Broken MIR Compiler bug

[ActuallyHappening]

I am very much enjoying programming in Rust! However, upon upgrading to stable 1.74 using bevy, I came across a strange compiler bug.

Code

// literally nothing, in src/lib.rs

Cargo.toml:

[package]
name = "creativity-game"
version = "0.0.0"
edition = "2021"

# Enable a small amount of optimization in debug mode
[profile.dev]
opt-level = 1

# Enable high optimizations for dependencies (incl. Bevy), but not for our code:
[profile.dev.package."*"]
opt-level = 3

[dependencies.bevy_editor_pls]
# git = "https://github.com/jakobhellermann/bevy_editor_pls.git"
version = "0.6"
features = ["default_windows"]

I ran cargo b with no rust-toolchain.toml file

Meta

rustc --version --verbose:

binary: rustc
commit-hash: 79e9716c980570bfd1f666e3b16ac583f0168962
commit-date: 2023-11-13
host: aarch64-apple-darwin
release: 1.74.0
LLVM version: 17.0.4

This doesn't compile on the stable 1.74 channel, cargo +stable b, but compiles fine on nightly:

rustc 1.75.0-nightly (31bc7e2c4 2023-10-30)
binary: rustc
commit-hash: 31bc7e2c47e82798a392c770611975a6883132c8
commit-date: 2023-10-30
host: aarch64-apple-darwin
release: 1.75.0-nightly
LLVM version: 17.0.3

Also, it compiles fine on previous 1.73 stable version, making this a regression:

rustc 1.73.0 (cc66ad468 2023-10-03)
binary: rustc
commit-hash: cc66ad468955717ab92600c770da8c1601a4ff33
commit-date: 2023-10-03
host: aarch64-apple-darwin
release: 1.73.0
LLVM version: 17.0.2

Error output

(see backtrace below)

Backtrace

(on shell after having unsuccessfully built it after cargo clean)> RUST_BACKTRACE=1 cargo b
   Compiling bevy-inspector-egui v0.21.0
   Compiling bevy_editor_pls_core v0.6.0
   Compiling bevy_editor_pls_default_windows v0.6.0
   Compiling bevy_editor_pls v0.6.0
   Compiling creativity-game v0.0.0 (/Users/ah/Desktop/testing-bug)
error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: broken MIR in Item(DefId(0:154 ~ bevy_inspector_egui[3cc2]::bevy_inspector::ui_for_entity_components::{closure#3})) (after phase change to runtime-optimized) at bb5[4]:
                                Alias(Opaque, AliasTy { args: [ReErased, ReErased], def_id: DefId(0:2228 ~ bevy_inspector_egui[3cc2]::restricted_world_view::{impl#3}::get_entity_component_reflect::{opaque#0}) }) does not have fields
   --> /Users/ah/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bevy-inspector-egui-0.21.0/src/bevy_inspector/mod.rs:415:17
    |
415 |                 set_changed();
    |                 ^^^^^^^^^^^
    |
note: delayed at compiler/rustc_const_eval/src/transform/validate.rs:94:25
         0: std::backtrace::Backtrace::create
         1: <rustc_errors::HandlerInner>::emit_diagnostic
         2: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
         3: <rustc_const_eval::transform::validate::CfgChecker>::fail::<alloc::string::String>
         4: <rustc_const_eval::transform::validate::Validator as rustc_middle::mir::MirPass>::run_pass
         5: rustc_mir_transform::pass_manager::run_passes_inner
         6: rustc_mir_transform::optimized_mir
         7: 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]>>
         8: <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
         9: 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>
        10: rustc_query_impl::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
        11: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 8]>>>
        12: <rustc_middle::ty::context::TyCtxt>::instance_mir
        13: rustc_monomorphize::collector::collect_used_items
        14: rustc_monomorphize::collector::collect_items_rec
        15: rustc_monomorphize::collector::collect_items_rec
        16: rustc_monomorphize::collector::collect_items_rec
        17: rustc_monomorphize::collector::collect_items_rec
        18: rustc_monomorphize::collector::collect_items_rec
        19: rustc_monomorphize::collector::collect_items_rec
        20: rustc_monomorphize::collector::collect_items_rec
        21: rustc_monomorphize::collector::collect_items_rec
        22: rustc_monomorphize::collector::collect_items_rec
        23: rustc_monomorphize::collector::collect_items_rec
        24: rustc_monomorphize::collector::collect_items_rec
        25: rustc_monomorphize::collector::collect_items_rec
        26: rustc_monomorphize::collector::collect_items_rec
        27: rustc_monomorphize::collector::collect_items_rec
        28: <core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::parallel::disabled::par_for_each_in<alloc::vec::Vec<rustc_middle::mir::mono::MonoItem>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}> as core::ops::function::FnOnce<()>>::call_once
        29: rustc_data_structures::sync::parallel::disabled::par_for_each_in::<alloc::vec::Vec<rustc_middle::mir::mono::MonoItem>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure#0}>
        30: <rustc_session::session::Session>::time::<(), rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}>
        31: rustc_monomorphize::collector::collect_crate_mono_items
        32: rustc_monomorphize::partitioning::collect_and_partition_mono_items
        33: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 24]>>
        34: <rustc_query_impl::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
        35: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        36: rustc_query_impl::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
        37: rustc_codegen_ssa::base::codegen_crate::<rustc_codegen_llvm::LlvmCodegenBackend>
        38: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
        39: <rustc_session::session::Session>::time::<alloc::boxed::Box<dyn core::any::Any>, rustc_interface::passes::start_codegen::{closure#0}>
        40: rustc_interface::passes::start_codegen
        41: <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>>
        42: <rustc_interface::queries::Queries>::ongoing_codegen
        43: 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_compiler::{closure#1}>::{closure#0}::{closure#0}>
        44: 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>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        45: <<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::run_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}
        46: std::sys::unix::thread::Thread::new::thread_start
        47: __pthread_joiner_wake
   --> /Users/ah/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bevy-inspector-egui-0.21.0/src/bevy_inspector/mod.rs:415:17
    |
415 |                 set_changed();
    |                 ^^^^^^^^^^^

