ICE: generic_const_exprs: ´assertion failed: self.errors_reported`

[matthiaskrgr]

Code

#![feature(generic_const_exprs)]
pub fn main() {}

impl EntriesBuffer {
    fn a(&self) -> impl Iterator {
        self.0.iter_mut()
    }
}

struct EntriesBuffer(Box<[[u8; HashesEntryLEN]; 5]>);

Meta

rustc --version --verbose:

rustc 1.70.0-nightly (22f247c6f 2023-03-13)
binary: rustc
commit-hash: 22f247c6f3ed388cb702d01c2ff27da658a8b353
commit-date: 2023-03-13
host: x86_64-unknown-linux-gnu
release: 1.70.0-nightly
LLVM version: 15.0.7

Error output

error[E0425]: cannot find value `HashesEntryLEN` in this scope
  --> treereduce.out:10:32
   |
10 | struct EntriesBuffer(Box<[[u8; HashesEntryLEN]; 5]>);
   |                                ^^^^^^^^^^^^^^ not found in this scope

Backtrace

thread 'rustc' panicked at 'assertion failed: self.errors_reported', compiler/rustc_borrowck/src/type_check/mod.rs:533:21
stack backtrace:
   0:     0x7f389356651a - std::backtrace_rs::backtrace::libunwind::trace::h1ac6254167c780d9
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f389356651a - std::backtrace_rs::backtrace::trace_unsynchronized::hec2af85915e24f36
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f389356651a - std::sys_common::backtrace::_print_fmt::h58a4e3535fcce206
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f389356651a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5107e13758b8321c
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f38935c9c5e - core::fmt::write::h2e851dc027730d81
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/core/src/fmt/mod.rs:1232:17
   5:     0x7f3893559375 - std::io::Write::write_fmt::hca00074de9f85084
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/io/mod.rs:1684:15
   6:     0x7f38935662e5 - std::sys_common::backtrace::_print::h870053c845cddf24
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f38935662e5 - std::sys_common::backtrace::print::hb56add862f96c5fd
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f389356905f - std::panicking::default_hook::{{closure}}::h636d4ba3ff8fdc46
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:271:22
   9:     0x7f3893568d9b - std::panicking::default_hook::hf29b58145ee6e43c
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:290:9
  10:     0x7f38968580c5 - <rustc_driver_impl[74350ec99973fded]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[2011dc7817943e09]::ops::function::FnOnce<(&core[2011dc7817943e09]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7f389356989d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7342d57f33f6634f
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/alloc/src/boxed.rs:2002:9
  12:     0x7f389356989d - std::panicking::rust_panic_with_hook::hbf9ef936d990c16f
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:696:13
  13:     0x7f38935695d2 - std::panicking::begin_panic_handler::{{closure}}::h6be6433dcb901f4b
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:581:13
  14:     0x7f3893566986 - std::sys_common::backtrace::__rust_end_short_backtrace::h802b6104a4d80829
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:150:18
  15:     0x7f3893569322 - rust_begin_unwind
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:579:5
  16:     0x7f38935c5fb3 - core::panicking::panic_fmt::hf7a8a88b9669732e
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/core/src/panicking.rs:64:14
  17:     0x7f38935c604d - core::panicking::panic::h23010f9a5cb8b3d2
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/core/src/panicking.rs:114:5
  18:     0x7f38957ed586 - <rustc_borrowck[a500f257ebd25aaf]::type_check::TypeVerifier as rustc_middle[eaae5d2a0b8f0144]::mir::visit::Visitor>::visit_place
  19:     0x7f38957d1bcd - <rustc_borrowck[a500f257ebd25aaf]::type_check::TypeVerifier as rustc_middle[eaae5d2a0b8f0144]::mir::visit::Visitor>::visit_body
  20:     0x7f389577ceab - rustc_borrowck[a500f257ebd25aaf]::nll::compute_regions
  21:     0x7f389574d7c8 - rustc_borrowck[a500f257ebd25aaf]::do_mir_borrowck
  22:     0x7f3895746b4e - rustc_borrowck[a500f257ebd25aaf]::mir_borrowck
  23:     0x7f38959d3ac6 - rustc_query_system[f881c7f40ee7dcf0]::query::plumbing::try_execute_query::<rustc_query_impl[eb95ff51c492efdd]::queries::mir_borrowck, rustc_query_impl[eb95ff51c492efdd]::plumbing::QueryCtxt>
