tls[7afe57960397b723]::ScopedKey<rustc_span[e8a062c38fd06fcf]::SessionGlobals>>::set::<rustc_interface[c2045ebdcb88575c]::interface::run_compiler<core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>, rustc_driver[ee492072531d29b9]::run_compiler::{closure#1}>::{closure#0}, core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>>
  33:     0x7f7fc8f0532f - std[af12de6c3337c1b7]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[c2045ebdcb88575c]::util::run_in_thread_pool_with_globals<rustc_interface[c2045ebdcb88575c]::interface::run_compiler<core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>, rustc_driver[ee492072531d29b9]::run_compiler::{closure#1}>::{closure#0}, core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>>::{closure#0}, core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>>
  34:     0x7f7fc8f1f7b9 - <<std[af12de6c3337c1b7]::thread::Builder>::spawn_unchecked_<rustc_interface[c2045ebdcb88575c]::util::run_in_thread_pool_with_globals<rustc_interface[c2045ebdcb88575c]::interface::run_compiler<core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>, rustc_driver[ee492072531d29b9]::run_compiler::{closure#1}>::{closure#0}, core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>>::{closure#0}, core[7b47b893e00d8dca]::result::Result<(), rustc_errors[30e8870fe27fb8ba]::ErrorGuaranteed>>::{closure#1} as core[7b47b893e00d8dca]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  35:     0x7f7fc64b0693 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2535c4f17d1ae00a
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/alloc/src/boxed.rs:1935:9
  36:     0x7f7fc64b0693 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9555fa64d2fdcc1f
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/alloc/src/boxed.rs:1935:9
  37:     0x7f7fc64b0693 - std::sys::unix::thread::Thread::new::thread_start::hcd4b7b87c76163e2
                               at /rustc/93ffde6f04d3d24327a4e17a2a2bf4f63c246235/library/std/src/sys/unix/thread.rs:108:17
  38:     0x7f7fc619954d - <unknown>
  39:     0x7f7fc621e874 - clone
  40:                0x0 - <unknown>

note: 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 1.64.0-nightly (93ffde6f0 2022-07-23) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type bin -C embed-bitcode=no -C debuginfo=2 -C incremental -C target-cpu=native

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack

Miri caused an ICE during evaluation. Here's the interpreter backtrace at the time of the panic:
note: the place in the program where the ICE was triggered
  --> src/main.rs:20:5
   |
20 |     fun(filter_positive());
   |     ^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: inside `with_positive::<[closure@src/main.rs:24:19: 24:22]>` at src/main.rs:20:5
note: inside `main` at src/main.rs:24:5
  --> src/main.rs:24:5
   |
24 |     with_positive(|_| ());
   |     ^^^^^^^^^^^^^^^^^^^^^
   = note: inside `<fn() as std::ops::FnOnce<()>>::call_once - shim(fn())` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:248:5
   = note: inside `std::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys_common/backtrace.rs:122:18
   = note: inside closure at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:145:18
   = note: inside `std::ops::function::impls::<impl std::ops::FnOnce<()> for &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>::call_once` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:280:13
   = note: inside `std::panicking::r#try::do_call::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:492:40
   = note: inside `std::panicking::r#try::<i32, &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:456:19
   = note: inside `std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:137:14
   = note: inside closure at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:128:48
   = note: inside `std::panicking::r#try::do_call::<[closure@std::rt::lang_start_internal::{closure#2}], isize>` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:492:40
   = note: inside `std::panicking::r#try::<isize, [closure@std::rt::lang_start_internal::{closure#2}]>` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:456:19
   = note: inside `std::panic::catch_unwind::<[closure@std::rt::lang_start_internal::{closure#2}], isize>` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:137:14
   = note: inside `std::rt::lang_start_internal` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:128:20
   = note: inside `std::rt::lang_start::<()>` at /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:144:17

error: aborting due to previous error

This has been fixed on the rustc side, why does this crash with miri now? 🤔

[RalfJung]

Uh, no idea... all that normalization stuff is a black box to me.^^ "Failed to normalize <[closure@src/main.rs:24:19: 24:22] as std::ops::FnOnce<(&S,)>>::Output" is odd, if it knows the closure type it should be able to just figure out the output type?

@oli-obk any idea?

[oli-obk]

if this is a recent regression, it could be due to rust-lang/rust#99383

Though... in RevealAll mode we should never actually constrain an opaque type and instead be revealing them... that's probably a bug in rustc.

