ICE: failed to lookup `SourceFile` in new context

[48cf]

Code

I am not able to narrow down the error, sadly. The project is simply too big for me to figure out what's going on, but if it helps the exact commit on which this error happens is Andy-Python-Programmer/aero@023649f. For some additional information please look at Andy-Python-Programmer/aero#20, it explains the issue more in-depth and I also went ahead and tried to narrow it down to specific rustc commits (2nd reply in the issue).

Meta

rustc --version --verbose:

rustc 1.59.0-nightly (e100ec5bc 2021-12-21)
binary: rustc
commit-hash: e100ec5bc7cd768ec17d75448b29c9ab4a39272b
commit-date: 2021-12-21
host: x86_64-unknown-linux-gnu
release: 1.59.0-nightly
LLVM version: 13.0.0

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 1.59.0-nightly (e100ec5bc 2021-12-21) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z unstable-options -C embed-bitcode=no -C debuginfo=2 -C incremental -C force-frame-pointers=yes --crate-type bin

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

query stack during panic:
#0 [type_of] computing type of `fs::cache::CacheIndex::unused`
#1 [check_private_in_public] checking for private elements in public interfaces
#2 [analysis] running analysis passes on this crate
end of query stack

Backtrace

thread 'rustc' panicked at 'failed to lookup `SourceFile` in new context', compiler/rustc_query_impl/src/on_disk_cache.rs:500:22
stack backtrace:
   0: rust_begin_unwind
             at /rustc/e100ec5bc7cd768ec17d75448b29c9ab4a39272b/library/std/src/panicking.rs:498:5
   1: core::panicking::panic_fmt
             at /rustc/e100ec5bc7cd768ec17d75448b29c9ab4a39272b/library/core/src/panicking.rs:107:14
   2: core::panicking::panic_display
             at /rustc/e100ec5bc7cd768ec17d75448b29c9ab4a39272b/library/core/src/panicking.rs:63:5
   3: core::option::expect_failed
             at /rustc/e100ec5bc7cd768ec17d75448b29c9ab4a39272b/library/core/src/option.rs:1819:5
   4: <rustc_span::span_encoding::Span as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
   5: <rustc_middle::ty::VariantDef as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
   6: <rustc_query_impl::on_disk_cache::CacheDecoder as rustc_serialize::serialize::Decoder>::read_seq::<alloc::vec::Vec<rustc_middle::ty::VariantDef>, <alloc::vec::Vec<rustc_middle::ty::VariantDef> as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode::{closure#0}>
   7: <rustc_middle::ty::adt::AdtDef as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
   8: <rustc_middle::ty::sty::TyKind as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
   9: <&rustc_middle::ty::TyS as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
  10: <smallvec::SmallVec<[rustc_middle::ty::subst::GenericArg; 8]> as core::iter::traits::collect::Extend<rustc_middle::ty::subst::GenericArg>>::extend::<core::iter::adapters::ResultShunt<core::iter::adapters::map::Map<core::ops::range::Range<usize>, <&rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg> as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode::{closure#0}>, alloc::string::String>>
  11: <core::result::Result<rustc_middle::ty::subst::GenericArg, alloc::string::String> as rustc_middle::ty::context::InternIteratorElement<rustc_middle::ty::subst::GenericArg, &rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg>>>::intern_with::<core::iter::adapters::map::Map<core::ops::range::Range<usize>, <&rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg> as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode::{closure#0}>, <rustc_middle::ty::context::TyCtxt>::mk_substs<core::iter::adapters::map::Map<core::ops::range::Range<usize>, <&rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg> as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode::{closure#0}>>::{closure#0}>
  12: <rustc_middle::ty::sty::TyKind as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
  13: <&rustc_middle::ty::TyS as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
  14: <core::result::Result<rustc_middle::ty::subst::GenericArg, alloc::string::String> as rustc_middle::ty::context::InternIteratorElement<rustc_middle::ty::subst::GenericArg, &rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg>>>::intern_with::<core::iter::adapters::map::Map<core::ops::range::Range<usize>, <&rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg> as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode::{closure#0}>, <rustc_middle::ty::context::TyCtxt>::mk_substs<core::iter::adapters::map::Map<core::ops::range::Range<usize>, <&rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg> as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode::{closure#0}>>::{closure#0}>
  15: <rustc_middle::ty::sty::TyKind as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
  16: <&rustc_middle::ty::TyS as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
  17: <&rustc_middle::ty::TyS as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode
  18: <rustc_query_impl::on_disk_cache::CacheDecoder as rustc_serialize::serialize::Decoder>::read_map::<std::collections::hash::map::HashMap<rustc_hir::hir_id::ItemLocalId, &rustc_middle::ty::TyS, core::hash::BuildHasherDefault<rustc_hash::FxHasher>>, <std::collections::hash::map::HashMap<rustc_hir::hir_id::ItemLocalId, &rustc_middle::ty::TyS, core::hash::BuildHasherDefault<rustc_hash::FxHasher>> as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode::{closure#0}>
  19: <rustc_middle::ty::context::TypeckResults as rustc_serialize::serialize::Decodable<rustc_query_impl::on_disk_cache::CacheDecoder>>::decode::{closure#0}
  20: <rustc_query_impl::on_disk_cache::OnDiskCache>::try_load_query_result::<&rustc_middle::ty::context::TypeckResults>
  21: rustc_query_system::query::plumbing::try_load_from_disk_and_cache_in_memory::<rustc_query_impl::plumbing::QueryCtxt, rustc_span::def_id::LocalDefId, &rustc_middle::ty::context::TypeckResults>
  22: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalDefId, &rustc_middle::ty::context::TypeckResults>>
  23: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
  24: <rustc_middle::ty::context::TyCtxt>::typeck_body
  25: rustc_hir::intravisit::walk_impl_item::<rustc_passes::dead::MarkSymbolVisitor>
  26: rustc_passes::dead::check_crate
  27: <core::panic::unwind_safe::AssertUnwindSafe<rustc_interface::passes::analysis::{closure#5}::{closure#0}::{closure#1}> as core::ops::function::FnOnce<()>>::call_once
  28: <core::panic::unwind_safe::AssertUnwindSafe<rustc_interface::passes::analysis::{closure#5}::{closure#0}> as core::ops::function::FnOnce<()>>::call_once
  29: <rustc_session::session::Session>::time::<(), rustc_interface::passes::analysis::{closure#5}>
  30: rustc_interface::passes::analysis
  31: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, (), core::result::Result<(), rustc_errors::ErrorReported>>
  32: rustc_data_structures::stack::ensure_sufficient_stack::<(core::result::Result<(), rustc_errors::ErrorReported>, rustc_query_system::dep_graph::graph::DepNodeIndex), rustc_query_system::query::plumbing::execute_job<rustc_query_impl::plumbing::QueryCtxt, (), core::result::Result<(), rustc_errors::ErrorReported>>::{closure#3}>
  33: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorReported>>>
  34: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  35: <rustc_interface::passes::QueryContext>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorReported>>
  36: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
  37: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
  38: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[48cf]

I think #92175 should fix it

[ehuss]

Thanks for the report!

This is an issue with incremental compilation. You can delete the incremental directory, or use CARGO_INCREMENTAL=0 to disable incremental compilation.

Closing as a duplicate of #92163.