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ICE: Function should've been declared before usage, was: Can't take address of Expr #2255

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matthiaskrgr opened this issue Mar 2, 2023 · 1 comment
Open

ICE: Function should've been declared before usage, was: Can't take address of Expr #2255

matthiaskrgr opened this issue Mar 2, 2023 · 1 comment
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[C] Bug This is a bug. Something isn't working. [F] Crash Kani crashed

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@matthiaskrgr
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I tried this code:

#[kani::proof]
fn foo() -> u32 { 42 }

#[kani::proof]
fn main() {
    println!("{:p}", &foo);
    //~^ WARNING taking a reference to a function item does not give a function pointer
}

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

warning: taking a reference to a function item does not give a function pointer
 --> a.rs:6:22
  |
6 |     println!("{:p}", &foo);
  |                      ^^^^ help: cast `foo` to obtain a function pointer: `foo as fn() -> _`
  |
  = note: `#[warn(function_item_references)]` on by default

thread '<unnamed>' panicked at 'Can't take address of Expr { value: AddressOf(Expr { value: Symbol { identifier: "_RNvCsbvss9KOnXkz_1a3foo::FnDefSingleton" }, typ: StructTag("tag-_RNvCsbvss9KOnXkz_1a3foo::FnDefStruct"), location: None }), typ: Pointer { typ: StructTag("tag-_RNvCsbvss9KOnXkz_1a3foo::FnDefStruct") }, location: None }', cprover_bindings/src/goto_program/expr.rs:420:9
stack backtrace:
   0:     0x7f25411667da - std::backtrace_rs::backtrace::libunwind::trace::hc84915c67f6fb1e5
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f25411667da - std::backtrace_rs::backtrace::trace_unsynchronized::h74fef551999c3a2f
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f25411667da - std::sys_common::backtrace::_print_fmt::h8acfd19c1a6f1d1d
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f25411667da - <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:     0x7f25411c92ee - core::fmt::write::h27d0bbb767cff1d5
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f2541156c65 - std::io::Write::write_fmt::hc409ea2bb818fbea
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/io/mod.rs:1682:15
   6:     0x7f25411665a5 - std::sys_common::backtrace::_print::hfa031a98cf1e4011
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f25411665a5 - std::sys_common::backtrace::print::he69ac0980f15620d
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f25411692ef - std::panicking::default_hook::{{closure}}::h014cf704a69dce2b
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:267:22
   9:     0x7f254116902b - std::panicking::default_hook::h380e71f8d8d49df7
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:286:9
  10:     0x557a3c1aeb0d - kani_compiler::session::PANIC_HOOK::{{closure}}::{{closure}}::h10f33c4e395bf462
  11:     0x557a3c104f67 - kani_compiler::codegen_cprover_gotoc::utils::debug::DEFAULT_HOOK::{{closure}}::{{closure}}::hf568cc16e5ffa08a
  12:     0x7f2541169b2d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hcfa7e50330911a79
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/alloc/src/boxed.rs:2032:9
  13:     0x7f2541169b2d - std::panicking::rust_panic_with_hook::h483f1ef90c766581
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:692:13
  14:     0x7f25411698a9 - std::panicking::begin_panic_handler::{{closure}}::hd4c7d9116c0ef489
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:579:13
  15:     0x7f2541166c8c - std::sys_common::backtrace::__rust_end_short_backtrace::had27a083c7d7188b
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys_common/backtrace.rs:137:18
  16:     0x7f25411695b2 - rust_begin_unwind
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/panicking.rs:575:5
  17:     0x7f25411c5cd3 - core::panicking::panic_fmt::hbacb72817da3b060
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/core/src/panicking.rs:64:14
  18:     0x557a3c2df7ca - cprover_bindings::goto_program::expr::Expr::address_of::h1636674499f01393
  19:     0x557a3c0c7821 - kani_compiler::codegen_cprover_gotoc::codegen::place::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_place_ref::h4b77c777dff90545
  20:     0x557a3c0c8fbb - kani_compiler::codegen_cprover_gotoc::codegen::rvalue::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_rvalue::h57a2cf71297ecf62
  21:     0x557a3c0d8080 - kani_compiler::codegen_cprover_gotoc::codegen::statement::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_statement::h4c6e1c8bf226a338
  22:     0x557a3c07f0d1 - kani_compiler::codegen_cprover_gotoc::codegen::function::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_function::h541ea7f90d847b35
  23:     0x557a3c10abf0 - std::thread::local::LocalKey<T>::with::hb907a536239d23f6
  24:     0x557a3c1964c8 - <kani_compiler::codegen_cprover_gotoc::compiler_interface::GotocCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::heaa499391d53b3f6
  25:     0x7f2543686fa1 - <rustc_session[19dfb3d05ff8562d]::session::Session>::time::<alloc[58cfa59ca61fafa9]::boxed::Box<dyn core[6d94cc961ac87456]::any::Any>, rustc_interface[aec886e93b1add3f]::passes::start_codegen::{closure#0}>
  26:     0x7f2543686ac9 - rustc_interface[aec886e93b1add3f]::passes::start_codegen
  27:     0x7f25436847a6 - <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:     0x7f2543681a46 - <rustc_interface[aec886e93b1add3f]::queries::Queries>::ongoing_codegen
  29:     0x7f2543680f67 - <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:     0x7f254367bf88 - 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:     0x7f254367ba75 - <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:     0x7f254367b062 - 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:     0x7f2543cec49e - <<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:     0x7f25451da2d3 - <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:     0x7f25451da2d3 - <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:     0x7f25451da2d3 - std::sys::unix::thread::Thread::new::thread_start::h5af9cdd9a5a58d64
                               at /rustc/c6fcdb690609769a240fc8ab0de0ce68d5ea7dba/library/std/src/sys/unix/thread.rs:108:17
  37:     0x7f2540f05bb5 - <unknown>
  38:     0x7f2540f87d90 - <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: codegen_function: <&fn() -> u32 {foo} as std::fmt::Pointer>::fmt
_RNvXsk_NtCshQhm45nWocF_4core3fmtRNvCsbvss9KOnXkz_1a3fooNtB5_7Pointer3fmtBx_
[Kani] current codegen location: Loc { file: "/home/runner/.rustup/toolchains/nightly-2022-12-11-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs", function: None, start_line: 2520, start_col: Some(5), end_line: 2520, end_col: Some(51) }
warning: 1 warning emitted

