The error has been occurring sporadically for like a week or two with recent nightly versions. Unfortunately I don't have more details, please let me know if I can help somehow.
Error output
thread 'rustc' panicked at /rustc/3e674b06b5c74adea662bd0b0b06450757994b16/compiler/rustc_query_system/src/dep_graph/serialized.rs:284:21:
Error: A dep graph node (mir_drops_elaborated_and_const_checked) does not have an unique index. Running a clean build on a nightly compiler with `-Z incremental-verify-ich` can help narrow down the issue for reporting. A clean build may also work around the issue.
DepNode: DepKind { variant: 55 }(66f52541bc7a3a54-9342199b53a1abb9)
stack backtrace:
0: 0x7f110d0d9ee5 - std::backtrace::Backtrace::create::hfa425f8c6118c291
1: 0x7f110b558655 - std::backtrace::Backtrace::force_capture::hc89ba712c3edf9d4
2: 0x7f110a59b841 - std[dddea0bc0c38a8db]::panicking::update_hook::<alloc[ad07e7cbb7f1de4e]::boxed::Box<rustc_driver_impl[40f87d5870cfacca]::install_ice_hook::{closure#1}>>::{closure#0}
3: 0x7f110b572583 - std::panicking::rust_panic_with_hook::hedd3f60f85824998
4: 0x7f110b57227a - std::panicking::begin_panic_handler::{{closure}}::hf9de1d740cfa85c9
5: 0x7f110b56e779 - std::sys::backtrace::__rust_end_short_backtrace::h60f7d5e7789cd81b
6: 0x7f110b571f3d - __rustc[6241699db995e819]::rust_begin_unwind
7: 0x7f1107e89ee0 - core::panicking::panic_fmt::h4e2563c759f41a6b
8: 0x7f110cd6347f - rustc_incremental[e2943fc0bf579b13]::persist::load::setup_dep_graph
9: 0x7f110cd1b204 - rustc_interface[3a0a2c43e50c5194]::interface::run_compiler::<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}
10: 0x7f110a5af124 - <rayon_core[450d1f61637cc29a]::job::StackJob<rayon_core[450d1f61637cc29a]::latch::LatchRef<rayon_core[450d1f61637cc29a]::latch::LockLatch>, <rayon_core[450d1f61637cc29a]::registry::Registry>::in_worker_cold<<rayon_core[450d1f61637cc29a]::thread_pool::ThreadPool>::install<rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_pool_with_globals<rustc_interface[3a0a2c43e50c5194]::interface::run_compiler<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}::{closure#0}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> as rayon_core[450d1f61637cc29a]::job::Job>::execute
11: 0x7f110a04404e - <rayon_core[450d1f61637cc29a]::registry::WorkerThread>::wait_until_cold
12: 0x7f110a0419d1 - <rayon_core[450d1f61637cc29a]::registry::ThreadBuilder>::run
13: 0x7f110a59175d - std[dddea0bc0c38a8db]::sys::backtrace::__rust_begin_short_backtrace::<<rayon_core[450d1f61637cc29a]::ThreadPoolBuilder>::build_scoped<rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_pool_with_globals<rustc_interface[3a0a2c43e50c5194]::interface::run_compiler<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_pool_with_globals<rustc_interface[3a0a2c43e50c5194]::interface::run_compiler<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
14: 0x7f110a59ffb2 - <<std[dddea0bc0c38a8db]::thread::Builder>::spawn_unchecked_<<rayon_core[450d1f61637cc29a]::ThreadPoolBuilder>::build_scoped<rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_pool_with_globals<rustc_interface[3a0a2c43e50c5194]::interface::run_compiler<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_pool_with_globals<rustc_interface[3a0a2c43e50c5194]::interface::run_compiler<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core[a1eebbb7364c739]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
15: 0x7f110ccc66fd - std::sys::pal::unix::thread::Thread::new::thread_start::h337190b46df16ff4
16: 0x7f1106899546 - start_thread
17: 0x7f110691d94c - __GI___clone3
18: 0x0 - <unknown>
rustc version: 1.89.0-nightly (3e674b06b 2025-05-23)
platform: x86_64-unknown-linux-gnu
Work-around
You can disable incremental compilation to avoid this issue.
There are multiple ways to do it, for example:
Add this to $WORKSPACE/.cargo/config.toml:
[build]
incremental = false
or set the CARGO_INCREMENTAL environment variable:
export CARGO_INCREMENTAL=0
The error has been occurring sporadically for like a week or two with recent nightly versions. Unfortunately I don't have more details, please let me know if I can help somehow.
Error output
Work-around
You can disable incremental compilation to avoid this issue.
There are multiple ways to do it, for example:
Add this to
$WORKSPACE/.cargo/config.toml:or set the
CARGO_INCREMENTALenvironment variable:export CARGO_INCREMENTAL=0