[RalfJung]

Yeah, with the 2022-07-19 nightly there seems to be no ICE.

[RalfJung]

@ouz-a reports the problem remains after reverting their PR. OTOH I have confirmed that the problem definitely started with this rollup: rust-lang/rust#99506.

[RalfJung]

Uh... so with 3c3c5da9adfdf308b5189b8034c07e0dc5492a54 I get a different error, somehow?

>thread 'rustc' panicked at 'assertion failed: `(left == right)`
>  left: `Some(Obligation(predicate=Binder(TraitPredicate(<&S as std::marker::Sized>, polarity:Positive), []), depth=0))`,
> right: `None`', compiler/rustc_traits/src/normalize_erasing_regions.rs:LL:CC
>stack backtrace:
>   0: std::backtrace_rs::backtrace::libunwind::trace::h45c496ed2150e509
> at RUSTLIB/std/src/../../backtrace/src/backtrace/libunwind.rs:LL:CC
>   1: std::backtrace_rs::backtrace::trace_unsynchronized::h4a55eb92770e244f
> at RUSTLIB/std/src/../../backtrace/src/backtrace/mod.rs:LL:CC
>   2: std::sys_common::backtrace::_print_fmt::h0821ded70d0475c9
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hbbb39798153b4dd1
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   4: core::fmt::write::hdf3432484eef9649
> at RUSTLIB/core/src/fmt/mod.rs:LL:CC
>   5: std::io::Write::write_fmt::had572b91d539a41b
> at RUSTLIB/std/src/io/mod.rs:LL:CC
>   6: std::sys_common::backtrace::_print::h8a2961faada59383
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   7: std::sys_common::backtrace::print::h6e3d32371dd00b05
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   8: std::panicking::default_hook::{{closure}}::he6c029a195cbaf5c
>   9: std::panicking::default_hook::h32158034ae7d775d
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  10: <alloc[13b3ae67d8724159]::boxed::Box<dyn for<'a, 'b> core[5b8050c91244cb8c]::ops::function::Fn<(&'a core[5b8050c91244cb8c]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[5b8050c91244cb8c]::marker::Sync + core[5b8050c91244cb8c]::marker::Send> as core[5b8050c91244cb8c]::ops::function::Fn<(&core[5b8050c91244cb8c]::panic::panic_info::PanicInfo,)>>::call
> at RUSTLIB/alloc/src/boxed.rs:LL:CC
>  11: rustc_driver[ad1eb020797fdf50]::DEFAULT_HOOK::{closure#0}::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_driver/src/lib.rs:LL:CC
>  12: std::panicking::rust_panic_with_hook::hbeeb00606897b943
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  13: std::panicking::begin_panic_handler::{{closure}}::h8c1695f63e99aedd
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  14: std::sys_common::backtrace::__rust_end_short_backtrace::h7a1c515ec200c0bd
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>  15: rust_begin_unwind
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  16: core::panicking::panic_fmt::hab2abc629ba5f823
> at RUSTLIB/core/src/panicking.rs:LL:CC
>  17: core::panicking::assert_failed_inner::h15dec335fb309c3e
>  18: core[5b8050c91244cb8c]::panicking::assert_failed
> at RUSTLIB/core/src/panicking.rs:LL:CC
>  19: rustc_traits[cada738367de0cb2]::normalize_erasing_regions::try_normalize_after_erasing_regions::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_traits/src/normalize_erasing_regions.rs:LL:CC
>  20: <rustc_infer[c78697b5a9375a9f]::infer::InferCtxtBuilder>::enter
> at /home/r/src/rust/rustc/compiler/rustc_infer/src/infer/mod.rs:LL:CC
>  21: rustc_traits[cada738367de0cb2]::normalize_erasing_regions::try_normalize_after_erasing_regions
> at /home/r/src/rust/rustc/compiler/rustc_traits/src/normalize_erasing_regions.rs:LL:CC
>  22: rustc_traits[cada738367de0cb2]::normalize_erasing_regions::provide::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_traits/src/normalize_erasing_regions.rs:LL:CC
>  23: <rustc_traits[cada738367de0cb2]::normalize_erasing_regions::provide::{closure#0} as core[5b8050c91244cb8c]::ops::function::FnOnce<(rustc_middle[8b201c99d8595a14]::ty::context::TyCtxt, rustc_middle[8b201c99d8595a14]::ty::ParamEnvAnd<rustc_middle[8b201c99d8595a14]::ty::subst::GenericArg>)>>::call_once
> at RUSTLIB/core/src/ops/function.rs:LL:CC
