ICE: predicates_of.rs: no entry found for key #119275
Description
auto-reduced (treereduce-rust):
#![feature(generic_const_exprs)] fn bug<const N: Nat>(&self) where for<const N: usize = 3, T = u32> [(); COT::BYTES]:, { } original:
//~^ ERROR expected value, found type parameter `T` // see comment on `tests/ui/const-generics/late-bound-vars/simple.rs` #![feature(generic_const_exprs)] #![allow(do_one_stuff)] fn bug<const N: Nat>(&self, other: &UnionDerive) where for<const N: usize=3, T=u32> [(); COT::BYTES]: {} fn foo() where [(); std::mem::size_of::<Self::Assoc>()]: , { Self::AssocInstance == [(); std::mem::size_of::<Self::Assoc>()]; //~^ Error: mismatched types }Version information
rustc 1.77.0-nightly (cf6427373 2023-12-24) binary: rustc commit-hash: cf6427373b8b6d4b8efed2087fb9df5149e69e67 commit-date: 2023-12-24 host: x86_64-unknown-linux-gnu release: 1.77.0-nightly LLVM version: 17.0.6 Command:
/home/matthias/.rustup/toolchains/master/bin/rustc
Program output
error: `self` parameter is only allowed in associated functions --> /tmp/icemaker_global_tempdir.AUy1jkrGRJ1J/rustc_testrunner_tmpdir_reporting.rSMIO4fbDdBQ/mvce.rs:3:22 | 3 | fn bug<const N: Nat>(&self) | ^^^^^ not semantically valid as function parameter | = note: associated functions are those in `impl` or `trait` definitions error[E0412]: cannot find type `Nat` in this scope --> /tmp/icemaker_global_tempdir.AUy1jkrGRJ1J/rustc_testrunner_tmpdir_reporting.rSMIO4fbDdBQ/mvce.rs:3:17 | 3 | fn bug<const N: Nat>(&self) | ^^^ not found in this scope error[E0658]: only lifetime parameters can be used in this context --> /tmp/icemaker_global_tempdir.AUy1jkrGRJ1J/rustc_testrunner_tmpdir_reporting.rSMIO4fbDdBQ/mvce.rs:5:15 | 5 | for<const N: usize = 3, T = u32> [(); COT::BYTES]:, | ^ ^ | = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes --> /tmp/icemaker_global_tempdir.AUy1jkrGRJ1J/rustc_testrunner_tmpdir_reporting.rSMIO4fbDdBQ/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.AUy1jkrGRJ1J/rustc_testrunner_tmpdir_reporting.rSMIO4fbDdBQ/mvce.rs:7:2 | 7 | } | ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.AUy1jkrGRJ1J/rustc_testrunner_tmpdir_reporting.rSMIO4fbDdBQ/mvce.rs` error[E0433]: failed to resolve: use of undeclared type `COT` --> /tmp/icemaker_global_tempdir.AUy1jkrGRJ1J/rustc_testrunner_tmpdir_reporting.rSMIO4fbDdBQ/mvce.rs:5:43 | 5 | for<const N: usize = 3, T = u32> [(); COT::BYTES]:, | ^^^ use of undeclared type `COT` thread 'rustc' panicked at compiler/rustc_hir_analysis/src/collect/predicates_of.rs:543:63: no entry found for key stack backtrace: 0: 0x7f5a803fd6f6 - std::backtrace_rs::backtrace::libunwind::trace::h2df8f9660ecbfbb8 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5 1: 0x7f5a803fd6f6 - std::backtrace_rs::backtrace::trace_unsynchronized::h3dfda5c841f34135 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7f5a803fd6f6 - std::sys_common::backtrace::_print_fmt::h1566197678cf7f77 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/sys_common/backtrace.rs:68:5 3: 0x7f5a803fd6f6 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he9641684f15c91b5 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/sys_common/backtrace.rs:44:22 4: 0x7f5a8044ff40 - core::fmt::rt::Argument::fmt::h3f14f2302d260e3c at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/core/src/fmt/rt.rs:142:9 5: 0x7f5a8044ff40 - core::fmt::write::h33dcdf8f1bed97f0 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/core/src/fmt/mod.rs:1120:17 6: 0x7f5a803f14af - std::io::Write::write_fmt::he47c2dac715a911e at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/io/mod.rs:1810:15 7: 0x7f5a803fd4d4 - std::sys_common::backtrace::_print::haaf0fffcc2dbc055 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/sys_common/backtrace.rs:47:5 8: 0x7f5a803fd4d4 - std::sys_common::backtrace::print::hce17663b3c8fab7c at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/sys_common/backtrace.rs:34:9 9: 0x7f5a80400267 - std::panicking::default_hook::{{closure}}::hef18ec08d6f5a83f 10: 0x7f5a803fffc9 - std::panicking::default_hook::h443dc0b1acbc2ca1 