error: internal compiler error: broken MIR in Item(DefId(0:154 ~ bevy_inspector_egui[3cc2]::bevy_inspector::ui_for_entity_components::{closure#3})) (after phase change to runtime-optimized) at bb5[5]:
                                Alias(Opaque, AliasTy { args: [ReErased, ReErased], def_id: DefId(0:2228 ~ bevy_inspector_egui[3cc2]::restricted_world_view::{impl#3}::get_entity_component_reflect::{opaque#0}) }) does not have fields
   --> /Users/ah/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bevy-inspector-egui-0.21.0/src/bevy_inspector/mod.rs:415:17
    |
415 |                 set_changed();
    |                 ^^^^^^^^^^^
    |
note: delayed at compiler/rustc_const_eval/src/transform/validate.rs:94:25
         0: std::backtrace::Backtrace::create
         1: <rustc_errors::HandlerInner>::emit_diagnostic
         2: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
         3: <rustc_const_eval::transform::validate::CfgChecker>::fail::<alloc::string::String>
         4: <rustc_const_eval::transform::validate::Validator as rustc_middle::mir::MirPass>::run_pass
         5: rustc_mir_transform::pass_manager::run_passes_inner
         6: rustc_mir_transform::optimized_mir
         7: 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]>>
         8: <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
         9: 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>
        10: rustc_query_impl::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
        11: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::DefId, rustc_middle::query::erase::Erased<[u8; 8]>>>
        12: <rustc_middle::ty::context::TyCtxt>::instance_mir
        13: rustc_monomorphize::collector::collect_used_items
        14: rustc_monomorphize::collector::collect_items_rec
        15: rustc_monomorphize::collector::collect_items_rec
        16: rustc_monomorphize::collector::collect_items_rec
        17: rustc_monomorphize::collector::collect_items_rec
        18: rustc_monomorphize::collector::collect_items_rec
        19: rustc_monomorphize::collector::collect_items_rec
        20: rustc_monomorphize::collector::collect_items_rec
        21: rustc_monomorphize::collector::collect_items_rec
        22: rustc_monomorphize::collector::collect_items_rec
        23: rustc_monomorphize::collector::collect_items_rec
        24: rustc_monomorphize::collector::collect_items_rec
        25: rustc_monomorphize::collector::collect_items_rec
        26: rustc_monomorphize::collector::collect_items_rec
        27: rustc_monomorphize::collector::collect_items_rec
        28: <core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::parallel::disabled::par_for_each_in<alloc::vec::Vec<rustc_middle::mir::mono::MonoItem>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}> as core::ops::function::FnOnce<()>>::call_once
        29: rustc_data_structures::sync::parallel::disabled::par_for_each_in::<alloc::vec::Vec<rustc_middle::mir::mono::MonoItem>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure#0}>
        30: <rustc_session::session::Session>::time::<(), rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}>
        31: rustc_monomorphize::collector::collect_crate_mono_items
        32: rustc_monomorphize::partitioning::collect_and_partition_mono_items
        33: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 24]>>
        34: <rustc_query_impl::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
        35: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        36: rustc_query_impl::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
        37: rustc_codegen_ssa::base::codegen_crate::<rustc_codegen_llvm::LlvmCodegenBackend>
        38: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
        39: <rustc_session::session::Session>::time::<alloc::boxed::Box<dyn core::any::Any>, rustc_interface::passes::start_codegen::{closure#0}>
        40: rustc_interface::passes::start_codegen
        41: <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>>
        42: <rustc_interface::queries::Queries>::ongoing_codegen
        43: 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_compiler::{closure#1}>::{closure#0}::{closure#0}>
        44: 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>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        45: <<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::run_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}
        46: std::sys::unix::thread::Thread::new::thread_start
        47: __pthread_joiner_wake
   --> /Users/ah/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bevy-inspector-egui-0.21.0/src/bevy_inspector/mod.rs:415:17
    |
415 |                 set_changed();
    |                 ^^^^^^^^^^^

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 aarch64-apple-darwin

note: compiler flags: --crate-type lib -C opt-level=3 -C embed-bitcode=no -C debuginfo=2 -C split-debuginfo=unpacked -C debug-assertions=on

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

query stack during panic:
end of query stack
error: could not compile `bevy-inspector-egui` (lib)
warning: build failed, waiting for other jobs to finish...

[saethlin]

I'm closing this as a direct duplicate of #118025 but still thank you for reporting this. I'd rather see us close the occasional duplicate than have people not speak up when they have a problem.

[ActuallyHappening]

Oh thanks, yes I agree I will still report bugs but didn't see mine was duplicate