Generic `(&A -> T) -> (&'a A -> Box<dyn Any + 'a>)` crashes

[ItzShiney]

I'm not sure if this is a minimal example, but I couldn't shrink it any more.

Generic T is necessary, A can be any type.

Code

type A = ();

fn f<T>(f: impl FnOnce(&A) -> T) -> impl for<'a> FnOnce(&'a A) -> Box<dyn std::any::Any + 'a> {
    move |a| Box::new(f(a))
}

Meta

The bug exists in both the latest stable and the latest nightly.

rustc --version --verbose:

rustc 1.78.0 (9b00956e5 2024-04-29)
binary: rustc
commit-hash: 9b00956e56009bab2aa15d7bff10916599e3d6d6
commit-date: 2024-04-29
host: x86_64-pc-windows-msvc
release: 1.78.0
LLVM version: 18.1.2

rustc 1.80.0-nightly (f67a1acc0 2024-06-01)
binary: rustc
commit-hash: f67a1acc04c7ecbf05751b17592dd8d245b75256
commit-date: 2024-06-01
host: x86_64-pc-windows-msvc
release: 1.80.0-nightly
LLVM version: 18.1.6

Error output

thread 'rustc' panicked at compiler\rustc_borrowck\src\type_check\free_region_relations.rs:97:9:
can't find an upper bound!?

