ICE. `!base.layout().is_sized()`

[matthiaskrgr]

auto-reduced (treereduce-rust):

pub trait TestTrait {
    type MyType;
    fn func() -> Option<Self>
    where
        Self: Sized;
}

impl<T> dyn TestTrait<MyType = T>
where
    Self: Sized,
{
    pub fn other_func() -> Option<Self> {
        match Self::func() {
            Some(me) => Some(me),
            None => None,
        }
    }
}

original:

//@ compile-flags: --crate-type=lib -Zmir-opt-level=2
//@ build-pass
// ^-- Must be build-pass, because check-pass will not run const prop.

pub trait TestTrait {
    type MyType;
    fn func() -> Option<Self>
    where
        Self: Sized;
}

impl<T> dyn TestTrait<MyType = T>
where
    Self: Sized,
{
    pub fn other_func() -> Option<Self> {
        match Self::func() {
            Some(me) => Some(me),
            None => None,
        }
    }
}

Version information

rustc 1.81.0-nightly (f8e4ac076 2024-07-14)
binary: rustc
commit-hash: f8e4ac0760216724f69b1ebc369bf03da56a7520
commit-date: 2024-07-14
host: x86_64-unknown-linux-gnu
release: 1.81.0-nightly
LLVM version: 18.1.7

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zmir-opt-level=5 --crate-type=lib

