Another(?) 'failed to get layout for...' ICE

[cehteh]

Code

Minimal Example:

https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=d93a36587d78f6351cf687e2a8f00ace

use core::iter::Peekable;

type FooFn = &'static fn(&Peekable<&dyn Iterator<Item = i32>>);

pub const fn foofail(foofn: FooFn) {
    let _go_boom_ = foofn;
}

Meta

rustc --version --verbose:

rustc 1.72.1 (d5c2e9c34 2023-09-13)
binary: rustc
commit-hash: d5c2e9c342b358556da91d61ed4133f6f50fc0c3
commit-date: 2023-09-13
host: x86_64-unknown-linux-gnu
release: 1.72.1
LLVM version: 16.0.5

Same ICE on nightly and beta.

Error output

error: internal compiler error: compiler/rustc_codegen_llvm/src/context.rs:987:13: failed to get layout for `Peekable<&dyn Iterator<Item = OsStr>>`: NormalizationFailure(std::option::Option<std::option::Option<<&dyn std::iter::Iterator<Item = std::ffi::OsStr> as std::iter::Iterator>::Item>>, Type(std::option::Option<std::option::Option<<&dyn std::iter::Iterator<Item = std::ffi::OsStr> as std::iter::Iterator>::Item>>))

Backtrace

``` thread 'rustc' panicked at 'Box', /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/compiler/rustc_errors/src/lib.rs:995:33 stack backtrace: 0: 0x7fdc86f62b51 - std::backtrace_rs::backtrace::libunwind::trace::h66dc1c6acf794faa at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5 1: 0x7fdc86f62b51 - std::backtrace_rs::backtrace::trace_unsynchronized::ha80d20099a67f790 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7fdc86f62b51 - std::sys_common::backtrace::_print_fmt::h7b959d43f35f16d4 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:65:5 3: 0x7fdc86f62b51 - ::fmt::hdaa196410d9ee0b9 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:44:22 4: 0x7fdc86fc96ff - core::fmt::rt::Argument::fmt::h0ddfbbe8be3f80d0 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/core/src/fmt/rt.rs:138:9 5: 0x7fdc86fc96ff - core::fmt::write::h66b3c629f3d623e4 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/core/src/fmt/mod.rs:1094:21 6: 0x7fdc86f55497 - std::io::Write::write_fmt::hb6d80fba4115e0c2 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/io/mod.rs:1714:15 7: 0x7fdc86f62965 - std::sys_common::backtrace::_print::h1a49cfb0cf3cce17 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:47:5 8: 0x7fdc86f62965 - std::sys_common::backtrace::print::hca95c2d0055e42a2 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:34:9 9: 0x7fdc86f65743 - std::panicking::default_hook::{{closure}}::hc03c01c56bca600c at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:269:22 10: 0x7fdc86f654d4 - std::panicking::default_hook::hb2cb5315b6634f1c at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:288:9 11: 0x7fdc8a26b60b - rustc_driver_impl[e91af841be79713a]::install_ice_hook::{closure#0} 12: 0x7fdc86f65f6e - as core::ops::function::Fn>::call::hb3a915ffd78277c6 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/alloc/src/boxed.rs:2007:9 13: 0x7fdc86f65f6e - std::panicking::rust_panic_with_hook::h75cd912a39a34e8a at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:709:13 14: 0x7fdc8a0fc041 - std[74d10c9f32099e86]::panicking::begin_panic::::{closure#0} 15: 0x7fdc8a0fbd66 - std[74d10c9f32099e86]::sys_common::backtrace::__rust_end_short_backtrace::::{closure#0}, !> 16: 0x7fdc8a0e0216 - std[74d10c9f32099e86]::panicking::begin_panic:: 17: 0x7fdc8a0de732 - ::span_bug:: 18: 0x7fdc8a0ddb76 - ::span_bug:: 19: 0x7fdc8a0d8a7d - rustc_middle[fbd75b4db2cdb7e6]::util::bug::opt_span_bug_fmt::::{closure#0} 20: 0x7fdc8a0d8aaa - rustc_middle[fbd75b4db2cdb7e6]::ty::context::tls::with_opt::::{closure#0}, !>::{closure#0} 21: 0x7fdc8a0d738a - rustc_middle[fbd75b4db2cdb7e6]::ty::context::tls::with_context_opt::::{closure#0}, !>::{closure#0}, !