error: /home/matthias/.kani/kani-0.22.0/bin/kani-compiler exited with status exit status: 101
@matthiaskrgr matthiaskrgr added the [C] Bug This is a bug. Something isn't working. label Mar 2, 2023
@zhassan-aws zhassan-aws added the [F] Crash Kani crashed label Mar 2, 2023
@matthiaskrgr
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Contributor Author

with kani 0.40, this now crashes with:

Kani Rust Verifier 0.40.0 (standalone)
warning: taking a reference to a function item does not give a function pointer
 --> a.rs:6:22
  |
6 |     println!("{:p}", &foo);
  |                      ^^^^ help: cast `foo` to obtain a function pointer: `foo as fn() -> _`
  |
  = note: `#[warn(function_item_references)]` on by default

thread 'rustc' panicked at kani-compiler/src/codegen_cprover_gotoc/codegen/operand.rs:720:18:
Function `{func}` should've been declared before usage
stack backtrace:
   0:     0x7fc21e369cfc - std::backtrace_rs::backtrace::libunwind::trace::h974857262e179b17
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7fc21e369cfc - std::backtrace_rs::backtrace::trace_unsynchronized::h6adce2053c056ac9
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fc21e369cfc - std::sys_common::backtrace::_print_fmt::hcf2018a5ad956761
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fc21e369cfc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3d39e48ce4d7e36f
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fc21e3cbf50 - core::fmt::rt::Argument::fmt::hef0ae15422a7f61d
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/core/src/fmt/rt.rs:142:9
   5:     0x7fc21e3cbf50 - core::fmt::write::hf465a4ba34489409
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/core/src/fmt/mod.rs:1117:17
   6:     0x7fc21e35dc1f - std::io::Write::write_fmt::hf34ad5986fa99e89
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/io/mod.rs:1763:15
   7:     0x7fc21e369ae4 - std::sys_common::backtrace::_print::h5aa7f1d99916c125
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fc21e369ae4 - std::sys_common::backtrace::print::h036d85b5c81889eb
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fc21e36c777 - std::panicking::default_hook::{{closure}}::h9b311bcc8d2b2a40
  10:     0x7fc21e36c4df - std::panicking::default_hook::hd7a03fd029ce4ee2
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/panicking.rs:292:9
  11:     0x561655807c0d - kani_compiler::session::PANIC_HOOK::{{closure}}::{{closure}}::h270fbeb056d900dc
  12:     0x561655807703 - kani_compiler::codegen_cprover_gotoc::utils::debug::DEFAULT_HOOK::{{closure}}::{{closure}}::h410a2f5534eafaf7
  13:     0x7fc21e36ceb8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h079168172b9ee18d
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/alloc/src/boxed.rs:2021:9
  14:     0x7fc21e36ceb8 - std::panicking::rust_panic_with_hook::h9ec5267af19ebd61
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/panicking.rs:783:13
  15:     0x7fc21e36cc0e - std::panicking::begin_panic_handler::{{closure}}::hded4ae2a191a7bae
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/panicking.rs:657:13
  16:     0x7fc21e36a1c6 - std::sys_common::backtrace::__rust_end_short_backtrace::h3b03f6ccd27da73f
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/sys_common/backtrace.rs:170:18
  17:     0x7fc21e36c972 - rust_begin_unwind
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/panicking.rs:645:5
  18:     0x7fc21e3c8675 - core::panicking::panic_fmt::h290f6f1be63b094c
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/core/src/panicking.rs:72:14
  19:     0x7fc21e3c8423 - core::panicking::panic_display::h2c1138d5cf12103e
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/core/src/panicking.rs:178:5
  20:     0x7fc21e3c8423 - core::panicking::panic_str::h4ec91ecf807e2a19
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/core/src/panicking.rs:152:5
  21:     0x7fc21e3c8423 - core::option::expect_failed::hb666b084f64dd703
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/core/src/option.rs:1979:5
  22:     0x5616556f4c6b - kani_compiler::codegen_cprover_gotoc::codegen::operand::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_func_symbol::he115d4854c69882b
  23:     0x5616556f508e - kani_compiler::codegen_cprover_gotoc::codegen::operand::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_fn_item::h1d6f8909544805e9
  24:     0x5616556f5828 - kani_compiler::codegen_cprover_gotoc::codegen::place::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_local_fndef::h09dea6bdb887347c
