ICE: range start index 2 out of range for slice of length 0', library/core/src/slice/index.rs:52:5

[djc]

Code

Not reduced so far. Can reproduce by checking out the code from https://github.com/InstantDomain/instant-xml/tree/ice and running cargo test (running cargo check is not enough). See the last commit for triggering changes.

Meta

rustc --version --verbose:

rustc 1.63.0 (4b91a6ea7 2022-08-08)
binary: rustc
commit-hash: 4b91a6ea7258a947e59c6522cd5898e7c0a6a88f
commit-date: 2022-08-08
host: aarch64-apple-darwin
release: 1.63.0
LLVM version: 14.0.5

Nightly does not panic.

Error output

thread 'rustc' panicked at 'range start index 2 out of range for slice of length 0', library/core/src/slice/index.rs:52:5

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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.63.0 (4b91a6ea7 2022-08-08) running on aarch64-apple-darwin

note: compiler flags: -C embed-bitcode=no -C split-debuginfo=unpacked -C debuginfo=2 -C incremental

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

query stack during panic:
#0 [typeck] type-checking `<impl at instant-xml/tests/all.rs:141:32: 141:39>::deserialize::<impl at instant-xml/tests/all.rs:141:32: 141:39>::visit_struct`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `instant-xml`

Backtrace

stack backtrace:
   0:        0x104fc3fe0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h188b7ef1c7993e78
   1:        0x105015a54 - core::fmt::write::he84a3004e7af3f34
   2:        0x104fb70c0 - std::io::Write::write_fmt::h9370b50affaab0be
   3:        0x104fc6c24 - std::panicking::default_hook::{{closure}}::hc074f8023cce83ca
   4:        0x104fc698c - std::panicking::default_hook::hef854b51b9b79ff2
   5:        0x10c434154 - rustc_driver[8d2050f8429f7bc4]::DEFAULT_HOOK::{closure#0}::{closure#0}
   6:        0x104fc71f8 - std::panicking::rust_panic_with_hook::h1e59e224d558a492
   7:        0x104fc7090 - std::panicking::begin_panic_handler::{{closure}}::he1a9d6ab32bfd8c6
   8:        0x104fc44bc - std::sys_common::backtrace::__rust_end_short_backtrace::he9b94791b02f48cd
   9:        0x104fc6de8 - _rust_begin_unwind
  10:        0x105043968 - core::panicking::panic_fmt::h9fec86f6a9c4146e
  11:        0x105017ee4 - core::slice::index::slice_start_index_len_fail_rt::h688e6b228e353181
  12:        0x10500a940 - core::ops::function::FnOnce::call_once::h7f4ad42cb14fdecd
  13:        0x105010ec0 - core::intrinsics::const_eval_select::hfb24506f4368c7d5
  14:        0x105043a18 - core::slice::index::slice_start_index_len_fail::hb490c535f9720713
  15:        0x10fefe174 - <rustc_middle[4fa9dd76776bb2aa]::ty::generics::Generics>::own_substs
  16:        0x10fd711dc - <rustc_infer[b8df2f762d2af832]::infer::error_reporting::need_type_info::FindInferSourceVisitor as rustc_hir[f8f7f977ec6e9d12]::intravisit::Visitor>::visit_expr
  17:        0x10fd70dec - <rustc_infer[b8df2f762d2af832]::infer::error_reporting::need_type_info::FindInferSourceVisitor as rustc_hir[f8f7f977ec6e9d12]::intravisit::Visitor>::visit_expr
  18:        0x10fd70f24 - <rustc_infer[b8df2f762d2af832]::infer::error_reporting::need_type_info::FindInferSourceVisitor as rustc_hir[f8f7f977ec6e9d12]::intravisit::Visitor>::visit_expr
  19:        0x10fd18f08 - <rustc_infer[b8df2f762d2af832]::infer::InferCtxt>::emit_inference_failure_err
  20:        0x10fc11f44 - <rustc_infer[b8df2f762d2af832]::infer::InferCtxt as rustc_trait_selection[3c6344c85e89bbc6]::traits::error_reporting::InferCtxtPrivExt>::maybe_report_ambiguity
  21:        0x10fc03184 - <rustc_infer[b8df2f762d2af832]::infer::InferCtxt as rustc_trait_selection[3c6344c85e89bbc6]::traits::error_reporting::InferCtxtExt>::report_fulfillment_errors
  22:        0x10e8ebdc4 - <rustc_typeck[dc6010940c7a2a65]::check::fn_ctxt::FnCtxt>::select_all_obligations_or_error
  23:        0x10ea075d4 - <rustc_infer[b8df2f762d2af832]::infer::InferCtxtBuilder>::enter::<&rustc_middle[4fa9dd76776bb2aa]::ty::context::TypeckResults, <rustc_typeck[dc6010940c7a2a65]::check::inherited::InheritedBuilder>::enter<rustc_typeck[dc6010940c7a2a65]::check::typeck_with_fallback<rustc_typeck[dc6010940c7a2a65]::check::typeck::{closure#0}>::{closure#1}, &rustc_middle[4fa9dd76776bb2aa]::ty::context::TypeckResults>::{closure#0}>
  24:        0x10e98b970 - rustc_typeck[dc6010940c7a2a65]::check::typeck
  25:        0x10f42f684 - <rustc_query_system[f18d9eae22d44560]::dep_graph::graph::DepGraph<rustc_middle[4fa9dd76776bb2aa]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[4fa9dd76776bb2aa]::ty::context::TyCtxt, rustc_span[143ffa354e326ede]::def_id::LocalDefId, &rustc_middle[4fa9dd76776bb2aa]::ty::context::TypeckResults>
  26:        0x10f1ee388 - rustc_query_system[f18d9eae22d44560]::query::plumbing::try_execute_query::<rustc_query_impl[d9716e6ec5023784]::plumbing::QueryCtxt, rustc_query_system[f18d9eae22d44560]::query::caches::DefaultCache<rustc_span[143ffa354e326ede]::def_id::LocalDefId, &rustc_middle[4fa9dd76776bb2aa]::ty::context::TypeckResults>>
