$ git clone https://github.com/nu11ptr/flexstr.git && cd flexstr $ rustup override set nightly $ rustup show # ... active toolchain ---------------- nightly-x86_64-pc-windows-msvc (directory override for 'C:\Projects\flexstr') rustc 1.81.0-nightly (4bc39f028 2024-06-26) $ cargo build --release # ... 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 `C:\Projects\flexstr\rustc-ice-2024-06-27T09_40_04-37164.txt` to your bug report note: compiler flags: --crate-type lib -C opt-level=3 -C embed-bitcode=no -C strip=debuginfo note: some of the compiler flags provided by cargo are hidden query stack during panic: #0 [evaluate_obligation] evaluating trait selection obligation `[core::mem::maybe_uninit::MaybeUninit<u8>; PAD2]: core::marker::Copy` #1 [is_copy_raw] computing whether `[core::mem::maybe_uninit::MaybeUninit<u8>; PAD2]` is `Copy` end of query stack 

thread 'rustc' panicked at compiler\rustc_middle\src\ty\sty.rs:360:36: called `Option::unwrap()` on a `None` value stack backtrace: 0: 0x7ff97cd4d5a3 - std::backtrace_rs::backtrace::dbghelp64::trace at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\..\..\backtrace\src\backtrace\dbghelp64.rs:91 1: 0x7ff97cd4d5a3 - std::backtrace_rs::backtrace::trace_unsynchronized at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66 2: 0x7ff97cd4d5a3 - std::backtrace::Backtrace::create at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\backtrace.rs:331 3: 0x7ff97cd4d4ea - std::backtrace::Backtrace::force_capture at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\backtrace.rs:312 4: 0x7ff950da0e41 - memchr 5: 0x7ff97cd67207 - alloc::boxed::impl$50::call at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\alloc\src\boxed.rs:2078 6: 0x7ff97cd67207 - std::panicking::rust_panic_with_hook at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\panicking.rs:804 7: 0x7ff97cd66fdf - std::panicking::begin_panic_handler::closure$0 at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\panicking.rs:663 8: 0x7ff97cd644bf - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$> at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\sys\backtrace.rs:171 9: 0x7ff97cd66c76 - std::panicking::begin_panic_handler at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\panicking.rs:661 10: 0x7ff97cdbcbc4 - core::panicking::panic_fmt at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\core\src\panicking.rs:74 11: 0x7ff97cdbcc6d - core::panicking::panic at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\core\src\panicking.rs:148 12: 0x7ff97cdbcb2e - core::option::unwrap_failed at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\core\src\option.rs:2013 13: 0x7ff94f7cff01 - <rustc_middle[d84a46905b9833cf]::ty::sty::ParamConst>::find_ty_from_env 14: 0x7ff9506bd5d7 - <rustc_trait_selection[ce8e559b29610d30]::traits::query::normalize::QueryNormalizer as rustc_type_ir[aefdc4761e7ea19c]::fold::FallibleTypeFolder<rustc_middle[d84a46905b9833cf]::ty::context::TyCtxt>>::try_fold_ty 15: 0x7ff9506bf2fe - <rustc_trait_selection[ce8e559b29610d30]::traits::query::normalize::QueryNormalizer as rustc_type_ir[aefdc4761e7ea19c]::fold::FallibleTypeFolder<rustc_middle[d84a46905b9833cf]::ty::context::TyCtxt>>::try_fold_ty 16: 0x7ff95061084e - <rustc_trait_selection[ce8e559b29610d30]::traits::select::SelectionContext>::evaluate_root_obligation 17: 0x7ff94ff6cd57 - rustc_traits[8fc914267bf48580]::evaluate_obligation::evaluate_obligation 18: 0x7ff95033d43e - rustc_query_impl[16b8175ba1dd8f83]::plumbing::query_key_hash_verify_all 19: 0x7ff95023db0f - rustc_ty_utils[7a4117f0c994b440]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack 20: 0x7ff95034fca0 - rustc_query_impl[16b8175ba1dd8f83]::plumbing::query_key_hash_verify_all 21: 0x7ff95067f7de - <rustc_infer[d17335e7fed5b4ff]::infer::InferCtxt as rustc_trait_selection[ce8e559b29610d30]::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation_no_overflow 22: 0x7ff95062e392 - rustc_trait_selection[ce8e559b29610d30]::traits::type_known_to_meet_bound_modulo_regions 23: 0x7ff9501b822b - rustc_ty_utils[7a4117f0c994b440]::common_traits::is_copy_raw 24: 0x7ff95033c44b - rustc_query_impl[16b8175ba1dd8f83]::plumbing::query_key_hash_verify_all 25: 0x7ff95024b8cc - rustc_ty_utils[7a4117f0c994b440]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack 26: 0x7ff95034bab8 - rustc_query_impl[16b8175ba1dd8f83]::plumbing::query_key_hash_verify_all 27: 0x7ff950bb786b - <rustc_middle[d84a46905b9833cf]::ty::Ty>::is_copy_modulo_regions 28: 0x7ff9501d1cb6 - rustc_ty_utils[7a4117f0c994b440]::needs_drop::needs_drop_raw 29: 0x7ff95033c93b - rustc_query_impl[16b8175ba1dd8f83]::plumbing::query_key_hash_verify_all 30: 0x7ff95024b8b4 - rustc_ty_utils[7a4117f0c994b440]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack 31: 0x7ff95034be93 - rustc_query_impl[16b8175ba1dd8f83]::plumbing::query_key_hash_verify_all 32: 0x7ff94fbe4582 - rustc_hir_analysis[f30f03e5312332c1]::collect::predicates_defined_on 33: 0x7ff94fbd9438 - rustc_hir_analysis[f30f03e5312332c1]::collect::predicates_defined_on 34: 0x7ff94f268549 - <rustc_hir_analysis[f30f03e5312332c1]::variance::variance_of_opaque::{closure#0}::OpaqueTypeLifetimeCollector as rustc_type_ir[aefdc4761e7ea19c]::visit::TypeVisitor<rustc_middle[d84a46905b9833cf]::ty::context::TyCtxt>>::visit_ty 35: 0x7ff94f27ec9e - rustc_mir_transform[3a1eaf4008c3052b]::shim::make_shim 36: 0x7ff94f4af817 - <dyn std[85dfe2848fbb0331]::io::Write as nu_ansi_term[494721e700deaf73]::write::AnyWrite>::write_str 37: 0x7ff94f498cb3 - <dyn std[85dfe2848fbb0331]::io::Write as nu_ansi_term[494721e700deaf73]::write::AnyWrite>::write_str 38: 0x7ff94f401391 - rustc_ty_utils[7a4117f0c994b440]::ty::adt_sized_constraint 39: 0x7ff94f4c2b00 - rustc_query_impl[16b8175ba1dd8f83]::query_system 40: 0x7ff950c68ddc - <rustc_middle[d84a46905b9833cf]::ty::context::TyCtxt>::instance_mir 41: 0x7ff94fc285dd - rustc_mir_transform[3a1eaf4008c3052b]::inline::cycle::mir_inliner_callees 42: 0x7ff94fc26a56 - rustc_mir_transform[3a1eaf4008c3052b]::inline::cycle::mir_inliner_callees 43: 0x7ff94fc26afd - rustc_mir_transform[3a1eaf4008c3052b]::inline::cycle::mir_inliner_callees 44: 0x7ff94f27c780 - <rustc_mir_transform[3a1eaf4008c3052b]::inline::Inline as rustc_middle[d84a46905b9833cf]::mir::MirPass>::run_pass 45: 0x7ff94fbf9cdc - <rustc_mir_transform[3a1eaf4008c3052b]::simplify::SimplifyCfg as rustc_middle[d84a46905b9833cf]::mir::MirPass>::run_pass 46: 0x7ff94fcb6145 - rustc_mir_transform[3a1eaf4008c3052b]::optimized_mir 47: 0x7ff95033c7a0 - rustc_query_impl[16b8175ba1dd8f83]::plumbing::query_key_hash_verify_all 48: 0x7ff95022a81a - rustc_ty_utils[7a4117f0c994b440]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack 49: 0x7ff950342b05 - rustc_query_impl[16b8175ba1dd8f83]::plumbing::query_key_hash_verify_all 50: 0x7ff95203e0f2 - <cc[c04df6f83f42a58f]::AppleOs as core[8b3c6311f9756dee]::fmt::Debug>::fmt 51: 0x7ff9508b6b75 - <rustc_metadata[d6eac6bb222208d8]::rmeta::encoder::EncodeContext as rustc_span[33560a3c1d01ec1a]::SpanEncoder>::encode_symbol 52: 0x7ff94f69ebfa - rustc_metadata[d6eac6bb222208d8]::rmeta::encoder::encode_metadata 53: 0x7ff94f6a6c88 - rustc_metadata[d6eac6bb222208d8]::fs::encode_and_write_metadata 54: 0x7ff94cb0361a - <rustc_interface[7b147ced95828432]::queries::Queries>::codegen_and_build_linker 55: 0x7ff94cab5c8b - _LNan_C 56: 0x7ff94cab1c0f - _LNan_C 57: 0x7ff94cabb239 - _LNan_C 58: 0x7ff97cd7815d - alloc::boxed::impl$48::call_once at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\alloc\src\boxed.rs:2064 59: 0x7ff97cd7815d - alloc::boxed::impl$48::call_once at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\alloc\src\boxed.rs:2064 60: 0x7ff97cd7815d - std::sys::pal::windows::thread::impl$0::new::thread_start at /rustc/4bc39f028d14c24b04dd17dc425432c6ec354536/library\std\src\sys\pal\windows\thread.rs:52 61: 0x7ffa1779257d - BaseThreadInitThunk 62: 0x7ffa1888af28 - RtlUserThreadStart rustc version: 1.81.0-nightly (4bc39f028 2024-06-26) platform: x86_64-pc-windows-msvc query stack during panic: #0 [evaluate_obligation] evaluating trait selection obligation `[core::mem::maybe_uninit::MaybeUninit<u8>; PAD2]: core::marker::Copy` #1 [is_copy_raw] computing whether `[core::mem::maybe_uninit::MaybeUninit<u8>; PAD2]` is `Copy` #2 [needs_drop_raw] computing whether `[core::mem::maybe_uninit::MaybeUninit<u8>; PAD2]` needs drop #3 [mir_shims] generating MIR shim for `core::ptr::drop_in_place` #4 [optimized_mir] optimizing MIR for `<impl at flexstr\src\lib.rs:207:1: 208:40>::drop` end of query stack