ICE: found unstable fingerprints on test `ui\associated-type-bounds\traits-assoc-type-macros.rs`

[petrochenkov]

I tried this code:

Test ui\associated-type-bounds\traits-assoc-type-macros.rs.

<code>

I expected to see this happen: test passes.

Instead, this happened:

stdout:
------------------------------------------

------------------------------------------
stderr:
------------------------------------------
thread 'rustc' panicked at 'found unstable fingerprints for proc_macro_decls_static(traits_assoc_type_macros[317d])', C:\msys64\home\we\rust\compiler\rustc_query_system\src\query\plumbing.rs:593:5
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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.52.0-dev running on x86_64-pc-windows-gnu

note: compiler flags: -Z threads=1 -Z ui-testing -Z deduplicate-diagnostics=no -Z emit-future-incompat-report -Z unstable-options -C prefer-dynamic -C rpath -C debuginfo=0 -C link-args=-fuse-ld=lld -C incremental

query stack during panic:
#0 [proc_macro_decls_static] looking up the derive registrar for a crate
#1 [analysis] running analysis passes on this crate
end of query stack
thread 'rustc' panicked at 'found unstable fingerprints for opt_def_kind(traits_assoc_type_macros[317d]::main)', C:\msys64\home\we\rust\compiler\rustc_query_system\src\query\plumbing.rs:593:5

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 1.52.0-dev running on x86_64-pc-windows-gnu

note: compiler flags: -Z threads=1 -Z ui-testing -Z deduplicate-diagnostics=no -Z emit-future-incompat-report -Z unstable-options -C prefer-dynamic -C rpath -C debuginfo=0 -C link-args=-fuse-ld=lld -C incremental

query stack during panic:
#0 [opt_def_kind] looking up definition kind of `main`
#1 [codegen_fn_attrs] computing codegen attributes of `main`
end of query stack

------------------------------------------

Meta

rustc --version --verbose:

rustc 1.52.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-pc-windows-gnu
release: 1.52.0-dev
LLVM version: 12.0.0

Backtrace

[Aaron1011]

@petrochenkov: I'm unable to reproduce this locally. Does this happen on the latest master?

[Aaron1011]

That test file isn't even a proc-macro crate, so I have no idea how proc_macro_decls_static could ever return anything other than None.

[petrochenkov]

I'll try to reproduce this outside of the test suite and with #83314.

[petrochenkov]

After clearing incremental cache for this test I cannot reproduce this either.

Although there probably was some legit reason behind the cache being corrupted, the reproduction is now lost so closing the issue.

[petrochenkov]

I'm seeing this error again after updating the compiler/library from upstream and rerunning the test suite.

[petrochenkov]

Another one from src/test/ui/async-await/issues/issue-64964.rs (also disappears after removing the incremental directories):

thread '<unnamed>' panicked at 'Error reading cached dep-graph: "invalid enum variant tag while decoding `DepKind`, expected 0..249"', compiler/rustc_incremental/src/persist/load.rs:186:22
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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.53.0-dev running on x86_64-pc-windows-gnu

note: compiler flags: -Z threads=1 -Z ui-testing -Z deduplicate-diagnostics=no -Z emit-future-incompat-report -Z unstable-options -Z query-dep-graph -C prefer-dynamic -C rpath -C debuginfo=0 -C link-args=-fuse-ld=lld -C incremental

query stack during panic:
end of query stack
warning: could not decode incremental cache: Any

warning: 1 warning emitted

[Aaron1011]

The second issue seems like an issue with the incremental cache not getting invalidated when the compiler version is changed. Normally, that happens because the nightly compiler date changes, but I think it might not be happening with a locally built compiler (since the version suffix is always -dev). I don't think it has anything to do with the original issue.

[petrochenkov]

Status update: I haven't seen these errors recently.