>  24: <rustc_query_system[69dac6cd847e2dda]::query::config::QueryVtable<rustc_query_impl[bce8bd1772b237eb]::plumbing::QueryCtxt, rustc_middle[8b201c99d8595a14]::ty::ParamEnvAnd<rustc_middle[8b201c99d8595a14]::ty::subst::GenericArg>, core[5b8050c91244cb8c]::result::Result<rustc_middle[8b201c99d8595a14]::ty::subst::GenericArg, rustc_middle[8b201c99d8595a14]::traits::query::NoSolution>>>::compute
> at /home/r/src/rust/rustc/compiler/rustc_query_system/src/query/config.rs:LL:CC
>  25: rustc_query_system[69dac6cd847e2dda]::query::plumbing::execute_job::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_query_system/src/query/plumbing.rs:LL:CC
>  26: stacker[a19e7495bd0af162]::maybe_grow
> at /home/r/.cargo/registry/src/github.tiyicn.workers.dev-1ecc6299db9ec823/stacker-0.1.14/src/lib.rs:LL:CC
>  27: rustc_data_structures[680399caad47321f]::stack::ensure_sufficient_stack
> at /home/r/src/rust/rustc/compiler/rustc_data_structures/src/stack.rs:LL:CC
>  28: <rustc_query_impl[bce8bd1772b237eb]::plumbing::QueryCtxt as rustc_query_system[69dac6cd847e2dda]::query::QueryContext>::start_query::{closure#0}::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_query_impl/src/plumbing.rs:LL:CC
>  29: rustc_middle[8b201c99d8595a14]::ty::context::tls::enter_context::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  30: rustc_middle[8b201c99d8595a14]::ty::context::tls::set_tlv
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  31: rustc_middle[8b201c99d8595a14]::ty::context::tls::enter_context
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  32: <rustc_query_impl[bce8bd1772b237eb]::plumbing::QueryCtxt as rustc_query_system[69dac6cd847e2dda]::query::QueryContext>::start_query::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_query_impl/src/plumbing.rs:LL:CC
>  33: rustc_middle[8b201c99d8595a14]::ty::context::tls::with_related_context::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  34: rustc_middle[8b201c99d8595a14]::ty::context::tls::with_context::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  35: rustc_middle[8b201c99d8595a14]::ty::context::tls::with_context_opt
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  36: rustc_middle[8b201c99d8595a14]::ty::context::tls::with_context
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  37: rustc_middle[8b201c99d8595a14]::ty::context::tls::with_related_context
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  38: <rustc_query_impl[bce8bd1772b237eb]::plumbing::QueryCtxt as rustc_query_system[69dac6cd847e2dda]::query::QueryContext>::start_query
> at /home/r/src/rust/rustc/compiler/rustc_query_impl/src/plumbing.rs:LL:CC
>  39: rustc_query_system[69dac6cd847e2dda]::query::plumbing::execute_job
> at /home/r/src/rust/rustc/compiler/rustc_query_system/src/query/plumbing.rs:LL:CC
>  40: rustc_query_system[69dac6cd847e2dda]::query::plumbing::try_execute_query
> at /home/r/src/rust/rustc/compiler/rustc_query_system/src/query/plumbing.rs:LL:CC
>  41: rustc_query_system[69dac6cd847e2dda]::query::plumbing::get_query
> at /home/r/src/rust/rustc/compiler/rustc_query_system/src/query/plumbing.rs:LL:CC
>  42: <rustc_query_impl[bce8bd1772b237eb]::Queries as rustc_middle[8b201c99d8595a14]::ty::query::QueryEngine>::try_normalize_generic_arg_after_erasing_regions
> at /home/r/src/rust/rustc/compiler/rustc_query_impl/src/lib.rs:LL:CC
>  43: <rustc_middle[8b201c99d8595a14]::ty::query::TyCtxtAt>::try_normalize_generic_arg_after_erasing_regions
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/query.rs:LL:CC
>  44: <rustc_middle[8b201c99d8595a14]::ty::context::TyCtxt>::try_normalize_generic_arg_after_erasing_regions
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/query.rs:LL:CC
>  45: <rustc_middle[8b201c99d8595a14]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder>::normalize_generic_arg_after_erasing_regions
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:LL:CC
>  46: <rustc_middle[8b201c99d8595a14]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_middle[8b201c99d8595a14]::ty::fold::TypeFolder>::fold_ty
