[INFO] fetching crate stewart 0.9.1... [INFO] checking stewart-0.9.1 against try#66388cc165a6c4ac98c074dc9f0281ff23528c55 for pr-150727 [INFO] extracting crate stewart 0.9.1 into /workspace/builds/worker-3-tc2/source [INFO] started tweaking crates.io crate stewart 0.9.1 [INFO] finished tweaking crates.io crate stewart 0.9.1 [INFO] tweaked toml for crates.io crate stewart 0.9.1 written to /workspace/builds/worker-3-tc2/source/Cargo.toml [INFO] validating manifest of crates.io crate stewart 0.9.1 on toolchain 66388cc165a6c4ac98c074dc9f0281ff23528c55 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+66388cc165a6c4ac98c074dc9f0281ff23528c55" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate crates.io crate stewart 0.9.1 already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+66388cc165a6c4ac98c074dc9f0281ff23528c55" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+66388cc165a6c4ac98c074dc9f0281ff23528c55" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] c82dfcbb85037c64b8da42525b24c5c7511a9d80e4911e911531aac0ffd5c796 [INFO] running `Command { std: "docker" "start" "-a" "c82dfcbb85037c64b8da42525b24c5c7511a9d80e4911e911531aac0ffd5c796", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "c82dfcbb85037c64b8da42525b24c5c7511a9d80e4911e911531aac0ffd5c796", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c82dfcbb85037c64b8da42525b24c5c7511a9d80e4911e911531aac0ffd5c796", kill_on_drop: false }` [INFO] [stdout] c82dfcbb85037c64b8da42525b24c5c7511a9d80e4911e911531aac0ffd5c796 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+66388cc165a6c4ac98c074dc9f0281ff23528c55" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 3936b65d3189890f079505267d079b0ff9d5e1ff7772d78c96b2aef7ebc26f5c [INFO] running `Command { std: "docker" "start" "-a" "3936b65d3189890f079505267d079b0ff9d5e1ff7772d78c96b2aef7ebc26f5c", kill_on_drop: false }` [INFO] [stderr] Compiling quote v1.0.31 [INFO] [stderr] Checking tracing-core v0.1.31 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Compiling libc v0.2.147 [INFO] [stderr] Checking regex-syntax v0.7.4 [INFO] [stderr] Checking pin-project-lite v0.2.10 [INFO] [stderr] Checking regex-syntax v0.6.29 [INFO] [stderr] Checking overload v0.1.1 [INFO] [stderr] Compiling anyhow v1.0.72 [INFO] [stderr] Checking log v0.4.19 [INFO] [stderr] Compiling thiserror v1.0.43 [INFO] [stderr] Checking thread_local v1.1.7 [INFO] [stderr] Checking smallvec v1.11.0 [INFO] [stderr] Checking thunderdome v0.6.1 [INFO] [stderr] Checking sharded-slab v0.1.4 [INFO] [stderr] Checking nu-ansi-term v0.46.0 [INFO] [stderr] Checking tracing-log v0.1.3 [INFO] [stderr] Compiling syn v2.0.26 [INFO] [stderr] Checking getrandom v0.2.10 [INFO] [stderr] Checking uuid v1.4.0 [INFO] [stderr] Checking regex-automata v0.3.3 [INFO] [stderr] Checking regex-automata v0.1.10 [INFO] [stderr] Checking regex v1.9.1 [INFO] [stderr] Checking matchers v0.1.0 [INFO] [stderr] Compiling tracing-test-macro v0.2.4 [INFO] [stderr] Compiling tracing-attributes v0.1.26 [INFO] [stderr] Compiling thiserror-impl v1.0.43 [INFO] [stderr] Checking tracing v0.1.37 [INFO] [stderr] Checking tracing-subscriber v0.3.17 [INFO] [stderr] Checking stewart v0.9.1 (/opt/rustwide/workdir) [INFO] [stdout] warning: value assigned to `source` is never read [INFO] [stdout] --> src/mailbox.rs:111:5 [INFO] [stdout] | [INFO] [stdout] 