ICE: "rust-call" ABI does not support unsized params

[matthiaskrgr]

Code

While the original #67981 seem fixed, this modification seems to still crash.

#![feature(unsized_fn_params)]

fn main() {
    let f: fn([u8]) = |_result| {};
    
    let slice: Box<[u8]> = Box::new([1; 8]);
    
    f(*slice);
}

Meta

rustc --version --verbose:

rustc 1.72.0-nightly (df77afbca 2023-06-12)
binary: rustc
commit-hash: df77afbcaf3365a32066a8ca4a00ae6fc9a69647
commit-date: 2023-06-12
host: x86_64-unknown-linux-gnu
release: 1.72.0-nightly
LLVM version: 16.0.5

Error output

<output>

Backtrace

error: internal compiler error: /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/compiler/rustc_codegen_ssa/src/mir/mod.rs:308:21: "rust-call" ABI does not support unsized params
   --> /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
    |
250 |     extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/compiler/rustc_errors/src/lib.rs:994:33
stack backtrace:
   0:     0x7f4d5e768c41 - std::backtrace_rs::backtrace::libunwind::trace::hd830ec006d66d7bd
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f4d5e768c41 - std::backtrace_rs::backtrace::trace_unsynchronized::ha48a9544f0edee03
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f4d5e768c41 - std::sys_common::backtrace::_print_fmt::had4ddaa258f461e3
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f4d5e768c41 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he768f658e406b581
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f4d5e7c95ff - core::fmt::rt::Argument::fmt::h10ce9a0440e62ef5
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/core/src/fmt/rt.rs:138:9
   5:     0x7f4d5e7c95ff - core::fmt::write::h381a5b53ed990481
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f4d5e75be41 - std::io::Write::write_fmt::h6f7ffab47f774bac
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/io/mod.rs:1713:15
   7:     0x7f4d5e768a55 - std::sys_common::backtrace::_print::h6b3b514a9c0bb2a1
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f4d5e768a55 - std::sys_common::backtrace::print::h4d04f57fcaaadbf7
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f4d5e76b737 - std::panicking::default_hook::{{closure}}::h82f2d8896eabc353
  10:     0x7f4d5e76b524 - std::panicking::default_hook::h1d70e3392ff8715d
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/panicking.rs:288:9
  11:     0x7f4d619eb80b - rustc_driver_impl[bc9e93faacc37431]::install_ice_hook::{closure#0}
  12:     0x7f4d5e76be7d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hdeb68781aec8c01b
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/alloc/src/boxed.rs:1999:9
  13:     0x7f4d5e76be7d - std::panicking::rust_panic_with_hook::h411bd05f08be05b6
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/panicking.rs:709:13
  14:     0x7f4d6187f0e1 - std[74cc9e3c59aa80ae]::panicking::begin_panic::<rustc_errors[c5ec46bf3b0ea9c2]::ExplicitBug>::{closure#0}
  15:     0x7f4d6187d8a6 - std[74cc9e3c59aa80ae]::sys_common::backtrace::__rust_end_short_backtrace::<std[74cc9e3c59aa80ae]::panicking::begin_panic<rustc_errors[c5ec46bf3b0ea9c2]::ExplicitBug>::{closure#0}, !>
  16:     0x7f4d61831c66 - std[74cc9e3c59aa80ae]::panicking::begin_panic::<rustc_errors[c5ec46bf3b0ea9c2]::ExplicitBug>
  17:     0x7f4d61830222 - <rustc_errors[c5ec46bf3b0ea9c2]::HandlerInner>::span_bug::<rustc_span[bc106c13571faf85]::span_encoding::Span, alloc[87cbe4d25bb98c8e]::string::String>
