failed to get layout for [type error]: the type [type error] has an unknown layout

[mejrs]

Code

fn main() {
    while {} {}
}

Playground

Original example that triggered this:

fn main() {
    let mut x: u8 = 0;
    while {
        print!("yay ");
        x += (x + 1) - x;
        x < 10;
    } {}
}

Meta

It exists on stable, beta and nightly.

rustc --version --verbose:

rustc 1.60.0-nightly (1e12aef3f 2022-02-13) running on x86_64-unknown-linux-gnu

Error output

Compiling playground v0.0.1 (/playground)
error: internal compiler error: compiler/rustc_codegen_llvm/src/context.rs:912:13: failed to get layout for `[type error]`: the type `[type error]` has an unknown layout
 [--> src/main.rs:1:1
](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021#)  |
1 | fn main() {
  | ^^^^^^^^^

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/compiler/rustc_errors/src/lib.rs:1106:9

Backtrace

stack backtrace:
   0:     0x7fb656804b5c - std::backtrace_rs::backtrace::libunwind::trace::h38d656af46687c91
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fb656804b5c - std::backtrace_rs::backtrace::trace_unsynchronized::h6463e81b43d545da
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fb656804b5c - std::sys_common::backtrace::_print_fmt::h7d0aeff1635ad318
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7fb656804b5c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he9ed9f7bc97615c6
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7fb65686667c - core::fmt::write::h26fb070fd492e04f
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/core/src/fmt/mod.rs:1190:17
   5:     0x7fb6567f4ed8 - std::io::Write::write_fmt::ha7a1cfea3d855428
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/io/mod.rs:1657:15
   6:     0x7fb656808ad7 - std::sys_common::backtrace::_print::h6a43ee74b02286e0
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7fb656808ad7 - std::sys_common::backtrace::print::hfe9d3eef26a9b46f
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7fb656808ad7 - std::panicking::default_hook::{{closure}}::he3bbb991ed25ca71
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/panicking.rs:295:22
   9:     0x7fb65680879f - std::panicking::default_hook::h4e425f0c50c308bd
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/panicking.rs:314:9
  10:     0x7fb656f94cb1 - rustc_driver[a91e56fa9d42f309]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7fb6568093b5 - std::panicking::rust_panic_with_hook::h22c18dec3fc9e708
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/panicking.rs:702:17
  12:     0x7fb6570d2c21 - std[b153a624bb710ba]::panicking::begin_panic::<rustc_errors[73a3c157b3209785]::ExplicitBug>::{closure#0}
  13:     0x7fb6570d2a76 - std[b153a624bb710ba]::sys_common::backtrace::__rust_end_short_backtrace::<std[b153a624bb710ba]::panicking::begin_panic<rustc_errors[73a3c157b3209785]::ExplicitBug>::{closure#0}, !>
  14:     0x7fb657109a96 - std[b153a624bb710ba]::panicking::begin_panic::<rustc_errors[73a3c157b3209785]::ExplicitBug>
  15:     0x7fb657109356 - std[b153a624bb710ba]::panic::panic_any::<rustc_errors[73a3c157b3209785]::ExplicitBug>
  16:     0x7fb657106548 - <rustc_errors[73a3c157b3209785]::HandlerInner>::span_bug::<rustc_span[cd0e477a0d9055ec]::span_encoding::Span>
