ICE: SizeSkeleton::compute layout errored in layout.rs

[langston-barrett]

This is a fuzzed test case, found with tree-splicer and minimized with treereduce. I hope it's valid, please let me know (and many apologies) if it's not helpful! I searched the issue tracker like so, but found no similar issues.

Code

struct Foo(Option<Box<Fn(&EContext)>>);
const TRANSMUTED_U32: u32 = { std::mem::transmute(Foo(582)) };

Meta

rustc --version --verbose:

rustc 1.70.0-nightly (7b4f48927 2023-03-12)
binary: rustc
commit-hash: 7b4f48927dce585f747a58083b45ab62b9d73a53
commit-date: 2023-03-12
host: x86_64-unknown-linux-gnu
release: 1.70.0-nightly
LLVM version: 15.0.7

Error output

Backtrace

error[E0412]: cannot find type `EContext` in this scope
 --> ice_min.rs:1:27
  |
1 | struct Foo(Option<Box<Fn(&EContext)>>);
  |                           ^^^^^^^^ not found in this scope
  |
help: you might be missing a type parameter
  |
1 | struct Foo<EContext>(Option<Box<Fn(&EContext)>>);
  |           ++++++++++

warning: unnecessary braces around assigned value
 --> ice_min.rs:2:29
  |
2 | const TRANSMUTED_U32: u32 = { std::mem::transmute(Foo(582)) };
  |                             ^^                             ^^
  |
  = note: `#[warn(unused_braces)]` on by default
help: remove these braces
  |
2 - const TRANSMUTED_U32: u32 = { std::mem::transmute(Foo(582)) };
2 + const TRANSMUTED_U32: u32 = std::mem::transmute(Foo(582));
  |

error[E0601]: `main` function not found in crate `ice_min`
 --> ice_min.rs:2:63
  |
2 | const TRANSMUTED_U32: u32 = { std::mem::transmute(Foo(582)) };
  |                                                               ^ consider adding a `main` function to `ice_min.rs`

warning: trait objects without an explicit `dyn` are deprecated
 --> ice_min.rs:1:23
  |
1 | struct Foo(Option<Box<Fn(&EContext)>>);
  |                       ^^^^^^^^^^^^^
  |
  = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
  = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
  = note: `#[warn(bare_trait_objects)]` on by default
help: use `dyn`
  |
1 | struct Foo(Option<Box<dyn Fn(&EContext)>>);
  |                       +++

error: internal compiler error: compiler/rustc_middle/src/ty/layout.rs:320:26: SizeSkeleton::compute(*const (dyn for<'a> Fn(&'a [type error]) + 'static)): layout errored (the type `[type error]` has an unknown layout), yet tail `(dyn for<'a> Fn(&'a [type error]) + 'static)` is not a type parameter or a projection