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:LL:CC
>  47: <rustc_middle[8b201c99d8595a14]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_middle[8b201c99d8595a14]::ty::fold::FallibleTypeFolder>::try_fold_ty
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/fold.rs:LL:CC
>  48: <rustc_middle[8b201c99d8595a14]::ty::Ty as rustc_middle[8b201c99d8595a14]::ty::fold::TypeFoldable>::try_fold_with
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/structural_impls.rs:LL:CC
>  49: rustc_middle[8b201c99d8595a14]::ty::util::fold_list::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/util.rs:LL:CC
>  50: core[5b8050c91244cb8c]::iter::traits::iterator::Iterator::find_map::check::{closure#0}
> at RUSTLIB/core/src/iter/traits/iterator.rs:LL:CC
>  51: <core[5b8050c91244cb8c]::iter::adapters::enumerate::Enumerate<_> as core[5b8050c91244cb8c]::iter::traits::iterator::Iterator>::try_fold::enumerate::{closure#0}
> at RUSTLIB/core/src/iter/adapters/enumerate.rs:LL:CC
>  52: <&mut core[5b8050c91244cb8c]::iter::adapters::copied::Copied<core[5b8050c91244cb8c]::slice::iter::Iter<rustc_middle[8b201c99d8595a14]::ty::Ty>> as core[5b8050c91244cb8c]::iter::traits::iterator::Iterator>::try_fold
> at RUSTLIB/core/src/iter/traits/iterator.rs:LL:CC
>  53: <core[5b8050c91244cb8c]::iter::adapters::enumerate::Enumerate<&mut core[5b8050c91244cb8c]::iter::adapters::copied::Copied<core[5b8050c91244cb8c]::slice::iter::Iter<rustc_middle[8b201c99d8595a14]::ty::Ty>>> as core[5b8050c91244cb8c]::iter::traits::iterator::Iterator>::try_fold
> at RUSTLIB/core/src/iter/adapters/enumerate.rs:LL:CC
>  54: <core[5b8050c91244cb8c]::iter::adapters::enumerate::Enumerate<&mut core[5b8050c91244cb8c]::iter::adapters::copied::Copied<core[5b8050c91244cb8c]::slice::iter::Iter<rustc_middle[8b201c99d8595a14]::ty::Ty>>> as core[5b8050c91244cb8c]::iter::traits::iterator::Iterator>::find_map
> at RUSTLIB/core/src/iter/traits/iterator.rs:LL:CC
>  55: rustc_middle[8b201c99d8595a14]::ty::util::fold_list
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/util.rs:LL:CC
>  56: <rustc_middle[8b201c99d8595a14]::ty::sty::FnSig as rustc_middle[8b201c99d8595a14]::ty::fold::TypeFoldable>::try_fold_with
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/sty.rs:LL:CC
>  57: <rustc_middle[8b201c99d8595a14]::ty::sty::FnSig as rustc_middle[8b201c99d8595a14]::ty::fold::TypeFoldable>::fold_with
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/fold.rs:LL:CC
>  58: <rustc_middle[8b201c99d8595a14]::ty::context::TyCtxt>::normalize_erasing_regions
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:LL:CC
>  59: <rustc_middle[8b201c99d8595a14]::ty::context::TyCtxt>::normalize_erasing_late_bound_regions
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:LL:CC
>  60: <rustc_const_eval[4ea2dcbffdb1ad3c]::interpret::eval_context::InterpCx<miri[218d66e17e4f8954]::machine::Evaluator>>::eval_terminator
> at /home/r/src/rust/rustc/compiler/rustc_const_eval/src/interpret/terminator.rs:LL:CC
>  61: <rustc_const_eval[4ea2dcbffdb1ad3c]::interpret::eval_context::InterpCx<miri[218d66e17e4f8954]::machine::Evaluator>>::terminator
> at /home/r/src/rust/rustc/compiler/rustc_const_eval/src/interpret/step.rs:LL:CC
>  62: <rustc_const_eval[4ea2dcbffdb1ad3c]::interpret::eval_context::InterpCx<miri[218d66e17e4f8954]::machine::Evaluator>>::step
> at /home/r/src/rust/rustc/compiler/rustc_const_eval/src/interpret/step.rs:LL:CC
>  63: miri[218d66e17e4f8954]::eval::eval_entry::{closure#0}
> at /home/r/src/rust/rustc/src/tools/miri/src/eval.rs:LL:CC
>  64: <miri[218d66e17e4f8954]::eval::eval_entry::{closure#0} as core[5b8050c91244cb8c]::ops::function::FnOnce<()>>::call_once
> at RUSTLIB/core/src/ops/function.rs:LL:CC
>  65: <core[5b8050c91244cb8c]::panic::unwind_safe::AssertUnwindSafe<miri[218d66e17e4f8954]::eval::eval_entry::{closure#0}> as core[5b8050c91244cb8c]::ops::function::FnOnce<()>>::call_once
> at RUSTLIB/core/src/panic/unwind_safe.rs:LL:CC
>  66: std[d84d995932d417c4]::panicking::try::do_call
