ICE: rustc_abi `the len is 0 but the index is 0` calculating offset

[matthiaskrgr]

auto-reduced (treereduce-rust) + some manual reduction

use std::marker::PhantomData;

pub struct Id<'id>();

pub struct Item<'life, T> {
    data: T,
}

pub struct Token<'life, 'borrow, 'compact, 'reborrow, T>
where
    'life: 'reborrow,
    T: Tokenize,
{
    ptr: *mut <T as Tokenize>::Tokenized,
    ptr: core::ptr::NonNull<T::Tokenized>,
    _phantom: PhantomData<Id<'life>>,
}

impl<'life> Arena<'life> {
    pub fn tokenize<'before, 'compact, 'borrow, 'reborrow, T, U>(
        item: Item<'life, &'before mut T>,
    ) -> Token<'life, 'borrow, 'compact, 'reborrow, U>
    where
        T: Tokenize<'life, 'borrow, 'compact, 'reborrow, Untokenized = U>,
        T::Untokenized: Tokenize<'life, 'borrow, 'compact, 'reborrow>,
    {
        let dst = item.data as *mut T as *mut T::Tokenized;
        Token {
            ptr: core::ptr::NonNull::new(dst as *mut _).unwrap(),
            _phantom: PhantomData,
        }
    }
}

pub trait Tokenize {
    type Tokenized;
    type Untokenized;
}

original code

original:

//@ check-pass
#![feature(inline_const)]
#![feature(generic_const_exprs)]

#![allow(incomplete_features)]
use std::marker::PhantomData;

pub struct Equal<const T: usize, const R: usize>();
pub trait True {}
impl<const T: usize> True for Equal<T, T> {}

// replacement for generativity
pub struct Id<'id>(PhantomData<fn(&'id ()) -> &'id ()>);
pub struct Guard<'id>(Id<'id>);
fn make_guard<'id>(i: &'id Id<'id>) -> Guard<'id> {
    Guard(Id(PhantomData))
}

impl<'id> Into<Id<'id>> for Guard<'id> {
    fn into(self) -> Id<'id> {
        self.0
    }
}

pub struct Arena<'life> {
    bytes: *mut [u8],
    //bitmap: RefCell<RoaringBitmap>,
    _token: PhantomData<Id<'life>>,
}

#[repr(transparent)]
pub struct Item<'life, T> {
    data: T,
    _phantom: PhantomData<Id<'life>>,
}

#[repr(transparent)]
pub struct Token<'life, 'borrow, 'compact, 'reborrow, T>
where
    'life: 'reborrow,
    T: Tokenize<'life, 'borrow, 'compact, 'reborrow>,
{
    ptr: *mut <T as Tokenize>::Tokenized,
    ptr: core::ptr::NonNull<T::Tokenized>,
    _phantom: PhantomData<Id<'life>>,
    _compact: PhantomData<&'borrow Guard<'compact>>,
    _result: PhantomData<&'reborrow T::Untokenized>,
}

impl<'life> Arena<'life> {
    pub fn tokenize<'before, 'compact, 'borrow, 'reborrow, T, U>(
        &self,
        guard: &'borrow Guard<'compact>,
        item: Item<'life, &'before mut T>,
    ) -> Token<'life, 'borrow, 'compact, 'reborrow, U>
    where
        T: Tokenize<'life, 'borrow, 'compact, 'reborrow, Untokenized = U>,
        T::Untokenized: Tokenize<'life, 'borrow, 'compact, 'reborrow>,
        Equal<{ core::mem::size_of::<T>() }, { core::mem::size_of::<U>() }>: True,
        'compact: 'borrow,
        'life: 'reborrow,
        'life: 'compact,
        'life: 'borrow,
        // 'borrow: 'before ??
    {
        let dst = item.data as *mut T as *mut T::Tokenized;
        Token {
            ptr: core::ptr::NonNull::new(dst as *mut _).unwrap(),
            _phantom: PhantomData,
            _compact: PhantomData,
            _result: PhantomData,
        }
    }
}

pub trait Tokenize<'life, 'borrow, 'compact, 'reborrow>
where
    'compact: 'borrow,
    'life: 'reborrow,
    'life: 'borrow,
    'life: 'compact,
{
    type Tokenized;
    type Untokenized;
    const TO: fn(&Arena<'life>, &'borrow Guard<'compact>, Self) -> Self::Tokenized;
    const FROM: fn(&'reborrow Arena<'life>, Self::Tokenized) -> Self::Untokenized;
}