  24:     0x7f38959d36a3 - <rustc_query_impl[eb95ff51c492efdd]::Queries as rustc_middle[eaae5d2a0b8f0144]::ty::query::QueryEngine>::mir_borrowck
  25:     0x7f3895e1c6fb - rustc_hir_analysis[80836a89449caedf]::collect::type_of::type_of
  26:     0x7f389519dc35 - rustc_query_system[f881c7f40ee7dcf0]::query::plumbing::try_execute_query::<rustc_query_impl[eb95ff51c492efdd]::queries::type_of, rustc_query_impl[eb95ff51c492efdd]::plumbing::QueryCtxt>
  27:     0x7f389519c55d - <rustc_query_impl[eb95ff51c492efdd]::Queries as rustc_middle[eaae5d2a0b8f0144]::ty::query::QueryEngine>::type_of
  28:     0x7f389490da3e - rustc_hir_analysis[80836a89449caedf]::check::check::check_mod_item_types
  29:     0x7f3895e9be9e - rustc_query_system[f881c7f40ee7dcf0]::query::plumbing::try_execute_query::<rustc_query_impl[eb95ff51c492efdd]::queries::check_mod_item_types, rustc_query_impl[eb95ff51c492efdd]::plumbing::QueryCtxt>
  30:     0x7f3895e9ba23 - <rustc_query_impl[eb95ff51c492efdd]::Queries as rustc_middle[eaae5d2a0b8f0144]::ty::query::QueryEngine>::check_mod_item_types
  31:     0x7f3894c482c4 - <rustc_session[a360c2d099171c08]::session::Session>::time::<(), rustc_hir_analysis[80836a89449caedf]::check_crate::{closure#6}>
  32:     0x7f3894c45208 - rustc_hir_analysis[80836a89449caedf]::check_crate
  33:     0x7f3894c3b1b2 - rustc_interface[ceda1fd77ec39e1b]::passes::analysis
  34:     0x7f3896076a4c - rustc_query_system[f881c7f40ee7dcf0]::query::plumbing::try_execute_query::<rustc_query_impl[eb95ff51c492efdd]::queries::analysis, rustc_query_impl[eb95ff51c492efdd]::plumbing::QueryCtxt>
  35:     0x7f3896076740 - <rustc_query_impl[eb95ff51c492efdd]::Queries as rustc_middle[eaae5d2a0b8f0144]::ty::query::QueryEngine>::analysis
  36:     0x7f3895e9f789 - <rustc_middle[eaae5d2a0b8f0144]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[74350ec99973fded]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>
  37:     0x7f3895a8ef08 - rustc_span[18b84908941c7cdf]::with_source_map::<core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>, rustc_interface[ceda1fd77ec39e1b]::interface::run_compiler<core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>, rustc_driver_impl[74350ec99973fded]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  38:     0x7f3895a8616c - std[1337fb43929788f1]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ceda1fd77ec39e1b]::util::run_in_thread_pool_with_globals<rustc_interface[ceda1fd77ec39e1b]::interface::run_compiler<core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>, rustc_driver_impl[74350ec99973fded]::run_compiler::{closure#1}>::{closure#0}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>
  39:     0x7f3895a85b9a - <<std[1337fb43929788f1]::thread::Builder>::spawn_unchecked_<rustc_interface[ceda1fd77ec39e1b]::util::run_in_thread_pool_with_globals<rustc_interface[ceda1fd77ec39e1b]::interface::run_compiler<core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>, rustc_driver_impl[74350ec99973fded]::run_compiler::{closure#1}>::{closure#0}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>::{closure#1} as core[2011dc7817943e09]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  40:     0x7f3893573793 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7e0474dd3b8659fa
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/alloc/src/boxed.rs:1988:9
  41:     0x7f3893573793 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::heb8c41cf543a5c11
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/alloc/src/boxed.rs:1988:9
  42:     0x7f3893573793 - std::sys::unix::thread::Thread::new::thread_start::hc791abe67253fe06
                               at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys/unix/thread.rs:108:17
  43:     0x7f3893305bb5 - <unknown>
  44:     0x7f3893387d90 - <unknown>
  45:                0x0 - <unknown>

error: 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 1.70.0-nightly (22f247c6f 2023-03-13) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [mir_borrowck] borrow-checking `<impl at treereduce.out:4:1: 4:19>::a`
#1 [type_of] computing type of `<impl at treereduce.out:4:1: 4:19>::a::{opaque#0}`
#2 [check_mod_item_types] checking item types in top-level module
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0425`.

[matthiaskrgr]

searched toolchains 01fbc5a through 7632db0

---

Regression in f5418b0

---

[JohnTitor]

Triage: Fixed on the latest nightly, @rustbot labels: +E-needs-test