  17:     0x7fb657106220 - <rustc_errors[73a3c157b3209785]::Handler>::span_bug::<rustc_span[cd0e477a0d9055ec]::span_encoding::Span>
  18:     0x7fb6570f33b8 - rustc_middle[cc566e06f15dafa0]::ty::context::tls::with_opt::<rustc_middle[cc566e06f15dafa0]::util::bug::opt_span_bug_fmt<rustc_span[cd0e477a0d9055ec]::span_encoding::Span>::{closure#0}, ()>
  19:     0x7fb6570f3470 - rustc_middle[cc566e06f15dafa0]::util::bug::opt_span_bug_fmt::<rustc_span[cd0e477a0d9055ec]::span_encoding::Span>
  20:     0x7fb6570f343c - rustc_middle[cc566e06f15dafa0]::util::bug::span_bug_fmt::<rustc_span[cd0e477a0d9055ec]::span_encoding::Span>
  21:     0x7fb6570c2b94 - <rustc_codegen_llvm[ce7fced1d54ea27c]::context::CodegenCx as rustc_middle[cc566e06f15dafa0]::ty::layout::LayoutOfHelpers>::handle_layout_err
  22:     0x7fb6570c62b1 - <rustc_codegen_llvm[ce7fced1d54ea27c]::context::CodegenCx as rustc_middle[cc566e06f15dafa0]::ty::layout::LayoutOf>::spanned_layout_of::{closure#0}
  23:     0x7fb6581e855c - <core[62aaa051b59bb8a7]::iter::adapters::map::Map<core[62aaa051b59bb8a7]::slice::iter::Iter<rustc_middle[cc566e06f15dafa0]::mir::LocalDecl>, rustc_codegen_ssa[c5eabbff9f30fa84]::mir::analyze::non_ssa_locals<rustc_codegen_llvm[ce7fced1d54ea27c]::builder::Builder>::{closure#0}> as core[62aaa051b59bb8a7]::iter::traits::iterator::Iterator>::fold::<(), core[62aaa051b59bb8a7]::iter::traits::iterator::Iterator::for_each::call<rustc_codegen_ssa[c5eabbff9f30fa84]::mir::analyze::LocalKind, <alloc[5fc1b733952c8f94]::vec::Vec<rustc_codegen_ssa[c5eabbff9f30fa84]::mir::analyze::LocalKind> as alloc[5fc1b733952c8f94]::vec::spec_extend::SpecExtend<rustc_codegen_ssa[c5eabbff9f30fa84]::mir::analyze::LocalKind, core[62aaa051b59bb8a7]::iter::adapters::map::Map<core[62aaa051b59bb8a7]::slice::iter::Iter<rustc_middle[cc566e06f15dafa0]::mir::LocalDecl>, rustc_codegen_ssa[c5eabbff9f30fa84]::mir::analyze::non_ssa_locals<rustc_codegen_llvm[ce7fced1d54ea27c]::builder::Builder>::{closure#0}>>>::spec_extend::{closure#0}>::{closure#0}>
  24:     0x7fb65823bcbe - rustc_codegen_ssa[c5eabbff9f30fa84]::mir::analyze::non_ssa_locals::<rustc_codegen_llvm[ce7fced1d54ea27c]::builder::Builder>
  25:     0x7fb65821a529 - rustc_codegen_ssa[c5eabbff9f30fa84]::mir::codegen_mir::<rustc_codegen_llvm[ce7fced1d54ea27c]::builder::Builder>
  26:     0x7fb6581dab52 - rustc_codegen_llvm[ce7fced1d54ea27c]::base::compile_codegen_unit::module_codegen
  27:     0x7fb658e7a436 - <rustc_query_system[4f5991938760a368]::dep_graph::graph::DepGraph<rustc_middle[cc566e06f15dafa0]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[cc566e06f15dafa0]::ty::context::TyCtxt, rustc_span[cd0e477a0d9055ec]::symbol::Symbol, rustc_codegen_ssa[c5eabbff9f30fa84]::ModuleCodegen<rustc_codegen_llvm[ce7fced1d54ea27c]::ModuleLlvm>>
  28:     0x7fb658e765de - rustc_codegen_llvm[ce7fced1d54ea27c]::base::compile_codegen_unit
  29:     0x7fb658ea305e - <rustc_codegen_llvm[ce7fced1d54ea27c]::LlvmCodegenBackend as rustc_codegen_ssa[c5eabbff9f30fa84]::traits::backend::CodegenBackend>::codegen_crate
  30:     0x7fb658e31337 - <rustc_session[5d2f28b07d0c8873]::session::Session>::time::<alloc[5fc1b733952c8f94]::boxed::Box<dyn core[62aaa051b59bb8a7]::any::Any>, rustc_interface[cc122fef18c9905d]::passes::start_codegen::{closure#0}>