macro_rules! tokenize {
    ($to:expr, $from:expr) => {
        const TO: fn(&Arena<'life>, &'borrow Guard<'compact>, Self) -> Self::Tokenized = $to;
        const FROM: fn(&'reborrow Arena<'life>, Self::Tokenized) -> Self::Untokenized = $from;
    };
}

struct Foo<'life, 'borrow>(Option<Item<'life, &'borrow mut Bar>>);
struct UnitVariant<'life, 'borrow, 'compact, 'reborrow>(
    Option<Token<'life, 'borrow, 'compact, 'reborrow, Bar>>,
);
struct Bar(u8);

impl<'life, 'before, 'borrow, 'compact, 'reborrow> Tokenize<'life, 'borrow, 'compact, 'reborrow>
    for Foo<'life, 'before>
where
    'compact: 'borrow,
    'life: 'reborrow,
    'life: 'borrow,
    'life: 'compact,
{
    type Tokenized = TokenFoo<'life, 'borrow, 'compact, 'reborrow>;
    type Untokenized = Foo<'life, 'reborrow>;
    tokenize!(foo_to, foo_from);
}

impl<'life, 'borrow, 'compact, 'reborrow> Tokenize<'life, 'borrow, 'compact, 'reborrow> for Bar
where
    'compact: 'borrow,
    'life: 'reborrow,
    'life: 'borrow,
    'life: 'compact,
{
    type Tokenized = Bar;
    type Untokenized = Bar;
    tokenize!(bar_to, bar_from);
}

fn bar_to<'life, 'borrow, 'compact>(
    arena: &Arena<'life>,
    guard: &'borrow Guard<'compact>,
    s: Bar,
) -> Bar {
    s
}
fn bar_from<'life, 'reborrow>(arena: &'reborrow Arena<'life>, s: Bar) -> Bar {
    s
}

fn foo_to<'life, 'borrow, 'compact, 'reborrow, 'before>(
    arena: &'before Arena<'life>,
    guard: &'borrow Guard<'compact>,
    s: Foo<'life, 'before>,
) -> TokenFoo<'life, 'borrow, 'compact, 'reborrow> {
    let Foo(bar) = s;
    TokenFoo(bar.map(|bar| arena.tokenize(guard, bar)))
}
fn foo_from<'life, 'borrow, 'compact, 'reborrow>(
    arena: &'reborrow Arena<'life>,
    s: TokenFoo<'life, 'borrow, 'compact, 'reborrow>,
) -> Foo<'life, 'reborrow> {
    Foo(s.0.map(|bar| panic!()))
}

fn main() {}

Version information

rustc 1.79.0-nightly (f3c660886 2024-04-14)
binary: rustc
commit-hash: f3c66088610c1b80110297c2d9a8b5f9265b013f
commit-date: 2024-04-14
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.3

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zmir-opt-level=5 -Zpolymorphize=on

Program output

error[E0412]: cannot find type `Arena` in this scope
  --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:19:13
   |
19 | impl<'life> Arena<'life> {
   |             ^^^^^ not found in this scope

error[E0601]: `main` function not found in crate `mvce`
  --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:38:2
   |
38 | }
   |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs`

error[E0124]: field `ptr` is already declared
  --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:15:5
   |
14 |     ptr: *mut <T as Tokenize>::Tokenized,
   |     ------------------------------------ `ptr` first declared here
15 |     ptr: core::ptr::NonNull<T::Tokenized>,
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ field already declared

error[E0392]: lifetime parameter `'id` is never used
 --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:3:15
  |
3 | pub struct Id<'id>();
  |               ^^^ unused lifetime parameter
  |
  = help: consider removing `'id`, referring to it in a field, or using a marker such as `PhantomData`

error[E0392]: lifetime parameter `'life` is never used
 --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:5:17
  |
5 | pub struct Item<'life, T> {
  |                 ^^^^^ unused lifetime parameter
  |
  = help: consider removing `'life`, referring to it in a field, or using a marker such as `PhantomData`

