ice: `cast_to.ty.is_unsafe_ptr()`

[matthiaskrgr]

auto-reduced (treereduce-rust):

static FOO: fn() = || assert_ne!(42, 43);
static BAR: fn(i32, i32) = |a, b| assert_ne!(a, b);

fn main() {
    FOO();

    let bar: unsafe fn(i32, i32) = BAR;

    let f: fn() = || {};
    f();

    f();

    f();

    let g: fn(i32) = |i| assert_eq!(i, 2);
    g(2);

    g(2);

    g(2);
}

original:

static FOO: fn() = || assert_ne!(42, 43);
static BAR: fn(i32, i32) = |a, b| assert_ne!(a, b);

// use to first make the closure FnOnce() before making it fn()
fn force_once0<R, F: FnOnce() -> R>(f: F) -> F {
    f
}
fn force_once1<T, R, F: FnOnce(T) -> R>(f: F) -> F {
    f
}
fn force_mut0<R, F: FnMut() -> R>(f: F) -> F {
    f
}
fn force_mut1<T, R, F: FnMut(T) -> R>(f: F) -> F {
    f
}

fn main() {
    FOO();
    BAR(44, 45);
    let bar: unsafe fn(i32, i32) = BAR;
    unsafe { bar(46, 47) };
    let boo: &dyn Fn(i32, i32) = &BAR;
    boo(48, 49);

    let f: fn() = || {};
    f();
    let f = force_once0(|| {}) as fn();
    f();
    let f = force_mut0(|| {}) as fn();
    f();

    let g: fn(i32) = |i| assert_eq!(i, 2);
    g(2);
    let g = force_once1(|i| assert_eq!(i, 2)) as fn(i32);
    g(2);
    let g = force_mut1(|i| assert_eq!(i, 2)) as fn(i32);
    g(2);
}

Version information

rustc 1.78.0-nightly (9aa232ecc 2024-02-11)
binary: rustc
commit-hash: 9aa232ecc7bb006a1fad404f437b049482021a3a
commit-date: 2024-02-11
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 17.0.6

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

Program output

warning: unused variable: `bar`
 --> /tmp/icemaker_global_tempdir.tkO1egN3Uvx5/rustc_testrunner_tmpdir_reporting.BMSxZ0VHemue/mvce.rs:7:9
  |
7 |     let bar: unsafe fn(i32, i32) = BAR;
  |         ^^^ help: if this is intentional, prefix it with an underscore: `_bar`
  |
  = note: `#[warn(unused_variables)]` on by default

