thread 'rustc' panicked at compiler\rustc_monomorphize\src\collector.rs:295:51

Code

git clone https://github.com/rustp2p/rustp2p/tree/4cd70aad375e27126d5d33c52c211b695550499d
cargo run --example node_kcp_stream -- --peer udp://x.x.x.x:8080 --group-code rust-p2p --id 1024

Meta

rustc --version --verbose:

rustc 1.86.0 (05f9846f8 2025-03-31)
binary: rustc
commit-hash: 05f9846f893b09a1be1fc8560e33fc3c815cfecb
commit-date: 2025-03-31
host: x86_64-pc-windows-msvc
release: 1.86.0
LLVM version: 19.1.7

Error output

thread 'rustc' panicked at compiler\rustc_monomorphize\src\collector.rs:295:51:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x7ffb3ab717b1 - std::backtrace_rs::backtrace::win64::trace
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1:     0x7ffb3ab717b1 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ffb3ab717b1 - std::sys::backtrace::_print_fmt
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\sys\backtrace.rs:66
   3:     0x7ffb3ab717b1 - std::sys::backtrace::impl$0::print::impl$0::fmt
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\sys\backtrace.rs:39
   4:     0x7ffb3aba52ba - core::fmt::rt::Argument::fmt
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\core\src\fmt\rt.rs:177
   5:     0x7ffb3aba52ba - core::fmt::write
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\core\src\fmt\mod.rs:1449
   6:     0x7ffb3ab67537 - std::io::Write::write_fmt<std::sys::pal::windows::stdio::Stderr>
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\io\mod.rs:1890
   7:     0x7ffb3ab715f5 - std::sys::backtrace::BacktraceLock::print
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\sys\backtrace.rs:42
   8:     0x7ffb3ab74520 - std::panicking::default_hook::closure$0
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\panicking.rs:298
   9:     0x7ffb3ab74311 - std::panicking::default_hook
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\panicking.rs:325
  10:     0x7ffb3c22764f - core[379ed1e85498c8da]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[954f94a5540fbc1c]::Level, &str), usize), <((rustc_lint_defs[954f94a5540fbc1c]::Level, &str), usize) as core[379ed1e85498c8da]::cmp::PartialOrd>::lt>
  11:     0x7ffb3ab751ae - alloc::boxed::impl$30::call
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\alloc\src\boxed.rs:1990
  12:     0x7ffb3ab751ae - std::panicking::rust_panic_with_hook
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\panicking.rs:839
  13:     0x7ffb3ab74ed2 - std::panicking::begin_panic_handler::closure$0
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\panicking.rs:697
  14:     0x7ffb3ab7231f - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$>
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\sys\backtrace.rs:168
  15:     0x7ffb3ab74b0e - std::panicking::begin_panic_handler
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\panicking.rs:695
  16:     0x7ffb3db046f1 - core::panicking::panic_fmt
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\core\src\panicking.rs:75
  17:     0x7ffb3db047ad - core::panicking::panic
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\core\src\panicking.rs:145
  18:     0x7ffb3db0466e - core::option::unwrap_failed
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\core\src\option.rs:2015
  19:     0x7ffb3af6dcb9 - rustc_monomorphize[90fde467f2845068]::mono_checks::check_mono_item
  20:     0x7ffb3af6d848 - rustc_monomorphize[90fde467f2845068]::mono_checks::check_mono_item
  21:     0x7ffb3af6321c - rustc_monomorphize[90fde467f2845068]::mono_checks::check_mono_item
  22:     0x7ffb3a4b9da5 - RINvNtNtNtNtCs4M45Py2ANNS_4core5slice4sort6stable9quicksort9quicksortNtNtNtCs2vqUEYxsi4E_12rustc_middle3mir4mono11CodegenUnitNCINvMNtCsdPcZrWPtBQZ_5alloc5sliceSB15_7sort_byNCNvNtCscrMQbMLbhAi_18rustc_monomorphize12partitioning19merge_codegen_unitss4_0E0EB2