error[E0392]: lifetime parameter `'life` is never used
 --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:9:18
  |
9 | pub struct Token<'life, 'borrow, 'compact, 'reborrow, T>
  |                  ^^^^^ unused lifetime parameter
  |
  = help: consider removing `'life`, referring to it in a field, or using a marker such as `PhantomData`

error[E0392]: lifetime parameter `'borrow` is never used
 --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:9:25
  |
9 | pub struct Token<'life, 'borrow, 'compact, 'reborrow, T>
  |                         ^^^^^^^ unused lifetime parameter
  |
  = help: consider removing `'borrow`, referring to it in a field, or using a marker such as `PhantomData`

error[E0392]: lifetime parameter `'compact` is never used
 --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:9:34
  |
9 | pub struct Token<'life, 'borrow, 'compact, 'reborrow, T>
  |                                  ^^^^^^^^ unused lifetime parameter
  |
  = help: consider removing `'compact`, referring to it in a field, or using a marker such as `PhantomData`

error[E0392]: lifetime parameter `'reborrow` is never used
 --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:9:44
  |
9 | pub struct Token<'life, 'borrow, 'compact, 'reborrow, T>
  |                                            ^^^^^^^^^ unused lifetime parameter
  |
  = help: consider removing `'reborrow`, referring to it in a field, or using a marker such as `PhantomData`

error[E0107]: trait takes 0 lifetime arguments but 4 lifetime arguments were supplied
  --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:24:12
   |
24 |         T: Tokenize<'life, 'borrow, 'compact, 'reborrow, Untokenized = U>,
   |            ^^^^^^^^------------------------------------------------------ help: remove these generics
   |            |
   |            expected 0 lifetime arguments
   |
note: trait defined here, with 0 lifetime parameters
  --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:35:11
   |
35 | pub trait Tokenize {
   |           ^^^^^^^^

error[E0107]: trait takes 0 lifetime arguments but 4 lifetime arguments were supplied
  --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:25:25
   |
25 |         T::Untokenized: Tokenize<'life, 'borrow, 'compact, 'reborrow>,
   |                         ^^^^^^^^------------------------------------- help: remove these generics
   |                         |
   |                         expected 0 lifetime arguments
   |
note: trait defined here, with 0 lifetime parameters
  --> /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:35:11
   |
35 | pub trait Tokenize {
   |           ^^^^^^^^