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  67: std[d84d995932d417c4]::panicking::try
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  68: std[d84d995932d417c4]::panic::catch_unwind
> at RUSTLIB/std/src/panic.rs:LL:CC
>  69: miri[218d66e17e4f8954]::eval::eval_entry
> at /home/r/src/rust/rustc/src/tools/miri/src/eval.rs:LL:CC
>  70: <miri[272047cec92aca5d]::MiriCompilerCalls as rustc_driver[ad1eb020797fdf50]::Callbacks>::after_analysis::{closure#0}
> at /home/r/src/rust/rustc/src/tools/miri/src/bin/miri.rs:LL:CC
>  71: <rustc_interface[d35721db742c9398]::passes::QueryContext>::enter::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/passes.rs:LL:CC
>  72: rustc_middle[8b201c99d8595a14]::ty::context::tls::enter_context::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  73: rustc_middle[8b201c99d8595a14]::ty::context::tls::set_tlv
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  74: rustc_middle[8b201c99d8595a14]::ty::context::tls::enter_context
> at /home/r/src/rust/rustc/compiler/rustc_middle/src/ty/context.rs:LL:CC
>  75: <rustc_interface[d35721db742c9398]::passes::QueryContext>::enter
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/passes.rs:LL:CC
>  76: <miri[272047cec92aca5d]::MiriCompilerCalls as rustc_driver[ad1eb020797fdf50]::Callbacks>::after_analysis
> at /home/r/src/rust/rustc/src/tools/miri/src/bin/miri.rs:LL:CC
>  77: rustc_driver[ad1eb020797fdf50]::run_compiler::{closure#1}::{closure#2}
> at /home/r/src/rust/rustc/compiler/rustc_driver/src/lib.rs:LL:CC
>  78: <rustc_interface[d35721db742c9398]::interface::Compiler>::enter
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/queries.rs:LL:CC
>  79: rustc_driver[ad1eb020797fdf50]::run_compiler::{closure#1}
> at /home/r/src/rust/rustc/compiler/rustc_driver/src/lib.rs:LL:CC
>  80: rustc_interface[d35721db742c9398]::interface::create_compiler_and_run::{closure#1}
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/interface.rs:LL:CC
>  81: rustc_span[6115e481c46720f9]::with_source_map
> at /home/r/src/rust/rustc/compiler/rustc_span/src/lib.rs:LL:CC
>  82: rustc_interface[d35721db742c9398]::interface::create_compiler_and_run
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/interface.rs:LL:CC
>  83: rustc_interface[d35721db742c9398]::interface::run_compiler::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/interface.rs:LL:CC
>  84: <scoped_tls[e354f08e85e11ec1]::ScopedKey<rustc_span[6115e481c46720f9]::SessionGlobals>>::set
> at /home/r/.cargo/registry/src/github.tiyicn.workers.dev-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:LL:CC
>  85: rustc_span[6115e481c46720f9]::create_session_globals_then
> at /home/r/src/rust/rustc/compiler/rustc_span/src/lib.rs:LL:CC
>  86: rustc_interface[d35721db742c9398]::util::run_in_thread_pool_with_globals::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/util.rs:LL:CC
>  87: std[d84d995932d417c4]::sys_common::backtrace::__rust_begin_short_backtrace
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>  88: <std[d84d995932d417c4]::thread::Builder>::spawn_unchecked_::{closure#1}::{closure#0}
> at RUSTLIB/std/src/thread/mod.rs:LL:CC
>  89: <core[5b8050c91244cb8c]::panic::unwind_safe::AssertUnwindSafe<<std[d84d995932d417c4]::thread::Builder>::spawn_unchecked_<rustc_interface[d35721db742c9398]::util::run_in_thread_pool_with_globals<rustc_interface[d35721db742c9398]::interface::run_compiler<core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>, rustc_driver[ad1eb020797fdf50]::run_compiler::{closure#1}>::{closure#0}, core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>>::{closure#0}, core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>>::{closure#1}::{closure#0}> as core[5b8050c91244cb8c]::ops::function::FnOnce<()>>::call_once
> at RUSTLIB/core/src/panic/unwind_safe.rs:LL:CC
>  90: std[d84d995932d417c4]::panicking::try::do_call
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  91: std[d84d995932d417c4]::panicking::try
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  92: std[d84d995932d417c4]::panic::catch_unwind
