ICE: RegionKind::ReError constructed but no error reported

[saethlin]

Possibly related to #107988 ?

Code

cargo +nightly test in chwp v1.183.0
The error message is in building assertor v0.0.1 but I can't reproduce with just building that crate, which is odd.

Meta

rustc --version --verbose:

rustc 1.69.0-nightly (9a7cc6c32 2023-02-16)
binary: rustc
commit-hash: 9a7cc6c32f1a690f86827e4724bcda85e506ef35
commit-date: 2023-02-16
host: x86_64-unknown-linux-gnu
release: 1.69.0-nightly
LLVM version: 15.0.7

Error output

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: RegionKind::ReError constructed but no error reported

Backtrace

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: RegionKind::ReError constructed but no error reported
  |
  = note: delayed at    0: <rustc_errors::HandlerInner>::emit_diagnostic
             1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, &str>
             2: <rustc_middle::ty::context::TyCtxt>::mk_re_error_misc
             3: rustc_infer::infer::lexical_region_resolve::resolve
             4: <rustc_infer::infer::InferCtxt>::resolve_regions
             5: rustc_hir_analysis::check::compare_impl_item::compare_method_predicate_entailment
             6: rustc_hir_analysis::check::compare_impl_item::compare_impl_method
             7: rustc_hir_analysis::check::check::check_mod_item_types
             8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::check_mod_item_types, rustc_query_impl::plumbing::QueryCtxt>
             9: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::check_mod_item_types
            10: <rustc_middle::hir::map::Map>::for_each_module::<rustc_hir_analysis::check_crate::{closure#6}::{closure#0}>
            11: rustc_hir_analysis::check_crate
            12: rustc_interface::passes::analysis
            13: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
            14: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
            15: <rustc_interface::queries::QueryResult<&rustc_middle::ty::context::GlobalCtxt>>::enter::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#3}>
            16: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorGuaranteed>>
            17: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
            18: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            19: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            20: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            21: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/9a7cc6c32f1a690f86827e4724bcda85e506ef35/library/alloc/src/boxed.rs:1988:9
            22: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/9a7cc6c32f1a690f86827e4724bcda85e506ef35/library/alloc/src/boxed.rs:1988:9
            23: std::sys::unix::thread::Thread::new::thread_start
                       at /rustc/9a7cc6c32f1a690f86827e4724bcda85e506ef35/library/std/src/sys/unix/thread.rs:108:17
            24: <unknown>
            25: <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 1.69.0-nightly (9a7cc6c32 2023-02-16) running on x86_64-unknown-linux-gnu

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

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

query stack during panic:
end of query stack
error: could not compile `assertor`; 1 warning emitted
warning: build failed, waiting for other jobs to finish...

[saethlin]

@rustbot label +E-needs-mcve

[compiler-errors]

I'm pretty sure I know how to make an MCVE for this.

@rustbot claim

[compiler-errors]

Ah, lol, it's because google/assertor#1 hasn't landed, and a recent ReError PR made it delay a bug that should've been handled more gracefully.

The error message is in building assertor v0.0.1 but I can't reproduce with just building that crate, which is odd.

If you build assertor with -Aimplied_bounds_entailment (or add #![allow(implied_bounds_entailment)]) then it ICEs similarly.