thread 'rustc' panicked at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/compiler/rustc_abi/src/lib.rs:1201:66:
index out of bounds: the len is 0 but the index is 0
stack backtrace:
   0:     0x7f75db283b55 - std::backtrace_rs::backtrace::libunwind::trace::h03dc4c75a602abd6
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7f75db283b55 - std::backtrace_rs::backtrace::trace_unsynchronized::h1821d384db4b0e26
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f75db283b55 - std::sys_common::backtrace::_print_fmt::h1412fd631a460d8d
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f75db283b55 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h585bce00fd030aee
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f75db2d2e3b - core::fmt::rt::Argument::fmt::h51a122f876b01508
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/core/src/fmt/rt.rs:165:63
   5:     0x7f75db2d2e3b - core::fmt::write::h4dfb720a2f630255
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/core/src/fmt/mod.rs:1157:21
   6:     0x7f75db27875f - std::io::Write::write_fmt::hb827ffc1239a96a6
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/io/mod.rs:1832:15
   7:     0x7f75db28392e - std::sys_common::backtrace::_print::h34ff464c9a4e054c
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f75db28392e - std::sys_common::backtrace::print::hb47d1eaca16fac84
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f75db2862a9 - std::panicking::default_hook::{{closure}}::h7fc91e7cfecf6096
  10:     0x7f75db285fed - std::panicking::default_hook::h677e761d182faf87
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/panicking.rs:291:9
  11:     0x7f75d7c7731c - std[184458c9395fed62]::panicking::update_hook::<alloc[945b23d7edb322c9]::boxed::Box<rustc_driver_impl[f047c15e8130c94f]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f75db2869ac - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::ha779244beb256d6f
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/alloc/src/boxed.rs:2032:9
  13:     0x7f75db2869ac - std::panicking::rust_panic_with_hook::h74b58e16e7d0027a
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/panicking.rs:792:13
  14:     0x7f75db286756 - std::panicking::begin_panic_handler::{{closure}}::h3945bb507775f2bc
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/panicking.rs:657:13
  15:     0x7f75db284019 - std::sys_common::backtrace::__rust_end_short_backtrace::hc7e0fa976db9fff0
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f75db286487 - rust_begin_unwind
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/panicking.rs:645:5
  17:     0x7f75db2cf2e6 - core::panicking::panic_fmt::ha9dbe3d7803e94c3
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/core/src/panicking.rs:72:14
  18:     0x7f75db2cf507 - core::panicking::panic_bounds_check::h6b123be699451bc5
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/core/src/panicking.rs:268:5
  19:     0x7f75da677ac8 - <rustc_abi[79353852cb49b78b]::FieldsShape<rustc_target[c1582aecfafb9bc]::abi::FieldIdx>>::offset.cold
  20:     0x7f75d9973082 - <rustc_const_eval[3991ad9ab9a5ab30]::interpret::eval_context::InterpCx<rustc_const_eval[3991ad9ab9a5ab30]::const_eval::dummy_machine::DummyMachine>>::project_field::<rustc_const_eval[3991ad9ab9a5ab30]::interpret::operand::OpTy>
  21:     0x7f75d82fb944 - <rustc_mir_transform[560a276af31fbb04]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#0}
  22:     0x7f75d8259929 - <rustc_mir_dataflow[6f840b518e755586]::value_analysis::Map>::for_each_projection_value::<rustc_const_eval[3991ad9ab9a5ab30]::interpret::operand::OpTy, <rustc_mir_transform[560a276af31fbb04]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#0}, <rustc_mir_transform[560a276af31fbb04]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#1}>
  23:     0x7f75d82fb8f6 - <rustc_mir_transform[560a276af31fbb04]::dataflow_const_prop::ConstAnalysis>::assign_constant
  24:     0x7f75d82cac17 - <rustc_mir_transform[560a276af31fbb04]::dataflow_const_prop::ConstAnalysis>::assign_operand
  25:     0x7f75d82c9b27 - <rustc_mir_transform[560a276af31fbb04]::dataflow_const_prop::ConstAnalysis as rustc_mir_dataflow[6f840b518e755586]::value_analysis::ValueAnalysis>::handle_assign
  26:     0x7f75d82f9cce - <rustc_mir_transform[560a276af31fbb04]::dataflow_const_prop::DataflowConstProp as rustc_middle[55da801b9dd73f34]::mir::MirPass>::run_pass
  27:     0x7f75d900188d - rustc_mir_transform[560a276af31fbb04]::pass_manager::run_passes_inner
  28:     0x7f75d96259b1 - rustc_mir_transform[560a276af31fbb04]::optimized_mir
  29:     0x7f75d9624b9b - rustc_query_impl[8a57831cea33f912]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8a57831cea33f912]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[55da801b9dd73f34]::query::erase::Erased<[u8; 8usize]>>
  30:     0x7f75d91041de - rustc_query_system[698870ff4aca75a8]::query::plumbing::try_execute_query::<rustc_query_impl[8a57831cea33f912]::DynamicConfig<rustc_query_system[698870ff4aca75a8]::query::caches::DefIdCache<rustc_middle[55da801b9dd73f34]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[8a57831cea33f912]::plumbing::QueryCtxt, false>