> at RUSTLIB/std/src/panic.rs:LL:CC
>  93: <std[d84d995932d417c4]::thread::Builder>::spawn_unchecked_::{closure#1}
> at RUSTLIB/std/src/thread/mod.rs:LL:CC
>  94: <<std[d84d995932d417c4]::thread::Builder>::spawn_unchecked_<rustc_interface[d35721db742c9398]::util::run_in_thread_pool_with_globals<rustc_interface[d35721db742c9398]::interface::run_compiler<core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>, rustc_driver[ad1eb020797fdf50]::run_compiler::{closure#1}>::{closure#0}, core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>>::{closure#0}, core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>>::{closure#1} as core[5b8050c91244cb8c]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
> at RUSTLIB/core/src/ops/function.rs:LL:CC
>  95: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8a1dda340491a5ac
> at RUSTLIB/alloc/src/boxed.rs:LL:CC
>  96: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he8a925ef37b3c273
> at RUSTLIB/alloc/src/boxed.rs:LL:CC
>  97: std::sys::PLATFORM::thread::Thread::new::thread_start::h65cc7689d5c2f187
> at RUSTLIB/std/src/sys/PLATFORM/thread.rs:LL:CC
>  98: start_thread
>                               at ./nptl/./nptl/pthread_create.c:435:8
>  99: __GI___clone3
>                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
> 100: <unknown>
>
>error: internal compiler error: unexpected panic
>
>note: 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 1.64.0-dev running on x86_64-unknown-linux-gnu
>
>note: compiler flags: -Z ui-testing
>
>query stack during panic:
>#0 [try_normalize_generic_arg_after_erasing_regions] normalizing `<[closure@$DIR/ice.rs:LL:CC] as core::ops::function::FnOnce<(&S,)>>::Output`
>end of query stack
>
>Miri caused an ICE during evaluation. Here's the interpreter backtrace at the time of the panic:
>note: the place in the program where the ICE was triggered
>  --> $DIR/ice.rs:LL:CC
>   |
>LL |     fun(filter_positive());
>   |     ^^^^^^^^^^^^^^^^^^^^^^
>   |
>   = note: inside `with_positive::<[closure@$DIR/ice.rs:LL:CC]>` at $DIR/ice.rs:LL:CC
>note: inside `main` at $DIR/ice.rs:LL:CC
>  --> $DIR/ice.rs:LL:CC
>   |
>LL |     with_positive(|_| ());
>   |     ^^^^^^^^^^^^^^^^^^^^^
>   = note: inside `<fn() as std::ops::FnOnce<()>>::call_once - shim(fn())` at RUSTLIB/core/src/ops/function.rs:LL:CC
>   = note: inside `std::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>` at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   = note: inside closure at RUSTLIB/std/src/rt.rs:LL:CC
>   = note: inside `std::ops::function::impls::<impl std::ops::FnOnce<()> for &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>::call_once` at RUSTLIB/core/src/ops/function.rs:LL:CC
>   = note: inside `std::panicking::r#try::do_call::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>` at RUSTLIB/std/src/panicking.rs:LL:CC
>   = note: inside `std::panicking::r#try::<i32, &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>` at RUSTLIB/std/src/panicking.rs:LL:CC
>   = note: inside `std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>` at RUSTLIB/std/src/panic.rs:LL:CC
>   = note: inside closure at RUSTLIB/std/src/rt.rs:LL:CC
>   = note: inside `std::panicking::r#try::do_call::<[closure@std::rt::lang_start_internal::{closure#2}], isize>` at RUSTLIB/std/src/panicking.rs:LL:CC
>   = note: inside `std::panicking::r#try::<isize, [closure@std::rt::lang_start_internal::{closure#2}]>` at RUSTLIB/std/src/panicking.rs:LL:CC
>   = note: inside `std::panic::catch_unwind::<[closure@std::rt::lang_start_internal::{closure#2}], isize>` at RUSTLIB/std/src/panic.rs:LL:CC
>   = note: inside `std::rt::lang_start_internal` at RUSTLIB/std/src/rt.rs:LL:CC
>   = note: inside `std::rt::lang_start::<()>` at RUSTLIB/std/src/rt.rs:LL:CC
>
>error: internal compiler error: no errors encountered even though `delay_span_bug` issued
>
>error: internal compiler error: VecMap([(OpaqueTypeKey { def_id: DefId(0:7 ~ ice[ec0d]::Alias::{opaque#0}), substs: ['_#0r] }, OpaqueTypeDecl { hidden_type: OpaqueHiddenType { span: no-location (#0), ty: &S }, origin: TyAlias })])
