ICE: non_lifetime_binders: unexpected bound ty in binder

[matthiaskrgr]

Code

#![feature(non_lifetime_binders)]

fn take(id: impl for<T> Fn(T) -> T) {}

fn main() {
    take(|x| x)
}

Meta

rustc --version --verbose:

rustc 1.71.0-nightly (39c6804b9 2023-04-19)
binary: rustc
commit-hash: 39c6804b92aa202369e402525cee329556bc1db0
commit-date: 2023-04-19
host: x86_64-unknown-linux-gnu
release: 1.71.0-nightly
LLVM version: 16.0.2

Error output

<output>

Backtrace

warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes
 --> treereduce.out:1:12
  |
1 | #![feature(non_lifetime_binders)]
  |            ^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
  = note: `#[warn(incomplete_features)]` on by default

error: internal compiler error: /rustc/39c6804b92aa202369e402525cee329556bc1db0/compiler/rustc_middle/src/ty/fold.rs:285:33: unexpected bound ty in binder: BoundTy { var: 0, kind: Anon }

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/39c6804b92aa202369e402525cee329556bc1db0/compiler/rustc_errors/src/lib.rs:1643:9
stack backtrace:
   0:     0x7f866c661d43 - std::backtrace_rs::backtrace::libunwind::trace::h2a7e49770a0c8eb3
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f866c661d43 - std::backtrace_rs::backtrace::trace_unsynchronized::h6a543332a97578fa
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f866c661d43 - std::sys_common::backtrace::_print_fmt::heb3e5fffa7940917
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f866c661d43 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h810a6e7cce2ac2e2
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f866c6c2daf - core::fmt::write::h9ad46b7c2a3eb976
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/core/src/fmt/mod.rs:1254:17
   5:     0x7f866c654d01 - std::io::Write::write_fmt::h1c9baacb87e6b9c9
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/io/mod.rs:1698:15
   6:     0x7f866c661b55 - std::sys_common::backtrace::_print::hca33eaa945a8a7ce
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f866c661b55 - std::sys_common::backtrace::print::h00199beaff62c71c
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f866c664807 - std::panicking::default_hook::{{closure}}::hd62eb02492041726
   9:     0x7f866c6645f5 - std::panicking::default_hook::hb077d6100095f68a
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/panicking.rs:288:9
  10:     0x7f866b4416e5 - <rustc_driver_impl[fc06c256dc1cd1a9]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[87dac7cd678aec56]::ops::function::FnOnce<(&core[87dac7cd678aec56]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7f866c664f45 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h616a4bdc344416e6
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/alloc/src/boxed.rs:1976:9
  12:     0x7f866c664f45 - std::panicking::rust_panic_with_hook::hd2d604a080396eb9
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/panicking.rs:695:13
  13:     0x7f866b9111a1 - std[ca44723e5ea5c648]::panicking::begin_panic::<rustc_errors[340b75cb71735eab]::ExplicitBug>::{closure#0}
  14:     0x7f866b90f4f6 - std[ca44723e5ea5c648]::sys_common::backtrace::__rust_end_short_backtrace::<std[ca44723e5ea5c648]::panicking::begin_panic<rustc_errors[340b75cb71735eab]::ExplicitBug>::{closure#0}, !>
  15:     0x7f866b96b2b6 - std[ca44723e5ea5c648]::panicking::begin_panic::<rustc_errors[340b75cb71735eab]::ExplicitBug>
  16:     0x7f866b995cb6 - <rustc_errors[340b75cb71735eab]::HandlerInner>::bug::<&alloc[27ecb065d74dda4e]::string::String>
  17:     0x7f866b995980 - <rustc_errors[340b75cb71735eab]::Handler>::bug::<&alloc[27ecb065d74dda4e]::string::String>
  18:     0x7f866b9688db - rustc_middle[6b53c1a405df2db5]::util::bug::opt_span_bug_fmt::<rustc_span[35742d543528875]::span_encoding::Span>::{closure#0}
