ICE: layout.is_sized()

[matthiaskrgr]

Code

rustc --crate-type=lib -Zmir-opt-level=2 -Zpolymorphize=on

pub trait A {
    type B;
}

pub struct S<T: A>(T::B);

pub fn foo<T: A>(p: *mut S<T>) {
    let sides: Vec<_> = Vec::from([[[0, 1], [2, 3]], [[4, 5], [6, 7]]]);
    let mut side = sides.iter();
    while let Some(points) = side.next() {
        match &points[..] {
            [p1, p2] => match [p1[..], p2[..]] {
                [[x1, y1], [x2, y2]] => {}
                _ => (),
            },
            _ => (),
        }
    }
}

Meta

rustc --version --verbose:

rustc 1.74.0-nightly (b4e54c6e3 2023-09-11)
binary: rustc
commit-hash: b4e54c6e39984840a04dcd02d14ec8c3574d30e5
commit-date: 2023-09-11
host: x86_64-unknown-linux-gnu
release: 1.74.0-nightly
LLVM version: 17.0.0

Error output

warning: unused variable: `x1`
 --> f.rs:9:19
  |
9 |                 [[x1, y1], [x2, y2]] => {}
  |                   ^^ help: if this is intentional, prefix it with an underscore: `_x1`
  |
  = note: `#[warn(unused_variables)]` on by default

warning: unused variable: `y1`
 --> f.rs:9:23
  |
9 |                 [[x1, y1], [x2, y2]] => {}
  |                       ^^ help: if this is intentional, prefix it with an underscore: `_y1`

warning: unused variable: `x2`
 --> f.rs:9:29
  |
9 |                 [[x1, y1], [x2, y2]] => {}
  |                             ^^ help: if this is intentional, prefix it with an underscore: `_x2`

warning: unused variable: `y2`
 --> f.rs:9:33
  |
9 |                 [[x1, y1], [x2, y2]] => {}
  |                                 ^^ help: if this is intentional, prefix it with an underscore: `_y2`

error[E0161]: cannot move a value of type `[i32]`
 --> f.rs:8:32
  |
8 |             [p1, p2] => match [p1[..], p2[..]] {
  |                                ^^^^^^ the size of `[i32]` cannot be statically determined

error[E0161]: cannot move a value of type `[i32]`
 --> f.rs:8:40
  |
8 |             [p1, p2] => match [p1[..], p2[..]] {
  |                                        ^^^^^^ the size of `[i32]` cannot be statically determined

error[E0508]: cannot move out of type `[i32]`, a non-copy slice
 --> f.rs:8:32
  |
8 |             [p1, p2] => match [p1[..], p2[..]] {
  |                                ^^^^^^
  |                                |
  |                                cannot move out of here
  |                                move occurs because value has type `[i32]`, which does not implement the `Copy` trait

error[E0508]: cannot move out of type `[i32]`, a non-copy slice
 --> f.rs:8:40
  |
8 |             [p1, p2] => match [p1[..], p2[..]] {
  |                                        ^^^^^^
  |                                        |
  |                                        cannot move out of here
  |                                        move occurs because value has type `[i32]`, which does not implement the `Copy` trait