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/compiler/rustc_errors/src/lib.rs:1644:9
stack backtrace:
   0:     0x7f1b5ec5d51a - std::backtrace_rs::backtrace::libunwind::trace::hf7d75cca16fd1b61
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f1b5ec5d51a - std::backtrace_rs::backtrace::trace_unsynchronized::hf5ec95734aab509d
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f1b5ec5d51a - std::sys_common::backtrace::_print_fmt::he95113413355c8cd
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f1b5ec5d51a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h072d12f2e69ca92b
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f1b5ecc0c5e - core::fmt::write::h1d23f16415e96af2
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/core/src/fmt/mod.rs:1232:17
   5:     0x7f1b5ec50275 - std::io::Write::write_fmt::hcf1e413fde4ffcd5
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/io/mod.rs:1684:15
   6:     0x7f1b5ec5d2e5 - std::sys_common::backtrace::_print::h6b2b14bedd5177e7
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f1b5ec5d2e5 - std::sys_common::backtrace::print::h09ccebfbcd382e89
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f1b5ec6005f - std::panicking::default_hook::{{closure}}::h4ee055db778febc2
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/panicking.rs:271:22
   9:     0x7f1b5ec5fd9b - std::panicking::default_hook::ha74f60e3a15d95fb
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/panicking.rs:290:9
  10:     0x7f1b61fdf085 - rustc_driver_impl[d355a67661263e47]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f1b5ec6089d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7f34603beb945e8f
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/alloc/src/boxed.rs:2002:9
  12:     0x7f1b5ec6089d - std::panicking::rust_panic_with_hook::h4b5d379936d4932f
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/panicking.rs:696:13
  13:     0x7f1b6254a371 - std[e52d7c968ed01318]::panicking::begin_panic::<rustc_errors[45159b7f7e36021d]::ExplicitBug>::{closure#0}
  14:     0x7f1b62545aa6 - std[e52d7c968ed01318]::sys_common::backtrace::__rust_end_short_backtrace::<std[e52d7c968ed01318]::panicking::begin_panic<rustc_errors[45159b7f7e36021d]::ExplicitBug>::{closure#0}, !>
  15:     0x7f1b625ce046 - std[e52d7c968ed01318]::panicking::begin_panic::<rustc_errors[45159b7f7e36021d]::ExplicitBug>
  16:     0x7f1b62599e06 - std[e52d7c968ed01318]::panic::panic_any::<rustc_errors[45159b7f7e36021d]::ExplicitBug>
  17:     0x7f1b62595966 - <rustc_errors[45159b7f7e36021d]::HandlerInner>::bug::<&alloc[fc860cae0dfa1ab1]::string::String>
  18:     0x7f1b62595630 - <rustc_errors[45159b7f7e36021d]::Handler>::bug::<&alloc[fc860cae0dfa1ab1]::string::String>
  19:     0x7f1b62581a9b - rustc_middle[a96ac5d591578447]::util::bug::opt_span_bug_fmt::<rustc_span[f8bdfaef83e46314]::span_encoding::Span>::{closure#0}
  20:     0x7f1b625804fa - rustc_middle[a96ac5d591578447]::ty::context::tls::with_opt::<rustc_middle[a96ac5d591578447]::util::bug::opt_span_bug_fmt<rustc_span[f8bdfaef83e46314]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f1b625804c6 - rustc_middle[a96ac5d591578447]::ty::context::tls::with_context_opt::<rustc_middle[a96ac5d591578447]::ty::context::tls::with_opt<rustc_middle[a96ac5d591578447]::util::bug::opt_span_bug_fmt<rustc_span[f8bdfaef83e46314]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f1b625819e6 - rustc_middle[a96ac5d591578447]::util::bug::opt_span_bug_fmt::<rustc_span[f8bdfaef83e46314]::span_encoding::Span>
  23:     0x7f1b605fc4b3 - rustc_middle[a96ac5d591578447]::util::bug::bug_fmt
  24:     0x7f1b60fad01c - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute
  25:     0x7f1b62539aba - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute::{closure#0}
  26:     0x7f1b60fad07c - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute
  27:     0x7f1b62539aba - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute::{closure#0}
  28:     0x7f1b60fad07c - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute
  29:     0x7f1b62539aba - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute::{closure#0}
  30:     0x7f1b60fad07c - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute
  31:     0x7f1b62539aba - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute::{closure#0}
  32:     0x7f1b60fad143 - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute
  33:     0x7f1b62539aba - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute::{closure#0}
  34:     0x7f1b60fad07c - <rustc_middle[a96ac5d591578447]::ty::layout::SizeSkeleton>::compute
