ICE: Can't write value with incompatible type

[matthiaskrgr]

snippet:

#![feature(adt_const_params, coroutines, coroutine_trait)]

use std::ops::Coroutine;
use std::pin::Pin;

fn main() {
    GenericStruct::<i32, i32>::impl_function();

    // Closure
    let closure = || TestStruct1;
    closure();
}

struct TestStruct1;

struct GenericStruct<T1, T2>(std::marker::PhantomData<(T1, T2)>);

impl<T1, T2> GenericStruct<T1, T2> {
    pub fn impl_function() {
        // Closure
        let closure = || TestStruct1;
        closure();

        let mut coroutine = || {
            yield;
            return;
        };
        Pin::new(&mut coroutine).resume(());
    }
}

Version information

rustc 1.76.0-nightly (739d55682 2023-11-22)
binary: rustc
commit-hash: 739d55682659e4a81db6fd83f52b2491505030ea
commit-date: 2023-11-22
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.5

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zpolymorphize=on -Zcodegen-backend=cranelift

Program output

warning: the feature `adt_const_params` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /tmp/icemaker_global_tempdir.P7Hp73Jhct5x/rustc_testrunner_tmpdir_reporting.djVsk4t1fURb/mvce.rs:1:12
  |
1 | #![feature(adt_const_params, coroutines, coroutine_trait)]
  |            ^^^^^^^^^^^^^^^^
  |
  = note: see issue #95174 <https://github.com/rust-lang/rust/issues/95174> for more information
  = note: `#[warn(incomplete_features)]` on by default

thread 'rustc' panicked at src/abi/pass_mode.rs:221:5:
assertion `left == right` failed: Can't write value with incompatible type Coroutine(DefId(0:19 ~ mvce[cafd]::{impl#0}::impl_function::{closure#1}), [i32, i32, (), (), (), CoroutineWitness(DefId(0:19 ~ mvce[cafd]::{impl#0}::impl_function::{closure#1}), [i32, i32]), ()], Movable) to place with type Coroutine(DefId(0:19 ~ mvce[cafd]::{impl#0}::impl_function::{closure#1}), [T1/#0, T2/#1, (), (), (), CoroutineWitness(DefId(0:19 ~ mvce[cafd]::{impl#0}::impl_function::{closure#1}), [T1/#0, T2/#1]), ()], Movable)

