ICE: tried to get type of this RPITIT with no definition

[matthiaskrgr]

Code

#![feature(return_position_impl_trait_in_trait)]

struct Wrapper<G: Send>(T);

trait Foo {
    fn bar() -> Wrapper<impl Sized>;
}

Meta

rustc --version --verbose:

rustc 1.72.0-nightly (7cc3da05f 2023-07-07)
binary: rustc
commit-hash: 7cc3da05f99fbc89782fc6cb7e207fa11aa6add5
commit-date: 2023-07-07
host: x86_64-unknown-linux-gnu
release: 1.72.0-nightly
LLVM version: 16.0.5

Error output

error[E0412]: cannot find type `T` in this scope
 --> treereduce.out:3:25
  |
3 | struct Wrapper<G: Send>(T);
  |                -        ^
  |                |
  |                similarly named type parameter `G` defined here
  |
help: a type parameter with a similar name exists
  |
3 | struct Wrapper<G: Send>(G);
  |                         ~
help: you might be missing a type parameter
  |
3 | struct Wrapper<G: Send, T>(T);
  |                       +++

error[E0601]: `main` function not found in crate `treereduce`
 --> treereduce.out:7:2
  |
7 | }
  |  ^ consider adding a `main` function to `treereduce.out`

Backtrace

error: internal compiler error: compiler/rustc_hir_analysis/src/collect/type_of.rs:449:25: tried to get type of this RPITIT with no definition
 --> treereduce.out:6:25
  |
6 |     fn bar() -> Wrapper<impl Sized>;
  |                         ^^^^^^^^^^