  31:     0x7f75d910391e - rustc_query_impl[8a57831cea33f912]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7f75d92f261e - rustc_middle[55da801b9dd73f34]::query::plumbing::query_get_at::<rustc_query_system[698870ff4aca75a8]::query::caches::DefIdCache<rustc_middle[55da801b9dd73f34]::query::erase::Erased<[u8; 8usize]>>>
  33:     0x7f75d958ebc7 - rustc_query_impl[8a57831cea33f912]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8a57831cea33f912]::query_impl::unused_generic_params::dynamic_query::{closure#2}::{closure#0}, rustc_middle[55da801b9dd73f34]::query::erase::Erased<[u8; 4usize]>>
  34:     0x7f75d958e399 - rustc_query_system[698870ff4aca75a8]::query::plumbing::try_execute_query::<rustc_query_impl[8a57831cea33f912]::DynamicConfig<rustc_query_system[698870ff4aca75a8]::query::caches::DefaultCache<rustc_middle[55da801b9dd73f34]::ty::instance::InstanceDef, rustc_middle[55da801b9dd73f34]::query::erase::Erased<[u8; 4usize]>>, false, false, false>, rustc_query_impl[8a57831cea33f912]::plumbing::QueryCtxt, false>
  35:     0x7f75d958e08e - rustc_query_impl[8a57831cea33f912]::query_impl::unused_generic_params::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f75d9589bc0 - rustc_interface[e2c21f0ab22f590a]::passes::analysis
  37:     0x7f75d95888c7 - rustc_query_impl[8a57831cea33f912]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8a57831cea33f912]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[55da801b9dd73f34]::query::erase::Erased<[u8; 1usize]>>
  38:     0x7f75d9e61ea5 - rustc_query_system[698870ff4aca75a8]::query::plumbing::try_execute_query::<rustc_query_impl[8a57831cea33f912]::DynamicConfig<rustc_query_system[698870ff4aca75a8]::query::caches::SingleCache<rustc_middle[55da801b9dd73f34]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[8a57831cea33f912]::plumbing::QueryCtxt, false>
  39:     0x7f75d9e61c09 - rustc_query_impl[8a57831cea33f912]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  40:     0x7f75d9cc0793 - rustc_interface[e2c21f0ab22f590a]::interface::run_compiler::<core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>, rustc_driver_impl[f047c15e8130c94f]::run_compiler::{closure#0}>::{closure#0}
  41:     0x7f75d9d93d1d - std[184458c9395fed62]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[e2c21f0ab22f590a]::util::run_in_thread_with_globals<rustc_interface[e2c21f0ab22f590a]::util::run_in_thread_pool_with_globals<rustc_interface[e2c21f0ab22f590a]::interface::run_compiler<core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>, rustc_driver_impl[f047c15e8130c94f]::run_compiler::{closure#0}>::{closure#0}, core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>>::{closure#0}, core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>>
  42:     0x7f75d9d93b2a - <<std[184458c9395fed62]::thread::Builder>::spawn_unchecked_<rustc_interface[e2c21f0ab22f590a]::util::run_in_thread_with_globals<rustc_interface[e2c21f0ab22f590a]::util::run_in_thread_pool_with_globals<rustc_interface[e2c21f0ab22f590a]::interface::run_compiler<core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>, rustc_driver_impl[f047c15e8130c94f]::run_compiler::{closure#0}>::{closure#0}, core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>>::{closure#0}, core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[cfe0013222fec553]::result::Result<(), rustc_span[27037ef1f63d3fc0]::ErrorGuaranteed>>::{closure#2} as core[cfe0013222fec553]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  43:     0x7f75db29089b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5913e9e2478013f2
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/alloc/src/boxed.rs:2018:9
  44:     0x7f75db29089b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc7951dd75ee74cd3
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/alloc/src/boxed.rs:2018:9
  45:     0x7f75db29089b - std::sys::pal::unix::thread::Thread::new::thread_start::h59778d43da0379b7
                               at /rustc/f3c66088610c1b80110297c2d9a8b5f9265b013f/library/std/src/sys/pal/unix/thread.rs:108:17
  46:     0x7f75d4aa955a - <unknown>
  47:     0x7f75d4b26a3c - <unknown>
  48:                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 1.79.0-nightly (f3c660886 2024-04-14) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z mir-opt-level=5 -Z polymorphize=on -Z dump-mir-dir=dir

query stack during panic:
#0 [optimized_mir] optimizing MIR for `<impl at /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:19:1: 19:25>::tokenize`
#1 [unused_generic_params] determining which generic parameters are unused by `<impl at /tmp/icemaker_global_tempdir.iy1H39B5cCGu/rustc_testrunner_tmpdir_reporting.szJD7axysECi/mvce.rs:19:1: 19:25>::tokenize`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 11 previous errors

Some errors have detailed explanations: E0107, E0124, E0392, E0412, E0601.
For more information about an error, try `rustc --explain E0107`.

[matthiaskrgr]

Another one for #120550

[Noratrieb]

would be great if someone could minimize it further (remove as many of the errors as possible, I doubt all of them are necessary)

[Luk-ESC]

Minimized further:

struct NonNull<T>(*mut T);

struct Token<T> {
    ptr: *mut T,
    ptr: NonNull<T>,
    _extra_field: ()
}

fn tokenize<T>(item: *mut T) -> Token<T> {
    Token {
        ptr: NonNull(item),
        _extra_field: ()
    }
}

[adwinwhite]

Cannot reproduce. May be fixed by #126045.