[i32, i32]
[CPlace { inner: Addr(Pointer { base: Dangling(Align(8 bytes)), offset: Offset32(0) }, None), layout: TyAndLayout { ty: (), layout: Layout { size: Size(0 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [], memory_index: [] }, largest_niche: None, variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) } } }, CPlace { inner: Addr(Pointer { base: Dangling(Align(8 bytes)), offset: Offset32(0) }, None), layout: TyAndLayout { ty: {closure@/tmp/icemaker_global_tempdir.P7Hp73Jhct5x/rustc_testrunner_tmpdir_reporting.djVsk4t1fURb/mvce.rs:21:23: 21:25}, layout: Layout { size: Size(0 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [], memory_index: [] }, largest_niche: None, variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) } } }, CPlace { inner: Addr(Pointer { base: Dangling(Align(8 bytes)), offset: Offset32(0) }, None), layout: TyAndLayout { ty: TestStruct1, layout: Layout { size: Size(0 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [], memory_index: [] }, largest_niche: None, variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) } } }, CPlace { inner: Var(_3, var0), layout: TyAndLayout { ty: &{closure@/tmp/icemaker_global_tempdir.P7Hp73Jhct5x/rustc_testrunner_tmpdir_reporting.djVsk4t1fURb/mvce.rs:21:23: 21:25}, layout: Layout { size: Size(8 bytes), align: AbiAndPrefAlign { abi: Align(8 bytes), pref: Align(8 bytes) }, abi: Scalar(Initialized { value: Pointer(AddressSpace(0)), valid_range: 1..=18446744073709551615 }), fields: Primitive, largest_niche: Some(Niche { offset: Size(0 bytes), value: Pointer(AddressSpace(0)), valid_range: 1..=18446744073709551615 }), variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(8 bytes) } } }, CPlace { inner: Addr(Pointer { base: Stack(ss0), offset: Offset32(0) }, None), layout: TyAndLayout { ty: {coroutine@/tmp/icemaker_global_tempdir.P7Hp73Jhct5x/rustc_testrunner_tmpdir_reporting.djVsk4t1fURb/mvce.rs:24:29: 24:31}, layout: Layout { size: Size(1 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [Size(0 bytes)], memory_index: [0] }, largest_niche: Some(Niche { offset: Size(0 bytes), value: Int(I8, false), valid_range: 0..=3 }), variants: Multiple { tag: Initialized { value: Int(I8, false), valid_range: 0..=3 }, tag_encoding: Direct, tag_field: 0, variants: [Layout { size: Size(1 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [], memory_index: [] }, largest_niche: None, variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) }, Layout { size: Size(1 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [], memory_index: [] }, largest_niche: None, variants: Single { index: 1 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) }, Layout { size: Size(1 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [], memory_index: [] }, largest_niche: None, variants: Single { index: 2 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) }, Layout { size: Size(1 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [], memory_index: [] }, largest_niche: None, variants: Single { index: 3 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) }] }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) } } }, CPlace { inner: Addr(Pointer { base: Stack(ss1), offset: Offset32(0) }, None), layout: TyAndLayout { ty: CoroutineState<(), ()>, layout: Layout { size: Size(1 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Scalar(Initialized { value: Int(I8, false), valid_range: 0..=1 }), fields: Arbitrary { offsets: [Size(0 bytes)], memory_index: [0] }, largest_niche: Some(Niche { offset: Size(0 bytes), value: Int(I8, false), valid_range: 0..=1 }), variants: Multiple { tag: Initialized { value: Int(I8, false), valid_range: 0..=1 }, tag_encoding: Direct, tag_field: 0, variants: [Layout { size: Size(1 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Scalar(Initialized { value: Int(I8, false), valid_range: 0..=1 }), fields: Arbitrary { offsets: [Size(1 bytes)], memory_index: [0] }, largest_niche: None, variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) }, Layout { size: Size(1 bytes), align: AbiAndPrefAlign { abi: Align(1 bytes), pref: Align(8 bytes) }, abi: Scalar(Initialized { value: Int(I8, false), valid_range: 0..=1 }), fields: Arbitrary { offsets: [Size(1 bytes)], memory_index: [0] }, largest_niche: None, variants: Single { index: 1 }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) }] }, max_repr_align: None, unadjusted_abi_align: Align(1 bytes) } } }, CPlace { inner: Addr(Pointer { base: Stack(ss2), offset: Offset32(0) }, None), layout: TyAndLayout { ty: Pin<&mut {coroutine@/tmp/icemaker_global_tempdir.P7Hp73Jhct5x/rustc_testrunner_tmpdir_reporting.djVsk4t1fURb/mvce.rs:24:29: 24:31}>, layout: Layout { size: Size(8 bytes), align: AbiAndPrefAlign { abi: Align(8 bytes), pref: Align(8 bytes) }, abi: Scalar(Initialized { value: Pointer(AddressSpace(0)), valid_range: 1..=18446744073709551615 }), fields: Arbitrary { offsets: [Size(0 bytes)], memory_index: [0] }, largest_niche: Some(Niche { offset: Size(0 bytes), value: Pointer(AddressSpace(0)), valid_range: 1..=18446744073709551615 }), variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(8 bytes) } } }, CPlace { inner: Var(_7, var1), layout: TyAndLayout { ty: &mut {coroutine@/tmp/icemaker_global_tempdir.P7Hp73Jhct5x/rustc_testrunner_tmpdir_reporting.djVsk4t1fURb/mvce.rs:24:29: 24:31}, layout: Layout { size: Size(8 bytes), align: AbiAndPrefAlign { abi: Align(8 bytes), pref: Align(8 bytes) }, abi: Scalar(Initialized { value: Pointer(AddressSpace(0)), valid_range: 1..=18446744073709551615 }), fields: Primitive, largest_niche: Some(Niche { offset: Size(0 bytes), value: Pointer(AddressSpace(0)), valid_range: 1..=18446744073709551615 }), variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(8 bytes) } } }]

function u0:12() system_v {
    ss0 = explicit_slot 16
    ss1 = explicit_slot 16
    ss2 = explicit_slot 16
    sig0 = (i64) system_v
    sig1 = (i64) -> i64 system_v
    sig2 = (i64) -> i8 system_v
    fn0 = colocated u0:13 sig0
    fn1 = colocated u0:6 sig1
    fn2 = colocated u0:14 sig2

block0:
    nop 
    jump block1

block1:
    nop 
    v0 = iconst.i64 8
    call fn0(v0)  ; v0 = 8
    jump block2

block2:
    nop 
    v1 = iconst.i8 0
    stack_store v1, ss0  ; v1 = 0
    v2 = stack_addr.i64 ss0
    v3 = call fn1(v2)
    stack_store v3, ss2
    jump block3

