ICE: `unboxed closure` but only with `mir-opt-level=0`

[matthiaskrgr]

Code

from #66696
rustc -Zmir-opt-level=0 file.rs

#![feature(unboxed_closures)]
fn main() {
    unsafe { std::mem::transmute::<usize, extern "rust-call" fn()>(5); }
}

Meta

rustc --version --verbose:

rustc 1.73.0-nightly (f88a8b71c 2023-08-08)
binary: rustc
commit-hash: f88a8b71cebb730cbd5058c45ebcae1d4d9be377
commit-date: 2023-08-08
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 17.0.0

Error output

<output>

Backtrace

error: internal compiler error: compiler/rustc_ty_utils/src/abi.rs:355:13: argument to function with "rust-call" ABI is not a tuple

thread 'rustc' panicked at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/compiler/rustc_errors/src/lib.rs:1635:9:
Box<dyn Any>
stack backtrace:
   0:     0x7fb75b0dc41c - std::backtrace_rs::backtrace::libunwind::trace::hca136959d52e6933
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fb75b0dc41c - std::backtrace_rs::backtrace::trace_unsynchronized::h1c6a8e094542be1c
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fb75b0dc41c - std::sys_common::backtrace::_print_fmt::h0da2398478023750
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fb75b0dc41c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5b6a573864c0f846
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fb75b14191c - core::fmt::rt::Argument::fmt::he6fd7e0d0105a739
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/core/src/fmt/rt.rs:138:9
   5:     0x7fb75b14191c - core::fmt::write::h94f577461195b051
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/core/src/fmt/mod.rs:1094:21
   6:     0x7fb75b0cefce - std::io::Write::write_fmt::hd1a9413609baf17e
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/io/mod.rs:1714:15
   7:     0x7fb75b0dc204 - std::sys_common::backtrace::_print::h6209835ea4995823
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fb75b0dc204 - std::sys_common::backtrace::print::he714f50554d615bf
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fb75b0df2fa - std::panicking::panic_hook_with_disk_dump::{{closure}}::h3bcbb7ff457b5172
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/panicking.rs:278:22
  10:     0x7fb75b0defe7 - std::panicking::panic_hook_with_disk_dump::he69919c08bd7c189
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/panicking.rs:312:9
  11:     0x7fb759f41c99 - <rustc_driver_impl[a3b376697c1f9d40]::install_ice_hook::{closure#0} as core[5c8cf3808a1d57ad]::ops::function::FnOnce<(&core[5c8cf3808a1d57ad]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  12:     0x7fb75b0dfba0 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::ha904a5fedd1a6164
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/alloc/src/boxed.rs:2021:9
  13:     0x7fb75b0dfba0 - std::panicking::rust_panic_with_hook::h2a611f1a2fc1b8fc
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/panicking.rs:733:13
  14:     0x7fb75a4e3891 - std[daf38f5e158042c3]::panicking::begin_panic::<rustc_errors[7d56c13f6856642f]::ExplicitBug>::{closure#0}
  15:     0x7fb75a4e3636 - std[daf38f5e158042c3]::sys_common::backtrace::__rust_end_short_backtrace::<std[daf38f5e158042c3]::panicking::begin_panic<rustc_errors[7d56c13f6856642f]::ExplicitBug>::{closure#0}, !>
  16:     0x7fb75a4e3526 - std[daf38f5e158042c3]::panicking::begin_panic::<rustc_errors[7d56c13f6856642f]::ExplicitBug>
  17:     0x7fb75a4291a4 - <rustc_errors[7d56c13f6856642f]::HandlerInner>::bug::<alloc[221a7a11f5e0e716]::string::String>
  18:     0x7fb75a429036 - <rustc_errors[7d56c13f6856642f]::Handler>::bug::<alloc[221a7a11f5e0e716]::string::String>
  19:     0x7fb75a4dd41c - rustc_middle[4e39534ad143988e]::util::bug::opt_span_bug_fmt::<rustc_span[fbb5fda749e896f2]::span_encoding::Span>::{closure#0}
  20:     0x7fb75a4dc1fa - rustc_middle[4e39534ad143988e]::ty::context::tls::with_opt::<rustc_middle[4e39534ad143988e]::util::bug::opt_span_bug_fmt<rustc_span[fbb5fda749e896f2]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7fb75a4dc1c8 - rustc_middle[4e39534ad143988e]::ty::context::tls::with_context_opt::<rustc_middle[4e39534ad143988e]::ty::context::tls::with_opt<rustc_middle[4e39534ad143988e]::util::bug::opt_span_bug_fmt<rustc_span[fbb5fda749e896f2]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7fb758de4340 - rustc_middle[4e39534ad143988e]::util::bug::bug_fmt
  23:     0x7fb75888db02 - rustc_ty_utils[2b480d80ea03f19d]::abi::fn_abi_new_uncached
  24:     0x7fb75993fe5e - rustc_ty_utils[2b480d80ea03f19d]::abi::fn_abi_of_fn_ptr
  25:     0x7fb75937515d - rustc_query_impl[e5a2310130a23b66]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[e5a2310130a23b66]::query_impl::fn_abi_of_fn_ptr::dynamic_query::{closure#2}::{closure#0}, rustc_middle[4e39534ad143988e]::query::erase::Erased<[u8; 16usize]>>
  26:     0x7fb75937511a - <rustc_query_impl[e5a2310130a23b66]::query_impl::fn_abi_of_fn_ptr::dynamic_query::{closure#2} as core[5c8cf3808a1d57ad]::ops::function::FnOnce<(rustc_middle[4e39534ad143988e]::ty::context::TyCtxt, rustc_middle[4e39534ad143988e]::ty::ParamEnvAnd<(rustc_middle[4e39534ad143988e]::ty::sty::Binder<rustc_middle[4e39534ad143988e]::ty::sty::FnSig>, &rustc_middle[4e39534ad143988e]::ty::list::List<rustc_middle[4e39534ad143988e]::ty::Ty>)>)>>::call_once
