[INFO] fetching crate unionfind 0.2.1...
[INFO] testing unionfind-0.2.1 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate unionfind 0.2.1 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate unionfind 0.2.1
[INFO] finished tweaking crates.io crate unionfind 0.2.1
[INFO] tweaked toml for crates.io crate unionfind 0.2.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate unionfind 0.2.1 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 6 packages to latest compatible versions
[INFO] [stderr]       Adding thiserror v1.0.69 (available: v2.0.17)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b7be680e086e5c4e7af5f9e45705e8235153679a7c2f43bb399cb7a170f3911f
[INFO] running `Command { std: "docker" "start" "-a" "b7be680e086e5c4e7af5f9e45705e8235153679a7c2f43bb399cb7a170f3911f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b7be680e086e5c4e7af5f9e45705e8235153679a7c2f43bb399cb7a170f3911f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7be680e086e5c4e7af5f9e45705e8235153679a7c2f43bb399cb7a170f3911f", kill_on_drop: false }`
[INFO] [stdout] b7be680e086e5c4e7af5f9e45705e8235153679a7c2f43bb399cb7a170f3911f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ca67fdf0b5cad63084c8f34afab99b3e9c078b691ef443c16d8e8398eb7219c3
[INFO] running `Command { std: "docker" "start" "-a" "ca67fdf0b5cad63084c8f34afab99b3e9c078b691ef443c16d8e8398eb7219c3", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling unionfind v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `FixedSize` is never constructed
[INFO] [stdout]    --> src/mapping.rs:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 | struct FixedSize<M>(M);
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.64s
[INFO] running `Command { std: "docker" "inspect" "ca67fdf0b5cad63084c8f34afab99b3e9c078b691ef443c16d8e8398eb7219c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca67fdf0b5cad63084c8f34afab99b3e9c078b691ef443c16d8e8398eb7219c3", kill_on_drop: false }`
[INFO] [stdout] ca67fdf0b5cad63084c8f34afab99b3e9c078b691ef443c16d8e8398eb7219c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2cb70c8decb5584f7ca5d60cd5036a918da1bad24bdb0dc0450cd3157c6fd710
[INFO] running `Command { std: "docker" "start" "-a" "2cb70c8decb5584f7ca5d60cd5036a918da1bad24bdb0dc0450cd3157c6fd710", kill_on_drop: false }`
[INFO] [stderr]    Compiling unionfind v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `FixedSize` is never constructed
[INFO] [stdout]    --> src/mapping.rs:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 | struct FixedSize<M>(M);
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FixedSize` is never constructed
[INFO] [stdout]    --> src/mapping.rs:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 | struct FixedSize<M>(M);
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.72s
[INFO] running `Command { std: "docker" "inspect" "2cb70c8decb5584f7ca5d60cd5036a918da1bad24bdb0dc0450cd3157c6fd710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cb70c8decb5584f7ca5d60cd5036a918da1bad24bdb0dc0450cd3157c6fd710", kill_on_drop: false }`
[INFO] [stdout] 2cb70c8decb5584f7ca5d60cd5036a918da1bad24bdb0dc0450cd3157c6fd710
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 273b86fc3f89b58f12b59bda55b25ed77b96f5270c0b059db5724cfee5d5e60c
[INFO] running `Command { std: "docker" "start" "-a" "273b86fc3f89b58f12b59bda55b25ed77b96f5270c0b059db5724cfee5d5e60c", kill_on_drop: false }`
[INFO] [stderr] warning: struct `FixedSize` is never constructed
[INFO] [stderr]    --> src/mapping.rs:284:8
[INFO] [stderr]     |
[INFO] [stderr] 284 | struct FixedSize<M>(M);
[INFO] [stderr]     |        ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `unionfind` (lib) generated 1 warning
[INFO] [stderr] warning: `unionfind` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/unionfind-30355190c382dd63)
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test tests::grow ... ok
[INFO] [stdout] test tests::custom_uf ... ok
[INFO] [stdout] test tests::or_add ... ok
[INFO] [stdout] test tests::or_add_by_rank ... ok
[INFO] [stdout] test tests::grow_non_consecutive ... ok
[INFO] [stdout] test tests::not_in_order ... ok
[INFO] [stdout] test tests::union ... ok
[INFO] [stdout] test tests::simple ... ok
[INFO] [stdout] test tests::union_by ... ok
[INFO] [stdout] test tests::union_by_rank ... ok
[INFO] [stdout] test tests::double_union ... ok
[INFO] [stderr]    Doc-tests unionfind
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "273b86fc3f89b58f12b59bda55b25ed77b96f5270c0b059db5724cfee5d5e60c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "273b86fc3f89b58f12b59bda55b25ed77b96f5270c0b059db5724cfee5d5e60c", kill_on_drop: false }`
[INFO] [stdout] 273b86fc3f89b58f12b59bda55b25ed77b96f5270c0b059db5724cfee5d5e60c