internal compiler error: failed to get layout

[iamanonymouscs]

Code

use std::mem;

pub struct MyStruct<T: MyTrait> {
pub field: <T as MyTrait>::Inner,
}

pub trait MyTrait {
type Inner: MyTrait;
}

impl<T: MyTrait> MyTrait for MyStruct<T> {
type Inner = MyStruct<MyStruct<T>>;
}

impl MyTrait for () {
type Inner = ();
}

fn calculate_size<T: MyTrait>() -> usize {
mem::size_of::<MyStruct<T>>()
}

fn main() {
println!("{}", calculate_size::<MyStruct<()>>());
}

Meta

rustc --version --verbose:

$ rustc --version --verbose
rustc 1.73.0-nightly (db7ff98a7 2023-07-31)
binary: rustc
commit-hash: db7ff98a72f3e742b641f9cb16d0e8c285e87e9b
commit-date: 2023-07-31
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 16.0.5

Error output

error[E0391]: cycle detected when computing layout of `MyStruct<MyStruct<()>>`
  |
  = note: ...which requires computing layout of `<MyStruct<()> as MyTrait>::Inner`...
  = note: ...which again requires computing layout of `MyStruct<MyStruct<()>>`, completing the cycle
  = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information

error: internal compiler error: compiler/rustc_codegen_llvm/src/context.rs:1005:13: failed to get layout for `MyStruct<MyStruct<()>>`: Cycle