111 | source: Error, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `source` is never read [INFO] [stdout] --> src/world.rs:159:5 [INFO] [stdout] | [INFO] [stdout] 159 | source: Error, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking tracing-test v0.2.4 [INFO] [stderr] [INFO] [stderr] thread 'rustc' (463) panicked at /rustc-dev/66388cc165a6c4ac98c074dc9f0281ff23528c55/compiler/rustc_ast/src/attr/mod.rs:302:36: [INFO] [stderr] attribute is missing tokens: Attribute { kind: Normal(NormalAttr { item: AttrItem { unsafety: Default, path: Path { span: tests/world.rs:12:1: 12:8 (#27), segments: [PathSegment { ident: #27, id: NodeId(4294967040), args: None }], tokens: None }, args: Unparsed(Empty), tokens: None }, tokens: None }), id: AttrId(15), style: Outer, span: tests/world.rs:12:1: 12:8 (#27) } [INFO] [stderr] stack backtrace: [INFO] [stderr] 0: 0x7727f202bfa3 - <::print::DisplayBacktrace as core[75ca2badb63c4514]::fmt::Display>::fmt [INFO] [stderr] 1: 0x7727f260fb48 - core[75ca2badb63c4514]::fmt::write [INFO] [stderr] 2: 0x7727f2042226 - ::write_fmt [INFO] [stderr] 3: 0x7727f2001b98 - std[7d609349af90bec6]::panicking::default_hook::{closure#0} [INFO] [stderr] 4: 0x7727f201f833 - std[7d609349af90bec6]::panicking::default_hook [INFO] [stderr] 5: 0x7727f100236a - std[7d609349af90bec6]::panicking::update_hook::>::{closure#0} [INFO] [stderr] 6: 0x7727f201fb12 - std[7d609349af90bec6]::panicking::panic_with_hook [INFO] [stderr] 7: 0x7727f2001c58 - std[7d609349af90bec6]::panicking::panic_handler::{closure#0} [INFO] [stderr] 8: 0x7727f1ff89a9 - std[7d609349af90bec6]::sys::backtrace::__rust_end_short_backtrace:: [INFO] [stderr] 9: 0x7727f200372d - __rustc[69841a6cbc58d81d]::rust_begin_unwind [INFO] [stderr] 10: 0x7727eec38f9c - core[75ca2badb63c4514]::panicking::panic_fmt [INFO] [stderr] 11: 0x7727f33e0110 - ::token_trees [INFO] [stderr] 12: 0x7727f3c1c314 - ::fully_expand_fragment [INFO] [stderr] 13: 0x7727f3be65d2 - ::expand_crate [INFO] [stderr] 14: 0x7727f2cf0af3 - rustc_interface[903e43df8d6bd657]::passes::configure_and_expand [INFO] [stderr] 15: 0x7727f3807658 - rustc_interface[903e43df8d6bd657]::passes::resolver_for_lowering_raw [INFO] [stderr] 16: 0x7727f38073cd - rustc_query_impl[8c5349e00d64015e]::plumbing::__rust_begin_short_backtrace::> [INFO] [stderr] 17: 0x7727f38073a7 - >::call_once [INFO] [stderr] 18: 0x7727f37ecb5f - rustc_query_system[d45be4fb383a0235]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[8c5349e00d64015e]::plumbing::QueryCtxt, false> [INFO] [stderr] 19: 0x7727f37ec6bc - rustc_query_impl[8c5349e00d64015e]::query_impl::resolver_for_lowering_raw::get_query_non_incr::__rust_end_short_backtrace [INFO] [stderr] 20: 0x7727f397127b - , rustc_driver_impl[3f9d6dd912ac34bd]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[75ca2badb63c4514]::ops::function::FnOnce<(&rustc_session[1e6875ba352dc1ba]::session::Session, rustc_middle[2342951a64deba5]::ty::context::CurrentGcx, alloc[d7482eb0f1d19161]::sync::Arc, &std[7d609349af90bec6]::sync::once_lock::OnceLock, &rustc_data_structures[c82a87ce5cdbfc92]::sync::worker_local::WorkerLocal, &rustc_data_structures[c82a87ce5cdbfc92]::sync::worker_local::WorkerLocal, rustc_driver_impl[3f9d6dd912ac34bd]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0} [INFO] [stderr] 21: 0x7727f385ac98 - rustc_interface[903e43df8d6bd657]::interface::run_compiler::<(), rustc_driver_impl[3f9d6dd912ac34bd]::run_compiler::{closure#0}>::{closure#1} [INFO] [stderr] 22: 0x7727f36eac4e - std[7d609349af90bec6]::sys::backtrace::__rust_begin_short_backtrace::::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> [INFO] [stderr] 23: 0x7727f36eaa20 - ::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[75ca2badb63c4514]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} [INFO] [stderr] 24: 0x7727f36ed138 - ::new::thread_start [INFO] [stderr] 25: 0x7727ed28aaa4 - [INFO] [stderr] 26: 0x7727ed317a64 - clone [INFO] [stderr] 27: 0x0 - [INFO] [stderr] [INFO] [stderr] error: the compiler unexpectedly panicked. this is a bug. [INFO] [stderr] [INFO] [stderr] 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 [INFO] [stderr] [INFO] [stderr] note: please make sure that you have updated to the latest nightly [INFO] [stderr] [INFO] [stderr] warning: the ICE couldn't be written to `/opt/rustwide/workdir/rustc-ice-2026-01-08T23_04_36-454.txt`: Read-only file system (os error 30) [INFO] [stderr] [INFO] [stderr] note: rustc 1.94.0-nightly (66388cc16 2026-01-08) running on x86_64-unknown-linux-gnu [INFO] [stderr] [INFO] [stderr] note: compiler flags: -C embed-bitcode=no -C debuginfo=2 [INFO] [stderr] [INFO] [stderr] note: some of the compiler flags provided by cargo are hidden [INFO] [stderr] [INFO] [stderr] query stack during panic: [INFO] [stderr] #0 [resolver_for_lowering_raw] getting the resolver for lowering [INFO] [stderr] end of query stack [INFO] [stderr] error: could not compile `stewart` (test "world") [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/66388cc165a6c4ac98c074dc9f0281ff23528c55/bin/rustc --crate-name world --edition=2021 tests/world.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --test --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=a5957cac86198dbf -C extra-filename=-fa3ce1d997a5f37a --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-e4212b79bc09e753.rmeta --extern stewart=/opt/rustwide/target/debug/deps/libstewart-d115e53d38af2f83.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-f276a9725189c2d6.rmeta --extern thunderdome=/opt/rustwide/target/debug/deps/libthunderdome-ef8139fbe29ebe1f.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-4edb325a0fc5419d.rmeta --extern tracing_subscriber=/opt/rustwide/target/debug/deps/libtracing_subscriber-0a0990139b75a044.rmeta --extern tracing_test=/opt/rustwide/target/debug/deps/libtracing_test-e142f35ead39bbd6.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-b8d8a20c59131dd8.rmeta --cap-lints=forbid` (exit status: 101) [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: value assigned to `source` is never read [INFO] [stdout] --> src/mailbox.rs:111:5 [INFO] [stdout] | [INFO] [stdout] 111 | source: Error, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `source` is never read [INFO] [stdout] --> src/world.rs:159:5 [INFO] [stdout] | [INFO] [stdout] 159 | source: Error, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "3936b65d3189890f079505267d079b0ff9d5e1ff7772d78c96b2aef7ebc26f5c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3936b65d3189890f079505267d079b0ff9d5e1ff7772d78c96b2aef7ebc26f5c", kill_on_drop: false }` [INFO] [stdout] 3936b65d3189890f079505267d079b0ff9d5e1ff7772d78c96b2aef7ebc26f5c