  35:     0x7f1b6154bd55 - <rustc_hir_typeck[8554c3125ad8338a]::fn_ctxt::FnCtxt>::check_transmute
  36:     0x7f1b60ecf984 - rustc_hir_typeck[8554c3125ad8338a]::typeck
  37:     0x7f1b60a52536 - rustc_query_system[704b80a7bc44cd49]::query::plumbing::try_execute_query::<rustc_query_impl[217bee59c5548bf5]::queries::typeck, rustc_query_impl[217bee59c5548bf5]::plumbing::QueryCtxt>
  38:     0x7f1b60a51e83 - <rustc_query_impl[217bee59c5548bf5]::Queries as rustc_middle[a96ac5d591578447]::ty::query::QueryEngine>::typeck
  39:     0x7f1b5ffd9299 - rustc_hir_analysis[357075c2c3fc2a7b]::check::check::check_mod_item_types
  40:     0x7f1b61614a0e - rustc_query_system[704b80a7bc44cd49]::query::plumbing::try_execute_query::<rustc_query_impl[217bee59c5548bf5]::queries::check_mod_item_types, rustc_query_impl[217bee59c5548bf5]::plumbing::QueryCtxt>
  41:     0x7f1b61614593 - <rustc_query_impl[217bee59c5548bf5]::Queries as rustc_middle[a96ac5d591578447]::ty::query::QueryEngine>::check_mod_item_types
  42:     0x7f1b602f7e44 - <rustc_session[7e23441c2db8ce4a]::session::Session>::time::<(), rustc_hir_analysis[357075c2c3fc2a7b]::check_crate::{closure#6}>
  43:     0x7f1b602f4d88 - rustc_hir_analysis[357075c2c3fc2a7b]::check_crate
  44:     0x7f1b602ead12 - rustc_interface[6bf42eb308c32713]::passes::analysis
  45:     0x7f1b617f371c - rustc_query_system[704b80a7bc44cd49]::query::plumbing::try_execute_query::<rustc_query_impl[217bee59c5548bf5]::queries::analysis, rustc_query_impl[217bee59c5548bf5]::plumbing::QueryCtxt>
  46:     0x7f1b617f3410 - <rustc_query_impl[217bee59c5548bf5]::Queries as rustc_middle[a96ac5d591578447]::ty::query::QueryEngine>::analysis
  47:     0x7f1b616182f9 - <rustc_middle[a96ac5d591578447]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[d355a67661263e47]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>
  48:     0x7f1b61210498 - rustc_span[f8bdfaef83e46314]::with_source_map::<core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>, rustc_interface[6bf42eb308c32713]::interface::run_compiler<core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>, rustc_driver_impl[d355a67661263e47]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  49:     0x7f1b6120770c - std[e52d7c968ed01318]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[6bf42eb308c32713]::util::run_in_thread_pool_with_globals<rustc_interface[6bf42eb308c32713]::interface::run_compiler<core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>, rustc_driver_impl[d355a67661263e47]::run_compiler::{closure#1}>::{closure#0}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>
  50:     0x7f1b6120713a - <<std[e52d7c968ed01318]::thread::Builder>::spawn_unchecked_<rustc_interface[6bf42eb308c32713]::util::run_in_thread_pool_with_globals<rustc_interface[6bf42eb308c32713]::interface::run_compiler<core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>, rustc_driver_impl[d355a67661263e47]::run_compiler::{closure#1}>::{closure#0}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>::{closure#1} as core[125d846441ac421f]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  51:     0x7f1b5ec6a793 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc0a50816e1eb2bba
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/alloc/src/boxed.rs:1988:9
  52:     0x7f1b5ec6a793 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb2f83fc2049033c3
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/alloc/src/boxed.rs:1988:9
  53:     0x7f1b5ec6a793 - std::sys::unix::thread::Thread::new::thread_start::hce5861512f8bf7ea
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys/unix/thread.rs:108:17
  54:     0x7f1b5e9d4ff2 - start_thread
  55:     0x7f1b5ea57bfc - clone3
  56:                0x0 - <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 1.70.0-nightly (7b4f48927 2023-03-12) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `TRANSMUTED_U32`
#1 [check_mod_item_types] checking item types in top-level module
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors; 2 warnings emitted

Some errors have detailed explanations: E0412, E0601.
For more information about an error, try `rustc --explain E0412`.

[Nilstrieb]

searched nightlies: from nightly-2021-01-01 to nightly-2023-03-12
regressed nightly: nightly-2023-01-05
searched commit range: c757267...659e169
regressed commit: ddad1e1

bisected with cargo-bisect-rustc v0.6.5

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc 2021-01-01 --end 2023-03-12 --regress ice --access github

Note that this requires edition 2015/2018, as edition 2021 hard errors on the bare trait object before ever getting to layout code.

cc @compiler-errors

[compiler-errors]

@rustbot claim