Backtrace

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/compiler/rustc_errors/src/lib.rs:989:33
stack backtrace:
   0:     0x7f1375b674bc - std::backtrace_rs::backtrace::libunwind::trace::h00560e9152510f67
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f1375b674bc - std::backtrace_rs::backtrace::trace_unsynchronized::h0f27c3665dd0a867
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f1375b674bc - std::sys_common::backtrace::_print_fmt::h5dba0ff3e06fa698
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f1375b674bc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h4debeea1996f535b
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f1375bcdbac - core::fmt::rt::Argument::fmt::h1e53d9bbf5a265dd
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/core/src/fmt/rt.rs:138:9
   5:     0x7f1375bcdbac - core::fmt::write::hcb86202702aeaf68
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f1375b59b1e - std::io::Write::write_fmt::h6b056feb2ab827f8
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/io/mod.rs:1714:15
   7:     0x7f1375b672a5 - std::sys_common::backtrace::_print::h63c494f55c85c02e
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f1375b672a5 - std::sys_common::backtrace::print::h0d84953923cd4383
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f1375b6a3fa - std::panicking::panic_hook_with_disk_dump::{{closure}}::h0ded106e3e100970
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/panicking.rs:278:22
  10:     0x7f1375b6a093 - std::panicking::panic_hook_with_disk_dump::h80545efc2b457190
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/panicking.rs:312:9
  11:     0x7f1378e0e2e9 - rustc_driver_impl[953ac255d00f3c7f]::install_ice_hook::{closure#0}
  12:     0x7f1375b6aca0 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h005d394de554c94e
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/alloc/src/boxed.rs:2021:9
  13:     0x7f1375b6aca0 - std::panicking::rust_panic_with_hook::ha35d072680b6716b
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/panicking.rs:733:13
  14:     0x7f1378cb71c1 - std[cfe24ee53075a1e5]::panicking::begin_panic::<rustc_errors[b1a6789dfd2ebe34]::ExplicitBug>::{closure#0}
  15:     0x7f1378cb61a6 - std[cfe24ee53075a1e5]::sys_common::backtrace::__rust_end_short_backtrace::<std[cfe24ee53075a1e5]::panicking::begin_panic<rustc_errors[b1a6789dfd2ebe34]::ExplicitBug>::{closure#0}, !>
  16:     0x7f1378c77676 - std[cfe24ee53075a1e5]::panicking::begin_panic::<rustc_errors[b1a6789dfd2ebe34]::ExplicitBug>
  17:     0x7f1378cbb5be - <rustc_errors[b1a6789dfd2ebe34]::HandlerInner>::span_bug::<rustc_span[c85fb125fe1c027]::span_encoding::Span, alloc[9d71a00e6f43b08]::string::String>
  18:     0x7f1378cbb3cf - <rustc_errors[b1a6789dfd2ebe34]::Handler>::span_bug::<rustc_span[c85fb125fe1c027]::span_encoding::Span, alloc[9d71a00e6f43b08]::string::String>
  19:     0x7f1378ca662d - rustc_middle[23eac342ec155d27]::util::bug::opt_span_bug_fmt::<rustc_span[c85fb125fe1c027]::span_encoding::Span>::{closure#0}
  20:     0x7f1378ca665a - rustc_middle[23eac342ec155d27]::ty::context::tls::with_opt::<rustc_middle[23eac342ec155d27]::util::bug::opt_span_bug_fmt<rustc_span[c85fb125fe1c027]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f1378ca5f28 - rustc_middle[23eac342ec155d27]::ty::context::tls::with_context_opt::<rustc_middle[23eac342ec155d27]::ty::context::tls::with_opt<rustc_middle[23eac342ec155d27]::util::bug::opt_span_bug_fmt<rustc_span[c85fb125fe1c027]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f137779a464 - rustc_middle[23eac342ec155d27]::util::bug::span_bug_fmt::<rustc_span[c85fb125fe1c027]::span_encoding::Span>
  23:     0x7f1378cd7a3b - <rustc_codegen_llvm[fbffa82a3d5a30ab]::context::CodegenCx as rustc_middle[23eac342ec155d27]::ty::layout::LayoutOfHelpers>::handle_layout_err
  24:     0x7f1378cd754a - <rustc_codegen_llvm[fbffa82a3d5a30ab]::context::CodegenCx as rustc_middle[23eac342ec155d27]::ty::layout::LayoutOf>::spanned_layout_of::{closure#0}
  25:     0x7f13777b2355 - <rustc_codegen_ssa[1e93ac4b57e61c57]::mir::FunctionCx<rustc_codegen_llvm[fbffa82a3d5a30ab]::builder::Builder>>::codegen_rvalue_operand
  26:     0x7f137777e373 - rustc_codegen_ssa[1e93ac4b57e61c57]::mir::codegen_mir::<rustc_codegen_llvm[fbffa82a3d5a30ab]::builder::Builder>
  27:     0x7f1377f66060 - rustc_codegen_llvm[fbffa82a3d5a30ab]::base::compile_codegen_unit::module_codegen
  28:     0x7f1377f63c99 - rustc_codegen_llvm[fbffa82a3d5a30ab]::base::compile_codegen_unit
  29:     0x7f1377f609d4 - rustc_codegen_ssa[1e93ac4b57e61c57]::base::codegen_crate::<rustc_codegen_llvm[fbffa82a3d5a30ab]::LlvmCodegenBackend>
  30:     0x7f1377f603cb - <rustc_codegen_llvm[fbffa82a3d5a30ab]::LlvmCodegenBackend as rustc_codegen_ssa[1e93ac4b57e61c57]::traits::backend::CodegenBackend>::codegen_crate
  31:     0x7f1378090f02 - <rustc_session[1b335dd3cc3c5820]::session::Session>::time::<alloc[9d71a00e6f43b08]::boxed::Box<dyn core[24a2ba61524efef7]::any::Any>, rustc_interface[22a5bdce7fd6e981]::passes::start_codegen::{closure#0}>
  32:     0x7f1378090a4b - rustc_interface[22a5bdce7fd6e981]::passes::start_codegen
  33:     0x7f137808affa - <rustc_middle[23eac342ec155d27]::ty::context::GlobalCtxt>::enter::<<rustc_interface[22a5bdce7fd6e981]::queries::Queries>::ongoing_codegen::{closure#0}, core[24a2ba61524efef7]::result::Result<alloc[9d71a00e6f43b08]::boxed::Box<dyn core[24a2ba61524efef7]::any::Any>, rustc_span[c85fb125fe1c027]::ErrorGuaranteed>>
  34:     0x7f137808a033 - <rustc_interface[22a5bdce7fd6e981]::interface::Compiler>::enter::<rustc_driver_impl[953ac255d00f3c7f]::run_compiler::{closure#1}::{closure#2}, core[24a2ba61524efef7]::result::Result<core[24a2ba61524efef7]::option::Option<rustc_interface[22a5bdce7fd6e981]::queries::Linker>, rustc_span[c85fb125fe1c027]::ErrorGuaranteed>>
  35:     0x7f13780830a8 - std[cfe24ee53075a1e5]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[22a5bdce7fd6e981]::util::run_in_thread_pool_with_globals<rustc_interface[22a5bdce7fd6e981]::interface::run_compiler<core[24a2ba61524efef7]::result::Result<(), rustc_span[c85fb125fe1c027]::ErrorGuaranteed>, rustc_driver_impl[953ac255d00f3c7f]::run_compiler::{closure#1}>::{closure#0}, core[24a2ba61524efef7]::result::Result<(), rustc_span[c85fb125fe1c027]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[24a2ba61524efef7]::result::Result<(), rustc_span[c85fb125fe1c027]::ErrorGuaranteed>>
  36:     0x7f137808282e - <<std[cfe24ee53075a1e5]::thread::Builder>::spawn_unchecked_<rustc_interface[22a5bdce7fd6e981]::util::run_in_thread_pool_with_globals<rustc_interface[22a5bdce7fd6e981]::interface::run_compiler<core[24a2ba61524efef7]::result::Result<(), rustc_span[c85fb125fe1c027]::ErrorGuaranteed>, rustc_driver_impl[953ac255d00f3c7f]::run_compiler::{closure#1}>::{closure#0}, core[24a2ba61524efef7]::result::Result<(), rustc_span[c85fb125fe1c027]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[24a2ba61524efef7]::result::Result<(), rustc_span[c85fb125fe1c027]::ErrorGuaranteed>>::{closure#1} as core[24a2ba61524efef7]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x7f1375b75445 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h021e65daf5fb4ee0
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/alloc/src/boxed.rs:2007:9
  38:     0x7f1375b75445 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7dda744b120f2954
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/alloc/src/boxed.rs:2007:9
  39:     0x7f1375b75445 - std::sys::unix::thread::Thread::new::thread_start::hcffeb1067f9b6dfb
                               at /rustc/db7ff98a72f3e742b641f9cb16d0e8c285e87e9b/library/std/src/sys/unix/thread.rs:108:17
  40:     0x7f1375a35609 - start_thread
  41:     0x7f137595a133 - clone
  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: please attach the file at `/home/rustc-ice-2023-08-01T04:57:52.97289344Z-227.txt` to your bug report

query stack during panic:
end of query stack
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0391`.

[matthiaskrgr]

probably duplicate of #111176

[Luk-ESC]

This got resolved with #111580. On nightly this doesn't cause an ICE anymore but an error, as intended.

[lqd]

great, closing.