>   |
>   = note: delayed at compiler/rustc_infer/src/infer/opaque_types/table.rs:LL:CC
>
>thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:LL:CC
>stack backtrace:
>   0: std::backtrace_rs::backtrace::libunwind::trace::h45c496ed2150e509
> at RUSTLIB/std/src/../../backtrace/src/backtrace/libunwind.rs:LL:CC
>   1: std::backtrace_rs::backtrace::trace_unsynchronized::h4a55eb92770e244f
> at RUSTLIB/std/src/../../backtrace/src/backtrace/mod.rs:LL:CC
>   2: std::sys_common::backtrace::_print_fmt::h0821ded70d0475c9
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hbbb39798153b4dd1
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   4: core::fmt::write::hdf3432484eef9649
> at RUSTLIB/core/src/fmt/mod.rs:LL:CC
>   5: std::io::Write::write_fmt::had572b91d539a41b
> at RUSTLIB/std/src/io/mod.rs:LL:CC
>   6: std::sys_common::backtrace::_print::h8a2961faada59383
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   7: std::sys_common::backtrace::print::h6e3d32371dd00b05
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>   8: std::panicking::default_hook::{{closure}}::he6c029a195cbaf5c
>   9: std::panicking::default_hook::h32158034ae7d775d
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  10: <alloc[13b3ae67d8724159]::boxed::Box<dyn for<'a, 'b> core[5b8050c91244cb8c]::ops::function::Fn<(&'a core[5b8050c91244cb8c]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[5b8050c91244cb8c]::marker::Sync + core[5b8050c91244cb8c]::marker::Send> as core[5b8050c91244cb8c]::ops::function::Fn<(&core[5b8050c91244cb8c]::panic::panic_info::PanicInfo,)>>::call
> at RUSTLIB/alloc/src/boxed.rs:LL:CC
>  11: rustc_driver[ad1eb020797fdf50]::DEFAULT_HOOK::{closure#0}::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_driver/src/lib.rs:LL:CC
>  12: std::panicking::rust_panic_with_hook::hbeeb00606897b943
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  13: std[d84d995932d417c4]::panicking::begin_panic::{closure#0}
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  14: std[d84d995932d417c4]::sys_common::backtrace::__rust_end_short_backtrace
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>  15: std[d84d995932d417c4]::panicking::begin_panic
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  16: std[d84d995932d417c4]::panic::panic_any
> at RUSTLIB/std/src/panic.rs:LL:CC
>  17: <rustc_errors[1f2e9c39b045ec0e]::HandlerInner>::flush_delayed
> at /home/r/src/rust/rustc/compiler/rustc_errors/src/lib.rs:LL:CC
>  18: <rustc_errors[1f2e9c39b045ec0e]::HandlerInner as core[5b8050c91244cb8c]::ops::drop::Drop>::drop
> at /home/r/src/rust/rustc/compiler/rustc_errors/src/lib.rs:LL:CC
>  19: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  20: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  21: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  22: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  23: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  24: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  25: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  26: <alloc[13b3ae67d8724159]::rc::Rc<rustc_session[e1ca85e9ac1110a0]::session::Session> as core[5b8050c91244cb8c]::ops::drop::Drop>::drop
> at RUSTLIB/alloc/src/rc.rs:LL:CC
>  27: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  28: core[5b8050c91244cb8c]::ptr::drop_in_place
> at RUSTLIB/core/src/ptr/mod.rs:LL:CC
>  29: rustc_interface[d35721db742c9398]::interface::create_compiler_and_run::{closure#1}
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/interface.rs:LL:CC
>  30: rustc_span[6115e481c46720f9]::with_source_map
> at /home/r/src/rust/rustc/compiler/rustc_span/src/lib.rs:LL:CC
>  31: rustc_interface[d35721db742c9398]::interface::create_compiler_and_run
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/interface.rs:LL:CC
>  32: rustc_interface[d35721db742c9398]::interface::run_compiler::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/interface.rs:LL:CC