Backtrace

stack backtrace:
   0:     0x7ffd6322d623 - std::backtrace_rs::backtrace::dbghelp64::trace
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\..\..\backtrace\src\backtrace\dbghelp64.rs:91
   1:     0x7ffd6322d623 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ffd6322d623 - std::backtrace::Backtrace::create
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\backtrace.rs:331
   3:     0x7ffd6322d56a - std::backtrace::Backtrace::force_capture
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\backtrace.rs:312
   4:     0x7ffd5f276140 - memchr
   5:     0x7ffd63247187 - alloc::boxed::impl$50::call
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\alloc\src\boxed.rs:2077
   6:     0x7ffd63247187 - std::panicking::rust_panic_with_hook
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\panicking.rs:799
   7:     0x7ffd63246fd9 - std::panicking::begin_panic_handler::closure$0
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\panicking.rs:656
   8:     0x7ffd6324450f - std::sys_common::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$>
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\sys_common\backtrace.rs:171
   9:     0x7ffd63246cc8 - std::panicking::begin_panic_handler
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\panicking.rs:652
  10:     0x7ffd6329e054 - core::panicking::panic_fmt
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\core\src\panicking.rs:72
  11:     0x7ffd5f9a01c6 - <rustc_borrowck[47dc6bdb74f71e32]::region_infer::RegionInferenceContext>::eval_equal
  12:     0x7ffd5e41001e - rustc_borrowck[47dc6bdb74f71e32]::dataflow::calculate_borrows_out_of_scope_at_location
  13:     0x7ffd5e4f66e1 - <rustc_borrowck[47dc6bdb74f71e32]::type_check::relate_tys::NllTypeRelating as rustc_middle[415a98e6f835205a]::ty::relate::TypeRelation>::regions
  14:     0x7ffd5e45b7fc - rustc_borrowck[47dc6bdb74f71e32]::mir_borrowck
  15:     0x7ffd5e91619a - rustc_query_impl[f6e26b53264cdf7d]::plumbing::query_key_hash_verify_all
  16:     0x7ffd5e860989 - rustc_ty_utils[2e11d027a4d062f9]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  17:     0x7ffd5e91fc2f - rustc_query_impl[f6e26b53264cdf7d]::plumbing::query_key_hash_verify_all
  18:     0x7ffd5d8b01d8 - <rustc_pattern_analysis[cee2a93862cfc37c]::rustc::RustcPatCtxt as rustc_pattern_analysis[cee2a93862cfc37c]::PatCx>::lint_non_contiguous_range_endpoints
  19:     0x7ffd5d8ca93a - <rustc_borrowck[47dc6bdb74f71e32]::type_check::relate_tys::NllTypeRelating as rustc_infer[97ab8c565f63bbbc]::infer::relate::combine::ObligationEmittingRelation>::register_obligations
  20:     0x7ffd5e4b2e87 - <rustc_borrowck[47dc6bdb74f71e32]::type_check::relate_tys::NllTypeRelating as rustc_middle[415a98e6f835205a]::ty::relate::TypeRelation>::regions
  21:     0x7ffd5e435c3f - <&mut rustc_borrowck[47dc6bdb74f71e32]::type_check::constraint_conversion::ConstraintConversion as rustc_infer[97ab8c565f63bbbc]::infer::outlives::obligations::TypeOutlivesDelegate>::push_verify
  22:     0x7ffd5e403ee7 - rustc_borrowck[47dc6bdb74f71e32]::dataflow::calculate_borrows_out_of_scope_at_location
  23:     0x7ffd5e4f66e1 - <rustc_borrowck[47dc6bdb74f71e32]::type_check::relate_tys::NllTypeRelating as rustc_middle[415a98e6f835205a]::ty::relate::TypeRelation>::regions
  24:     0x7ffd5e45b7fc - rustc_borrowck[47dc6bdb74f71e32]::mir_borrowck
  25:     0x7ffd5e91619a - rustc_query_impl[f6e26b53264cdf7d]::plumbing::query_key_hash_verify_all
