error[E0412]: cannot find type `X` in this scope --> /tmp/icemaker_global_tempdir.sibW0J2m6Q7v/rustc_testrunner_tmpdir_reporting.Ixcc7s4ac9zG/mvce.rs:3:22 | 3 | impl<const Z: usize> X<Z> { | ^ not found in this scope warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes --> /tmp/icemaker_global_tempdir.sibW0J2m6Q7v/rustc_testrunner_tmpdir_reporting.Ixcc7s4ac9zG/mvce.rs:1:12 | 1 | #![feature(generic_const_exprs)] | ^^^^^^^^^^^^^^^^^^^ | = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information = note: `#[warn(incomplete_features)]` on by default error[E0601]: `main` function not found in crate `mvce` --> /tmp/icemaker_global_tempdir.sibW0J2m6Q7v/rustc_testrunner_tmpdir_reporting.Ixcc7s4ac9zG/mvce.rs:5:2 | 5 | } | ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.sibW0J2m6Q7v/rustc_testrunner_tmpdir_reporting.Ixcc7s4ac9zG/mvce.rs` error[E0277]: `()` is not an iterator --> /tmp/icemaker_global_tempdir.sibW0J2m6Q7v/rustc_testrunner_tmpdir_reporting.Ixcc7s4ac9zG/mvce.rs:4:38 | 4 | pub fn y<'a, U: 'a>(&'a self) -> impl Iterator<Item = impl Iterator<Item = [u8; Z]> + '_> {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `()` is not an iterator | = help: the trait `Iterator` is not implemented for `()` error: internal compiler error: compiler/rustc_borrowck/src/universal_regions.rs:879:36: cannot convert `ReEarlyParam(DefId(0:11 ~ mvce[3a1b]::{impl#0}::y::{opaque#0}::'_), 3, '_)` to a region vid thread 'rustc' panicked at compiler/rustc_middle/src/util/bug.rs:35:44: Box<dyn Any> stack backtrace: 0: 0x7eff44263af6 - std::backtrace_rs::backtrace::libunwind::trace::h4d16db2f784877bc at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5 1: 0x7eff44263af6 - std::backtrace_rs::backtrace::trace_unsynchronized::h584b4a9b0240fa46 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7eff44263af6 - std::sys_common::backtrace::_print_fmt::hd30229489add2f78 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/sys_common/backtrace.rs:68:5 3: 0x7eff44263af6 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2c0d00d6b7d69808 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/sys_common/backtrace.rs:44:22 4: 0x7eff442b4a7c - core::fmt::rt::Argument::fmt::hff9bfb4853f651d7 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/core/src/fmt/rt.rs:142:9 5: 0x7eff442b4a7c - core::fmt::write::h3421d3f24b10b162 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/core/src/fmt/mod.rs:1120:17 6: 0x7eff442584bf - std::io::Write::write_fmt::hec18e9e87db322bb at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/io/mod.rs:1846:15 7: 0x7eff442638a4 - std::sys_common::backtrace::_print::hec336a3777e68e7b at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/sys_common/backtrace.rs:47:5 8: 0x7eff442638a4 - std::sys_common::backtrace::print::hde3a6d5d13170337 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/sys_common/backtrace.rs:34:9 9: 0x7eff442665eb - std::panicking::default_hook::{{closure}}::h4a4905d59aca1811 10: 0x7eff44266339 - std::panicking::default_hook::h33a18ce8d018f6fd at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/panicking.rs:292:9 11: 0x7eff40e8467c - std[d1f7731e2ff5974d]::panicking::update_hook::<alloc[6711342ad6595d8]::boxed::Box<rustc_driver_impl[db1009755931a507]::install_ice_hook::{closure#0}>>::{closure#0} 12: 0x7eff44266d50 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h923e5082c0e2f790 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/alloc/src/boxed.rs:2030:9 13: 0x7eff44266d50 - std::panicking::rust_panic_with_hook::he294011ca89c3e63 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/panicking.rs:783:13 14: 0x7eff40eb0d24 - std[d1f7731e2ff5974d]::panicking::begin_panic::<rustc_errors[8efb6f95facf2fed]::ExplicitBug>::{closure#0} 15: 0x7eff40eadc46 - std[d1f7731e2ff5974d]::sys_common::backtrace::__rust_end_short_backtrace::<std[d1f7731e2ff5974d]::panicking::begin_panic<rustc_errors[8efb6f95facf2fed]::ExplicitBug>::{closure#0}, !> 16: 0x7eff40ead926 - std[d1f7731e2ff5974d]::panicking::begin_panic::<rustc_errors[8efb6f95facf2fed]::ExplicitBug> 17: 0x7eff40eba711 - <rustc_errors[8efb6f95facf2fed]::diagnostic::BugAbort as rustc_errors[8efb6f95facf2fed]::diagnostic::EmissionGuarantee>::emit_producing_guarantee 18: 0x7eff41291f9c - <rustc_errors[8efb6f95facf2fed]::DiagCtxt>::bug::<alloc[6711342ad6595d8]::string::String> 19: 0x7eff41336d6b - rustc_middle[10e0138f1f482b76]::util::bug::opt_span_bug_fmt::<rustc_span[6ccc48fe7a4f1f83]::span_encoding::Span>::{closure#0} 20: 0x7eff4131a5ba - rustc_middle[10e0138f1f482b76]::ty::context::tls::with_opt::<rustc_middle[10e0138f1f482b76]::util::bug::opt_span_bug_fmt<rustc_span[6ccc48fe7a4f1f83]::span_encoding::Span>::{closure#0}, !