ICE: prev_args.len() == 1

[matthiaskrgr]

I tried this code:

#![feature(unboxed_closures, tuple_trait)]

extern "rust-call" fn foo<T: std::marker::Tuple>(_: T) {}

#[kani::proof]
fn main() {
    foo(());
}

using the following command line invocation:

kani file.rs

with Kani version: 0.22.0

I expected to see this happen: explanation

Instead, this happened: explanation

thread '<unnamed>' panicked at 'assertion failed: prev_args.len() == 1', kani-compiler/src/codegen_cprover_gotoc/codegen/typ.rs:271:13
stack backtrace:
   0:     0x7feb975667da - std::backtrace_rs::backtrace::libunwind::trace::hc84915c67f6fb1e5
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7feb975667da - std::backtrace_rs::backtrace::trace_unsynchronized::h74fef551999c3a2f
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7feb975667da - std::sys_common::backtrace::_print_fmt::h8acfd19c1a6f1d1d
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7feb975667da - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9271b09f3576b7e0
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7feb975c92ee - core::fmt::write::h27d0bbb767cff1d5
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/core/src/fmt/mod.rs:1208:17
   5:     0x7feb97556c65 - std::io::Write::write_fmt::hc409ea2bb818fbea
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/io/mod.rs:1682:15
   6:     0x7feb975665a5 - std::sys_common::backtrace::_print::hfa031a98cf1e4011
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7feb975665a5 - std::sys_common::backtrace::print::he69ac0980f15620d
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7feb975692ef - std::panicking::default_hook::{{closure}}::h014cf704a69dce2b
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:267:22
   9:     0x7feb9756902b - std::panicking::default_hook::h380e71f8d8d49df7
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:286:9
  10:     0x55f7b1daeb0d - kani_compiler::session::PANIC_HOOK::{{closure}}::{{closure}}::h10f33c4e395bf462
  11:     0x55f7b1d04f67 - kani_compiler::codegen_cprover_gotoc::utils::debug::DEFAULT_HOOK::{{closure}}::{{closure}}::hf568cc16e5ffa08a
  12:     0x7feb97569b2d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hcfa7e50330911a79
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/alloc/src/boxed.rs:2032:9
  13:     0x7feb97569b2d - std::panicking::rust_panic_with_hook::h483f1ef90c766581
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:692:13
  14:     0x7feb97569862 - std::panicking::begin_panic_handler::{{closure}}::hd4c7d9116c0ef489
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:577:13
  15:     0x7feb97566c8c - std::sys_common::backtrace::__rust_end_short_backtrace::had27a083c7d7188b
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:137:18
  16:     0x7feb975695b2 - rust_begin_unwind
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:575:5
  17:     0x7feb975c5cd3 - core::panicking::panic_fmt::hbacb72817da3b060
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/core/src/panicking.rs:64:14
  18:     0x7feb975c5dad - core::panicking::panic::hbb63dcd9a5d7212e
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/core/src/panicking.rs:111:5
  19:     0x55f7b1ce11a9 - kani_compiler::codegen_cprover_gotoc::codegen::typ::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::sig_with_untupled_args::hfdda502c3c2a52ea
  20:     0x55f7b1ce14b6 - kani_compiler::codegen_cprover_gotoc::codegen::typ::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::fn_sig_of_instance::h0957a78432e4811e
  21:     0x55f7b1d1b38f - kani_compiler::codegen_cprover_gotoc::context::current_fn::CurrentFnCtx::new::h9e49a62362e43a2c
  22:     0x55f7b1c7ffc1 - kani_compiler::codegen_cprover_gotoc::codegen::function::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::declare_function::hcb4ad696d24f1916
  23:     0x55f7b1d09b60 - std::thread::local::LocalKey<T>::with::h8c541365775d3b68
  24:     0x55f7b1d95f05 - <kani_compiler::codegen_cprover_gotoc::compiler_interface::GotocCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::heaa499391d53b3f6
