ICE: index out of bounds: the len is 0 but the index is 0 in emitter.rs

[dvdsk]

I am still working on a minimal example however that takes a bit more time. I checked whether this is a duplicate but I would like have a second opinion before I continue as I have missed duplicates in the past :( . Once I have that I will minimize this further. I also would not mind taking a crack at fixing this one (I might need some mentor ship though).

Code

See this commit: dvdsk/dbstruct@744167d the ICE happens when running cargo test simple_impl.

<code>

Meta

rustc --version --verbose:

rustc 1.64.0-nightly (affe0d3a0 2022-08-05)
binary: rustc
commit-hash: affe0d3a00e92fa7885e3f5d2c5073fde432d154
commit-date: 2022-08-05
host: x86_64-unknown-linux-gnu
release: 1.64.0-nightly
LLVM version: 14.0.6

Error output

thread 'rustc' panicked at 'index out of bounds: the len is 0 but the index is 0', compiler/rustc_errors/src/emitter.rs:2161:48

Backtrace

stack backtrace:
   0:     0x7fa09e86f9f0 - std::backtrace_rs::backtrace::libunwind::trace::h74f2a0cc6b6b0bc5
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   1:     0x7fa09e86f9f0 - std::backtrace_rs::backtrace::trace_unsynchronized::h06f3d1adbfc08eec
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fa09e86f9f0 - std::sys_common::backtrace::_print_fmt::he5f15b7310953827
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7fa09e86f9f0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0481eccec82d418c
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7fa09e8cb3bc - core::fmt::write::h609cae14de3da602
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/core/src/fmt/mod.rs:1198:17
   5:     0x7fa09e860a35 - std::io::Write::write_fmt::h01e5a38c3656642d
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/io/mod.rs:1672:15
   6:     0x7fa09e8726d1 - std::sys_common::backtrace::_print::h7b5df4d8c3756e42
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7fa09e8726d1 - std::sys_common::backtrace::print::h9d73a5d917f22346
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7fa09e8726d1 - std::panicking::default_hook::{{closure}}::hcf9a8bcb350b3a14
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/panicking.rs:295:22
   9:     0x7fa09e87239e - std::panicking::default_hook::hfcc6873a008cb403
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/panicking.rs:314:9
  10:     0x7fa0a10eabe4 - rustc_driver[ca7fdc4c44e2051e]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7fa09e872f06 - std::panicking::rust_panic_with_hook::h4a279a71d839a82c
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/panicking.rs:702:17
  12:     0x7fa09e872d57 - std::panicking::begin_panic_handler::{{closure}}::hdef87ce1687e2bad
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/panicking.rs:588:13
  13:     0x7fa09e86ff14 - std::sys_common::backtrace::__rust_end_short_backtrace::h8ecba80cf5d4bb38
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/sys_common/backtrace.rs:138:18
  14:     0x7fa09e872a82 - rust_begin_unwind
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/panicking.rs:584:5
  15:     0x7fa09e8c7e93 - core::panicking::panic_fmt::hba83f67c5144f30e
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/core/src/panicking.rs:142:14
  16:     0x7fa09e8c7dd2 - core::panicking::panic_bounds_check::h1cdec23f81d8a2a9
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/core/src/panicking.rs:84:5
  17:     0x7fa0a0df723d - <rustc_errors[7749712bdedc646d]::emitter::EmitterWriter>::draw_code_line
  18:     0x7fa0a0df3149 - <rustc_errors[7749712bdedc646d]::emitter::EmitterWriter as rustc_errors[7749712bdedc646d]::emitter::Emitter>::emit_diagnostic
  19:     0x7fa0a0ec4503 - <rustc_errors[7749712bdedc646d]::json::Diagnostic>::from_errors_diagnostic
  20:     0x7fa0a0ec3c2e - <rustc_errors[7749712bdedc646d]::json::JsonEmitter as rustc_errors[7749712bdedc646d]::emitter::Emitter>::emit_diagnostic
  21:     0x7fa09fb42db1 - <rustc_errors[7749712bdedc646d]::HandlerInner>::emit_diagnostic