  19:     0x7f866b9680da - rustc_middle[6b53c1a405df2db5]::ty::context::tls::with_opt::<rustc_middle[6b53c1a405df2db5]::util::bug::opt_span_bug_fmt<rustc_span[35742d543528875]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  20:     0x7f866b9680a6 - rustc_middle[6b53c1a405df2db5]::ty::context::tls::with_context_opt::<rustc_middle[6b53c1a405df2db5]::ty::context::tls::with_opt<rustc_middle[6b53c1a405df2db5]::util::bug::opt_span_bug_fmt<rustc_span[35742d543528875]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  21:     0x7f86695d42dd - rustc_middle[6b53c1a405df2db5]::util::bug::bug_fmt
  22:     0x7f866b6504dc - <rustc_middle[6b53c1a405df2db5]::ty::context::TyCtxt>::replace_late_bound_regions_uncached::<rustc_middle[6b53c1a405df2db5]::ty::sty::TraitRef, <rustc_middle[6b53c1a405df2db5]::ty::context::TyCtxt>::replace_late_bound_regions<rustc_middle[6b53c1a405df2db5]::ty::sty::TraitRef, <rustc_middle[6b53c1a405df2db5]::ty::context::TyCtxt>::erase_late_bound_regions<rustc_middle[6b53c1a405df2db5]::ty::sty::TraitRef>::{closure#0}>::{closure#0}>::{closure#0}
  23:     0x7f8669625611 - <rustc_middle[6b53c1a405df2db5]::ty::fold::BoundVarReplacer<rustc_middle[6b53c1a405df2db5]::ty::fold::FnMutDelegate> as rustc_type_ir[7988ade75723acf4]::fold::FallibleTypeFolder<rustc_middle[6b53c1a405df2db5]::ty::context::TyCtxt>>::try_fold_ty
  24:     0x7f86696248a0 - <&rustc_middle[6b53c1a405df2db5]::ty::list::List<rustc_middle[6b53c1a405df2db5]::ty::Ty> as rustc_type_ir[7988ade75723acf4]::fold::TypeFoldable<rustc_middle[6b53c1a405df2db5]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[6b53c1a405df2db5]::ty::fold::BoundVarReplacer<rustc_middle[6b53c1a405df2db5]::ty::fold::FnMutDelegate>>
  25:     0x7f8669a07187 - <rustc_hir_typeck[5d0bc6618fe00cd3]::fn_ctxt::FnCtxt>::check_expr_closure
  26:     0x7f866997e525 - <rustc_hir_typeck[5d0bc6618fe00cd3]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  27:     0x7f8669584c3e - <rustc_hir_typeck[5d0bc6618fe00cd3]::fn_ctxt::FnCtxt>::check_argument_types
  28:     0x7f8669561c3b - <rustc_hir_typeck[5d0bc6618fe00cd3]::fn_ctxt::FnCtxt>::check_call
  29:     0x7f866997a639 - <rustc_hir_typeck[5d0bc6618fe00cd3]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  30:     0x7f86699c1519 - <rustc_hir_typeck[5d0bc6618fe00cd3]::fn_ctxt::FnCtxt>::check_block_with_expected
  31:     0x7f866997ae64 - <rustc_hir_typeck[5d0bc6618fe00cd3]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  32:     0x7f8669b857dd - <rustc_hir_typeck[5d0bc6618fe00cd3]::fn_ctxt::FnCtxt>::check_return_expr
  33:     0x7f8669b7d96a - rustc_hir_typeck[5d0bc6618fe00cd3]::check::check_fn
  34:     0x7f8669b65b23 - rustc_hir_typeck[5d0bc6618fe00cd3]::typeck
  35:     0x7f86694dd309 - rustc_query_system[cc3f2816497b0dda]::query::plumbing::try_execute_query::<rustc_query_impl[d5b511e0af106fac]::queries::typeck, rustc_query_impl[d5b511e0af106fac]::plumbing::QueryCtxt>
  36:     0x7f866abb7570 - rustc_data_structures[a36227c7e9b5ca0d]::sync::par_for_each_in::<&[rustc_span[35742d543528875]::def_id::LocalDefId], <rustc_middle[6b53c1a405df2db5]::hir::map::Map>::par_body_owners<rustc_hir_typeck[5d0bc6618fe00cd3]::typeck_item_bodies::{closure#0}>::{closure#0}>
  37:     0x7f866abb731e - rustc_hir_typeck[5d0bc6618fe00cd3]::typeck_item_bodies
  38:     0x7f866ac3b717 - rustc_query_system[cc3f2816497b0dda]::query::plumbing::try_execute_query::<rustc_query_impl[d5b511e0af106fac]::queries::typeck_item_bodies, rustc_query_impl[d5b511e0af106fac]::plumbing::QueryCtxt>
  39:     0x7f866ac3b42c - <rustc_query_impl[d5b511e0af106fac]::Queries as rustc_middle[6b53c1a405df2db5]::ty::query::QueryEngine>::typeck_item_bodies
  40:     0x7f866a809dbc - rustc_hir_analysis[b76cf653628f06f0]::check_crate
  41:     0x7f866a803bad - rustc_interface[582898756836a6b1]::passes::analysis