  23:     0x7ffb3af6ee59 - rustc_monomorphize[90fde467f2845068]::partitioning::collect_and_partition_mono_items
  24:     0x7ffb3a7776f7 - <alloc[a10a1d58def73cb3]::sync::Arc<rustc_session[19a3b74f3cfc0353]::cstore::CrateSource>>::drop_slow
  25:     0x7ffb3a75ae4d - <alloc[a10a1d58def73cb3]::sync::Arc<rustc_session[19a3b74f3cfc0353]::cstore::CrateSource>>::drop_slow
  26:     0x7ffb3a68ef70 - RINvNtNtCs1bonBNpMvFl_18rustc_query_system5query8plumbing17try_execute_queryINtCs5uFTMav0Vyp_16rustc_query_impl13DynamicConfigINtNtB4_6caches11SingleCacheINtNtNtCs2vqUEYxsi4E_12rustc_middle5query5erase6ErasedAhj28_EEKb0_KB3t_KB3t_ENtNtB1f_8plumbing9QueryCt
  27:     0x7ffb3d0d6791 - <rustc_span[feb426b5f536fd7b]::def_id::DefIndex as rustc_query_impl[40004147c2ba326b]::profiling_support::SpecIntoSelfProfilingString>::spec_to_self_profile_string
  28:     0x7ffb3b9eea3b - rustc_codegen_ssa[127dad73d42d1fb2]::back::symbol_export::exported_symbols_provider_local
  29:     0x7ffb3a77491a - <alloc[a10a1d58def73cb3]::sync::Arc<rustc_session[19a3b74f3cfc0353]::cstore::CrateSource>>::drop_slow
  30:     0x7ffb3a74f1dd - <alloc[a10a1d58def73cb3]::sync::Arc<rustc_session[19a3b74f3cfc0353]::cstore::CrateSource>>::drop_slow
  31:     0x7ffb3a6f8527 - RINvNtNtCs1bonBNpMvFl_18rustc_query_system5query8plumbing17try_execute_queryINtCs5uFTMav0Vyp_16rustc_query_impl13DynamicConfigINtNtCsdmqHcUI6doO_21rustc_data_structures9vec_cache8VecCacheNtNtCslRMtD7Kp4gh_10rustc_span6def_id8CrateNumINtNtNtCs2vqUEYxsi4E_12
  32:     0x7ffb3a79e6c0 - rustc_query_impl[40004147c2ba326b]::query_system
  33:     0x7ffb3bc6eeee - <rustc_metadata[8812c7b17da9c624]::rmeta::encoder::EncodeContext as rustc_span[feb426b5f536fd7b]::SpanEncoder>::encode_symbol
  34:     0x7ffb3a91982d - rustc_metadata[8812c7b17da9c624]::rmeta::encoder::encode_metadata
  35:     0x7ffb3a92255a - rustc_metadata[8812c7b17da9c624]::fs::encode_and_write_metadata
  36:     0x7ffb377ed57f - <rustc_interface[8ba4dc793610d11]::queries::Linker>::codegen_and_build_linker
  37:     0x7ffb377afc67 - RINvNtNtCs95AQCFfcpgw_3std3sys9backtrace28___rust_begin_short_backtraceNCNCNCINvMNtB6_6threadNtB1h_7Builder16spawn_unchecked_INtNtCsdPcZrWPtBQZ_5alloc5boxed3BoxDINtNtNtCs4M45Py2ANNS_4core3ops8function6FnOnceuEp6OutputuNtNtB2G_6marker4SendEL_EuEs_000uECs42d
  38:     0x7ffb377a7fff - RINvNtNtCs95AQCFfcpgw_3std3sys9backtrace28___rust_begin_short_backtraceNCNCNCINvMNtB6_6threadNtB1h_7Builder16spawn_unchecked_INtNtCsdPcZrWPtBQZ_5alloc5boxed3BoxDINtNtNtCs4M45Py2ANNS_4core3ops8function6FnOnceuEp6OutputuNtNtB2G_6marker4SendEL_EuEs_000uECs42d
  39:     0x7ffb377a0ce9 - RINvNtNtCs95AQCFfcpgw_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCsKsn22XSOmP_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCs42dsZK7oXeC_17rustc_driver_im
  40:     0x7ffb377b49c3 - RINvNtNtCs95AQCFfcpgw_3std3sys9backtrace28___rust_begin_short_backtraceNCNCNCINvMNtB6_6threadNtB1h_7Builder16spawn_unchecked_INtNtCsdPcZrWPtBQZ_5alloc5boxed3BoxDINtNtNtCs4M45Py2ANNS_4core3ops8function6FnOnceuEp6OutputuNtNtB2G_6marker4SendEL_EuEs_000uECs42d
  41:     0x7ffb3ab8656d - alloc::boxed::impl$28::call_once
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\alloc\src\boxed.rs:1976
  42:     0x7ffb3ab8656d - alloc::boxed::impl$28::call_once
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\alloc\src\boxed.rs:1976
  43:     0x7ffb3ab8656d - std::sys::pal::windows::thread::impl$0::new::thread_start
                               at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library\std\src\sys\pal\windows\thread.rs:56
  44:     0x7ffbbfdd7374 - BaseThreadInitThunk
  45:     0x7ffbc181cc91 - RtlUserThreadStart

error: 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 1.86.0 (05f9846f8 2025-03-31) running on x86_64-pc-windows-msvc

