[INFO] fetching crate unionfind 0.2.1...
[INFO] testing unionfind-0.2.1 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-8
[INFO] extracting crate unionfind 0.2.1 into /workspace/builds/worker-6-tc1/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-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate unionfind 0.2.1 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "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" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "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" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7ac2e26272ffac9a94d57e74b5bbe4cd3c8950a2df83e49dd1e935f0a72518d4
[INFO] running `Command { std: "docker" "start" "-a" "7ac2e26272ffac9a94d57e74b5bbe4cd3c8950a2df83e49dd1e935f0a72518d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ac2e26272ffac9a94d57e74b5bbe4cd3c8950a2df83e49dd1e935f0a72518d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ac2e26272ffac9a94d57e74b5bbe4cd3c8950a2df83e49dd1e935f0a72518d4", kill_on_drop: false }`
[INFO] [stdout] 7ac2e26272ffac9a94d57e74b5bbe4cd3c8950a2df83e49dd1e935f0a72518d4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bc627c3a4123a1f8206f7509d9f0656fe789236e22775e15c206ad2531e7486c
[INFO] running `Command { std: "docker" "start" "-a" "bc627c3a4123a1f8206f7509d9f0656fe789236e22775e15c206ad2531e7486c", 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.32s
[INFO] running `Command { std: "docker" "inspect" "bc627c3a4123a1f8206f7509d9f0656fe789236e22775e15c206ad2531e7486c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc627c3a4123a1f8206f7509d9f0656fe789236e22775e15c206ad2531e7486c", kill_on_drop: false }`
[INFO] [stdout] bc627c3a4123a1f8206f7509d9f0656fe789236e22775e15c206ad2531e7486c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 36a85f266163384d8b16d9026866247aca9ff0e3cec87bdd023aca99b3ce6b57
[INFO] running `Command { std: "docker" "start" "-a" "36a85f266163384d8b16d9026866247aca9ff0e3cec87bdd023aca99b3ce6b57", kill_on_drop: false }`
[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]    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 `test` profile [unoptimized + debuginfo] target(s) in 1.16s
[INFO] running `Command { std: "docker" "inspect" "36a85f266163384d8b16d9026866247aca9ff0e3cec87bdd023aca99b3ce6b57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36a85f266163384d8b16d9026866247aca9ff0e3cec87bdd023aca99b3ce6b57", kill_on_drop: false }`
[INFO] [stdout] 36a85f266163384d8b16d9026866247aca9ff0e3cec87bdd023aca99b3ce6b57
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c7d44cffd28d77a7c0ee5bb9f12b78dc483e34e504de61dc445917d7e55b687a
[INFO] running `Command { std: "docker" "start" "-a" "c7d44cffd28d77a7c0ee5bb9f12b78dc483e34e504de61dc445917d7e55b687a", 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-f5e324deb3c0d73d)
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test tests::custom_uf ... ok
[INFO] [stdout] test tests::double_union ... ok
[INFO] [stdout] test tests::grow_non_consecutive ... ok
[INFO] [stdout] test tests::grow ... ok
[INFO] [stdout] test tests::or_add_by_rank ... ok
[INFO] [stdout] test tests::simple ... ok
[INFO] [stdout] test tests::union ... ok
[INFO] [stdout] test tests::or_add ... ok
[INFO] [stdout] test tests::union_by ... ok
[INFO] [stdout] test tests::union_by_rank ... ok
[INFO] [stdout] test tests::not_in_order ... 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" "c7d44cffd28d77a7c0ee5bb9f12b78dc483e34e504de61dc445917d7e55b687a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7d44cffd28d77a7c0ee5bb9f12b78dc483e34e504de61dc445917d7e55b687a", kill_on_drop: false }`
[INFO] [stdout] c7d44cffd28d77a7c0ee5bb9f12b78dc483e34e504de61dc445917d7e55b687a