thread 'rustc' panicked at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/compiler/rustc_const_eval/src/interpret/cast.rs:203:9:
assertion failed: cast_to.ty.is_unsafe_ptr()
stack backtrace:
   0:     0x7f7c9d986416 - std::backtrace_rs::backtrace::libunwind::trace::haa332446d2816da1
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f7c9d986416 - std::backtrace_rs::backtrace::trace_unsynchronized::hc79ac4bb87de99b7
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f7c9d986416 - std::sys_common::backtrace::_print_fmt::h826e31038d6fed55
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f7c9d986416 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h7d45101adaea8e2e
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f7c9d9d8f90 - core::fmt::rt::Argument::fmt::habb091c2e565929c
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/core/src/fmt/rt.rs:142:9
   5:     0x7f7c9d9d8f90 - core::fmt::write::h430cd915198bfbfa
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f7c9d979c9f - std::io::Write::write_fmt::h76a4f85596572687
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/io/mod.rs:1854:15
   7:     0x7f7c9d9861f4 - std::sys_common::backtrace::_print::h730103227e62d0c1
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f7c9d9861f4 - std::sys_common::backtrace::print::h4b37a0052f447bb6
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f7c9d988fe7 - std::panicking::default_hook::{{closure}}::h9ce01cf4995c297e
  10:     0x7f7c9d988d49 - std::panicking::default_hook::h82708ac75720d681
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/panicking.rs:292:9
  11:     0x7f7c9a74999c - std[2504e1f5e79dbd0a]::panicking::update_hook::<alloc[4e175fcaaf6bf4c3]::boxed::Box<rustc_driver_impl[f5849ce36d1a60d2]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f7c9d989736 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h9c044ab60f052747
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/alloc/src/boxed.rs:2030:9
  13:     0x7f7c9d989736 - std::panicking::rust_panic_with_hook::h47b07230e93314a2
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/panicking.rs:785:13
  14:     0x7f7c9d989449 - std::panicking::begin_panic_handler::{{closure}}::h6c5fbc890ce207d0
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/panicking.rs:651:13
  15:     0x7f7c9d986916 - std::sys_common::backtrace::__rust_end_short_backtrace::hec2f82c01fee32cd
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f7c9d9891d4 - rust_begin_unwind
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/panicking.rs:647:5
  17:     0x7f7c9d9d56e5 - core::panicking::panic_fmt::h48a1a0d3500755c9
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/core/src/panicking.rs:72:14
  18:     0x7f7c9d9d57a3 - core::panicking::panic::h38ca9e7edcd01163
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/core/src/panicking.rs:144:5
  19:     0x7f7c9c29e56c - <rustc_mir_transform[156c0abd78acfd74]::gvn::VnState>::insert
  20:     0x7f7c9c0601a5 - <rustc_mir_transform[156c0abd78acfd74]::gvn::VnState>::simplify_rvalue
  21:     0x7f7c9999ae61 - <rustc_mir_transform[156c0abd78acfd74]::gvn::GVN as rustc_middle[dddd7df0b25e8df]::mir::MirPass>::run_pass
  22:     0x7f7c9ba10a29 - rustc_mir_transform[156c0abd78acfd74]::pass_manager::run_passes_inner
  23:     0x7f7c9bf2882a - rustc_mir_transform[156c0abd78acfd74]::optimized_mir
  24:     0x7f7c9ba7a535 - rustc_query_impl[6d1f17dd37feccf6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[6d1f17dd37feccf6]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dddd7df0b25e8df]::query::erase::Erased<[u8; 8usize]>>
  25:     0x7f7c9ba7abe1 - rustc_query_system[e40b0ad2841d92dc]::query::plumbing::try_execute_query::<rustc_query_impl[6d1f17dd37feccf6]::DynamicConfig<rustc_query_system[e40b0ad2841d92dc]::query::caches::DefIdCache<rustc_middle[dddd7df0b25e8df]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[6d1f17dd37feccf6]::plumbing::QueryCtxt, false>
  26:     0x7f7c9ba7a35e - rustc_query_impl[6d1f17dd37feccf6]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  27:     0x7f7c98a00be8 - <rustc_middle[dddd7df0b25e8df]::ty::context::TyCtxt>::instance_mir
  28:     0x7f7c995b40f1 - rustc_monomorphize[f093a8358fafe6ae]::collector::collect_items_rec::{closure#0}
  29:     0x7f7c9c8b2416 - rustc_monomorphize[f093a8358fafe6ae]::collector::collect_items_rec
  30:     0x7f7c9c8adaff - rustc_monomorphize[f093a8358fafe6ae]::partitioning::collect_and_partition_mono_items
  31:     0x7f7c9c8ad170 - rustc_query_impl[6d1f17dd37feccf6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[6d1f17dd37feccf6]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dddd7df0b25e8df]::query::erase::Erased<[u8; 24usize]>>
  32:     0x7f7c9c8ad155 - <rustc_query_impl[6d1f17dd37feccf6]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[ae955e53bd86118a]::ops::function::FnOnce<(rustc_middle[dddd7df0b25e8df]::ty::context::TyCtxt, ())>>::call_once
  33:     0x7f7c9c8ac4c7 - rustc_query_system[e40b0ad2841d92dc]::query::plumbing::try_execute_query::<rustc_query_impl[6d1f17dd37feccf6]::DynamicConfig<rustc_query_system[e40b0ad2841d92dc]::query::caches::SingleCache<rustc_middle[dddd7df0b25e8df]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[6d1f17dd37feccf6]::plumbing::QueryCtxt, false>
  34:     0x7f7c9c8ac1c9 - rustc_query_impl[6d1f17dd37feccf6]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  35:     0x7f7c9c6f0d95 - rustc_codegen_ssa[1e476fc2cbfb7ad1]::base::codegen_crate::<rustc_codegen_llvm[35c5f462c9ac856d]::LlvmCodegenBackend>
  36:     0x7f7c9c6f0a49 - <rustc_codegen_llvm[35c5f462c9ac856d]::LlvmCodegenBackend as rustc_codegen_ssa[1e476fc2cbfb7ad1]::traits::backend::CodegenBackend>::codegen_crate
  37:     0x7f7c9c97f0f0 - rustc_interface[614167ae26197186]::passes::start_codegen
  38:     0x7f7c9c97e835 - <rustc_interface[614167ae26197186]::queries::Queries>::codegen_and_build_linker
  39:     0x7f7c9c7300c5 - rustc_interface[614167ae26197186]::interface::run_compiler::<core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>, rustc_driver_impl[f5849ce36d1a60d2]::run_compiler::{closure#0}>::{closure#0}
  40:     0x7f7c9c96e0d2 - std[2504e1f5e79dbd0a]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[614167ae26197186]::util::run_in_thread_with_globals<rustc_interface[614167ae26197186]::util::run_in_thread_pool_with_globals<rustc_interface[614167ae26197186]::interface::run_compiler<core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>, rustc_driver_impl[f5849ce36d1a60d2]::run_compiler::{closure#0}>::{closure#0}, core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>>::{closure#0}, core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>>
  41:     0x7f7c9c96defe - <<std[2504e1f5e79dbd0a]::thread::Builder>::spawn_unchecked_<rustc_interface[614167ae26197186]::util::run_in_thread_with_globals<rustc_interface[614167ae26197186]::util::run_in_thread_pool_with_globals<rustc_interface[614167ae26197186]::interface::run_compiler<core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>, rustc_driver_impl[f5849ce36d1a60d2]::run_compiler::{closure#0}>::{closure#0}, core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>>::{closure#0}, core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ae955e53bd86118a]::result::Result<(), rustc_span[5816d1300c2c104a]::ErrorGuaranteed>>::{closure#1} as core[ae955e53bd86118a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  42:     0x7f7c9d992925 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3205da42e967968e
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/alloc/src/boxed.rs:2016:9
  43:     0x7f7c9d992925 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3a8d804b35a578bc
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/alloc/src/boxed.rs:2016:9
  44:     0x7f7c9d992925 - std::sys::pal::unix::thread::Thread::new::thread_start::ha87a0836a03cdbad
                               at /rustc/9aa232ecc7bb006a1fad404f437b049482021a3a/library/std/src/sys/pal/unix/thread.rs:108:17
  45:     0x7f7c978749eb - <unknown>
  46:     0x7f7c978f87cc - <unknown>
  47:                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 1.78.0-nightly (9aa232ecc 2024-02-11) running on x86_64-unknown-linux-gnu

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

query stack during panic:
#0 [optimized_mir] optimizing MIR for `main`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
warning: 1 warning emitted

[matthiaskrgr]

cc @cjgillot #120405