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

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

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
#1 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
error: could not compile `rustp2p` (lib)

Caused by:
  process didn't exit successfully: `C:\Users\DY2024\.rustup\toolchains\stable-x86_64-pc-windows-msvc\bin\rustc.exe --crate-name rustp2p --edition=2021 src\lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=119 --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg "feature=\"aes-gcm\"" --cfg "feature=\"default\"" --cfg "feature=\"kcp\"" --cfg "feature=\"ring\"" --cfg "feature=\"use-kcp\"" --check-cfg cfg(docsrs,test) --check-cfg "cfg(feature, values(\"aes-gcm\", \"chacha20-poly1305\", \"default\", \"kcp\", \"ring\", \"use-kcp\"))" -C metadata=17e731cf31f6036d -C extra-filename=-afdff4327a0b8e73 --out-dir D:\rust-workspace\rustp2p\target\debug\deps -C incremental=D:\rust-workspace\rustp2p\target\debug\incremental -L dependency=D:\rust-workspace\rustp2p\target\debug\deps --extern async_shutdown=D:\rust-workspace\rustp2p\target\debug\deps\libasync_shutdown-333f7bb6ac1b04b2.rmeta --extern async_trait=D:\rust-workspace\rustp2p\target\debug\deps\async_trait-e7e703dee0817039.dll --extern bytes=D:\rust-workspace\rustp2p\target\debug\deps\libbytes-d18dcb52e317328a.rmeta --extern crossbeam_queue=D:\rust-workspace\rustp2p\target\debug\deps\libcrossbeam_queue-fad21306d5bb70e8.rmeta --extern crossbeam_utils=D:\rust-workspace\rustp2p\target\debug\deps\libcrossbeam_utils-05ebb9128f5cd03c.rmeta --extern dashmap=D:\rust-workspace\rustp2p\target\debug\deps\libdashmap-59fb4c6b06ec3d1a.rmeta --extern dns_parser=D:\rust-workspace\rustp2p\target\debug\deps\libdns_parser-d3993e19aaabc81a.rmeta --extern flume=D:\rust-workspace\rustp2p\target\debug\deps\libflume-9beb41dd9944ff8b.rmeta --extern futures=D:\rust-workspace\rustp2p\target\debug\deps\libfutures-573ed7291d1bf7cc.rmeta --extern kcp=D:\rust-workspace\rustp2p\target\debug\deps\libkcp-26049e7d94fd9b5e.rmeta --extern log=D:\rust-workspace\rustp2p\target\debug\deps\liblog-0cedae3a88086422.rmeta --extern parking_lot=D:\rust-workspace\rustp2p\target\debug\deps\libparking_lot-aba126dacead5cb4.rmeta --extern rand=D:\rust-workspace\rustp2p\target\debug\deps\librand-97d0e1b09972c6f6.rmeta --extern ring=D:\rust-workspace\rustp2p\target\debug\deps\libring-598abcdea4cdd1ce.rmeta --extern rmp_serde=D:\rust-workspace\rustp2p\target\debug\deps\librmp_serde-ed0f39c9f2890192.rmeta --extern rust_p2p_core=D:\rust-workspace\rustp2p\target\debug\deps\librust_p2p_core-89d578ccea9d033e.rmeta --extern sha2=D:\rust-workspace\rustp2p\target\debug\deps\libsha2-b9d2341a53c76718.rmeta --extern thiserror=D:\rust-workspace\rustp2p\target\debug\deps\libthiserror-6e0a1b328fe61b83.rmeta --extern tokio=D:\rust-workspace\rustp2p\target\debug\deps\libtokio-f77f08d23dc27e37.rmeta --extern tokio_util=D:\rust-workspace\rustp2p\target\debug\deps\libtokio_util-0a0d945d8a0291b5.rmeta -L native=C:\Users\DY2024\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\windows_x86_64_msvc-0.52.6\lib -L native=D:\rust-workspace\rustp2p\target\debug\build\ring-d96fa81d6c6837f7\out` (exit code: 101)

<backtrace>

Start by reproducing the panic with the provided rustp2p commit and cargo run command on rustc 1.86.0, then inspect compiler/rustc_monomorphize/src/collector.rs:295:51 and the collect_and_partition_mono_items query. Done means the supplied crate no longer triggers the Option::unwrap panic, with a regression test covering the case if the compiler test suite has an appropriate entry point.