  26:     0x7ffd5e860989 - rustc_ty_utils[2e11d027a4d062f9]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  27:     0x7ffd5e91fc2f - rustc_query_impl[f6e26b53264cdf7d]::plumbing::query_key_hash_verify_all
  28:     0x7ffd5e0d6245 - <rustc_hir_typeck[8b16c411857e2a7d]::upvar::InferBorrowKind as rustc_hir_typeck[8b16c411857e2a7d]::expr_use_visitor::Delegate>::borrow
  29:     0x7ffd5d829b13 - rustc_hir_analysis[fa2df6f2e5566255]::collect::type_of::type_of_opaque
  30:     0x7ffd5da99a4a - <dyn std[bf373edb648c61c3]::io::Write as nu_ansi_term[7ca241b111b77143]::write::AnyWrite>::write_str
  31:     0x7ffd5e809f2f - rustc_ty_utils[2e11d027a4d062f9]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  32:     0x7ffd5daa0a55 - rustc_query_impl[f6e26b53264cdf7d]::query_system
  33:     0x7ffd5f601bef - <rustc_hir_typeck[8b16c411857e2a7d]::upvar::InferBorrowKind as rustc_hir_typeck[8b16c411857e2a7d]::expr_use_visitor::Delegate>::mutate
  34:     0x7ffd5e13b958 - rustc_hir_analysis[fa2df6f2e5566255]::collect::type_of::type_of
  35:     0x7ffd5e91759f - rustc_query_impl[f6e26b53264cdf7d]::plumbing::query_key_hash_verify_all
  36:     0x7ffd5e809f2f - rustc_ty_utils[2e11d027a4d062f9]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  37:     0x7ffd5e918c56 - rustc_query_impl[f6e26b53264cdf7d]::plumbing::query_key_hash_verify_all
  38:     0x7ffd5f601bef - <rustc_hir_typeck[8b16c411857e2a7d]::upvar::InferBorrowKind as rustc_hir_typeck[8b16c411857e2a7d]::expr_use_visitor::Delegate>::mutate
  39:     0x7ffd5e1026a4 - rustc_hir_analysis[fa2df6f2e5566255]::check::wfcheck::check_well_formed
  40:     0x7ffd5e91685a - rustc_query_impl[f6e26b53264cdf7d]::plumbing::query_key_hash_verify_all
  41:     0x7ffd5e866e35 - rustc_ty_utils[2e11d027a4d062f9]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  42:     0x7ffd5e926039 - rustc_query_impl[f6e26b53264cdf7d]::plumbing::query_key_hash_verify_all
  43:     0x7ffd5e11498e - rustc_hir_analysis[fa2df6f2e5566255]::check::wfcheck::check_mod_type_wf
  44:     0x7ffd5da9a64a - <dyn std[bf373edb648c61c3]::io::Write as nu_ansi_term[7ca241b111b77143]::write::AnyWrite>::write_str
  45:     0x7ffd5d9e5f45 - rustc_ty_utils[2e11d027a4d062f9]::ty::adt_sized_constraint
  46:     0x7ffd5daabbc2 - rustc_query_impl[f6e26b53264cdf7d]::query_system
  47:     0x7ffd5e1562df - rustc_hir_analysis[fa2df6f2e5566255]::check_crate
  48:     0x7ffd5deb27f2 - <rustc_interface[3972c3fa63dc4815]::passes::LintStoreExpandImpl as rustc_expand[aab009fac10e5cb6]::base::LintStoreExpand>::pre_expansion_lint
  49:     0x7ffd5b0f7517 - rustc_interface[3972c3fa63dc4815]::passes::create_global_ctxt
  50:     0x7ffd5da9c0ba - <dyn std[bf373edb648c61c3]::io::Write as nu_ansi_term[7ca241b111b77143]::write::AnyWrite>::write_str
  51:     0x7ffd5d9bbfc9 - rustc_ty_utils[2e11d027a4d062f9]::ty::adt_sized_constraint
  52:     0x7ffd5daa1623 - rustc_query_impl[f6e26b53264cdf7d]::query_system
  53:     0x7ffd5b0b4d8d - _LNan_C
  54:     0x7ffd5b0b214f - _LNan_C
  55:     0x7ffd5b0b9e49 - _LNan_C
  56:     0x7ffd6325838d - alloc::boxed::impl$48::call_once
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\alloc\src\boxed.rs:2063
  57:     0x7ffd6325838d - alloc::boxed::impl$48::call_once
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\alloc\src\boxed.rs:2063
  58:     0x7ffd6325838d - std::sys::pal::windows::thread::impl$0::new::thread_start
                               at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\sys\pal\windows\thread.rs:52
  59:     0x7ffddef27344 - BaseThreadInitThunk
  60:     0x7ffddf8226b1 - RtlUserThreadStart