  18:     0x7f4d6182ff06 - <rustc_errors[c5ec46bf3b0ea9c2]::Handler>::span_bug::<rustc_span[bc106c13571faf85]::span_encoding::Span, alloc[87cbe4d25bb98c8e]::string::String>
  19:     0x7f4d6187092d - rustc_middle[111bd832a8dd3e9b]::util::bug::opt_span_bug_fmt::<rustc_span[bc106c13571faf85]::span_encoding::Span>::{closure#0}
  20:     0x7f4d6187095a - rustc_middle[111bd832a8dd3e9b]::ty::context::tls::with_opt::<rustc_middle[111bd832a8dd3e9b]::util::bug::opt_span_bug_fmt<rustc_span[bc106c13571faf85]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f4d6187025a - rustc_middle[111bd832a8dd3e9b]::ty::context::tls::with_context_opt::<rustc_middle[111bd832a8dd3e9b]::ty::context::tls::with_opt<rustc_middle[111bd832a8dd3e9b]::util::bug::opt_span_bug_fmt<rustc_span[bc106c13571faf85]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f4d603615c4 - rustc_middle[111bd832a8dd3e9b]::util::bug::span_bug_fmt::<rustc_span[bc106c13571faf85]::span_encoding::Span>
  23:     0x7f4d60323cfb - <core[7eaf5f0da9577636]::iter::adapters::map::Map<core[7eaf5f0da9577636]::iter::adapters::enumerate::Enumerate<core[7eaf5f0da9577636]::iter::adapters::map::Map<core[7eaf5f0da9577636]::ops::range::Range<usize>, <rustc_middle[111bd832a8dd3e9b]::mir::Local as rustc_index[b646ff7bb36439aa]::idx::Idx>::new>>, rustc_codegen_ssa[ad8ce12ca4f75ed5]::mir::arg_local_refs<rustc_codegen_llvm[78f40839ab5d6bee]::builder::Builder>::{closure#0}> as core[7eaf5f0da9577636]::iter::traits::iterator::Iterator>::fold::<(), core[7eaf5f0da9577636]::iter::traits::iterator::Iterator::for_each::call<rustc_codegen_ssa[ad8ce12ca4f75ed5]::mir::LocalRef<&rustc_codegen_llvm[78f40839ab5d6bee]::llvm_::ffi::Value>, <alloc[87cbe4d25bb98c8e]::vec::Vec<rustc_codegen_ssa[ad8ce12ca4f75ed5]::mir::LocalRef<&rustc_codegen_llvm[78f40839ab5d6bee]::llvm_::ffi::Value>>>::extend_trusted<core[7eaf5f0da9577636]::iter::adapters::map::Map<core[7eaf5f0da9577636]::iter::adapters::enumerate::Enumerate<core[7eaf5f0da9577636]::iter::adapters::map::Map<core[7eaf5f0da9577636]::ops::range::Range<usize>, <rustc_middle[111bd832a8dd3e9b]::mir::Local as rustc_index[b646ff7bb36439aa]::idx::Idx>::new>>, rustc_codegen_ssa[ad8ce12ca4f75ed5]::mir::arg_local_refs<rustc_codegen_llvm[78f40839ab5d6bee]::builder::Builder>::{closure#0}>>::{closure#0}>::{closure#0}>
  24:     0x7f4d60339cc2 - rustc_codegen_ssa[ad8ce12ca4f75ed5]::mir::codegen_mir::<rustc_codegen_llvm[78f40839ab5d6bee]::builder::Builder>
  25:     0x7f4d60f5e832 - rustc_codegen_llvm[78f40839ab5d6bee]::base::compile_codegen_unit::module_codegen
  26:     0x7f4d60f5cff5 - rustc_codegen_llvm[78f40839ab5d6bee]::base::compile_codegen_unit
  27:     0x7f4d60ed06b7 - rustc_codegen_ssa[ad8ce12ca4f75ed5]::base::codegen_crate::<rustc_codegen_llvm[78f40839ab5d6bee]::LlvmCodegenBackend>
  28:     0x7f4d60ecff9f - <rustc_codegen_llvm[78f40839ab5d6bee]::LlvmCodegenBackend as rustc_codegen_ssa[ad8ce12ca4f75ed5]::traits::backend::CodegenBackend>::codegen_crate
  29:     0x7f4d60cb5a82 - <rustc_session[6c3c6789374dfdb7]::session::Session>::time::<alloc[87cbe4d25bb98c8e]::boxed::Box<dyn core[7eaf5f0da9577636]::any::Any>, rustc_interface[ec6df654b897cc82]::passes::start_codegen::{closure#0}>
  30:     0x7f4d60cb55cb - rustc_interface[ec6df654b897cc82]::passes::start_codegen