  22:     0x7fa09fa830f1 - <rustc_errors[7749712bdedc646d]::Handler>::emit_diagnostic
  23:     0x7fa0a028a39d - <rustc_errors[7749712bdedc646d]::ErrorGuaranteed as rustc_errors[7749712bdedc646d]::diagnostic_builder::EmissionGuarantee>::diagnostic_builder_emit_producing_guarantee
  24:     0x7fa0a08f12d6 - <rustc_resolve[352a3d4039238523]::Resolver>::report_errors
  25:     0x7fa0a08d676b - <rustc_session[9f63a6f55f156fe5]::session::Session>::time::<(), <rustc_resolve[352a3d4039238523]::Resolver>::resolve_crate::{closure#0}>
  26:     0x7fa0a08d3517 - <rustc_interface[3d3dd0fc21522ad9]::passes::boxed_resolver::BoxedResolver>::access::<<rustc_interface[3d3dd0fc21522ad9]::queries::Queries>::expansion::{closure#0}::{closure#0}, core[ff7cb6048b1d9418]::result::Result<rustc_ast[34ae140d2240e6c3]::ast::Crate, rustc_errors[7749712bdedc646d]::ErrorGuaranteed>>
  27:     0x7fa0a08c524d - <rustc_interface[3d3dd0fc21522ad9]::queries::Queries>::expansion
  28:     0x7fa0a08c2a3d - <rustc_interface[3d3dd0fc21522ad9]::interface::Compiler>::enter::<rustc_driver[ca7fdc4c44e2051e]::run_compiler::{closure#1}::{closure#2}, core[ff7cb6048b1d9418]::result::Result<core[ff7cb6048b1d9418]::option::Option<rustc_interface[3d3dd0fc21522ad9]::queries::Linker>, rustc_errors[7749712bdedc646d]::ErrorGuaranteed>>
  29:     0x7fa0a08b65ca - rustc_span[b823e81b2ca00566]::with_source_map::<core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>, rustc_interface[3d3dd0fc21522ad9]::interface::create_compiler_and_run<core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>, rustc_driver[ca7fdc4c44e2051e]::run_compiler::{closure#1}>::{closure#1}>
  30:     0x7fa0a08b5fa0 - rustc_interface[3d3dd0fc21522ad9]::interface::create_compiler_and_run::<core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>, rustc_driver[ca7fdc4c44e2051e]::run_compiler::{closure#1}>
  31:     0x7fa0a08b4311 - <scoped_tls[1695127579464aca]::ScopedKey<rustc_span[b823e81b2ca00566]::SessionGlobals>>::set::<rustc_interface[3d3dd0fc21522ad9]::interface::run_compiler<core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>, rustc_driver[ca7fdc4c44e2051e]::run_compiler::{closure#1}>::{closure#0}, core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>>
  32:     0x7fa0a08b3fff - std[42edab32bc6d989e]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[3d3dd0fc21522ad9]::util::run_in_thread_pool_with_globals<rustc_interface[3d3dd0fc21522ad9]::interface::run_compiler<core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>, rustc_driver[ca7fdc4c44e2051e]::run_compiler::{closure#1}>::{closure#0}, core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>>::{closure#0}, core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>>
  33:     0x7fa0a0f0d7d9 - <<std[42edab32bc6d989e]::thread::Builder>::spawn_unchecked_<rustc_interface[3d3dd0fc21522ad9]::util::run_in_thread_pool_with_globals<rustc_interface[3d3dd0fc21522ad9]::interface::run_compiler<core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>, rustc_driver[ca7fdc4c44e2051e]::run_compiler::{closure#1}>::{closure#0}, core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>>::{closure#0}, core[ff7cb6048b1d9418]::result::Result<(), rustc_errors[7749712bdedc646d]::ErrorGuaranteed>>::{closure#1} as core[ff7cb6048b1d9418]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7fa09e87ced3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf47b126657473903
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/alloc/src/boxed.rs:1935:9
  35:     0x7fa09e87ced3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h674e0463c0783734
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/alloc/src/boxed.rs:1935:9
  36:     0x7fa09e87ced3 - std::sys::unix::thread::Thread::new::thread_start::ha7dc26e0bc2fdd91
                               at /rustc/affe0d3a00e92fa7885e3f5d2c5073fde432d154/library/std/src/sys/unix/thread.rs:108:17
  37:     0x7fa09e494b43 - <unknown>
  38:     0x7fa09e526a00 - <unknown>
  39:                0x0 - <unknown>