block3:
    nop 
}


  left: Coroutine(DefId(0:19 ~ mvce[cafd]::{impl#0}::impl_function::{closure#1}), [i32, i32, (), (), (), CoroutineWitness(DefId(0:19 ~ mvce[cafd]::{impl#0}::impl_function::{closure#1}), [i32, i32]), ()], Movable)
 right: Coroutine(DefId(0:19 ~ mvce[cafd]::{impl#0}::impl_function::{closure#1}), [T1/#0, T2/#1, (), (), (), CoroutineWitness(DefId(0:19 ~ mvce[cafd]::{impl#0}::impl_function::{closure#1}), [T1/#0, T2/#1]), ()], Movable)
stack backtrace:
   0:     0x7f1bc038aafc - std::backtrace_rs::backtrace::libunwind::trace::hdd99412eaf13ca97
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f1bc038aafc - std::backtrace_rs::backtrace::trace_unsynchronized::h1f1df4c313dbe1c3
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f1bc038aafc - std::sys_common::backtrace::_print_fmt::h1ad713b770c28acc
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f1bc038aafc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0dda65360afed24d
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f1bc03ddc80 - core::fmt::rt::Argument::fmt::h566cd6272da8873e
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/core/src/fmt/rt.rs:142:9
   5:     0x7f1bc03ddc80 - core::fmt::write::h2788119addd26744
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f1bc037e9af - std::io::Write::write_fmt::h8d10386af4d8151e
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/io/mod.rs:1762:15
   7:     0x7f1bc038a8e4 - std::sys_common::backtrace::_print::h1feaac9889d696b8
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f1bc038a8e4 - std::sys_common::backtrace::print::h7dc96e4a48e84da8
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f1bc038d577 - std::panicking::default_hook::{{closure}}::h1d54e187062bebc3
  10:     0x7f1bc038d2df - std::panicking::default_hook::h05d19a5a0b9d9910
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/panicking.rs:292:9
  11:     0x7f1bc30f37e0 - std[6f3898e8c87bd7ff]::panicking::update_hook::<alloc[78dbdfc40e6e7b27]::boxed::Box<rustc_driver_impl[83f0b3fb8e850017]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f1bc038dcb8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h8185fc714826c3ad
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/alloc/src/boxed.rs:2021:9
  13:     0x7f1bc038dcb8 - std::panicking::rust_panic_with_hook::h6acfd9a9aa64c3be
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/panicking.rs:783:13
  14:     0x7f1bc038da0e - std::panicking::begin_panic_handler::{{closure}}::ha6f952772803f55f
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/panicking.rs:657:13
  15:     0x7f1bc038afc6 - std::sys_common::backtrace::__rust_end_short_backtrace::hc30e18b3c4279ee2
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f1bc038d772 - rust_begin_unwind
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/panicking.rs:645:5
  17:     0x7f1bc03da365 - core::panicking::panic_fmt::h4196180d8f686081
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/core/src/panicking.rs:72:14
  18:     0x7f1bc03da9c1 - core::panicking::assert_failed_inner::h4cbe769fe7511016
  19:     0x7f1bb69b647f - core[2feb293b23a7df61]::panicking::assert_failed::<rustc_middle[7992438648c2e2f8]::ty::Ty, rustc_middle[7992438648c2e2f8]::ty::Ty>
  20:     0x7f1bb6a4cac2 - rustc_codegen_cranelift[7be5e50b9264a0ba]::value_and_place::assert_assignable
  21:     0x7f1bb6a4bf38 - rustc_codegen_cranelift[7be5e50b9264a0ba]::value_and_place::assert_assignable
  22:     0x7f1bb69f202b - rustc_codegen_cranelift[7be5e50b9264a0ba]::abi::pass_mode::adjust_arg_for_abi
  23:     0x7f1bb69e7453 - <core[2feb293b23a7df61]::iter::adapters::chain::Chain<core[2feb293b23a7df61]::iter::adapters::chain::Chain<core[2feb293b23a7df61]::option::IntoIter<cranelift_codegen[10832528869623d1]::ir::entities::Value>, core[2feb293b23a7df61]::option::IntoIter<cranelift_codegen[10832528869623d1]::ir::entities::Value>>, core[2feb293b23a7df61]::iter::adapters::flatten::FlatMap<core[2feb293b23a7df61]::iter::adapters::skip::Skip<core[2feb293b23a7df61]::iter::adapters::enumerate::Enumerate<alloc[78dbdfc40e6e7b27]::vec::into_iter::IntoIter<rustc_codegen_cranelift[7be5e50b9264a0ba]::abi::CallArgument>>>, smallvec[de4025a24e926840]::IntoIter<[cranelift_codegen[10832528869623d1]::ir::entities::Value; 2usize]>, rustc_codegen_cranelift[7be5e50b9264a0ba]::abi::codegen_terminator_call::{closure#4}::{closure#0}>> as core[2feb293b23a7df61]::iter::traits::iterator::Iterator>::next