rustc version: 1.80.0-nightly (f67a1acc0 2024-06-01)
platform: x86_64-pc-windows-msvc

query stack during panic:
#0 [mir_borrowck] borrow-checking `f::{closure#0}`
#1 [mir_borrowck] borrow-checking `f`
#2 [type_of_opaque] computing type of opaque `f::{opaque#0}`
#3 [type_of] computing type of `f::{opaque#0}`
#4 [check_well_formed] checking that `f::{opaque#0}` is well-formed
#5 [check_mod_type_wf] checking that types are well-formed in top-level module
#6 [analysis] running analysis passes on this crate
end of query stack
delayed bug: {OpaqueTypeKey { def_id: DefId(0:10 ~ testing[c4fb]::f::{opaque#0}), args: [T/#0, impl FnOnce(&A) -> T/#1] }: OpaqueTypeDecl { hidden_type: OpaqueHiddenType { span: src\lib.rs:4:5: 4:28 (#0), ty: Closure(DefId(0:7 ~ testing[c4fb]::f::{closure#0}), [T/#0, impl FnOnce(&A) -> T/#1, i32, Binder(extern "RustCall" fn((&'^0 (),)) -> std::boxed::Box<dyn [Binder(Trait(std::any::Any), [])] + '^0, std::alloc::Global>, [Region(BrAnon)]), (impl FnOnce(&A) -> T/#1,)]) } }}
   0: std::backtrace_rs::backtrace::dbghelp64::trace
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\..\..\backtrace\src\backtrace\dbghelp64.rs:91
   1: std::backtrace_rs::backtrace::trace_unsynchronized
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2: std::backtrace::Backtrace::create
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\backtrace.rs:331
   3: std::backtrace::Backtrace::capture
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\backtrace.rs:296
   4: <rustc_errors::DiagCtxt>::emit_future_breakage_report
   5: <rustc_errors::DiagCtxt>::emit_diagnostic
   6: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
   7: <rustc_infer::infer::opaque_types::table::OpaqueTypeStorage as core::ops::drop::Drop>::drop
   8: rustc_pattern_analysis::analyze_match
   9: <rustc_pattern_analysis::errors::NonExhaustiveOmittedPatternLintOnArm as rustc_errors::diagnostic::LintDiagnostic<()>>::decorate_lint
  10: <rustc_borrowck::type_check::relate_tys::NllTypeRelating as rustc_middle::ty::relate::TypeRelation>::regions
  11: _CallSettingFrame
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\amd64\handlers.asm:49
  12: __FrameHandler3::FrameUnwindToState
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\frame.cpp:1222
  13: __FrameHandler3::FrameUnwindToEmptyState
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\risctrnsctrl.cpp:255
  14: __InternalCxxFrameHandler<__FrameHandler3>
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\frame.cpp:355
  15: __CxxFrameHandler3
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\risctrnsctrl.cpp:281
  16: _chkstk
  17: RtlUnwindEx
  18: __FrameHandler3::UnwindNestedFrames
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\risctrnsctrl.cpp:759
  19: CatchIt<__FrameHandler3>
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\frame.cpp:1326
  20: FindHandler<__FrameHandler3>
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\frame.cpp:670
  21: __InternalCxxFrameHandler<__FrameHandler3>
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\frame.cpp:396
  22: __CxxFrameHandler3
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\risctrnsctrl.cpp:281
  23: _chkstk
  24: RtlRaiseException
  25: RtlRaiseException
  26: RaiseException
  27: _CxxThrowException
             at D:\a\_work\1\s\src\vctools\crt\vcruntime\src\eh\throw.cpp:81
  28: panic_unwind::real_imp::panic
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\panic_unwind\src\seh.rs:353
  29: panic_unwind::__rust_start_panic
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\panic_unwind\src\lib.rs:108
  30: std::panicking::rust_panic
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\panicking.rs:847
  31: std::panicking::rust_panic_with_hook
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\panicking.rs:817
  32: std::panicking::begin_panic_handler::closure$0
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\panicking.rs:656
  33: std::sys_common::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$>
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\sys_common\backtrace.rs:171
  34: std::panicking::begin_panic_handler
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\panicking.rs:652
  35: core::panicking::panic_fmt
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\core\src\panicking.rs:72
  36: <rustc_borrowck::region_infer::RegionInferenceContext>::eval_equal
  37: rustc_borrowck::dataflow::calculate_borrows_out_of_scope_at_location
  38: <rustc_borrowck::type_check::relate_tys::NllTypeRelating as rustc_middle::ty::relate::TypeRelation>::regions
  39: rustc_borrowck::mir_borrowck
  40: rustc_query_impl::plumbing::query_key_hash_verify_all
  41: rustc_ty_utils::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  42: rustc_query_impl::plumbing::query_key_hash_verify_all
  43: <rustc_pattern_analysis::rustc::RustcPatCtxt as rustc_pattern_analysis::PatCx>::lint_non_contiguous_range_endpoints
  44: <rustc_borrowck::type_check::relate_tys::NllTypeRelating as rustc_infer::infer::relate::combine::ObligationEmittingRelation>::register_obligations
  45: <rustc_borrowck::type_check::relate_tys::NllTypeRelating as rustc_middle::ty::relate::TypeRelation>::regions
  46: <&mut rustc_borrowck::type_check::constraint_conversion::ConstraintConversion as rustc_infer::infer::outlives::obligations::TypeOutlivesDelegate>::push_verify
  47: rustc_borrowck::dataflow::calculate_borrows_out_of_scope_at_location
  48: <rustc_borrowck::type_check::relate_tys::NllTypeRelating as rustc_middle::ty::relate::TypeRelation>::regions
  49: rustc_borrowck::mir_borrowck
  50: rustc_query_impl::plumbing::query_key_hash_verify_all
  51: rustc_ty_utils::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  52: rustc_query_impl::plumbing::query_key_hash_verify_all
  53: <rustc_hir_typeck::upvar::InferBorrowKind as rustc_hir_typeck::expr_use_visitor::Delegate>::borrow
  54: rustc_hir_analysis::collect::type_of::type_of_opaque
  55: <dyn std::io::Write as nu_ansi_term::write::AnyWrite>::write_str
  56: rustc_ty_utils::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  57: rustc_query_impl::query_system
  58: <rustc_hir_typeck::upvar::InferBorrowKind as rustc_hir_typeck::expr_use_visitor::Delegate>::mutate
  59: rustc_hir_analysis::collect::type_of::type_of
  60: rustc_query_impl::plumbing::query_key_hash_verify_all
  61: rustc_ty_utils::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  62: rustc_query_impl::plumbing::query_key_hash_verify_all
  63: <rustc_hir_typeck::upvar::InferBorrowKind as rustc_hir_typeck::expr_use_visitor::Delegate>::mutate
  64: rustc_hir_analysis::check::wfcheck::check_well_formed
  65: rustc_query_impl::plumbing::query_key_hash_verify_all
  66: rustc_ty_utils::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  67: rustc_query_impl::plumbing::query_key_hash_verify_all
  68: rustc_hir_analysis::check::wfcheck::check_mod_type_wf
  69: <dyn std::io::Write as nu_ansi_term::write::AnyWrite>::write_str
  70: rustc_ty_utils::ty::adt_sized_constraint
  71: rustc_query_impl::query_system
  72: rustc_hir_analysis::check_crate
  73: <rustc_interface::passes::LintStoreExpandImpl as rustc_expand::base::LintStoreExpand>::pre_expansion_lint
  74: rustc_interface::passes::create_global_ctxt
  75: <dyn std::io::Write as nu_ansi_term::write::AnyWrite>::write_str
  76: rustc_ty_utils::ty::adt_sized_constraint
  77: rustc_query_impl::query_system
  78: _LNan_C
  79: _LNan_C
  80: _LNan_C
  81: alloc::boxed::impl$48::call_once
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\alloc\src\boxed.rs:2063
  82: alloc::boxed::impl$48::call_once
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\alloc\src\boxed.rs:2063
  83: std::sys::pal::windows::thread::impl$0::new::thread_start
             at /rustc/f67a1acc04c7ecbf05751b17592dd8d245b75256/library\std\src\sys\pal\windows\thread.rs:52
  84: BaseThreadInitThunk
  85: RtlUserThreadStart