>  33: <scoped_tls[e354f08e85e11ec1]::ScopedKey<rustc_span[6115e481c46720f9]::SessionGlobals>>::set
> at /home/r/.cargo/registry/src/github.tiyicn.workers.dev-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:LL:CC
>  34: rustc_span[6115e481c46720f9]::create_session_globals_then
> at /home/r/src/rust/rustc/compiler/rustc_span/src/lib.rs:LL:CC
>  35: rustc_interface[d35721db742c9398]::util::run_in_thread_pool_with_globals::{closure#0}
> at /home/r/src/rust/rustc/compiler/rustc_interface/src/util.rs:LL:CC
>  36: std[d84d995932d417c4]::sys_common::backtrace::__rust_begin_short_backtrace
> at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
>  37: <std[d84d995932d417c4]::thread::Builder>::spawn_unchecked_::{closure#1}::{closure#0}
> at RUSTLIB/std/src/thread/mod.rs:LL:CC
>  38: <core[5b8050c91244cb8c]::panic::unwind_safe::AssertUnwindSafe<<std[d84d995932d417c4]::thread::Builder>::spawn_unchecked_<rustc_interface[d35721db742c9398]::util::run_in_thread_pool_with_globals<rustc_interface[d35721db742c9398]::interface::run_compiler<core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>, rustc_driver[ad1eb020797fdf50]::run_compiler::{closure#1}>::{closure#0}, core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>>::{closure#0}, core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>>::{closure#1}::{closure#0}> as core[5b8050c91244cb8c]::ops::function::FnOnce<()>>::call_once
> at RUSTLIB/core/src/panic/unwind_safe.rs:LL:CC
>  39: std[d84d995932d417c4]::panicking::try::do_call
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  40: std[d84d995932d417c4]::panicking::try
> at RUSTLIB/std/src/panicking.rs:LL:CC
>  41: std[d84d995932d417c4]::panic::catch_unwind
> at RUSTLIB/std/src/panic.rs:LL:CC
>  42: <std[d84d995932d417c4]::thread::Builder>::spawn_unchecked_::{closure#1}
> at RUSTLIB/std/src/thread/mod.rs:LL:CC
>  43: <<std[d84d995932d417c4]::thread::Builder>::spawn_unchecked_<rustc_interface[d35721db742c9398]::util::run_in_thread_pool_with_globals<rustc_interface[d35721db742c9398]::interface::run_compiler<core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>, rustc_driver[ad1eb020797fdf50]::run_compiler::{closure#1}>::{closure#0}, core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>>::{closure#0}, core[5b8050c91244cb8c]::result::Result<(), rustc_errors[1f2e9c39b045ec0e]::ErrorGuaranteed>>::{closure#1} as core[5b8050c91244cb8c]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
> at RUSTLIB/core/src/ops/function.rs:LL:CC
>  44: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8a1dda340491a5ac
> at RUSTLIB/alloc/src/boxed.rs:LL:CC
>  45: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he8a925ef37b3c273
> at RUSTLIB/alloc/src/boxed.rs:LL:CC
>  46: std::sys::PLATFORM::thread::Thread::new::thread_start::h65cc7689d5c2f187
> at RUSTLIB/std/src/sys/PLATFORM/thread.rs:LL:CC
>  47: start_thread
>                               at ./nptl/./nptl/pthread_create.c:435:8
>  48: __GI___clone3
>                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
>  49: <unknown>
>
>note: 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 1.64.0-dev running on x86_64-unknown-linux-gnu
>
>note: compiler flags: -Z ui-testing
>
>query stack during panic:
>end of query stack
>thread panicked while panicking. aborting.

@ouz-a which error did you get after reverting, was it just some ICE or exactly the ICE that @matthiaskrgr reported?

[RalfJung]

Okay so this is fascinating. With just the first two PRs of the rollup, I get the above ICE. That is almost certainly rust-lang/rust#99345 (since the only other PR included yet is something about Apple Watch). When I also include rust-lang/rust#99383, I get the ICE @matthiaskrgr reports.

[RalfJung]

Yeah I think we are actually seeing 2 ICEs in one example. If I merge either rust-lang/rust#99345 or rust-lang/rust#99383, I get an ICE.

[compiler-errors]

@RalfJung how does one reproduce this error? I don't know how to pass a UI test to a locally built Miri.

[RalfJung]

Who are the people to ping for TAIT trouble? @oli-obk and @lcnr I guess?