Backtrace

thread 'rustc' panicked at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/compiler/rustc_const_eval/src/interpret/projection.rs:68:9:
assertion failed: layout.is_sized()
stack backtrace:
   0:     0x7f5ec2901efc - std::backtrace_rs::backtrace::libunwind::trace::h170ba77b7937dfc1
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f5ec2901efc - std::backtrace_rs::backtrace::trace_unsynchronized::ha3ffdef167b36dcf
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f5ec2901efc - std::sys_common::backtrace::_print_fmt::h3593f75d449d7c19
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f5ec2901efc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3d681876fb1a0c35
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f5ec296815c - core::fmt::rt::Argument::fmt::h28dae40336be117d
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/core/src/fmt/rt.rs:138:9
   5:     0x7f5ec296815c - core::fmt::write::hc7ede5ba8d1b34fc
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f5ec28f493e - std::io::Write::write_fmt::h4b5cbdfd5c06e4d9
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/io/mod.rs:1714:15
   7:     0x7f5ec2901ce4 - std::sys_common::backtrace::_print::hf9f8d894d0fba8f4
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f5ec2901ce4 - std::sys_common::backtrace::print::h6736ec2ce0b1565d
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f5ec2904dda - std::panicking::panic_hook_with_disk_dump::{{closure}}::h23059af5ca98b58a
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/panicking.rs:280:22
  10:     0x7f5ec2904ad5 - std::panicking::panic_hook_with_disk_dump::h6a2d92a5ff298e6f
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/panicking.rs:314:9
  11:     0x7f5ec1751e49 - rustc_driver_impl[f8442aae50b2ebe1]::install_ice_hook::{closure#0}
  12:     0x7f5ec2905693 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h34ea97e0bbf89982
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/alloc/src/boxed.rs:2021:9
  13:     0x7f5ec2905693 - std::panicking::rust_panic_with_hook::h71b4835249b93020
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/panicking.rs:757:13
  14:     0x7f5ec29053c6 - std::panicking::begin_panic_handler::{{closure}}::haf0bd6f65b167fe9
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/panicking.rs:623:13
  15:     0x7f5ec2902426 - std::sys_common::backtrace::__rust_end_short_backtrace::hec6b1c9c3aaa2fc0
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/sys_common/backtrace.rs:170:18
  16:     0x7f5ec2905152 - rust_begin_unwind
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/panicking.rs:619:5
  17:     0x7f5ec2964505 - core::panicking::panic_fmt::hfe421f38e4eebe22
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/core/src/panicking.rs:72:14
  18:     0x7f5ec29645a3 - core::panicking::panic::h78eb9cd691eeb3c6
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/core/src/panicking.rs:127:5
  19:     0x7f5ec08c44de - <rustc_const_eval[d84dc7f24a6adf38]::interpret::eval_context::InterpCx<rustc_mir_transform[4c572a45d5e223d3]::const_prop::ConstPropMachine>>::project_index::<rustc_const_eval[d84dc7f24a6adf38]::interpret::place::PlaceTy>
  20:     0x7f5ec08c9f3a - <rustc_const_eval[d84dc7f24a6adf38]::interpret::eval_context::InterpCx<rustc_mir_transform[4c572a45d5e223d3]::const_prop::ConstPropMachine>>::eval_place
  21:     0x7f5ec08a66cb - <rustc_const_eval[d84dc7f24a6adf38]::interpret::eval_context::InterpCx<rustc_mir_transform[4c572a45d5e223d3]::const_prop::ConstPropMachine>>::eval_rvalue_into_place
  22:     0x7f5ebfb9a361 - <rustc_mir_transform[4c572a45d5e223d3]::const_prop::ConstPropagator as rustc_middle[b639b8b23e8d3436]::mir::visit::MutVisitor>::visit_assign
  23:     0x7f5ebfb993dd - <rustc_mir_transform[4c572a45d5e223d3]::const_prop::ConstPropagator as rustc_middle[b639b8b23e8d3436]::mir::visit::MutVisitor>::visit_basic_block_data
  24:     0x7f5ebfb98d0e - <rustc_mir_transform[4c572a45d5e223d3]::const_prop::ConstProp as rustc_middle[b639b8b23e8d3436]::mir::MirPass>::run_pass
  25:     0x7f5ec06663bd - rustc_mir_transform[4c572a45d5e223d3]::pass_manager::run_passes
  26:     0x7f5ec06658e7 - rustc_mir_transform[4c572a45d5e223d3]::optimized_mir
  27:     0x7f5ebf893cb8 - rustc_query_impl[5d5a3cff05f7bed8]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5d5a3cff05f7bed8]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b639b8b23e8d3436]::query::erase::Erased<[u8; 8usize]>>
  28:     0x7f5ebf893c81 - <rustc_query_impl[5d5a3cff05f7bed8]::query_impl::optimized_mir::dynamic_query::{closure#2} as core[8975a1ebd15850b5]::ops::function::FnOnce<(rustc_middle[b639b8b23e8d3436]::ty::context::TyCtxt, rustc_span[319b9c0a2f58e367]::def_id::DefId)>>::call_once
  29:     0x7f5ebf84e490 - rustc_query_system[50f896f966c25655]::query::plumbing::try_execute_query::<rustc_query_impl[5d5a3cff05f7bed8]::DynamicConfig<rustc_query_system[50f896f966c25655]::query::caches::DefaultCache<rustc_span[319b9c0a2f58e367]::def_id::DefId, rustc_middle[b639b8b23e8d3436]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5d5a3cff05f7bed8]::plumbing::QueryCtxt, false>
  30:     0x7f5ec10cf6e2 - rustc_query_impl[5d5a3cff05f7bed8]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  31:     0x7f5ec1f3cf17 - rustc_middle[b639b8b23e8d3436]::query::plumbing::query_get_at::<rustc_query_system[50f896f966c25655]::query::caches::DefaultCache<rustc_span[319b9c0a2f58e367]::def_id::DefId, rustc_middle[b639b8b23e8d3436]::query::erase::Erased<[u8; 8usize]>>>