[matthiaskrgr]

probably duplicate of #122704

[matthiaskrgr]

proly related to #122704

[theemathas]

I tried to minimize this, and I can't go smaller than this:

trait IsStatic: 'static {}

impl<T: 'static> IsStatic for T {}

fn foo<T>(x: Box<T>) -> impl for<'a> FnOnce(&'a ()) -> Box<dyn IsStatic + 'a> {
    move |_| x
}

Error output

   Compiling playground v0.0.1 (/playground)
thread 'rustc' panicked at compiler/rustc_borrowck/src/type_check/free_region_relations.rs:97:9:
can't find an upper bound!?
stack backtrace:
   0:     0x7f68c8ef2ae5 - std::backtrace_rs::backtrace::libunwind::trace::hd03f93528d46491d
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7f68c8ef2ae5 - std::backtrace_rs::backtrace::trace_unsynchronized::h74dc0b19b052c2ae
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f68c8ef2ae5 - std::sys_common::backtrace::_print_fmt::h9a3bc0e652cf7b69
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f68c8ef2ae5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h4837d7bdd071c26e
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f68c8f4377b - core::fmt::rt::Argument::fmt::h5f4cca7a86de3ac3
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/core/src/fmt/rt.rs:165:63
   5:     0x7f68c8f4377b - core::fmt::write::h58fee7e5e6f828bb
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/core/src/fmt/mod.rs:1168:21
   6:     0x7f68c8ee76bf - std::io::Write::write_fmt::h5a54d56832f12d0f
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/io/mod.rs:1835:15
   7:     0x7f68c8ef28be - std::sys_common::backtrace::_print::hf8a2cb55c2c8353b
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f68c8ef28be - std::sys_common::backtrace::print::h6b23178d2042c60b
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f68c8ef52f9 - std::panicking::default_hook::{{closure}}::h8098cbc85e732f3b
  10:     0x7f68c8ef509c - std::panicking::default_hook::h21b51f336018bc80
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/panicking.rs:292:9
  11:     0x7f68cc2277ff - std[e439e5cd3a449d52]::panicking::update_hook::<alloc[b12fd6abffc16fa6]::boxed::Box<rustc_driver_impl[9892696329624aa2]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f68c8ef5bff - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h5602e10eecbd0618
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/alloc/src/boxed.rs:2076:9
  13:     0x7f68c8ef5bff - std::panicking::rust_panic_with_hook::hd1b3711c6ea634e2
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/panicking.rs:801:13
  14:     0x7f68c8ef57f3 - std::panicking::begin_panic_handler::{{closure}}::h01c1581833053b47
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/panicking.rs:660:13
  15:     0x7f68c8ef2fa9 - std::sys_common::backtrace::__rust_end_short_backtrace::h12d87452272215f0
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f68c8ef54d4 - rust_begin_unwind
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/panicking.rs:658:5
  17:     0x7f68c8f3fd33 - core::panicking::panic_fmt::h219f5a3f16bd9a4d
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/core/src/panicking.rs:74:14
  18:     0x7f68cc03470a - <rustc_borrowck[d08da6903e11d7f3]::type_check::free_region_relations::UniversalRegionRelations>::non_local_upper_bounds
  19:     0x7f68ca6e587d - rustc_borrowck[d08da6903e11d7f3]::nll::compute_regions
  20:     0x7f68ce4f193a - rustc_borrowck[d08da6903e11d7f3]::do_mir_borrowck
  21:     0x7f68ce4e3a3e - rustc_query_impl[8f9eb950d6cc008f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8f9eb950d6cc008f]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>
  22:     0x7f68cd8786ee - rustc_query_system[8ccdec27dd679281]::query::plumbing::try_execute_query::<rustc_query_impl[8f9eb950d6cc008f]::DynamicConfig<rustc_query_system[8ccdec27dd679281]::query::caches::VecCache<rustc_span[7d8a0f37f02bb30e]::def_id::LocalDefId, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[8f9eb950d6cc008f]::plumbing::QueryCtxt, false>