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/compiler/rustc_errors/src/lib.rs:995:33
stack backtrace:
   0:     0x7f0f73763a71 - std::backtrace_rs::backtrace::libunwind::trace::ha9eb60b7e9595e43
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f0f73763a71 - std::backtrace_rs::backtrace::trace_unsynchronized::h4b381e53365308cd
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f0f73763a71 - std::sys_common::backtrace::_print_fmt::h13219a32c4092344
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f0f73763a71 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h37c35e5b57c1a1e8
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f0f737c9d7f - core::fmt::rt::Argument::fmt::h24cb19a613845dee
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/core/src/fmt/rt.rs:138:9
   5:     0x7f0f737c9d7f - core::fmt::write::h62d070c7ceeab948
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f0f737564b7 - std::io::Write::write_fmt::h92df2d506a8d4373
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/io/mod.rs:1714:15
   7:     0x7f0f73763885 - std::sys_common::backtrace::_print::he4455f5d3168b7ed
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f0f73763885 - std::sys_common::backtrace::print::h017586ca1c39223e
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f0f73766663 - std::panicking::default_hook::{{closure}}::h3dc1335f6a07681e
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/panicking.rs:269:22
  10:     0x7f0f737663f4 - std::panicking::default_hook::hc2cfda04971b7526
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/panicking.rs:288:9
  11:     0x7f0f76a5763b - rustc_driver_impl[2c8644295fefa5d3]::install_ice_hook::{closure#0}
  12:     0x7f0f73766e8e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h09569cbca6d2954c
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/alloc/src/boxed.rs:2007:9
  13:     0x7f0f73766e8e - std::panicking::rust_panic_with_hook::h711ce0c3c756b372
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/panicking.rs:709:13
  14:     0x7f0f76b9acd1 - std[b168e09260424fec]::panicking::begin_panic::<rustc_errors[7976e2d93b709148]::ExplicitBug>::{closure#0}
  15:     0x7f0f76b9a3a6 - std[b168e09260424fec]::sys_common::backtrace::__rust_end_short_backtrace::<std[b168e09260424fec]::panicking::begin_panic<rustc_errors[7976e2d93b709148]::ExplicitBug>::{closure#0}, !>
  16:     0x7f0f76b66796 - std[b168e09260424fec]::panicking::begin_panic::<rustc_errors[7976e2d93b709148]::ExplicitBug>
  17:     0x7f0f76ba2ece - <rustc_errors[7976e2d93b709148]::HandlerInner>::span_bug::<rustc_span[33767492b6b5a02]::span_encoding::Span, alloc[ab7c3a594cfea29c]::string::String>
  18:     0x7f0f76ba2d5d - <rustc_errors[7976e2d93b709148]::Handler>::span_bug::<rustc_span[33767492b6b5a02]::span_encoding::Span, alloc[ab7c3a594cfea29c]::string::String>
  19:     0x7f0f76bd1f0d - rustc_middle[552c7c9d188a2017]::util::bug::opt_span_bug_fmt::<rustc_span[33767492b6b5a02]::span_encoding::Span>::{closure#0}
  20:     0x7f0f76bd1f3a - rustc_middle[552c7c9d188a2017]::ty::context::tls::with_opt::<rustc_middle[552c7c9d188a2017]::util::bug::opt_span_bug_fmt<rustc_span[33767492b6b5a02]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f0f76bd0b1a - rustc_middle[552c7c9d188a2017]::ty::context::tls::with_context_opt::<rustc_middle[552c7c9d188a2017]::ty::context::tls::with_opt<rustc_middle[552c7c9d188a2017]::util::bug::opt_span_bug_fmt<rustc_span[33767492b6b5a02]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f0f76bd0984 - rustc_middle[552c7c9d188a2017]::util::bug::span_bug_fmt::<rustc_span[33767492b6b5a02]::span_encoding::Span>
  23:     0x7f0f75bc241b - rustc_hir_analysis[90b95fe540d9f783]::collect::type_of::type_of
  24:     0x7f0f74bb3a03 - rustc_query_impl[da0a9e5c9406df23]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[da0a9e5c9406df23]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 8usize]>>
  25:     0x7f0f74bb39c0 - <rustc_query_impl[da0a9e5c9406df23]::query_impl::type_of::dynamic_query::{closure#2} as core[60225dfec80b3f9a]::ops::function::FnOnce<(rustc_middle[552c7c9d188a2017]::ty::context::TyCtxt, rustc_span[33767492b6b5a02]::def_id::DefId)>>::call_once
  26:     0x7f0f74a78ec5 - rustc_query_system[5ae56448178afbd9]::query::plumbing::try_execute_query::<rustc_query_impl[da0a9e5c9406df23]::DynamicConfig<rustc_query_system[5ae56448178afbd9]::query::caches::DefaultCache<rustc_span[33767492b6b5a02]::def_id::DefId, rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[da0a9e5c9406df23]::plumbing::QueryCtxt, false>