>::{closure#0} 21: 0x7eff4131a438 - rustc_middle[10e0138f1f482b76]::ty::context::tls::with_context_opt::<rustc_middle[10e0138f1f482b76]::ty::context::tls::with_opt<rustc_middle[10e0138f1f482b76]::util::bug::opt_span_bug_fmt<rustc_span[6ccc48fe7a4f1f83]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !> 22: 0x7eff3f751440 - rustc_middle[10e0138f1f482b76]::util::bug::bug_fmt 23: 0x7eff4384c71c - <rustc_borrowck[aaa85fbefb30244]::universal_regions::UniversalRegionIndices>::to_region_vid.cold.0 24: 0x7eff3fcbe77d - rustc_borrowck[aaa85fbefb30244]::type_check::type_check 25: 0x7eff3fca27fc - rustc_borrowck[aaa85fbefb30244]::nll::compute_regions 26: 0x7eff42fec06b - rustc_borrowck[aaa85fbefb30244]::do_mir_borrowck 27: 0x7eff42fdea9e - rustc_borrowck[aaa85fbefb30244]::mir_borrowck 28: 0x7eff42fde557 - rustc_query_impl[5f3fca9184d705d1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5f3fca9184d705d1]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[10e0138f1f482b76]::query::erase::Erased<[u8; 8usize]>> 29: 0x7eff4246bc30 - rustc_query_system[3c44b3ad726fdf36]::query::plumbing::try_execute_query::<rustc_query_impl[5f3fca9184d705d1]::DynamicConfig<rustc_query_system[3c44b3ad726fdf36]::query::caches::VecCache<rustc_span[6ccc48fe7a4f1f83]::def_id::LocalDefId, rustc_middle[10e0138f1f482b76]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5f3fca9184d705d1]::plumbing::QueryCtxt, false> 30: 0x7eff4246b80c - rustc_query_impl[5f3fca9184d705d1]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace 31: 0x7eff42dedecc - rustc_interface[94ec20dfe64cdcea]::passes::analysis 32: 0x7eff42ded9d9 - rustc_query_impl[5f3fca9184d705d1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5f3fca9184d705d1]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[10e0138f1f482b76]::query::erase::Erased<[u8; 1usize]>> 33: 0x7eff42f25643 - rustc_query_system[3c44b3ad726fdf36]::query::plumbing::try_execute_query::<rustc_query_impl[5f3fca9184d705d1]::DynamicConfig<rustc_query_system[3c44b3ad726fdf36]::query::caches::SingleCache<rustc_middle[10e0138f1f482b76]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[5f3fca9184d705d1]::plumbing::QueryCtxt, false> 34: 0x7eff42f253bf - rustc_query_impl[5f3fca9184d705d1]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 35: 0x7eff42f34896 - rustc_interface[94ec20dfe64cdcea]::interface::run_compiler::<core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>, rustc_driver_impl[db1009755931a507]::run_compiler::{closure#0}>::{closure#0} 36: 0x7eff431caa4d - std[d1f7731e2ff5974d]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[94ec20dfe64cdcea]::util::run_in_thread_with_globals<rustc_interface[94ec20dfe64cdcea]::util::run_in_thread_pool_with_globals<rustc_interface[94ec20dfe64cdcea]::interface::run_compiler<core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>, rustc_driver_impl[db1009755931a507]::run_compiler::{closure#0}>::{closure#0}, core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>>::{closure#0}, core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>> 37: 0x7eff431ca87a - <<std[d1f7731e2ff5974d]::thread::Builder>::spawn_unchecked_<rustc_interface[94ec20dfe64cdcea]::util::run_in_thread_with_globals<rustc_interface[94ec20dfe64cdcea]::util::run_in_thread_pool_with_globals<rustc_interface[94ec20dfe64cdcea]::interface::run_compiler<core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>, rustc_driver_impl[db1009755931a507]::run_compiler::{closure#0}>::{closure#0}, core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>>::{closure#0}, core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[bd87c62ae3a7b4ee]::result::Result<(), rustc_span[6ccc48fe7a4f1f83]::ErrorGuaranteed>>::{closure#1} as core[bd87c62ae3a7b4ee]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 38: 0x7eff44270725 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h11737601996c7bc7 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/alloc/src/boxed.rs:2016:9 39: 0x7eff44270725 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb64bc4a2c7899523 at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/alloc/src/boxed.rs:2016:9 40: 0x7eff44270725 - std::sys::pal::unix::thread::Thread::new::thread_start::h9f6bca54366231ee at /rustc/8f359beca4e58bc3ae795a666301a8f47023044c/library/std/src/sys/pal/unix/thread.rs:108:17 41: 0x7eff3dea955a - <unknown> 42: 0x7eff3df26a3c - <unknown> 43: 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: rustc 1.78.0-nightly (8f359beca 2024-02-23) running on x86_64-unknown-linux-gnu query stack during panic: #0 [mir_borrowck] borrow-checking `<impl at /tmp/icemaker_global_tempdir.sibW0J2m6Q7v/rustc_testrunner_tmpdir_reporting.Ixcc7s4ac9zG/mvce.rs:3:1: 3:26>::y::{constant#0}` #1 [analysis] running analysis passes on this crate end of query stack error: aborting due to 4 previous errors; 1 warning emitted Some errors have detailed explanations: E0277, E0412, E0601. For more information about an error, try `rustc --explain E0277`.