  23:     0x7f68cd87814d - rustc_query_impl[8f9eb950d6cc008f]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  24:     0x7f68cdec2860 - rustc_middle[e07a585f38de947]::query::plumbing::query_get_at::<rustc_query_system[8ccdec27dd679281]::query::caches::VecCache<rustc_span[7d8a0f37f02bb30e]::def_id::LocalDefId, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>>
  25:     0x7f68cdec28ce - <rustc_borrowck[d08da6903e11d7f3]::type_check::TypeChecker>::prove_closure_bounds
  26:     0x7f68cd67659e - <rustc_borrowck[d08da6903e11d7f3]::type_check::TypeChecker>::typeck_mir
  27:     0x7f68ca7165ad - rustc_borrowck[d08da6903e11d7f3]::type_check::type_check
  28:     0x7f68ca6d9ca8 - rustc_borrowck[d08da6903e11d7f3]::nll::compute_regions
  29:     0x7f68ce4f193a - rustc_borrowck[d08da6903e11d7f3]::do_mir_borrowck
  30:     0x7f68ce4e3a3e - rustc_query_impl[8f9eb950d6cc008f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8f9eb950d6cc008f]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>
  31:     0x7f68cd8786ee - rustc_query_system[8ccdec27dd679281]::query::plumbing::try_execute_query::<rustc_query_impl[8f9eb950d6cc008f]::DynamicConfig<rustc_query_system[8ccdec27dd679281]::query::caches::VecCache<rustc_span[7d8a0f37f02bb30e]::def_id::LocalDefId, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[8f9eb950d6cc008f]::plumbing::QueryCtxt, false>
  32:     0x7f68cd87814d - rustc_query_impl[8f9eb950d6cc008f]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7f68cdd5c6c8 - rustc_middle[e07a585f38de947]::query::plumbing::query_get_at::<rustc_query_system[8ccdec27dd679281]::query::caches::VecCache<rustc_span[7d8a0f37f02bb30e]::def_id::LocalDefId, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>>
  34:     0x7f68ce39d38a - rustc_hir_analysis[d86af1a4ad06d506]::collect::type_of::type_of_opaque
  35:     0x7f68ce39d1eb - rustc_query_impl[8f9eb950d6cc008f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8f9eb950d6cc008f]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>
  36:     0x7f68cd624012 - rustc_query_system[8ccdec27dd679281]::query::plumbing::try_execute_query::<rustc_query_impl[8f9eb950d6cc008f]::DynamicConfig<rustc_query_system[8ccdec27dd679281]::query::caches::DefIdCache<rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[8f9eb950d6cc008f]::plumbing::QueryCtxt, false>
  37:     0x7f68ce642036 - rustc_query_impl[8f9eb950d6cc008f]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
  38:     0x7f68cdb1c840 - rustc_middle[e07a585f38de947]::query::plumbing::query_get_at::<rustc_query_system[8ccdec27dd679281]::query::caches::DefIdCache<rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>>
  39:     0x7f68cb0ede8b - rustc_hir_analysis[d86af1a4ad06d506]::collect::type_of::type_of
  40:     0x7f68cd6253ea - rustc_query_impl[8f9eb950d6cc008f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8f9eb950d6cc008f]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>
  41:     0x7f68cd624012 - rustc_query_system[8ccdec27dd679281]::query::plumbing::try_execute_query::<rustc_query_impl[8f9eb950d6cc008f]::DynamicConfig<rustc_query_system[8ccdec27dd679281]::query::caches::DefIdCache<rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[8f9eb950d6cc008f]::plumbing::QueryCtxt, false>
  42:     0x7f68cd623bbb - rustc_query_impl[8f9eb950d6cc008f]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  43:     0x7f68cdb1c840 - rustc_middle[e07a585f38de947]::query::plumbing::query_get_at::<rustc_query_system[8ccdec27dd679281]::query::caches::DefIdCache<rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 8usize]>>>
  44:     0x7f68c9ef6622 - rustc_hir_analysis[d86af1a4ad06d506]::check::check::check_item_type
  45:     0x7f68caf3001c - rustc_hir_analysis[d86af1a4ad06d506]::check::wfcheck::check_well_formed
  46:     0x7f68cd8629fd - rustc_query_impl[8f9eb950d6cc008f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8f9eb950d6cc008f]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 1usize]>>
  47:     0x7f68cd862c6a - rustc_query_system[8ccdec27dd679281]::query::plumbing::try_execute_query::<rustc_query_impl[8f9eb950d6cc008f]::DynamicConfig<rustc_query_system[8ccdec27dd679281]::query::caches::VecCache<rustc_hir[186bee71f654e143]::hir_id::OwnerId, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[8f9eb950d6cc008f]::plumbing::QueryCtxt, false>