  27:     0x7f0f7639e893 - rustc_query_impl[da0a9e5c9406df23]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  28:     0x7f0f74ce968a - rustc_middle[552c7c9d188a2017]::query::plumbing::query_get_at::<rustc_query_system[5ae56448178afbd9]::query::caches::DefaultCache<rustc_span[33767492b6b5a02]::def_id::DefId, rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 8usize]>>>
  29:     0x7f0f74cd9e14 - <rustc_trait_selection[14451b4dfb15a533]::traits::select::SelectionContext>::select
  30:     0x7f0f74caaf67 - <rustc_trait_selection[14451b4dfb15a533]::traits::fulfill::FulfillProcessor as rustc_data_structures[c1611a994bbf6062]::obligation_forest::ObligationProcessor>::process_obligation
  31:     0x7f0f74ca8174 - <rustc_data_structures[c1611a994bbf6062]::obligation_forest::ObligationForest<rustc_trait_selection[14451b4dfb15a533]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[14451b4dfb15a533]::traits::fulfill::FulfillProcessor>
  32:     0x7f0f757567f0 - <rustc_trait_selection[14451b4dfb15a533]::traits::engine::ObligationCtxt>::assumed_wf_types_and_report_errors
  33:     0x7f0f75750272 - rustc_hir_analysis[90b95fe540d9f783]::check::wfcheck::check_associated_item
  34:     0x7f0f7574b0ec - rustc_hir_analysis[90b95fe540d9f783]::check::wfcheck::check_well_formed
  35:     0x7f0f74a318fc - rustc_query_impl[da0a9e5c9406df23]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[da0a9e5c9406df23]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 0usize]>>
  36:     0x7f0f75282d86 - rustc_query_system[5ae56448178afbd9]::query::plumbing::try_execute_query::<rustc_query_impl[da0a9e5c9406df23]::DynamicConfig<rustc_query_system[5ae56448178afbd9]::query::caches::VecCache<rustc_hir[cca41b40a34d6c6b]::hir_id::OwnerId, rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[da0a9e5c9406df23]::plumbing::QueryCtxt, false>
  37:     0x7f0f75282ad4 - rustc_query_impl[da0a9e5c9406df23]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  38:     0x7f0f75d55d03 - std[b168e09260424fec]::panicking::try::<(), core[60225dfec80b3f9a]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[c1611a994bbf6062]::sync::par_for_each_in<&[rustc_hir[cca41b40a34d6c6b]::hir::ForeignItemId], <rustc_middle[552c7c9d188a2017]::hir::ModuleItems>::par_foreign_items<rustc_hir_analysis[90b95fe540d9f783]::check::wfcheck::check_mod_type_wf::{closure#3}>::{closure#0}>::{closure#0}::{closure#0}>>
  39:     0x7f0f75d55b57 - rustc_data_structures[c1611a994bbf6062]::sync::par_for_each_in::<&[rustc_hir[cca41b40a34d6c6b]::hir::TraitItemId], <rustc_middle[552c7c9d188a2017]::hir::ModuleItems>::par_trait_items<rustc_hir_analysis[90b95fe540d9f783]::check::wfcheck::check_mod_type_wf::{closure#2}>::{closure#0}>
  40:     0x7f0f75d55a66 - rustc_hir_analysis[90b95fe540d9f783]::check::wfcheck::check_mod_type_wf
  41:     0x7f0f7571c8ec - rustc_query_impl[da0a9e5c9406df23]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[da0a9e5c9406df23]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 0usize]>>
  42:     0x7f0f7571c8ce - <rustc_query_impl[da0a9e5c9406df23]::query_impl::check_mod_type_wf::dynamic_query::{closure#2} as core[60225dfec80b3f9a]::ops::function::FnOnce<(rustc_middle[552c7c9d188a2017]::ty::context::TyCtxt, rustc_span[33767492b6b5a02]::def_id::LocalDefId)>>::call_once
  43:     0x7f0f7517263f - rustc_query_system[5ae56448178afbd9]::query::plumbing::try_execute_query::<rustc_query_impl[da0a9e5c9406df23]::DynamicConfig<rustc_query_system[5ae56448178afbd9]::query::caches::VecCache<rustc_span[33767492b6b5a02]::def_id::LocalDefId, rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[da0a9e5c9406df23]::plumbing::QueryCtxt, false>
  44:     0x7f0f76397a84 - rustc_query_impl[da0a9e5c9406df23]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  45:     0x7f0f75e78b85 - std[b168e09260424fec]::panicking::try::<(), core[60225dfec80b3f9a]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[c1611a994bbf6062]::sync::par_for_each_in<&[rustc_hir[cca41b40a34d6c6b]::hir_id::OwnerId], <rustc_middle[552c7c9d188a2017]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[90b95fe540d9f783]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
  46:     0x7f0f75e78aa7 - rustc_data_structures[c1611a994bbf6062]::sync::par_for_each_in::<&[rustc_hir[cca41b40a34d6c6b]::hir_id::OwnerId], <rustc_middle[552c7c9d188a2017]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[90b95fe540d9f783]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>