  31:     0x7f4d60cafcdd - <rustc_middle[111bd832a8dd3e9b]::ty::context::GlobalCtxt>::enter::<<rustc_interface[ec6df654b897cc82]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[7eaf5f0da9577636]::result::Result<alloc[87cbe4d25bb98c8e]::boxed::Box<dyn core[7eaf5f0da9577636]::any::Any>, rustc_span[bc106c13571faf85]::ErrorGuaranteed>>
  32:     0x7f4d60caf14d - <rustc_interface[ec6df654b897cc82]::queries::Queries>::ongoing_codegen
  33:     0x7f4d60cae723 - <rustc_interface[ec6df654b897cc82]::interface::Compiler>::enter::<rustc_driver_impl[bc9e93faacc37431]::run_compiler::{closure#1}::{closure#2}, core[7eaf5f0da9577636]::result::Result<core[7eaf5f0da9577636]::option::Option<rustc_interface[ec6df654b897cc82]::queries::Linker>, rustc_span[bc106c13571faf85]::ErrorGuaranteed>>
  34:     0x7f4d60cac289 - <scoped_tls[ada14302b38d1f15]::ScopedKey<rustc_span[bc106c13571faf85]::SessionGlobals>>::set::<rustc_interface[ec6df654b897cc82]::interface::run_compiler<core[7eaf5f0da9577636]::result::Result<(), rustc_span[bc106c13571faf85]::ErrorGuaranteed>, rustc_driver_impl[bc9e93faacc37431]::run_compiler::{closure#1}>::{closure#0}, core[7eaf5f0da9577636]::result::Result<(), rustc_span[bc106c13571faf85]::ErrorGuaranteed>>
  35:     0x7f4d60cab6f6 - std[74cc9e3c59aa80ae]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ec6df654b897cc82]::util::run_in_thread_pool_with_globals<rustc_interface[ec6df654b897cc82]::interface::run_compiler<core[7eaf5f0da9577636]::result::Result<(), rustc_span[bc106c13571faf85]::ErrorGuaranteed>, rustc_driver_impl[bc9e93faacc37431]::run_compiler::{closure#1}>::{closure#0}, core[7eaf5f0da9577636]::result::Result<(), rustc_span[bc106c13571faf85]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[7eaf5f0da9577636]::result::Result<(), rustc_span[bc106c13571faf85]::ErrorGuaranteed>>
  36:     0x7f4d60cab4a5 - <<std[74cc9e3c59aa80ae]::thread::Builder>::spawn_unchecked_<rustc_interface[ec6df654b897cc82]::util::run_in_thread_pool_with_globals<rustc_interface[ec6df654b897cc82]::interface::run_compiler<core[7eaf5f0da9577636]::result::Result<(), rustc_span[bc106c13571faf85]::ErrorGuaranteed>, rustc_driver_impl[bc9e93faacc37431]::run_compiler::{closure#1}>::{closure#0}, core[7eaf5f0da9577636]::result::Result<(), rustc_span[bc106c13571faf85]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[7eaf5f0da9577636]::result::Result<(), rustc_span[bc106c13571faf85]::ErrorGuaranteed>>::{closure#1} as core[7eaf5f0da9577636]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x7f4d5e7763a5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5622047e08c7cdf0
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/alloc/src/boxed.rs:1985:9
  38:     0x7f4d5e7763a5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5e7463f2383057fb
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/alloc/src/boxed.rs:1985:9
  39:     0x7f4d5e7763a5 - std::sys::unix::thread::Thread::new::thread_start::h5c3763b970acc3be
                               at /rustc/df77afbcaf3365a32066a8ca4a00ae6fc9a69647/library/std/src/sys/unix/thread.rs:108:17
  40:     0x7f4d5e50f44b - <unknown>
  41:     0x7f4d5e592e40 - <unknown>
  42:                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: rustc 1.72.0-nightly (df77afbca 2023-06-12) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
error: aborting due to previous error