  32:     0x7f5ebff19102 - rustc_query_impl[5d5a3cff05f7bed8]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5d5a3cff05f7bed8]::query_impl::unused_generic_params::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b639b8b23e8d3436]::query::erase::Erased<[u8; 4usize]>>
  33:     0x7f5ec0005f25 - rustc_query_system[50f896f966c25655]::query::plumbing::try_execute_query::<rustc_query_impl[5d5a3cff05f7bed8]::DynamicConfig<rustc_query_system[50f896f966c25655]::query::caches::DefaultCache<rustc_middle[b639b8b23e8d3436]::ty::instance::InstanceDef, rustc_middle[b639b8b23e8d3436]::query::erase::Erased<[u8; 4usize]>>, false, false, false>, rustc_query_impl[5d5a3cff05f7bed8]::plumbing::QueryCtxt, false>
  34:     0x7f5ec0005bb9 - rustc_query_impl[5d5a3cff05f7bed8]::query_impl::unused_generic_params::get_query_non_incr::__rust_end_short_backtrace
  35:     0x7f5ec0919618 - <rustc_session[680ed56a62bc0fcf]::session::Session>::time::<(), rustc_interface[afabc26049662c5e]::passes::analysis::{closure#2}>
  36:     0x7f5ec0915290 - rustc_interface[afabc26049662c5e]::passes::analysis
  37:     0x7f5ec0b9f46a - rustc_query_impl[5d5a3cff05f7bed8]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5d5a3cff05f7bed8]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[b639b8b23e8d3436]::query::erase::Erased<[u8; 1usize]>>
  38:     0x7f5ec0b9f459 - <rustc_query_impl[5d5a3cff05f7bed8]::query_impl::analysis::dynamic_query::{closure#2} as core[8975a1ebd15850b5]::ops::function::FnOnce<(rustc_middle[b639b8b23e8d3436]::ty::context::TyCtxt, ())>>::call_once
  39:     0x7f5ec0e85174 - rustc_query_system[50f896f966c25655]::query::plumbing::try_execute_query::<rustc_query_impl[5d5a3cff05f7bed8]::DynamicConfig<rustc_query_system[50f896f966c25655]::query::caches::SingleCache<rustc_middle[b639b8b23e8d3436]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[5d5a3cff05f7bed8]::plumbing::QueryCtxt, false>
  40:     0x7f5ec0e84ee9 - rustc_query_impl[5d5a3cff05f7bed8]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7f5ec0c6ac13 - <rustc_middle[b639b8b23e8d3436]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[f8442aae50b2ebe1]::run_compiler::{closure#1}::{closure#2}::{closure#6}, core[8975a1ebd15850b5]::result::Result<(), rustc_span[319b9c0a2f58e367]::ErrorGuaranteed>>
  42:     0x7f5ec0c69d08 - <rustc_interface[afabc26049662c5e]::interface::Compiler>::enter::<rustc_driver_impl[f8442aae50b2ebe1]::run_compiler::{closure#1}::{closure#2}, core[8975a1ebd15850b5]::result::Result<core[8975a1ebd15850b5]::option::Option<rustc_interface[afabc26049662c5e]::queries::Linker>, rustc_span[319b9c0a2f58e367]::ErrorGuaranteed>>
  43:     0x7f5ec0c62fd4 - std[ba7dab7da19e8c24]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[afabc26049662c5e]::util::run_in_thread_with_globals<rustc_interface[afabc26049662c5e]::interface::run_compiler<core[8975a1ebd15850b5]::result::Result<(), rustc_span[319b9c0a2f58e367]::ErrorGuaranteed>, rustc_driver_impl[f8442aae50b2ebe1]::run_compiler::{closure#1}>::{closure#0}, core[8975a1ebd15850b5]::result::Result<(), rustc_span[319b9c0a2f58e367]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8975a1ebd15850b5]::result::Result<(), rustc_span[319b9c0a2f58e367]::ErrorGuaranteed>>
  44:     0x7f5ec0c6272e - <<std[ba7dab7da19e8c24]::thread::Builder>::spawn_unchecked_<rustc_interface[afabc26049662c5e]::util::run_in_thread_with_globals<rustc_interface[afabc26049662c5e]::interface::run_compiler<core[8975a1ebd15850b5]::result::Result<(), rustc_span[319b9c0a2f58e367]::ErrorGuaranteed>, rustc_driver_impl[f8442aae50b2ebe1]::run_compiler::{closure#1}>::{closure#0}, core[8975a1ebd15850b5]::result::Result<(), rustc_span[319b9c0a2f58e367]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8975a1ebd15850b5]::result::Result<(), rustc_span[319b9c0a2f58e367]::ErrorGuaranteed>>::{closure#1} as core[8975a1ebd15850b5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:     0x7f5ec2910075 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf087c3a953991192
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/alloc/src/boxed.rs:2007:9
  46:     0x7f5ec2910075 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h911ae42726efeb98
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/alloc/src/boxed.rs:2007:9
  47:     0x7f5ec2910075 - std::sys::unix::thread::Thread::new::thread_start::hb163d3257e70a2e6
                               at /rustc/b4e54c6e39984840a04dcd02d14ec8c3574d30e5/library/std/src/sys/unix/thread.rs:108:17
  48:     0x7f5ebe28c9eb - <unknown>
  49:     0x7f5ebe310dfc - <unknown>
  50:                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 attach the file at `/tmp/im/2/rustc-ice-2023-09-13T05:00:57.948105458Z-1438393.txt` to your bug report

note: compiler flags: --crate-type lib -Z mir-opt-level=2 -Z polymorphize=on

query stack during panic:
#0 [optimized_mir] optimizing MIR for `foo`
#1 [unused_generic_params] determining which generic parameters are unused by `foo`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors; 4 warnings emitted

Some errors have detailed explanations: E0161, E0508.
For more information about an error, try `rustc --explain E0161`.