  25:     0x7feb99a86fa1 - <rustc_session[19dfb3d05ff8562d]::session::Session>::time::<alloc[58cfa59ca61fafa9]::boxed::Box<dyn core[6d94cc961ac87456]::any::Any>, rustc_interface[aec886e93b1add3f]::passes::start_codegen::{closure#0}>
  26:     0x7feb99a86ac9 - rustc_interface[aec886e93b1add3f]::passes::start_codegen
  27:     0x7feb99a847a6 - <rustc_interface[aec886e93b1add3f]::passes::QueryContext>::enter::<<rustc_interface[aec886e93b1add3f]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[6d94cc961ac87456]::result::Result<alloc[58cfa59ca61fafa9]::boxed::Box<dyn core[6d94cc961ac87456]::any::Any>, rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>>
  28:     0x7feb99a81a46 - <rustc_interface[aec886e93b1add3f]::queries::Queries>::ongoing_codegen
  29:     0x7feb99a80f67 - <rustc_interface[aec886e93b1add3f]::interface::Compiler>::enter::<rustc_driver[94a2f0241de75afa]::run_compiler::{closure#1}::{closure#2}, core[6d94cc961ac87456]::result::Result<core[6d94cc961ac87456]::option::Option<rustc_interface[aec886e93b1add3f]::queries::Linker>, rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>>
  30:     0x7feb99a7bf88 - rustc_span[ae2df7aa7c6c667b]::with_source_map::<core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>, rustc_interface[aec886e93b1add3f]::interface::run_compiler<core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>, rustc_driver[94a2f0241de75afa]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  31:     0x7feb99a7ba75 - <scoped_tls[db87656d258d017b]::ScopedKey<rustc_span[ae2df7aa7c6c667b]::SessionGlobals>>::set::<rustc_interface[aec886e93b1add3f]::interface::run_compiler<core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>, rustc_driver[94a2f0241de75afa]::run_compiler::{closure#1}>::{closure#0}, core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>>
  32:     0x7feb99a7b062 - std[acd1f573e90225f]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[aec886e93b1add3f]::util::run_in_thread_pool_with_globals<rustc_interface[aec886e93b1add3f]::interface::run_compiler<core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>, rustc_driver[94a2f0241de75afa]::run_compiler::{closure#1}>::{closure#0}, core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>>
  33:     0x7feb9a0ec49e - <<std[acd1f573e90225f]::thread::Builder>::spawn_unchecked_<rustc_interface[aec886e93b1add3f]::util::run_in_thread_pool_with_globals<rustc_interface[aec886e93b1add3f]::interface::run_compiler<core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>, rustc_driver[94a2f0241de75afa]::run_compiler::{closure#1}>::{closure#0}, core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6d94cc961ac87456]::result::Result<(), rustc_errors[56887b15c7ec6fbf]::ErrorGuaranteed>>::{closure#1} as core[6d94cc961ac87456]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7feb9b5da2d3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he955d3e33f115328
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/alloc/src/boxed.rs:2000:9
  35:     0x7feb9b5da2d3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h32515d9eaa012a19
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/alloc/src/boxed.rs:2000:9
  36:     0x7feb9b5da2d3 - std::sys::unix::thread::Thread::new::thread_start::h5af9cdd9a5a58d64
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys/unix/thread.rs:108:17
  37:     0x7feb97216bb5 - <unknown>
  38:     0x7feb97298d90 - <unknown>
  39:                0x0 - <unknown>

Kani unexpectedly panicked during compilation.
Please file an issue here: https://github.com/model-checking/kani/issues/new?labels=bug&template=bug_report.md

[Kani] current codegen item: declare_function: foo::<()>
[Kani] current codegen location: Loc { file: "/home/matthias/vcs/github/icemaker/kani/b.rs", function: None, start_line: 3, start_col: Some(1), end_line: 3, end_col: Some(55) }
error: /home/matthias/.kani/kani-0.22.0/bin/kani-compiler exited with status exit status: 101

[matthiaskrgr]

still crashing with 0.40