  27:     0x7fb7594f65ba - rustc_query_system[f19bd4f68b2513a8]::query::plumbing::try_execute_query::<rustc_query_impl[e5a2310130a23b66]::DynamicConfig<rustc_query_system[f19bd4f68b2513a8]::query::caches::DefaultCache<rustc_middle[4e39534ad143988e]::ty::ParamEnvAnd<(rustc_middle[4e39534ad143988e]::ty::sty::Binder<rustc_middle[4e39534ad143988e]::ty::sty::FnSig>, &rustc_middle[4e39534ad143988e]::ty::list::List<rustc_middle[4e39534ad143988e]::ty::Ty>)>, rustc_middle[4e39534ad143988e]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[e5a2310130a23b66]::plumbing::QueryCtxt, false>
  28:     0x7fb7594f6287 - rustc_query_impl[e5a2310130a23b66]::query_impl::fn_abi_of_fn_ptr::get_query_non_incr::__rust_end_short_backtrace
  29:     0x7fb75826cc1f - <rustc_codegen_llvm[bf58ef99b94ec857]::context::CodegenCx as rustc_middle[4e39534ad143988e]::ty::layout::FnAbiOf>::fn_abi_of_fn_ptr
  30:     0x7fb758269899 - <rustc_target[5754b8683141b86c]::abi::TyAndLayout<rustc_middle[4e39534ad143988e]::ty::Ty> as rustc_codegen_llvm[bf58ef99b94ec857]::type_of::LayoutLlvmExt>::llvm_type
  31:     0x7fb758940adb - <rustc_codegen_ssa[845c4d9d94d655c1]::mir::FunctionCx<rustc_codegen_llvm[bf58ef99b94ec857]::builder::Builder>>::codegen_transmute_operand
  32:     0x7fb7589236ce - <rustc_codegen_ssa[845c4d9d94d655c1]::mir::FunctionCx<rustc_codegen_llvm[bf58ef99b94ec857]::builder::Builder>>::codegen_rvalue_operand
  33:     0x7fb7588f8161 - rustc_codegen_ssa[845c4d9d94d655c1]::mir::codegen_mir::<rustc_codegen_llvm[bf58ef99b94ec857]::builder::Builder>
  34:     0x7fb758d79e68 - rustc_codegen_llvm[bf58ef99b94ec857]::base::compile_codegen_unit::module_codegen
  35:     0x7fb758d76f60 - rustc_codegen_llvm[bf58ef99b94ec857]::base::compile_codegen_unit
  36:     0x7fb758d73b05 - rustc_codegen_ssa[845c4d9d94d655c1]::base::codegen_crate::<rustc_codegen_llvm[bf58ef99b94ec857]::LlvmCodegenBackend>
  37:     0x7fb758d73526 - <rustc_codegen_llvm[bf58ef99b94ec857]::LlvmCodegenBackend as rustc_codegen_ssa[845c4d9d94d655c1]::traits::backend::CodegenBackend>::codegen_crate
  38:     0x7fb7591fd982 - <rustc_session[5b68303f1d45cafc]::session::Session>::time::<alloc[221a7a11f5e0e716]::boxed::Box<dyn core[5c8cf3808a1d57ad]::any::Any>, rustc_interface[bbd54b40b3118f42]::passes::start_codegen::{closure#0}>
  39:     0x7fb7591fd4db - rustc_interface[bbd54b40b3118f42]::passes::start_codegen
  40:     0x7fb7591f70da - <rustc_middle[4e39534ad143988e]::ty::context::GlobalCtxt>::enter::<<rustc_interface[bbd54b40b3118f42]::queries::Queries>::ongoing_codegen::{closure#0}, core[5c8cf3808a1d57ad]::result::Result<alloc[221a7a11f5e0e716]::boxed::Box<dyn core[5c8cf3808a1d57ad]::any::Any>, rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>>
  41:     0x7fb7591f5f45 - rustc_span[fbb5fda749e896f2]::set_source_map::<core[5c8cf3808a1d57ad]::result::Result<(), rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>, rustc_interface[bbd54b40b3118f42]::interface::run_compiler<core[5c8cf3808a1d57ad]::result::Result<(), rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>, rustc_driver_impl[a3b376697c1f9d40]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  42:     0x7fb7591f03b0 - std[daf38f5e158042c3]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[bbd54b40b3118f42]::util::run_in_thread_pool_with_globals<rustc_interface[bbd54b40b3118f42]::interface::run_compiler<core[5c8cf3808a1d57ad]::result::Result<(), rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>, rustc_driver_impl[a3b376697c1f9d40]::run_compiler::{closure#1}>::{closure#0}, core[5c8cf3808a1d57ad]::result::Result<(), rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5c8cf3808a1d57ad]::result::Result<(), rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>>
  43:     0x7fb7597b76f5 - <<std[daf38f5e158042c3]::thread::Builder>::spawn_unchecked_<rustc_interface[bbd54b40b3118f42]::util::run_in_thread_pool_with_globals<rustc_interface[bbd54b40b3118f42]::interface::run_compiler<core[5c8cf3808a1d57ad]::result::Result<(), rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>, rustc_driver_impl[a3b376697c1f9d40]::run_compiler::{closure#1}>::{closure#0}, core[5c8cf3808a1d57ad]::result::Result<(), rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5c8cf3808a1d57ad]::result::Result<(), rustc_span[fbb5fda749e896f2]::ErrorGuaranteed>>::{closure#1} as core[5c8cf3808a1d57ad]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  44:     0x7fb75b0ea225 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he74562cf0068d98a
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/alloc/src/boxed.rs:2007:9
  45:     0x7fb75b0ea225 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h499befea8267854a
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/alloc/src/boxed.rs:2007:9
  46:     0x7fb75b0ea225 - std::sys::unix::thread::Thread::new::thread_start::h94d7dff6e38d6249
                               at /rustc/f88a8b71cebb730cbd5058c45ebcae1d4d9be377/library/std/src/sys/unix/thread.rs:108:17
  47:     0x7fb756c6444b - <unknown>
  48:     0x7fb756ce7e40 - <unknown>
  49:                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: please attach the file at `/home/matthias/vcs/github/glacier2/fixed/rustc-ice-2023-08-09T17:42:31.324359464Z-2419293.txt` to your bug report