  24:     0x7f1bb69f95cf - rustc_codegen_cranelift[7be5e50b9264a0ba]::abi::codegen_terminator_call
  25:     0x7f1bb6a01f4d - rustc_codegen_cranelift[7be5e50b9264a0ba]::base::codegen_fn_body
  26:     0x7f1bb6a17774 - rustc_codegen_cranelift[7be5e50b9264a0ba]::driver::aot::module_codegen::{closure#0}
  27:     0x7f1bb6a14a85 - rustc_codegen_cranelift[7be5e50b9264a0ba]::driver::aot::module_codegen
  28:     0x7f1bb6a2108c - rustc_codegen_cranelift[7be5e50b9264a0ba]::driver::aot::run_aot
  29:     0x7f1bb6a4d3da - <rustc_codegen_cranelift[7be5e50b9264a0ba]::CraneliftCodegenBackend as rustc_codegen_ssa[e34bdd8235ee801f]::traits::backend::CodegenBackend>::codegen_crate
  30:     0x7f1bc4d4ed57 - rustc_interface[3b5e8f3f619d352f]::passes::start_codegen
  31:     0x7f1bc4d4e729 - <rustc_interface[3b5e8f3f619d352f]::queries::Queries>::ongoing_codegen
  32:     0x7f1bc5415947 - rustc_interface[3b5e8f3f619d352f]::interface::run_compiler::<core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>, rustc_driver_impl[83f0b3fb8e850017]::run_compiler::{closure#0}>::{closure#0}
  33:     0x7f1bc53a6114 - std[6f3898e8c87bd7ff]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[3b5e8f3f619d352f]::util::run_in_thread_with_globals<rustc_interface[3b5e8f3f619d352f]::util::run_in_thread_pool_with_globals<rustc_interface[3b5e8f3f619d352f]::interface::run_compiler<core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>, rustc_driver_impl[83f0b3fb8e850017]::run_compiler::{closure#0}>::{closure#0}, core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>>::{closure#0}, core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>>
  34:     0x7f1bc53a5f3d - <<std[6f3898e8c87bd7ff]::thread::Builder>::spawn_unchecked_<rustc_interface[3b5e8f3f619d352f]::util::run_in_thread_with_globals<rustc_interface[3b5e8f3f619d352f]::util::run_in_thread_pool_with_globals<rustc_interface[3b5e8f3f619d352f]::interface::run_compiler<core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>, rustc_driver_impl[83f0b3fb8e850017]::run_compiler::{closure#0}>::{closure#0}, core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>>::{closure#0}, core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2feb293b23a7df61]::result::Result<(), rustc_span[4c1ba234228835d]::ErrorGuaranteed>>::{closure#1} as core[2feb293b23a7df61]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  35:     0x7f1bc0397b75 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb2144691085ad32b
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/alloc/src/boxed.rs:2007:9
  36:     0x7f1bc0397b75 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf94bff3cb4476bdb
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/alloc/src/boxed.rs:2007:9
  37:     0x7f1bc0397b75 - std::sys::unix::thread::Thread::new::thread_start::hde682e6c21a35c03
                               at /rustc/739d55682659e4a81db6fd83f52b2491505030ea/library/std/src/sys/unix/thread.rs:108:17
  38:     0x7f1bc01539eb - <unknown>
  39:     0x7f1bc01d77cc - <unknown>
  40:                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: rustc 1.76.0-nightly (739d55682 2023-11-22) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z polymorphize=on -Z codegen-backend=cranelift -Z dump-mir-dir=dir

query stack during panic:
end of query stack
warning: 1 warning emitted

[bjorn3]

Reduced to

#![feature(coroutines, coroutine_trait)]

use std::ops::Coroutine;
use std::pin::Pin;

fn main() {
    run_coroutine::<i32>();
}

fn run_coroutine<T>() {
    let mut coroutine = || {
        yield;
        return;
    };
    Pin::new(&mut coroutine).resume(());
}

[bjorn3]

What is happening here is that coroutine has a type with the type parameter T substituted with i32, while Coroutine::resume for it expects the self parameter to have T be polymorphized, thus causing an assignment of a coroutine value with T=i32 to a place with T=T/#0 (a type parameter). The assert_assignable check rejects this as it didn't recurse into Coroutine and CoroutineWitness to hit the code path where assigning any type to a type parameter (and vice versa) is allowed when polymorphization is enabled.