[INFO] fetching crate welford 0.1.0...
[INFO] testing welford-0.1.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate welford 0.1.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate welford 0.1.0 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate welford 0.1.0
[INFO] finished tweaking crates.io crate welford 0.1.0
[INFO] tweaked toml for crates.io crate welford 0.1.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate welford 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 52fbc94dc387a03a698014ba9e717d678cd82006df3ad99f1bf3bacca0276923
[INFO] running `Command { std: "docker" "start" "-a" "52fbc94dc387a03a698014ba9e717d678cd82006df3ad99f1bf3bacca0276923", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "52fbc94dc387a03a698014ba9e717d678cd82006df3ad99f1bf3bacca0276923", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52fbc94dc387a03a698014ba9e717d678cd82006df3ad99f1bf3bacca0276923", kill_on_drop: false }`
[INFO] [stdout] 52fbc94dc387a03a698014ba9e717d678cd82006df3ad99f1bf3bacca0276923
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 21461cbc583923f7365fb1105ee97547987b1b0ccd0afa96515a14c91402c8f7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "21461cbc583923f7365fb1105ee97547987b1b0ccd0afa96515a14c91402c8f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling welford v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `merge`
[INFO] [stdout]    --> src/lib.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 100 |     fn merge(&mut self, other: Self) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.19s
[INFO] running `Command { std: "docker" "inspect" "21461cbc583923f7365fb1105ee97547987b1b0ccd0afa96515a14c91402c8f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21461cbc583923f7365fb1105ee97547987b1b0ccd0afa96515a14c91402c8f7", kill_on_drop: false }`
[INFO] [stdout] 21461cbc583923f7365fb1105ee97547987b1b0ccd0afa96515a14c91402c8f7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c0475a1cde566d57cd6eaf50d4fbc3eb26a2c49784cdf6bf1facdf2178a4a1da
[INFO] running `Command { std: "docker" "start" "-a" "c0475a1cde566d57cd6eaf50d4fbc3eb26a2c49784cdf6bf1facdf2178a4a1da", kill_on_drop: false }`
[INFO] [stderr]    Compiling welford v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `merge`
[INFO] [stdout]    --> src/lib.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 100 |     fn merge(&mut self, other: Self) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.36s
[INFO] [stderr]   Executable unittests src/lib.rs (/opt/rustwide/target/debug/deps/welford-27a473ef06f25b56)
[INFO] running `Command { std: "docker" "inspect" "c0475a1cde566d57cd6eaf50d4fbc3eb26a2c49784cdf6bf1facdf2178a4a1da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0475a1cde566d57cd6eaf50d4fbc3eb26a2c49784cdf6bf1facdf2178a4a1da", kill_on_drop: false }`
[INFO] [stdout] c0475a1cde566d57cd6eaf50d4fbc3eb26a2c49784cdf6bf1facdf2178a4a1da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d687d5db93845842aa284942ce2b399bacf759df2e51300918cf0cd1ee687dec
[INFO] running `Command { std: "docker" "start" "-a" "d687d5db93845842aa284942ce2b399bacf759df2e51300918cf0cd1ee687dec", kill_on_drop: false }`
[INFO] [stderr] warning: associated function is never used: `merge`
[INFO] [stdout] 
[INFO] [stderr]    --> src/lib.rs:100:8
[INFO] [stdout] running 4 tests
[INFO] [stderr]     |
[INFO] [stderr] 100 |     fn merge(&mut self, other: Self) {
[INFO] [stderr]     |        ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `welford` (lib) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/welford-27a473ef06f25b56)
[INFO] [stderr]    Doc-tests welford
[INFO] [stdout] test tests::test_weighted_merge ... ok
[INFO] [stdout] test tests::test_weighted_welford ... ok
[INFO] [stdout] test tests::test_welford ... ok
[INFO] [stdout] test tests::test_merge ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[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" "d687d5db93845842aa284942ce2b399bacf759df2e51300918cf0cd1ee687dec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d687d5db93845842aa284942ce2b399bacf759df2e51300918cf0cd1ee687dec", kill_on_drop: false }`
[INFO] [stdout] d687d5db93845842aa284942ce2b399bacf759df2e51300918cf0cd1ee687dec