broken MIR in tantivy

[ahcm]

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

error: internal compiler error: broken MIR in Item(DefId(0:7908 ~ tantivy[1de3]::store::reader::{impl#3}::iter_raw::{closure#2})) (after phase change to runtime-optimized) at bb2[6]:
                                Alias(Opaque, AliasTy { args: [ReErased], def_id: DefId(0:18076 ~ tantivy[1de3]::store::reader::{impl#3}::block_checkpoints::{opaque#0}) }) does not have fields
 --> /rustc/79e9716c980570bfd1f666e3b16ac583f0168962/library/core/src/iter/adapters/flatten.rs:52:9
  |
note: delayed at compiler/rustc_const_eval/src/transform/validate.rs:94:25
         0: <rustc_errors::HandlerInner>::emit_diagnostic
         1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
         2: <rustc_const_eval::transform::validate::CfgChecker>::fail::<alloc::string::String>
         3: <rustc_const_eval::transform::validate::Validator as rustc_middle::mir::MirPass>::run_pass
         4: rustc_mir_transform::pass_manager::run_passes
         5: rustc_mir_transform::optimized_mir
         6: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
         7: <rustc_query_impl::query_impl::optimized_mir::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::DefId)>>::call_once
         8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 8]>>,
 false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         9: rustc_query_impl::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
        10: <rustc_metadata::rmeta::encoder::EncodeContext>::encode_crate_root
        11: rustc_metadata::rmeta::encoder::encode_metadata_impl
        12: rustc_data_structures::sync::parallel::disabled::join::<rustc_metadata::rmeta::encoder::encode_metadata::{closure#0}, rustc_metadata::rmeta::encoder::encode_metadata::{closure#1}, (), ()>
        13: rustc_metadata::rmeta::encoder::encode_metadata
        14: rustc_metadata::fs::encode_and_write_metadata
        15: rustc_interface::passes::start_codegen
        16: <rustc_middle::ty::context::GlobalCtxt>::enter::<<rustc_interface::queries::Queries>::ongoing_codegen::{closure#0}, core::result::Result<alloc::boxed::Box<dyn core::any::Any>, rustc_span::ErrorGuaranteed>>
        17: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compil
er::{closure#1}>::{closure#0}::{closure#0}>
        18: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rust
c_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        19: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::ru
n_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<(
)>>::call_once::{shim:vtable#0}
        20: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/79e9716c980570bfd1f666e3b16ac583f0168962/library/alloc/src/boxed.rs:2007:9
        21: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/79e9716c980570bfd1f666e3b16ac583f0168962/library/alloc/src/boxed.rs:2007:9
        22: std::sys::unix::thread::Thread::new::thread_start
                   at /rustc/79e9716c980570bfd1f666e3b16ac583f0168962/library/std/src/sys/unix/thread.rs:108:17
        23: start_thread
                   at ./nptl/pthread_create.c:442:8
        24: __GI___clone3
                   at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
 --> /rustc/79e9716c980570bfd1f666e3b16ac583f0168962/library/core/src/iter/adapters/flatten.rs:52:9

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 1.74.0 (79e9716c9 2023-11-13) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C opt-level=3 -C embed-bitcode=no

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

query stack during panic:
end of query stack
error: could not compile `tantivy` (lib)

[lqd]

Thanks for opening an issue! This is a duplicate of #117976, so I'll close this one as such. This problem is already fixed on beta and nightly, and should also be fixed on stable when/if a future backport of #116415 happens.