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/panicking.rs:292:9 11: 0x7f5a7d15cb5c - std[53b00ee56307c8d9]::panicking::update_hook::<alloc[e6113a8cd7d0e007]::boxed::Box<rustc_driver_impl[a515e2f3625a014]::install_ice_hook::{closure#0}>>::{closure#0} 12: 0x7f5a804009b6 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hbb328bee335e16b4 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/alloc/src/boxed.rs:2029:9 13: 0x7f5a804009b6 - std::panicking::rust_panic_with_hook::h149d61167f037fda at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/panicking.rs:783:13 14: 0x7f5a80400702 - std::panicking::begin_panic_handler::{{closure}}::ha4af7b0b51960b50 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/panicking.rs:657:13 15: 0x7f5a803fdbf6 - std::sys_common::backtrace::__rust_end_short_backtrace::h22ec3fc978589b7d at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/sys_common/backtrace.rs:171:18 16: 0x7f5a80400460 - rust_begin_unwind at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/panicking.rs:645:5 17: 0x7f5a8044c645 - core::panicking::panic_fmt::h33831d9bd6e28a64 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/core/src/panicking.rs:72:14 18: 0x7f5a8044c3f3 - core::panicking::panic_display::hd71e8dcf36fb2b1a at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/core/src/panicking.rs:196:5 19: 0x7f5a8044c3f3 - core::panicking::panic_str::habc106871a97a2a0 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/core/src/panicking.rs:171:5 20: 0x7f5a8044c3f3 - core::option::expect_failed::hb5ff920cf63ac6d4 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/core/src/option.rs:1980:5 21: 0x7f5a7d26a9f5 - <core[5b4ee21ebe1aec85]::iter::adapters::cloned::Cloned<core[5b4ee21ebe1aec85]::iter::adapters::filter::Filter<core[5b4ee21ebe1aec85]::slice::iter::Iter<(rustc_middle[31e3f561a0c946c5]::ty::Clause, rustc_span[f5b302c54ef9060b]::span_encoding::Span)>, rustc_hir_analysis[bafc4c9086b2fee7]::collect::predicates_of::explicit_predicates_of::{closure#2}>> as core[5b4ee21ebe1aec85]::iter::traits::iterator::Iterator>::next 22: 0x7f5a7d20b6ef - rustc_arena[a6e3e48d66904fa5]::outline::<<rustc_arena[a6e3e48d66904fa5]::DroplessArena>::alloc_from_iter<(rustc_middle[31e3f561a0c946c5]::ty::Clause, rustc_span[f5b302c54ef9060b]::span_encoding::Span), core[5b4ee21ebe1aec85]::iter::adapters::cloned::Cloned<core[5b4ee21ebe1aec85]::iter::adapters::filter::Filter<core[5b4ee21ebe1aec85]::slice::iter::Iter<(rustc_middle[31e3f561a0c946c5]::ty::Clause, rustc_span[f5b302c54ef9060b]::span_encoding::Span)>, rustc_hir_analysis[bafc4c9086b2fee7]::collect::predicates_of::explicit_predicates_of::{closure#2}>>>::{closure#0}, &mut [(rustc_middle[31e3f561a0c946c5]::ty::Clause, rustc_span[f5b302c54ef9060b]::span_encoding::Span)]> 23: 0x7f5a7ea15e17 - rustc_query_impl[f5580f8fec7de75e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f5580f8fec7de75e]::query_impl::explicit_predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 24usize]>> 24: 0x7f5a7e50467e - rustc_query_system[62899876b0b3287e]::query::plumbing::try_execute_query::<rustc_query_impl[f5580f8fec7de75e]::DynamicConfig<rustc_query_system[62899876b0b3287e]::query::caches::DefaultCache<rustc_span[f5b302c54ef9060b]::def_id::DefId, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[f5580f8fec7de75e]::plumbing::QueryCtxt, false> 25: 0x7f5a7e504320 - rustc_query_impl[f5580f8fec7de75e]::query_impl::explicit_predicates_of::get_query_non_incr::__rust_end_short_backtrace 26: 0x7f5a7e5051d8 - rustc_hir_analysis[bafc4c9086b2fee7]::collect::predicates_defined_on 27: 0x7f5a7e505095 - rustc_query_impl[f5580f8fec7de75e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f5580f8fec7de75e]::query_impl::predicates_defined_on::dynamic_query::{closure#2}::{closure#0}, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 24usize]>> 28: 0x7f5a7e504653 - rustc_query_system[62899876b0b3287e]::query::plumbing::try_execute_query::<rustc_query_impl[f5580f8fec7de75e]::DynamicConfig<rustc_query_system[62899876b0b3287e]::query::caches::DefaultCache<rustc_span[f5b302c54ef9060b]::def_id::DefId, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[f5580f8fec7de75e]::plumbing::QueryCtxt, false> 