note: compiler flags: -Z mir-opt-level=0

query stack during panic:
#0 [fn_abi_of_fn_ptr] computing call ABI of `extern "rust-call" fn()` function pointers
end of query stack
error: aborting due to previous error

[matthiaskrgr]

Regression in nightly-2020-05-27 🤔

commit[0] 2020-05-25: Auto merge of #72575 - Dylan-DPC:rollup-zo679hv, r=Dylan-DPC
commit[1] 2020-05-25: Auto merge of #72589 - Dylan-DPC:rollup-7l2a2bo, r=Dylan-DPC
commit[2] 2020-05-26: Auto merge of #71487 - rcoh:71471-shebang, r=petrochenkov
commit[3] 2020-05-26: Auto merge of #72093 - jonas-schievink:unmut, r=oli-obk
commit[4] 2020-05-26: Auto merge of #71900 - GuillaumeGomez:clean-up-rustdoc, r=ollie27,kinnison
commit[5] 2020-05-26: Auto merge of #71931 - alexcrichton:reproducible-macos, r=eddyb
ERROR: no CI builds available between f93bb2a and 5239f5c

[matthiaskrgr]

maybe #72451 ?

[bjorn3]

extern "rust-call" fn() is not a well-formed type. The last argument for extern "rust-call" needs to be a tuple. I don't think we actually check this well-formedness constraint inside typeck as we should though.