  48:     0x7f68cd8629da - rustc_query_impl[8f9eb950d6cc008f]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  49:     0x7f68cd863741 - rustc_hir_analysis[d86af1a4ad06d506]::check::wfcheck::check_mod_type_wf
  50:     0x7f68cd863587 - rustc_query_impl[8f9eb950d6cc008f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8f9eb950d6cc008f]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 1usize]>>
  51:     0x7f68ce010f3a - rustc_query_system[8ccdec27dd679281]::query::plumbing::try_execute_query::<rustc_query_impl[8f9eb950d6cc008f]::DynamicConfig<rustc_query_system[8ccdec27dd679281]::query::caches::DefaultCache<rustc_span[7d8a0f37f02bb30e]::def_id::LocalModDefId, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[8f9eb950d6cc008f]::plumbing::QueryCtxt, false>
  52:     0x7f68ce010cf5 - rustc_query_impl[8f9eb950d6cc008f]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  53:     0x7f68cd8752cc - rustc_hir_analysis[d86af1a4ad06d506]::check_crate
  54:     0x7f68cdf9c947 - rustc_interface[c905b19a64c8fe9a]::passes::analysis
  55:     0x7f68cdf9c487 - rustc_query_impl[8f9eb950d6cc008f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8f9eb950d6cc008f]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 1usize]>>
  56:     0x7f68ce38b2a5 - rustc_query_system[8ccdec27dd679281]::query::plumbing::try_execute_query::<rustc_query_impl[8f9eb950d6cc008f]::DynamicConfig<rustc_query_system[8ccdec27dd679281]::query::caches::SingleCache<rustc_middle[e07a585f38de947]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[8f9eb950d6cc008f]::plumbing::QueryCtxt, false>
  57:     0x7f68ce38b00f - rustc_query_impl[8f9eb950d6cc008f]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  58:     0x7f68ce24f7d2 - rustc_interface[c905b19a64c8fe9a]::interface::run_compiler::<core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>, rustc_driver_impl[9892696329624aa2]::run_compiler::{closure#0}>::{closure#1}
  59:     0x7f68ce2733a7 - std[e439e5cd3a449d52]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[c905b19a64c8fe9a]::util::run_in_thread_with_globals<rustc_interface[c905b19a64c8fe9a]::util::run_in_thread_pool_with_globals<rustc_interface[c905b19a64c8fe9a]::interface::run_compiler<core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>, rustc_driver_impl[9892696329624aa2]::run_compiler::{closure#0}>::{closure#1}, core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>>::{closure#0}, core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>>
  60:     0x7f68ce27316a - <<std[e439e5cd3a449d52]::thread::Builder>::spawn_unchecked_<rustc_interface[c905b19a64c8fe9a]::util::run_in_thread_with_globals<rustc_interface[c905b19a64c8fe9a]::util::run_in_thread_pool_with_globals<rustc_interface[c905b19a64c8fe9a]::interface::run_compiler<core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>, rustc_driver_impl[9892696329624aa2]::run_compiler::{closure#0}>::{closure#1}, core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>>::{closure#0}, core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[bd37ed12c97f867b]::result::Result<(), rustc_span[7d8a0f37f02bb30e]::ErrorGuaranteed>>::{closure#2} as core[bd37ed12c97f867b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  61:     0x7f68c8effa7b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h32b9a9f0c1b7e30b
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/alloc/src/boxed.rs:2062:9
  62:     0x7f68c8effa7b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h33379ef2bcdd46d5
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/alloc/src/boxed.rs:2062:9
  63:     0x7f68c8effa7b - std::sys::pal::unix::thread::Thread::new::thread_start::h27a5de020b7d499b
                               at /rustc/f8e566053207b4ecbcbc7a7d6ded82c43061e3da/library/std/src/sys/pal/unix/thread.rs:108:17
  64:     0x7f68c8e0d609 - start_thread
  65:     0x7f68c8d30353 - clone
  66:                0x0 - <unknown>