> 22: 0x7fdc88b0ebc4 - rustc_middle[fbd75b4db2cdb7e6]::util::bug::span_bug_fmt:: 23: 0x7fdc8a12ed1a - ::handle_layout_err 24: 0x7fdc8a128bda - ::spanned_layout_of::{closure#0} 25: 0x7fdc883d5d89 - as rustc_codegen_llvm[367182e9bda81d84]::type_of::LayoutLlvmExt>::llvm_type 26: 0x7fdc8863644e - as rustc_codegen_llvm[367182e9bda81d84]::abi::FnAbiLlvmExt>::llvm_type 27: 0x7fdc883d51b5 - as rustc_codegen_llvm[367182e9bda81d84]::type_of::LayoutLlvmExt>::llvm_type 28: 0x7fdc883d43a4 - as rustc_codegen_llvm[367182e9bda81d84]::type_of::LayoutLlvmExt>::llvm_type 29: 0x7fdc883d43a4 - as rustc_codegen_llvm[367182e9bda81d84]::type_of::LayoutLlvmExt>::llvm_type 30: 0x7fdc8863644e - as rustc_codegen_llvm[367182e9bda81d84]::abi::FnAbiLlvmExt>::llvm_type 31: 0x7fdc88634cfe - ::predefine_fn 32: 0x7fdc8984a945 - rustc_codegen_llvm[367182e9bda81d84]::base::compile_codegen_unit::module_codegen 33: 0x7fdc89848b35 - ::with_deps::<>::with_task>::{closure#0}::{closure#0}, rustc_codegen_ssa[d0f56ad1a06d95ee]::ModuleCodegen> 34: 0x7fdc8984831f - rustc_codegen_llvm[367182e9bda81d84]::base::compile_codegen_unit 35: 0x7fdc89845965 - rustc_codegen_ssa[d0f56ad1a06d95ee]::base::codegen_crate:: 36: 0x7fdc89845266 - ::codegen_crate 37: 0x7fdc89729a72 - ::time::, rustc_interface[9522ab489a5f66e6]::passes::start_codegen::{closure#0}> 38: 0x7fdc897295bb - rustc_interface[9522ab489a5f66e6]::passes::start_codegen 39: 0x7fdc8972319a - ::enter::<::ongoing_codegen::{closure#0}, core[63ccc595abf60ca6]::result::Result, rustc_span[ca0c6fb73220b455]::ErrorGuaranteed>> 40: 0x7fdc897225e8 - ::enter::, rustc_span[ca0c6fb73220b455]::ErrorGuaranteed>> 41: 0x7fdc8971f7b5 - rustc_span[ca0c6fb73220b455]::set_source_map::, rustc_interface[9522ab489a5f66e6]::interface::run_compiler, rustc_driver_impl[e91af841be79713a]::run_compiler::{closure#1}>::{closure#0}::{closure#0}> 42: 0x7fdc8971f226 - >::set::, rustc_driver_impl[e91af841be79713a]::run_compiler::{closure#1}>::{closure#0}, core[63ccc595abf60ca6]::result::Result<(), rustc_span[ca0c6fb73220b455]::ErrorGuaranteed>> 43: 0x7fdc8971e7ec - std[74d10c9f32099e86]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[e91af841be79713a]::run_compiler::{closure#1}>::{closure#0}, core[63ccc595abf60ca6]::result::Result<(), rustc_span[ca0c6fb73220b455]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[63ccc595abf60ca6]::result::Result<(), rustc_span[ca0c6fb73220b455]::ErrorGuaranteed>> 44: 0x7fdc89aa53b5 - <::spawn_unchecked_, rustc_driver_impl[e91af841be79713a]::run_compiler::{closure#1}>::{closure#0}, core[63ccc595abf60ca6]::result::Result<(), rustc_span[ca0c6fb73220b455]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[63ccc595abf60ca6]::result::Result<(), rustc_span[ca0c6fb73220b455]::ErrorGuaranteed>>::{closure#1} as core[63ccc595abf60ca6]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 45: 0x7fdc86f70425 - as core::ops::function::FnOnce>::call_once::hde6e666388faa495 at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/alloc/src/boxed.rs:1993:9 46: 0x7fdc86f70425 - as core::ops::function::FnOnce>::call_once::h9b6389e489a4842f at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/alloc/src/boxed.rs:1993:9 47: 0x7fdc86f70425 - std::sys::unix::thread::Thread::new::thread_start::hcab660740b858b1f at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys/unix/thread.rs:108:17 48: 0x7fdc86d0d044 - start_thread at ./nptl/pthread_create.c:442:8 49: 0x7fdc86d8d5fc - __GI___clone3 at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 50: 0x0 - ```

[cehteh]

Unrelated question:

Having a constfn that takes a reference to another function containing &mut references as in:

https://play.rust-lang.org/?version=beta&mode=debug&edition=2021&gist=eeaa40565005b2533afc16efbdaa036c

will complain that &mut references are not allowed in constfns. Even if the constfn never calls the passed function (meant to attach it in a builder pattern). Is this intentional or a bug?

[compiler-errors]

This became a post-mono error (so it just has a really bad span) in #111580, but no longer ICEs