Program output

thread 'rustc' panicked at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/compiler/rustc_const_eval/src/interpret/projection.rs:166:13:
assertion failed: !base.layout().is_sized()
stack backtrace:
   0:     0x723ebf105865 - std::backtrace_rs::backtrace::libunwind::trace::hd38d957c3cc252d2
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x723ebf105865 - std::backtrace_rs::backtrace::trace_unsynchronized::h1872a55102afa6eb
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x723ebf105865 - std::sys::backtrace::_print_fmt::h20dc7ce96546708c
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/sys/backtrace.rs:65:5
   3:     0x723ebf105865 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hc05f0077a6d9d85d
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/sys/backtrace.rs:40:26
   4:     0x723ebf1550eb - core::fmt::rt::Argument::fmt::hc83d8497f7eca888
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/core/src/fmt/rt.rs:173:76
   5:     0x723ebf1550eb - core::fmt::write::h018b5020a31eaee4
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/core/src/fmt/mod.rs:1182:21
   6:     0x723ebf0fa3cf - std::io::Write::write_fmt::ha03f1960d314b86c
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/io/mod.rs:1827:15
   7:     0x723ebf108051 - std::sys::backtrace::BacktraceLock::print::hb613464fb9731709
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/sys/backtrace.rs:43:9
   8:     0x723ebf108051 - std::panicking::default_hook::{{closure}}::h535fcea069b87644
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/panicking.rs:269:22
   9:     0x723ebf107d2c - std::panicking::default_hook::h8a985a1bbf049349
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/panicking.rs:296:9
  10:     0x723ebb5ec589 - std[7a47f84281342453]::panicking::update_hook::<alloc[b164795f67c102d1]::boxed::Box<rustc_driver_impl[a19efe568a6a6683]::install_ice_hook::{closure#0}>>::{closure#0}
  11:     0x723ebf108a1f - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0580c9dd81c802de
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/alloc/src/boxed.rs:2084:9
  12:     0x723ebf108a1f - std::panicking::rust_panic_with_hook::hdb4c410c90ba309a
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/panicking.rs:808:13
  13:     0x723ebf108613 - std::panicking::begin_panic_handler::{{closure}}::hd6b26adc9172d33b
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/panicking.rs:667:13
  14:     0x723ebf105d29 - std::sys::backtrace::__rust_end_short_backtrace::h3a27e3f65f32503b
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/sys/backtrace.rs:168:18
  15:     0x723ebf1082d4 - rust_begin_unwind
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/panicking.rs:665:5
  16:     0x723ebf1516a3 - core::panicking::panic_fmt::ha0ad70cf2f26aad8
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/core/src/panicking.rs:74:14
  17:     0x723ebf15172c - core::panicking::panic::h6e669894f5b53db5
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/core/src/panicking.rs:148:5
  18:     0x723ebe4411b7 - <rustc_const_eval[fd17e0cfdd0bd9e3]::interpret::eval_context::InterpCx<rustc_const_eval[fd17e0cfdd0bd9e3]::const_eval::dummy_machine::DummyMachine>>::project_field::<rustc_const_eval[fd17e0cfdd0bd9e3]::interpret::operand::OpTy>.cold
  19:     0x723ebbe1e851 - <rustc_mir_transform[a9e991cd80486376]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#0}
  20:     0x723ebbd479eb - <rustc_mir_dataflow[538483daff6f33a9]::value_analysis::Map>::for_each_projection_value::<rustc_const_eval[fd17e0cfdd0bd9e3]::interpret::operand::OpTy, <rustc_mir_transform[a9e991cd80486376]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#0}, <rustc_mir_transform[a9e991cd80486376]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#1}>
  21:     0x723ebbd47a6c - <rustc_mir_dataflow[538483daff6f33a9]::value_analysis::Map>::for_each_projection_value::<rustc_const_eval[fd17e0cfdd0bd9e3]::interpret::operand::OpTy, <rustc_mir_transform[a9e991cd80486376]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#0}, <rustc_mir_transform[a9e991cd80486376]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#1}>
  22:     0x723ebbe1e806 - <rustc_mir_transform[a9e991cd80486376]::dataflow_const_prop::ConstAnalysis>::assign_constant
  23:     0x723ebbdd6ba0 - <rustc_mir_transform[a9e991cd80486376]::dataflow_const_prop::ConstAnalysis>::assign_operand
  24:     0x723ebbe1cc4d - <rustc_mir_transform[a9e991cd80486376]::dataflow_const_prop::DataflowConstProp as rustc_middle[b63224948423896b]::mir::MirPass>::run_pass
  25:     0x723ebcc01cbb - rustc_mir_transform[a9e991cd80486376]::pass_manager::run_passes_inner
  26:     0x723ebd15eed6 - rustc_mir_transform[a9e991cd80486376]::optimized_mir
  27:     0x723ebdaab21b - rustc_query_impl[a0d93f3a76d1e236]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a0d93f3a76d1e236]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b63224948423896b]::query::erase::Erased<[u8; 8usize]>>
  28:     0x723ebced50e3 - rustc_query_system[967e3c5480e09d8a]::query::plumbing::try_execute_query::<rustc_query_impl[a0d93f3a76d1e236]::DynamicConfig<rustc_query_system[967e3c5480e09d8a]::query::caches::DefIdCache<rustc_middle[b63224948423896b]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a0d93f3a76d1e236]::plumbing::QueryCtxt, false>
  29:     0x723ebced48e0 - rustc_query_impl[a0d93f3a76d1e236]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  30:     0x723ebd3f4023 - rustc_middle[b63224948423896b]::query::plumbing::query_get_at::<rustc_query_system[967e3c5480e09d8a]::query::caches::DefIdCache<rustc_middle[b63224948423896b]::query::erase::Erased<[u8; 8usize]>>>
  31:     0x723ebd3f9aa1 - <rustc_metadata[e0a5a3ee2c4f394f]::rmeta::encoder::EncodeContext>::encode_crate_root
  32:     0x723ebdc7e31e - rustc_metadata[e0a5a3ee2c4f394f]::rmeta::encoder::encode_metadata
  33:     0x723ebdc7c3f4 - rustc_metadata[e0a5a3ee2c4f394f]::fs::encode_and_write_metadata
  34:     0x723ebdc7b083 - <rustc_interface[f891d35c33df0120]::queries::Linker>::codegen_and_build_linker
  35:     0x723ebd9c0676 - rustc_interface[f891d35c33df0120]::interface::run_compiler::<core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>, rustc_driver_impl[a19efe568a6a6683]::run_compiler::{closure#0}>::{closure#1}
  36:     0x723ebd99cc09 - std[7a47f84281342453]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[f891d35c33df0120]::util::run_in_thread_with_globals<rustc_interface[f891d35c33df0120]::util::run_in_thread_pool_with_globals<rustc_interface[f891d35c33df0120]::interface::run_compiler<core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>, rustc_driver_impl[a19efe568a6a6683]::run_compiler::{closure#0}>::{closure#1}, core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>>::{closure#0}, core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>>
  37:     0x723ebd99c9ba - <<std[7a47f84281342453]::thread::Builder>::spawn_unchecked_<rustc_interface[f891d35c33df0120]::util::run_in_thread_with_globals<rustc_interface[f891d35c33df0120]::util::run_in_thread_pool_with_globals<rustc_interface[f891d35c33df0120]::interface::run_compiler<core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>, rustc_driver_impl[a19efe568a6a6683]::run_compiler::{closure#0}>::{closure#1}, core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>>::{closure#0}, core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5c27b473aec29ed1]::result::Result<(), rustc_span[8a5224f023f17529]::ErrorGuaranteed>>::{closure#2} as core[5c27b473aec29ed1]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  38:     0x723ebf1128cb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf9b8e00cff207f55
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/alloc/src/boxed.rs:2070:9
  39:     0x723ebf1128cb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd33bea353aae3a46
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/alloc/src/boxed.rs:2070:9
  40:     0x723ebf1128cb - std::sys::pal::unix::thread::Thread::new::thread_start::hb95383f957b5020b
                               at /rustc/f8e4ac0760216724f69b1ebc369bf03da56a7520/library/std/src/sys/pal/unix/thread.rs:108:17
  41:     0x723eb80a6ded - <unknown>
  42:     0x723eb812a0dc - <unknown>
  43:                0x0 - <unknown>

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: rustc 1.81.0-nightly (f8e4ac076 2024-07-14) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z mir-opt-level=5 --crate-type lib -Z dump-mir-dir=dir

query stack during panic:
#0 [optimized_mir] optimizing MIR for `<impl at /tmp/icemaker_global_tempdir.4HXXv5pAmPjZ/rustc_testrunner_tmpdir_reporting.8X4UesCacdRf/mvce.rs:8:1: 10:17>::other_func`
end of query stack

[matthiaskrgr]

#127087 cc @cjgillot