  31:     0x7fb658e4f4cc - <rustc_interface[cc122fef18c9905d]::passes::QueryContext>::enter::<<rustc_interface[cc122fef18c9905d]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[62aaa051b59bb8a7]::result::Result<alloc[5fc1b733952c8f94]::boxed::Box<dyn core[62aaa051b59bb8a7]::any::Any>, rustc_errors[73a3c157b3209785]::ErrorReported>>
  32:     0x7fb658e45e7f - <rustc_interface[cc122fef18c9905d]::queries::Queries>::ongoing_codegen
  33:     0x7fb658e1097b - rustc_interface[cc122fef18c9905d]::interface::create_compiler_and_run::<core[62aaa051b59bb8a7]::result::Result<(), rustc_errors[73a3c157b3209785]::ErrorReported>, rustc_driver[a91e56fa9d42f309]::run_compiler::{closure#1}>
  34:     0x7fb658df6052 - std[b153a624bb710ba]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[cc122fef18c9905d]::util::run_in_thread_pool_with_globals<rustc_interface[cc122fef18c9905d]::interface::run_compiler<core[62aaa051b59bb8a7]::result::Result<(), rustc_errors[73a3c157b3209785]::ErrorReported>, rustc_driver[a91e56fa9d42f309]::run_compiler::{closure#1}>::{closure#0}, core[62aaa051b59bb8a7]::result::Result<(), rustc_errors[73a3c157b3209785]::ErrorReported>>::{closure#0}, core[62aaa051b59bb8a7]::result::Result<(), rustc_errors[73a3c157b3209785]::ErrorReported>>
  35:     0x7fb658e29169 - <<std[b153a624bb710ba]::thread::Builder>::spawn_unchecked_<rustc_interface[cc122fef18c9905d]::util::run_in_thread_pool_with_globals<rustc_interface[cc122fef18c9905d]::interface::run_compiler<core[62aaa051b59bb8a7]::result::Result<(), rustc_errors[73a3c157b3209785]::ErrorReported>, rustc_driver[a91e56fa9d42f309]::run_compiler::{closure#1}>::{closure#0}, core[62aaa051b59bb8a7]::result::Result<(), rustc_errors[73a3c157b3209785]::ErrorReported>>::{closure#0}, core[62aaa051b59bb8a7]::result::Result<(), rustc_errors[73a3c157b3209785]::ErrorReported>>::{closure#1} as core[62aaa051b59bb8a7]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  36:     0x7fb656815243 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h353fa42c42b20ec5
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/alloc/src/boxed.rs:1854:9
  37:     0x7fb656815243 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0930c1c2fa5dac80
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/alloc/src/boxed.rs:1854:9
  38:     0x7fb656815243 - std::sys::unix::thread::Thread::new::thread_start::hb3ede8336acd4f71
                               at /rustc/1e12aef3fab243407f9d71ba9956cb2a1bf105d5/library/std/src/sys/unix/thread.rs:108:17
  39:     0x7fb656749609 - start_thread
  40:     0x7fb656663293 - clone
  41:                0x0 - <unknown>

note: the compiler unexpectedly panicked. this is a bug.

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: rustc 1.60.0-nightly (1e12aef3f 2022-02-13) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type bin -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: could not compile `playground`

[5225225]

Bisected this

searched toolchains dd549dc through 6d246f0

---

Regression in 9adfd9d

---

searched nightlies: from nightly-2019-11-20 to nightly-2022-02-06
regressed nightly: nightly-2021-11-27
searched commit range: dd549dc...6d246f0
regressed commit: 9adfd9d

bisected with cargo-bisect-rustc v0.6.1

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc --regress ice --start 2019-11-20 -- build 

The code was just

fn main() {
    while {} {}
}

[compiler-errors]

@rustbot claim