  25:     0x5616556f58cc - kani_compiler::codegen_cprover_gotoc::codegen::place::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_local_fndef::h09dea6bdb887347c
  26:     0x5616556f5b99 - kani_compiler::codegen_cprover_gotoc::codegen::place::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_local::h3efd492532155a62
  27:     0x5616556f920c - kani_compiler::codegen_cprover_gotoc::codegen::place::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_place::h4dc87b5d60ece886
  28:     0x56165570fa7c - kani_compiler::codegen_cprover_gotoc::codegen::statement::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_statement::h67859eadd810316a
  29:     0x5616556c3909 - kani_compiler::codegen_cprover_gotoc::codegen::block::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::codegen_block::h892262db0bd2a271
  30:     0x5616557270ec - kani_compiler::codegen_cprover_gotoc::utils::debug::<impl kani_compiler::codegen_cprover_gotoc::context::goto_ctx::GotocCtx>::call_with_panic_debug_info::hc439f7b37aa26293
  31:     0x56165575b10a - kani_compiler::codegen_cprover_gotoc::compiler_interface::GotocCodegenBackend::codegen_items::hc367daaf74d3c1cb
  32:     0x56165575fcf5 - <kani_compiler::codegen_cprover_gotoc::compiler_interface::GotocCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::h2ef5769ca04f3bc4
  33:     0x7fc222d80fd9 - rustc_interface[90d65b0f51490bf6]::passes::start_codegen
  34:     0x7fc222d80a96 - <rustc_interface[90d65b0f51490bf6]::queries::Queries>::ongoing_codegen
  35:     0x7fc222d43693 - std[d7fc13cc5242579e]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[90d65b0f51490bf6]::util::run_in_thread_with_globals<rustc_interface[90d65b0f51490bf6]::interface::run_compiler<core[53bdee0566a68c19]::result::Result<(), rustc_span[88faddf4715d2d43]::ErrorGuaranteed>, rustc_driver_impl[88c66c37425cba72]::run_compiler::{closure#1}>::{closure#0}, core[53bdee0566a68c19]::result::Result<(), rustc_span[88faddf4715d2d43]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[53bdee0566a68c19]::result::Result<(), rustc_span[88faddf4715d2d43]::ErrorGuaranteed>>
  36:     0x7fc222d42909 - <<std[d7fc13cc5242579e]::thread::Builder>::spawn_unchecked_<rustc_interface[90d65b0f51490bf6]::util::run_in_thread_with_globals<rustc_interface[90d65b0f51490bf6]::interface::run_compiler<core[53bdee0566a68c19]::result::Result<(), rustc_span[88faddf4715d2d43]::ErrorGuaranteed>, rustc_driver_impl[88c66c37425cba72]::run_compiler::{closure#1}>::{closure#0}, core[53bdee0566a68c19]::result::Result<(), rustc_span[88faddf4715d2d43]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[53bdee0566a68c19]::result::Result<(), rustc_span[88faddf4715d2d43]::ErrorGuaranteed>>::{closure#1} as core[53bdee0566a68c19]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x7fc21e377c85 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he310d06a8f297797
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/alloc/src/boxed.rs:2007:9
  38:     0x7fc21e377c85 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h69350f715ad37c20
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/alloc/src/boxed.rs:2007:9
  39:     0x7fc21e377c85 - std::sys::unix::thread::Thread::new::thread_start::h7310dea1d780d6a0
                               at /rustc/31bc7e2c47e82798a392c770611975a6883132c8/library/std/src/sys/unix/thread.rs:108:17
  40:     0x7fc21e1419eb - <unknown>
  41:     0x7fc21e1c57cc - <unknown>
  42:                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: codegen_function: <*const fn() -> u32 {foo} as std::fmt::Pointer>::fmt
_RNvXsg_NtCs5k6HhVuWWKi_4core3fmtPNvCsaxqAW6SeOYc_1a3fooNtB5_7Pointer3fmtBx_
[Kani] current codegen location: Loc { file: "/github/home/.rustup/toolchains/nightly-2023-10-31-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs", function: None, start_line: 2394, start_col: Some(5), end_line: 2394, end_col: Some(51) }
warning: 1 warning emitted

error: /home/matthias/.kani/kani-0.40.0/bin/kani-compiler exited with status exit status: 101
```

@matthiaskrgr matthiaskrgr changed the title ICE: Can't take address of Expr ICE: Function should've been declared before usage, was: Can't take address of Expr Nov 12, 2023
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[C] Bug This is a bug. Something isn't working. [F] Crash Kani crashed
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