using if unsafe {...} { ... } causes ICE

[nyurik]

Code

See core lib change in https://github.com/rust-lang/rust/pull/121064/files

Meta

Using x.py from a84bb95

rustc 1.77.0-beta.1 (04ba45219 2024-02-04) running on x86_64-unknown-linux-gnu

Error output

[<output>
](error: internal compiler error: /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/compiler/rustc_codegen_ssa/src/mir/operand.rs:201:18: not immediate: OperandRef(Ref((ptr:  %6 = alloca { { ptr, i64 }, { ptr, i64 }, { ptr, [1 x i64] } }, align 8), None, Align(8 bytes)) @ TyAndLayout { ty: Arguments<'_>, layout: Layout { size: Size(48 bytes), align: AbiAndPrefAlign { abi: Align(8 bytes), pref: Align(8 bytes) }, abi: Aggregate { sized: true }, fields: Arbitrary { offsets: [Size(0 bytes), Size(32 bytes), Size(16 bytes)], memory_index: [0, 2, 1] }, largest_niche: Some(Niche { offset: Size(0 bytes), value: Pointer(AddressSpace(0)), valid_range: 1..=18446744073709551615 }), variants: Single { index: 0 }, max_repr_align: None, unadjusted_abi_align: Align(8 bytes) } }))