29: 0x7f5a7e504160 - rustc_query_impl[f5580f8fec7de75e]::query_impl::predicates_defined_on::get_query_non_incr::__rust_end_short_backtrace 30: 0x7f5a7e50315b - rustc_hir_analysis[bafc4c9086b2fee7]::collect::predicates_of::predicates_of 31: 0x7f5a7e503013 - rustc_query_impl[f5580f8fec7de75e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f5580f8fec7de75e]::query_impl::predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 24usize]>> 32: 0x7f5a7e504626 - rustc_query_system[62899876b0b3287e]::query::plumbing::try_execute_query::<rustc_query_impl[f5580f8fec7de75e]::DynamicConfig<rustc_query_system[62899876b0b3287e]::query::caches::DefaultCache<rustc_span[f5b302c54ef9060b]::def_id::DefId, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[f5580f8fec7de75e]::plumbing::QueryCtxt, false> 33: 0x7f5a7e50423e - rustc_query_impl[f5580f8fec7de75e]::query_impl::predicates_of::get_query_non_incr::__rust_end_short_backtrace 34: 0x7f5a7e9f2c17 - rustc_ty_utils[626d69ea2a15dcb]::ty::param_env 35: 0x7f5a7e9f2107 - rustc_query_impl[f5580f8fec7de75e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f5580f8fec7de75e]::query_impl::param_env::dynamic_query::{closure#2}::{closure#0}, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 8usize]>> 36: 0x7f5a7e490c94 - rustc_query_system[62899876b0b3287e]::query::plumbing::try_execute_query::<rustc_query_impl[f5580f8fec7de75e]::DynamicConfig<rustc_query_system[62899876b0b3287e]::query::caches::DefaultCache<rustc_span[f5b302c54ef9060b]::def_id::DefId, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[f5580f8fec7de75e]::plumbing::QueryCtxt, false> 37: 0x7f5a7e4907a1 - rustc_query_impl[f5580f8fec7de75e]::query_impl::param_env::get_query_non_incr::__rust_end_short_backtrace 38: 0x7f5a7e734329 - rustc_middle[31e3f561a0c946c5]::query::plumbing::query_get_at::<rustc_query_system[62899876b0b3287e]::query::caches::DefaultCache<rustc_span[f5b302c54ef9060b]::def_id::DefId, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 8usize]>>> 39: 0x7f5a7e72b6fe - rustc_hir_typeck[1fdbbb9070b6fec3]::typeck 40: 0x7f5a7e72b587 - rustc_query_impl[f5580f8fec7de75e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f5580f8fec7de75e]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 8usize]>> 41: 0x7f5a7e5f8403 - rustc_query_system[62899876b0b3287e]::query::plumbing::try_execute_query::<rustc_query_impl[f5580f8fec7de75e]::DynamicConfig<rustc_query_system[62899876b0b3287e]::query::caches::VecCache<rustc_span[f5b302c54ef9060b]::def_id::LocalDefId, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[f5580f8fec7de75e]::plumbing::QueryCtxt, false> 42: 0x7f5a7e5f8090 - rustc_query_impl[f5580f8fec7de75e]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace 43: 0x7f5a7e5f930d - rustc_query_impl[f5580f8fec7de75e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f5580f8fec7de75e]::query_impl::used_trait_imports::dynamic_query::{closure#2}::{closure#0}, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 8usize]>> 44: 0x7f5a7e5f8403 - rustc_query_system[62899876b0b3287e]::query::plumbing::try_execute_query::<rustc_query_impl[f5580f8fec7de75e]::DynamicConfig<rustc_query_system[62899876b0b3287e]::query::caches::VecCache<rustc_span[f5b302c54ef9060b]::def_id::LocalDefId, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[f5580f8fec7de75e]::plumbing::QueryCtxt, false> 45: 0x7f5a7e5f7250 - rustc_query_impl[f5580f8fec7de75e]::query_impl::used_trait_imports::get_query_non_incr::__rust_end_short_backtrace 46: 0x7f5a7e5f7385 - rustc_hir_analysis[bafc4c9086b2fee7]::check_unused::check_unused_traits 47: 0x7f5a7e5f7277 - rustc_query_impl[f5580f8fec7de75e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f5580f8fec7de75e]::query_impl::check_unused_traits::dynamic_query::{closure#2}::{closure#0}, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 0usize]>> 48: 0x7f5a7f2527ad - rustc_query_system[62899876b0b3287e]::query::plumbing::try_execute_query::<rustc_query_impl[f5580f8fec7de75e]::DynamicConfig<rustc_query_system[62899876b0b3287e]::query::caches::SingleCache<rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[f5580f8fec7de75e]::plumbing::QueryCtxt, false> 49: 0x7f5a7f252489 - rustc_query_impl[f5580f8fec7de75e]::query_impl::check_unused_traits::get_query_non_incr::__rust_end_short_backtrace 50: 0x7f5a7ee819e3 - rustc_hir_analysis[bafc4c9086b2fee7]::check_crate 51: 0x7f5a7ec1e5e9 - rustc_interface[bd66f4fa46f746b1]::passes::analysis 52: 0x7f5a7ec1e21d - rustc_query_impl[f5580f8fec7de75e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f5580f8fec7de75e]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 1usize]>> 53: 0x7f5a7f3c9a40 - rustc_query_system[62899876b0b3287e]::query::plumbing::try_execute_query::<rustc_query_impl[f5580f8fec7de75e]::DynamicConfig<rustc_query_system[62899876b0b3287e]::query::caches::SingleCache<rustc_middle[31e3f561a0c946c5]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[f5580f8fec7de75e]::plumbing::QueryCtxt, false> 54: 0x7f5a7f3c9847 - rustc_query_impl[f5580f8fec7de75e]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 55: 0x7f5a7f155bd2 - rustc_interface[bd66f4fa46f746b1]::interface::run_compiler::<core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>, rustc_driver_impl[a515e2f3625a014]::run_compiler::{closure#0}>::{closure#0} 56: 0x7f5a7f3e5146 - std[53b00ee56307c8d9]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[bd66f4fa46f746b1]::util::run_in_thread_with_globals<rustc_interface[bd66f4fa46f746b1]::util::run_in_thread_pool_with_globals<rustc_interface[bd66f4fa46f746b1]::interface::run_compiler<core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>, rustc_driver_impl[a515e2f3625a014]::run_compiler::{closure#0}>::{closure#0}, core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>>::{closure#0}, core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>> 57: 0x7f5a7f3e4f73 - <<std[53b00ee56307c8d9]::thread::Builder>::spawn_unchecked_<rustc_interface[bd66f4fa46f746b1]::util::run_in_thread_with_globals<rustc_interface[bd66f4fa46f746b1]::util::run_in_thread_pool_with_globals<rustc_interface[bd66f4fa46f746b1]::interface::run_compiler<core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>, rustc_driver_impl[a515e2f3625a014]::run_compiler::{closure#0}>::{closure#0}, core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>>::{closure#0}, core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5b4ee21ebe1aec85]::result::Result<(), rustc_span[f5b302c54ef9060b]::ErrorGuaranteed>>::{closure#1} as core[5b4ee21ebe1aec85]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 58: 0x7f5a8040a8e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hcf12dd404666fb67 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/alloc/src/boxed.rs:2015:9 59: 0x7f5a8040a8e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7d300110ecc80b23 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/alloc/src/boxed.rs:2015:9 60: 0x7f5a8040a8e5 - std::sys::unix::thread::Thread::new::thread_start::hbf9dee335531cfc2 at /rustc/cf6427373b8b6d4b8efed2087fb9df5149e69e67/library/std/src/sys/unix/thread.rs:108:17 61: 0x7f5a7a2aa9eb - <unknown> 62: 0x7f5a7a32e7cc - <unknown> 63: 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 1.77.0-nightly (cf6427373 2023-12-24) running on x86_64-unknown-linux-gnu query stack during panic: #0 [explicit_predicates_of] computing explicit predicates of `bug::{constant#1}` #1 [predicates_defined_on] computing predicates of `bug::{constant#1}` #2 [predicates_of] computing predicates of `bug::{constant#1}` #3 [param_env] computing normalized predicates of `bug::{constant#1}` #4 [typeck] type-checking `bug::{constant#1}` #5 [used_trait_imports] finding used_trait_imports `bug::{constant#1}` #6 [check_unused_traits] checking unused trait imports in crate #7 [analysis] running analysis passes on this crate end of query stack error: aborting due to 5 previous errors; 1 warning emitted Some errors have detailed explanations: E0412, E0433, E0601, E0658. For more information about an error, try `rustc --explain E0412`.