  42:     0x7f866aba3702 - rustc_query_system[cc3f2816497b0dda]::query::plumbing::try_execute_query::<rustc_query_impl[d5b511e0af106fac]::queries::analysis, rustc_query_impl[d5b511e0af106fac]::plumbing::QueryCtxt>
  43:     0x7f866aba3410 - <rustc_query_impl[d5b511e0af106fac]::Queries as rustc_middle[6b53c1a405df2db5]::ty::query::QueryEngine>::analysis
  44:     0x7f866aa640e6 - <std[ca44723e5ea5c648]::thread::local::LocalKey<core[87dac7cd678aec56]::cell::Cell<*const ()>>>::with::<rustc_middle[6b53c1a405df2db5]::ty::context::tls::enter_context<<rustc_middle[6b53c1a405df2db5]::ty::context::GlobalCtxt>::enter<rustc_driver_impl[fc06c256dc1cd1a9]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>>::{closure#0}, core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>>::{closure#0}, core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>>
  45:     0x7f866a63dca8 - <rustc_interface[582898756836a6b1]::interface::Compiler>::enter::<rustc_driver_impl[fc06c256dc1cd1a9]::run_compiler::{closure#1}::{closure#2}, core[87dac7cd678aec56]::result::Result<core[87dac7cd678aec56]::option::Option<rustc_interface[582898756836a6b1]::queries::Linker>, rustc_span[35742d543528875]::ErrorGuaranteed>>
  46:     0x7f866a637caf - rustc_span[35742d543528875]::set_source_map::<core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>, rustc_interface[582898756836a6b1]::interface::run_compiler<core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>, rustc_driver_impl[fc06c256dc1cd1a9]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  47:     0x7f866a6378c8 - <scoped_tls[73fb7a08bc8a4c85]::ScopedKey<rustc_span[35742d543528875]::SessionGlobals>>::set::<rustc_interface[582898756836a6b1]::interface::run_compiler<core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>, rustc_driver_impl[fc06c256dc1cd1a9]::run_compiler::{closure#1}>::{closure#0}, core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>>
  48:     0x7f866a636edb - std[ca44723e5ea5c648]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[582898756836a6b1]::util::run_in_thread_pool_with_globals<rustc_interface[582898756836a6b1]::interface::run_compiler<core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>, rustc_driver_impl[fc06c256dc1cd1a9]::run_compiler::{closure#1}>::{closure#0}, core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>>
  49:     0x7f866ad09431 - <<std[ca44723e5ea5c648]::thread::Builder>::spawn_unchecked_<rustc_interface[582898756836a6b1]::util::run_in_thread_pool_with_globals<rustc_interface[582898756836a6b1]::interface::run_compiler<core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>, rustc_driver_impl[fc06c256dc1cd1a9]::run_compiler::{closure#1}>::{closure#0}, core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[87dac7cd678aec56]::result::Result<(), rustc_span[35742d543528875]::ErrorGuaranteed>>::{closure#1} as core[87dac7cd678aec56]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  50:     0x7f866c66f3d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::haab69effe0fa19e3
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/alloc/src/boxed.rs:1962:9
  51:     0x7f866c66f3d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb0775fd74e9e7829
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/alloc/src/boxed.rs:1962:9
  52:     0x7f866c66f3d5 - std::sys::unix::thread::Thread::new::thread_start::h0e7436fc32c0c985
                               at /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/std/src/sys/unix/thread.rs:108:17
  53:     0x7f8668094bb5 - <unknown>
  54:     0x7f8668116d90 - <unknown>
  55:                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: rustc 1.71.0-nightly (39c6804b9 2023-04-19) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `main`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error; 1 warning emitted

[fmease]

Duplicate of #108814.