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

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: please attach the file at `/playground/rustc-ice-2024-06-15T05_34_50-349.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

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

query stack during panic:
#0 [mir_borrowck] borrow-checking `foo::{closure#0}`
#1 [mir_borrowck] borrow-checking `foo`
end of query stack
note: no errors encountered even though delayed bugs were created

note: those delayed bugs will now be shown as internal compiler errors

error: internal compiler error: {OpaqueTypeKey { def_id: DefId(0:10 ~ playground[642d]::foo::{opaque#0}), args: [T/#0] }: OpaqueTypeDecl { hidden_type: OpaqueHiddenType { span: src/lib.rs:6:5: 6:15 (#0), ty: Closure(DefId(0:9 ~ playground[642d]::foo::{closure#0}), [T/#0, i32, Binder { value: extern "RustCall" fn((&'^0 (),)) -> std::boxed::Box<dyn [Binder { value: Trait(IsStatic), bound_vars: [] }] + '^0, std::alloc::Global>, bound_vars: [Region(BrAnon)] }, (std::boxed::Box<T/#0, std::alloc::Global>,)]) } }}
  |
  = note: delayed at compiler/rustc_infer/src/infer/opaque_types/table.rs:44:43 - disabled backtrace

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 `/playground/rustc-ice-2024-06-15T05_34_50-349.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

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

query stack during panic:
end of query stack
thread 'rustc' panicked at library/core/src/panicking.rs:229:5:
panic in a destructor during cleanup

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

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: please attach the file at `/playground/rustc-ice-2024-06-15T05_34_50-349.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

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

query stack during panic:
end of query stack
thread caused non-unwinding panic. aborting.
error: could not compile `playground` (lib)

Note that the code is invalid, since it should have a T: 'static bound on foo.

Seems identical to the aforementioned #122704 except for having impl instead of dyn