Thread 'rustc' panicked at 'Missing span for DefIndex(1193)'

[jflatow]

I can't provide any details about the project I'm working on, but the compiler asked me to report, so here I am.

Code

Something to do with serde / serde_json

Meta

rustc --version --verbose:

rustc 1.51.0-nightly (a4cbb44ae 2021-01-20)
binary: rustc
commit-hash: a4cbb44ae2c80545db957763b502dc7f6ea22085
commit-date: 2021-01-20
host: x86_64-apple-darwin
release: 1.51.0-nightly
LLVM version: 11.0.1

Error output

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 1.51.0-nightly (a4cbb44ae 2021-01-20) running on x86_64-apple-darwin

note: compiler flags: -Z macro-backtrace -C embed-bitcode=no -C debuginfo=2 -C incremental

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

Backtrace

thread 'rustc' panicked at 'Missing span for DefIndex(1193)', compiler/rustc_metadata/src/rmeta/decoder.rs:748:32
stack backtrace:
   0: _rust_begin_unwind
   1: std::panicking::begin_panic_fmt
   2: rustc_metadata::rmeta::decoder::<impl rustc_metadata::creader::CrateMetadataRef>::get_span::{{closure}}
   3: rustc_metadata::rmeta::decoder::<impl rustc_metadata::creader::CrateMetadataRef>::get_span
   4: rustc_metadata::rmeta::decoder::cstore_impl::provide_extern::def_span
   5: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::def_span>::compute
   6: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
   7: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
   8: rustc_data_structures::stack::ensure_sufficient_stack
   9: rustc_query_system::query::plumbing::force_query_with_job
  10: rustc_query_system::query::plumbing::get_query_impl
  11: <rustc_typeck::structured_errors::wrong_number_of_generic_args::WrongNumberOfGenericArgs as rustc_typeck::structured_errors::StructuredDiagnostic>::diagnostic_common
  12: rustc_typeck::structured_errors::StructuredDiagnostic::diagnostic
  13: rustc_typeck::astconv::generics::<impl dyn rustc_typeck::astconv::AstConv>::check_generic_arg_count::{{closure}}
  14: rustc_typeck::astconv::generics::<impl dyn rustc_typeck::astconv::AstConv>::check_generic_arg_count
  15: <dyn rustc_typeck::astconv::AstConv>::create_substs_for_ast_path
  16: <dyn rustc_typeck::astconv::AstConv>::create_substs_for_ast_trait_ref
  17: <dyn rustc_typeck::astconv::AstConv>::instantiate_poly_trait_ref_inner
  18: rustc_typeck::collect::gather_explicit_predicates_of
  19: rustc_typeck::collect::explicit_predicates_of
  20: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::explicit_predicates_of>::compute
  21: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  22: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  23: rustc_data_structures::stack::ensure_sufficient_stack
  24: rustc_query_system::query::plumbing::force_query_with_job
  25: rustc_query_system::query::plumbing::force_query_impl
  26: rustc_middle::dep_graph::dep_node::dep_kind::explicit_predicates_of::force_from_dep_node
  27: rustc_query_system::dep_graph::graph::DepGraph<K>::try_mark_previous_green
  28: rustc_query_system::dep_graph::graph::DepGraph<K>::try_mark_previous_green
  29: rustc_query_system::dep_graph::graph::DepGraph<K>::try_mark_green_and_read
  30: rustc_query_system::query::plumbing::ensure_query_impl
  31: <rustc_typeck::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
  32: rustc_middle::hir::map::Map::visit_item_likes_in_module
  33: rustc_typeck::collect::collect_mod_item_types
  34: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_mod_item_types>::compute
  35: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  36: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  37: rustc_data_structures::stack::ensure_sufficient_stack
  38: rustc_query_system::query::plumbing::force_query_with_job
  39: rustc_query_system::query::plumbing::get_query_impl
  40: rustc_query_system::query::plumbing::ensure_query_impl
  41: rustc_typeck::check_crate
  42: rustc_interface::passes::analysis
  43: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
  44: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  45: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  46: rustc_data_structures::stack::ensure_sufficient_stack
  47: rustc_query_system::query::plumbing::force_query_with_job
  48: rustc_query_system::query::plumbing::get_query_impl
  49: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  50: rustc_span::with_source_map
  51: rustc_interface::interface::create_compiler_and_run
  52: rustc_span::with_session_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[tmiasko]

Is the error reproducible? Does it reproduce on the most recent nightly?