  27:        0x10f2c30f8 - rustc_query_system[f18d9eae22d44560]::query::plumbing::get_query::<rustc_query_impl[d9716e6ec5023784]::queries::typeck, rustc_query_impl[d9716e6ec5023784]::plumbing::QueryCtxt>
  28:        0x10ea720fc - <rustc_middle[4fa9dd76776bb2aa]::hir::map::Map>::par_body_owners::<rustc_typeck[dc6010940c7a2a65]::check::typeck_item_bodies::{closure#0}>
  29:        0x10e98f9c0 - rustc_typeck[dc6010940c7a2a65]::check::typeck_item_bodies
  30:        0x10f4578e0 - <rustc_query_system[f18d9eae22d44560]::dep_graph::graph::DepGraph<rustc_middle[4fa9dd76776bb2aa]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[4fa9dd76776bb2aa]::ty::context::TyCtxt, (), ()>
  31:        0x10f22f5e0 - rustc_query_system[f18d9eae22d44560]::query::plumbing::try_execute_query::<rustc_query_impl[d9716e6ec5023784]::plumbing::QueryCtxt, rustc_query_system[f18d9eae22d44560]::query::caches::DefaultCache<(), ()>>
  32:        0x10f292e08 - rustc_query_system[f18d9eae22d44560]::query::plumbing::get_query::<rustc_query_impl[d9716e6ec5023784]::queries::typeck_item_bodies, rustc_query_impl[d9716e6ec5023784]::plumbing::QueryCtxt>
  33:        0x10ea71964 - <rustc_session[282d64e95cd3bf88]::session::Session>::time::<(), rustc_typeck[dc6010940c7a2a65]::check_crate::{closure#7}>
  34:        0x10e9fa368 - rustc_typeck[dc6010940c7a2a65]::check_crate
  35:        0x10c4bff24 - rustc_interface[db32075e2a9c594e]::passes::analysis
  36:        0x10f44fb48 - <rustc_query_system[f18d9eae22d44560]::dep_graph::graph::DepGraph<rustc_middle[4fa9dd76776bb2aa]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[4fa9dd76776bb2aa]::ty::context::TyCtxt, (), core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>
  37:        0x10f2245d0 - rustc_query_system[f18d9eae22d44560]::query::plumbing::try_execute_query::<rustc_query_impl[d9716e6ec5023784]::plumbing::QueryCtxt, rustc_query_system[f18d9eae22d44560]::query::caches::DefaultCache<(), core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>>
  38:        0x10f2c354c - rustc_query_system[f18d9eae22d44560]::query::plumbing::get_query::<rustc_query_impl[d9716e6ec5023784]::queries::analysis, rustc_query_impl[d9716e6ec5023784]::plumbing::QueryCtxt>
  39:        0x10c3f666c - <rustc_interface[db32075e2a9c594e]::passes::QueryContext>::enter::<rustc_driver[8d2050f8429f7bc4]::run_compiler::{closure#1}::{closure#2}::{closure#3}, core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>
  40:        0x10c3d97f0 - <rustc_interface[db32075e2a9c594e]::interface::Compiler>::enter::<rustc_driver[8d2050f8429f7bc4]::run_compiler::{closure#1}::{closure#2}, core[bae5e8ef542d20e5]::result::Result<core[bae5e8ef542d20e5]::option::Option<rustc_interface[db32075e2a9c594e]::queries::Linker>, rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>
  41:        0x10c3c5bb4 - rustc_span[143ffa354e326ede]::with_source_map::<core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>, rustc_interface[db32075e2a9c594e]::interface::create_compiler_and_run<core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>, rustc_driver[8d2050f8429f7bc4]::run_compiler::{closure#1}>::{closure#1}>
  42:        0x10c3d9fe8 - <scoped_tls[e8c526b3ddc66487]::ScopedKey<rustc_span[143ffa354e326ede]::SessionGlobals>>::set::<rustc_interface[db32075e2a9c594e]::interface::run_compiler<core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>, rustc_driver[8d2050f8429f7bc4]::run_compiler::{closure#1}>::{closure#0}, core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>
  43:        0x10c424b68 - std[ad4c17a2ddbcabe2]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[db32075e2a9c594e]::util::run_in_thread_pool_with_globals<rustc_interface[db32075e2a9c594e]::interface::run_compiler<core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>, rustc_driver[8d2050f8429f7bc4]::run_compiler::{closure#1}>::{closure#0}, core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>::{closure#0}, core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>
  44:        0x10c3f8ef8 - <<std[ad4c17a2ddbcabe2]::thread::Builder>::spawn_unchecked_<rustc_interface[db32075e2a9c594e]::util::run_in_thread_pool_with_globals<rustc_interface[db32075e2a9c594e]::interface::run_compiler<core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>, rustc_driver[8d2050f8429f7bc4]::run_compiler::{closure#1}>::{closure#0}, core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>::{closure#0}, core[bae5e8ef542d20e5]::result::Result<(), rustc_errors[3321b68084f70bb0]::ErrorGuaranteed>>::{closure#1} as core[bae5e8ef542d20e5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:        0x104fcfa5c - std::sys::unix::thread::Thread::new::thread_start::h7b2f9b83fb320a20
  46:        0x1bc56026c - __pthread_deallocate

[steffahn]

Regressed in #89862, fixed in 7e2733b (which contains #98610); probably a duplicate of #98598.