  47:     0x7f0f75e78877 - <rustc_session[e531b74a05efb0ed]::session::Session>::track_errors::<rustc_hir_analysis[90b95fe540d9f783]::check_crate::{closure#5}, ()>
  48:     0x7f0f75e7671f - rustc_hir_analysis[90b95fe540d9f783]::check_crate
  49:     0x7f0f75e6d7ba - rustc_interface[32a8ee385a384e74]::passes::analysis
  50:     0x7f0f75f098ba - rustc_query_impl[da0a9e5c9406df23]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[da0a9e5c9406df23]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 1usize]>>
  51:     0x7f0f75f098a9 - <rustc_query_impl[da0a9e5c9406df23]::query_impl::analysis::dynamic_query::{closure#2} as core[60225dfec80b3f9a]::ops::function::FnOnce<(rustc_middle[552c7c9d188a2017]::ty::context::TyCtxt, ())>>::call_once
  52:     0x7f0f7608bc28 - rustc_query_system[5ae56448178afbd9]::query::plumbing::try_execute_query::<rustc_query_impl[da0a9e5c9406df23]::DynamicConfig<rustc_query_system[5ae56448178afbd9]::query::caches::SingleCache<rustc_middle[552c7c9d188a2017]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[da0a9e5c9406df23]::plumbing::QueryCtxt, false>
  53:     0x7f0f7608b9f9 - rustc_query_impl[da0a9e5c9406df23]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  54:     0x7f0f75c59325 - <rustc_middle[552c7c9d188a2017]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[2c8644295fefa5d3]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>>
  55:     0x7f0f75c58952 - <rustc_interface[32a8ee385a384e74]::interface::Compiler>::enter::<rustc_driver_impl[2c8644295fefa5d3]::run_compiler::{closure#1}::{closure#2}, core[60225dfec80b3f9a]::result::Result<core[60225dfec80b3f9a]::option::Option<rustc_interface[32a8ee385a384e74]::queries::Linker>, rustc_span[33767492b6b5a02]::ErrorGuaranteed>>
  56:     0x7f0f75c4f665 - rustc_span[33767492b6b5a02]::set_source_map::<core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>, rustc_interface[32a8ee385a384e74]::interface::run_compiler<core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>, rustc_driver_impl[2c8644295fefa5d3]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  57:     0x7f0f75c4f0d6 - <scoped_tls[f7286f318c19c9e0]::ScopedKey<rustc_span[33767492b6b5a02]::SessionGlobals>>::set::<rustc_interface[32a8ee385a384e74]::interface::run_compiler<core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>, rustc_driver_impl[2c8644295fefa5d3]::run_compiler::{closure#1}>::{closure#0}, core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>>
  58:     0x7f0f75c4e69c - std[b168e09260424fec]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[32a8ee385a384e74]::util::run_in_thread_pool_with_globals<rustc_interface[32a8ee385a384e74]::interface::run_compiler<core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>, rustc_driver_impl[2c8644295fefa5d3]::run_compiler::{closure#1}>::{closure#0}, core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>>
  59:     0x7f0f75c4e465 - <<std[b168e09260424fec]::thread::Builder>::spawn_unchecked_<rustc_interface[32a8ee385a384e74]::util::run_in_thread_pool_with_globals<rustc_interface[32a8ee385a384e74]::interface::run_compiler<core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>, rustc_driver_impl[2c8644295fefa5d3]::run_compiler::{closure#1}>::{closure#0}, core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[60225dfec80b3f9a]::result::Result<(), rustc_span[33767492b6b5a02]::ErrorGuaranteed>>::{closure#1} as core[60225dfec80b3f9a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  60:     0x7f0f73771305 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hbcd8640e4284e53b
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/alloc/src/boxed.rs:1993:9
  61:     0x7f0f73771305 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h56beffb9a0c5518d
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/alloc/src/boxed.rs:1993:9
  62:     0x7f0f73771305 - std::sys::unix::thread::Thread::new::thread_start::he7634fd99f9e4d01
                               at /rustc/7cc3da05f99fbc89782fc6cb7e207fa11aa6add5/library/std/src/sys/unix/thread.rs:108:17
  63:     0x7f0f7350444b - <unknown>
  64:     0x7f0f73587e40 - <unknown>
  65:                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 1.72.0-nightly (7cc3da05f 2023-07-07) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [type_of] computing type of `Foo::bar::{opaque#0}`
#1 [check_well_formed] checking that `Foo::bar` is well-formed
#2 [check_mod_type_wf] checking that types are well-formed in top-level module
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0412, E0601.
For more information about an error, try `rustc --explain E0412`.