rustc bug - index out of bounds

[bestia-dev]

short summary of the bug:
Unexpectedly the compiler return an error.
I compile on WSL1 Debian on Win10.

I tried this code in this commit:
https://github.com/LucianoBestia/crates_io_database/commit/18b625fe64c4a54d871fc0f21ad6e6994dc11fab

code sample that causes the bug:
I run this command:
$ clear; cargo test

I expected to see this happen:
tests pass or fail.

Instead, this happened:
\

thread 'rustc' panicked at 'index out of bounds: the len is 559 but the index is 560', /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libcore/slice/mod.rs:2842:10
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

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

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.43.0 (4fb7144ed 2020-04-20) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental

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

Meta

rustc --version --verbose:
\

rustc 1.43.0 (4fb7144ed 2020-04-20)
binary: rustc
commit-hash: 4fb7144ed159f94491249e86d5bbd033b5d60550
commit-date: 2020-04-20
host: x86_64-unknown-linux-gnu
release: 1.43.0
LLVM version: 9.0

Backtrace:

stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.heygears.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/libunwind.rs:86
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.heygears.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1063
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1426
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:204
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:224
  10: rustc_driver::report_ice
  11: <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/liballoc/boxed.rs:1031
  12: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}
             at /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libproc_macro/bridge/client.rs:305
  13: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:474
  14: rust_begin_unwind
             at src/libstd/panicking.rs:378
  15: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  16: core::panicking::panic_bounds_check
             at src/libcore/panicking.rs:63
  17: <rustc::ty::query::on_disk_cache::CacheDecoder as serialize::serialize::SpecializedDecoder<rustc_span::span_encoding::Span>>::specialized_decode
  18: <rustc::mir::SourceInfo as serialize::serialize::Decodable>::decode
  19: <rustc::mir::Statement as serialize::serialize::Decodable>::decode
  20: serialize::serialize::Decoder::read_seq
  21: <rustc::mir::BasicBlockData as serialize::serialize::Decodable>::decode
  22: serialize::serialize::Decoder::read_seq
  23: <rustc::mir::Body as serialize::serialize::Decodable>::decode::{{closure}}
  24: rustc::ty::query::on_disk_cache::OnDiskCache::try_load_query_result
  25: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  26: rustc::ty::<impl rustc::ty::context::TyCtxt>::instance_mir
  27: rustc_mir::monomorphize::collector::collect_items_rec
  28: rustc_mir::monomorphize::collector::collect_items_rec
  29: rustc_session::utils::<impl rustc_session::session::Session>::time
  30: rustc_mir::monomorphize::collector::collect_crate_mono_items
  31: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  32: rustc::ty::query::__query_compute::collect_and_partition_mono_items
  33: rustc::dep_graph::graph::DepGraph::with_task_impl
  34: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  35: rustc_codegen_ssa::base::codegen_crate
  36: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_utils::codegen_backend::CodegenBackend>::codegen_crate
  37: rustc_interface::passes::start_codegen
  38: rustc::ty::context::tls::enter_global
  39: rustc_interface::queries::Queries::ongoing_codegen
  40: rustc_interface::interface::run_compiler_in_existing_thread_pool
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: internal compiler error: unexpected panic

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

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.43.0 (4fb7144ed 2020-04-20) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental

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

query stack during panic:
#0 [optimized_mir] processing `qvs20_table_mod::test::test_03_all_wrong_in_schema::{{closure}}#0`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: could not compile `crates_io_database`.

[tesuji]

Cannot reproduce in current nightly: rustc 1.46.0-nightly (6bb3dbf 2020-06-22)
The rustc host was x86_64-unknown-linux-gnu.