Backtrace

thread 'rustc' panicked at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/compiler/rustc_errors/src/lib.rs:932:30:
  Box<dyn Any>
  stack backtrace:
     0:     0x7f07b0d8bd16 - std::backtrace_rs::backtrace::libunwind::trace::hc987f3c35d55761d
                                 at /rustc/04ba45[2197](https://github.com/rust-lang/rust/actions/runs/7896056798/job/21549391196?pr=121064#step:26:2204)1a83d71477a406b5ce7a479e9d7af8/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
     1:     0x7f07b0d8bd16 - std::backtrace_rs::backtrace::trace_unsynchronized::h0adab636e703984a
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
     2:     0x7f07b0d8bd16 - std::sys_common::backtrace::_print_fmt::h40f45f951b4ac7d7
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/sys_common/backtrace.rs:68:5
     3:     0x7f07b0d8bd16 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h598d4176dd756587
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/sys_common/backtrace.rs:44:22
     4:     0x7f07b0dde770 - core::fmt::rt::Argument::fmt::h427ca33a589c[2202](https://github.com/rust-lang/rust/actions/runs/7896056798/job/21549391196?pr=121064#step:26:2209)
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/core/src/fmt/rt.rs:142:9
     5:     0x7f07b0dde770 - core::fmt::write::he2e4e385033a10d2
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/core/src/fmt/mod.rs:1120:17
     6:     0x7f07b0d7f61f - std::io::Write::write_fmt::h5d9d90611ed609ef
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/io/mod.rs:1846:15
     7:     0x7f07b0d8baf4 - std::sys_common::backtrace::_print::h37c713f895256a86
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/sys_common/backtrace.rs:47:5
     8:     0x7f07b0d8baf4 - std::sys_common::backtrace::print::hc99c64f387974770
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/sys_common/backtrace.rs:34:9
     9:     0x7f07b0d8e887 - std::panicking::default_hook::{{closure}}::hdf16b4533d11beb4
    10:     0x7f07b0d8e5e9 - std::panicking::default_hook::h223213ee257b8185
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/panicking.rs:292:9
    11:     0x7f07b39a896c - std[55ab4a542350c755]::panicking::update_hook::<alloc[4da3f6bd47afec24]::boxed::Box<rustc_driver_impl[ef4ee9058c24acfe]::install_ice_hook::{closure#0}>>::{closure#0}
    12:     0x7f07b0d8efd6 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hff82162297b64e89
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/alloc/src/boxed.rs:2029:9
    13:     0x7f07b0d8efd6 - std::panicking::rust_panic_with_hook::h8633089b9015a8b7
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/panicking.rs:785:13
    14:     0x7f07b39d81d4 - std[55ab4a542350c755]::panicking::begin_panic::<rustc_errors[68df17d15f76634e]::ExplicitBug>::{closure#0}
    15:     0x7f07b39d48c6 - std[55ab4a542350c755]::sys_common::backtrace::__rust_end_short_backtrace::<std[55ab4a542350c755]::panicking::begin_panic<rustc_errors[68df17d15f76634e]::ExplicitBug>::{closure#0}, !>
    16:     0x7f07b39cfbb6 - std[55ab4a542350c755]::panicking::begin_panic::<rustc_errors[68df17d15f76634e]::ExplicitBug>
    17:     0x7f07b39e3841 - <rustc_errors[68df17d15f76634e]::diagnostic_builder::BugAbort as rustc_errors[68df17d15f76634e]::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
    18:     0x7f07b3d725eb - <rustc_errors[68df17d15f76634e]::DiagCtxt>::bug::<alloc[4da3f6bd47afec24]::string::String>
    19:     0x7f07b3e0b23b - rustc_middle[cfc4b7b04cd03608]::util::bug::opt_span_bug_fmt::<rustc_span[70f6536c5e2f3755]::span_encoding::Span>::{closure#0}
    20:     0x7f07b3df3dba - rustc_middle[cfc4b7b04cd03608]::ty::context::tls::with_opt::<rustc_middle[cfc4b7b04cd03608]::util::bug::opt_span_bug_fmt<rustc_span[70f6536c5e2f3755]::span_encoding::Span>::{closure#0}, !>::{closure#0}
    21:     0x7f07b3df3c38 - rustc_middle[cfc4b7b04cd03608]::ty::context::tls::with_context_opt::<rustc_middle[cfc4b7b04cd03608]::ty::context::tls::with_opt<rustc_middle[cfc4b7b04cd03608]::util::bug::opt_span_bug_fmt<rustc_span[70f6536c5e2f3755]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
    22:     0x7f07b1f07430 - rustc_middle[cfc4b7b04cd03608]::util::bug::bug_fmt
    23:     0x7f07b574e82a - <rustc_codegen_llvm[103398a9ca8f425b]::builder::Builder as rustc_codegen_ssa[725a152d682a010f]::traits::intrinsic::IntrinsicCallMethods>::codegen_intrinsic_call
    24:     0x7f07b57551a5 - <rustc_codegen_ssa[725a152d682a010f]::mir::FunctionCx<rustc_codegen_llvm[103398a9ca8f425b]::builder::Builder>>::codegen_intrinsic_call
    25:     0x7f07b558ea63 - <rustc_codegen_ssa[725a152d682a010f]::mir::FunctionCx<rustc_codegen_llvm[103398a9ca8f425b]::builder::Builder>>::codegen_block
    26:     0x7f07b57404a6 - rustc_codegen_ssa[725a152d682a010f]::mir::codegen_mir::<rustc_codegen_llvm[103398a9ca8f425b]::builder::Builder>
    27:     0x7f07b572e561 - rustc_codegen_llvm[103398a9ca8f425b]::base::compile_codegen_unit::module_codegen
    28:     0x7f07b59b7f85 - <rustc_codegen_llvm[103398a9ca8f425b]::LlvmCodegenBackend as rustc_codegen_ssa[725a152d682a010f]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
    29:     0x7f07b5b08467 - <rustc_codegen_llvm[103398a9ca8f425b]::LlvmCodegenBackend as rustc_codegen_ssa[725a152d682a010f]::traits::backend::CodegenBackend>::codegen_crate
    30:     0x7f07b5b06230 - rustc_interface[2106013cc2f5b63c]::passes::start_codegen
    31:     0x7f07b5b05a06 - <rustc_interface[2106013cc2f5b63c]::queries::Queries>::codegen_and_build_linker
    32:     0x7f07b5993de6 - rustc_interface[2106013cc2f5b63c]::interface::run_compiler::<core[ce9c323f7905c200]::result::Result<(), rustc_span[70f6536c5e2f3755]::ErrorGuaranteed>, rustc_driver_impl[ef4ee9058c24acfe]::run_compiler::{closure#0}>::{closure#0}
    33:     0x7f07b5b01ba1 - std[55ab4a542350c755]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[2106013cc2f5b63c]::util::run_in_thread_with_globals<rustc_interface[2106013cc2f5b63c]::interface::run_compiler<core[ce9c323f7905c200]::result::Result<(), rustc_span[70f6536c5e2f3755]::ErrorGuaranteed>, rustc_driver_impl[ef4ee9058c24acfe]::run_compiler::{closure#0}>::{closure#0}, core[ce9c323f7905c200]::result::Result<(), rustc_span[70f6536c5e2f3755]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ce9c323f7905c200]::result::Result<(), rustc_span[70f6536c5e2f3755]::ErrorGuaranteed>>
    34:     0x7f07b5b019ff - <<std[55ab4a542350c755]::thread::Builder>::spawn_unchecked_<rustc_interface[2106013cc2f5b63c]::util::run_in_thread_with_globals<rustc_interface[2106013cc2f5b63c]::interface::run_compiler<core[ce9c323f7905c200]::result::Result<(), rustc_span[70f6536c5e2f3755]::ErrorGuaranteed>, rustc_driver_impl[ef4ee9058c24acfe]::run_compiler::{closure#0}>::{closure#0}, core[ce9c323f7905c200]::result::Result<(), rustc_span[70f6536c5e2f3755]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ce9c323f7905c200]::result::Result<(), rustc_span[70f6536c5e2f3755]::ErrorGuaranteed>>::{closure#1} as core[ce9c323f7905c200]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
    35:     0x7f07b0d98675 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf8f17589d536646e
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/alloc/src/boxed.rs:2015:9
    36:     0x7f07b0d98675 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h68da270e7d912a3c
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/alloc/src/boxed.rs:2015:9
    37:     0x7f07b0d98675 - std::sys::pal::unix::thread::Thread::new::thread_start::he371c43bd596b52d
                                 at /rustc/04ba4521971a83d71477a406b5ce7a479e9d7af8/library/std/src/sys/pal/unix/thread.rs:108:17
    38:     0x7f07b0b636ba - <unknown>
    39:     0x7f07b0bf2120 - <unknown>
    40:                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
  
  warning: the ICE couldn't be written to `/checkout/rustc-ice-2024-02-14T03_25_45-1890.txt`: Read-only file system (os error 30)
  
  note: rustc 1.77.0-beta.1 (04ba45219 2024-02-04) running on x86_64-unknown-linux-gnu

[Noratrieb]

This is related to is_val_statically_known, which is an intrinsic. We don't track bad error messages for intrinsics as bugs, so I'm going to close this.
But in this case, feel free to open a PR with a better panic message.