Compiler panic

[MendyBerger]

Code

#![feature(no_core)]
#![feature(lang_items)]

#![no_core]

#[no_mangle]
pub fn add(a: u32) -> u32 {
    a
}

#[lang = "sized"]
pub trait Sized {}

#[lang = "copy"]
pub trait Copy {}

Meta

rustc --version --verbose:

1.61.0-nightly

Error output

   Compiling playground v0.0.1 (/playground)
error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: broken MIR in DefId(0:1 ~ playground[4992]::add) (NoSolution): could not prove Binder(TraitPredicate(<u32 as Copy>, polarity:Positive), [])
  |
  = note: delayed at compiler/rustc_borrowck/src/type_check/canonical.rs:150:13

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1291:13
stack backtrace:
   0:     0x7f1b43d6978d - std::backtrace_rs::backtrace::libunwind::trace::h784cb64f77c799e4
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f1b43d6978d - std::backtrace_rs::backtrace::trace_unsynchronized::h37d0a08044f629a8
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f1b43d6978d - std::sys_common::backtrace::_print_fmt::h3feb324fd310b9a7
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f1b43d6978d - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h4f4e4f67069248d8
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f1b43dc336c - core::fmt::write::hcec4c22fb8220a38
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/core/src/fmt/mod.rs:1190:17
   5:     0x7f1b43d5ad91 - std::io::Write::write_fmt::haaf00a8ebef82d08
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/io/mod.rs:1655:15
   6:     0x7f1b43d6c875 - std::sys_common::backtrace::_print::h338729c4a2a845af
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f1b43d6c875 - std::sys_common::backtrace::print::h23fec30a3fa57965
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f1b43d6c875 - std::panicking::default_hook::{{closure}}::h949b3457e1194801
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/panicking.rs:295:22
   9:     0x7f1b43d6c529 - std::panicking::default_hook::he41e7411e1168615
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/panicking.rs:314:9
  10:     0x7f1b44507d51 - rustc_driver[90e3bd7925538a32]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f1b43d6cfc0 - std::panicking::rust_panic_with_hook::h186acfbc6602cc8e
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/panicking.rs:702:17
  12:     0x7f1b4559f431 - std[4fb2078a936f5865]::panicking::begin_panic::<rustc_errors[9ec17d26f4ea7f9f]::ExplicitBug>::{closure#0}
  13:     0x7f1b4559f316 - std[4fb2078a936f5865]::sys_common::backtrace::__rust_end_short_backtrace::<std[4fb2078a936f5865]::panicking::begin_panic<rustc_errors[9ec17d26f4ea7f9f]::ExplicitBug>::{closure#0}, !>
  14:     0x7f1b455a616f - std[4fb2078a936f5865]::panicking::begin_panic::<rustc_errors[9ec17d26f4ea7f9f]::ExplicitBug>
  15:     0x7f1b455b2a76 - std[4fb2078a936f5865]::panic::panic_any::<rustc_errors[9ec17d26f4ea7f9f]::ExplicitBug>
  16:     0x7f1b46c42a0c - <rustc_errors[9ec17d26f4ea7f9f]::HandlerInner as core[ac30665fb42186d6]::ops::drop::Drop>::drop
  17:     0x7f1b4637eff8 - core[ac30665fb42186d6]::ptr::drop_in_place::<rustc_session[d419619141ab55a9]::parse::ParseSess>
  18:     0x7f1b46380fca - <alloc[1efc481e87c7491]::rc::Rc<rustc_session[d419619141ab55a9]::session::Session> as core[ac30665fb42186d6]::ops::drop::Drop>::drop
  19:     0x7f1b46369a1d - core[ac30665fb42186d6]::ptr::drop_in_place::<rustc_interface[afe55cb781ad7894]::interface::Compiler>
  20:     0x7f1b46368fe4 - rustc_span[571b4d67342d6e5]::with_source_map::<core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>, rustc_interface[afe55cb781ad7894]::interface::create_compiler_and_run<core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>, rustc_driver[90e3bd7925538a32]::run_compiler::{closure#1}>::{closure#1}>
  21:     0x7f1b46368614 - rustc_interface[afe55cb781ad7894]::interface::create_compiler_and_run::<core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>, rustc_driver[90e3bd7925538a32]::run_compiler::{closure#1}>
  22:     0x7f1b46353752 - <scoped_tls[d205317d44737de4]::ScopedKey<rustc_span[571b4d67342d6e5]::SessionGlobals>>::set::<rustc_interface[afe55cb781ad7894]::interface::run_compiler<core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>, rustc_driver[90e3bd7925538a32]::run_compiler::{closure#1}>::{closure#0}, core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>>
  23:     0x7f1b46351c0f - std[4fb2078a936f5865]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[afe55cb781ad7894]::util::run_in_thread_pool_with_globals<rustc_interface[afe55cb781ad7894]::interface::run_compiler<core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>, rustc_driver[90e3bd7925538a32]::run_compiler::{closure#1}>::{closure#0}, core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>>::{closure#0}, core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>>
  24:     0x7f1b46369d92 - <<std[4fb2078a936f5865]::thread::Builder>::spawn_unchecked_<rustc_interface[afe55cb781ad7894]::util::run_in_thread_pool_with_globals<rustc_interface[afe55cb781ad7894]::interface::run_compiler<core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>, rustc_driver[90e3bd7925538a32]::run_compiler::{closure#1}>::{closure#0}, core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>>::{closure#0}, core[ac30665fb42186d6]::result::Result<(), rustc_errors[9ec17d26f4ea7f9f]::ErrorGuaranteed>>::{closure#1} as core[ac30665fb42186d6]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  25:     0x7f1b43d771b3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7b6172238cf57322
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/alloc/src/boxed.rs:1853:9
  26:     0x7f1b43d771b3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h921b28757b015a0f
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/alloc/src/boxed.rs:1853:9
  27:     0x7f1b43d771b3 - std::sys::unix::thread::Thread::new::thread_start::h8d09f4ba73ff0419
                               at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/sys/unix/thread.rs:108:17
  28:     0x7f1b43ca7609 - start_thread
  29:     0x7f1b43bc0163 - clone
  30:                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 1.61.0-nightly (8d60bf427 2022-03-19) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -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`

Backtrace

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1291:13
stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
   1: std::panic::panic_any::<rustc_errors::ExplicitBug>
   2: <rustc_errors::HandlerInner as core::ops::drop::Drop>::drop
   3: core::ptr::drop_in_place::<rustc_session::parse::ParseSess>
   4: <alloc::rc::Rc<rustc_session::session::Session> as core::ops::drop::Drop>::drop
   5: core::ptr::drop_in_place::<rustc_interface::interface::Compiler>
   6: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
   7: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>
   8: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Playground link https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=a0836f05be8de1341876d601e7af8fa2

Note: not getting error with nightly-2022-01-01

[SparrowLii]

Statement impl Copy for u32 {} is necessary since you use #![no_core]

[MendyBerger]

Thanks @SparrowLii! This seems to resolve the issue, should I close this issue or should I keep it open since the compiler shouldn't panic even in this case?

[SparrowLii]

This issue appears to be a duplicate of #92495. Personally think this issue can be closed