[INFO] cloning repository https://github.com/sprengvogel/rust-collatz
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sprengvogel/rust-collatz" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsprengvogel%2Frust-collatz", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsprengvogel%2Frust-collatz'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3f652b6e330212961dbbb905adf49d856155107f
[INFO] testing sprengvogel/rust-collatz against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsprengvogel%2Frust-collatz" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sprengvogel/rust-collatz on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sprengvogel/rust-collatz
[INFO] finished tweaking git repo https://github.com/sprengvogel/rust-collatz
[INFO] tweaked toml for git repo https://github.com/sprengvogel/rust-collatz written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/sprengvogel/rust-collatz already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num-bigint v0.2.1
[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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f82395041fe0c2599e48d528b117fbb666942024de487c8fc0c836dedd94df2e
[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" "f82395041fe0c2599e48d528b117fbb666942024de487c8fc0c836dedd94df2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f82395041fe0c2599e48d528b117fbb666942024de487c8fc0c836dedd94df2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f82395041fe0c2599e48d528b117fbb666942024de487c8fc0c836dedd94df2e", kill_on_drop: false }`
[INFO] [stdout] f82395041fe0c2599e48d528b117fbb666942024de487c8fc0c836dedd94df2e
[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=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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b9ac54c8503cf0d72288b21bce60da18d32faf9909228f56e4c3791a990bf223
[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" "b9ac54c8503cf0d72288b21bce60da18d32faf9909228f56e4c3791a990bf223", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling num-bigint v0.2.1
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling collatz v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `do_collatz_without_overflow_check`
[INFO] [stdout]   --> src/main.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn do_collatz_without_overflow_check(mut x: u64) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `do_collatz_with_bigints`
[INFO] [stdout]   --> src/main.rs:75:4
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn do_collatz_with_bigints(mut x: BigUint) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.94s
[INFO] running `Command { std: "docker" "inspect" "b9ac54c8503cf0d72288b21bce60da18d32faf9909228f56e4c3791a990bf223", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9ac54c8503cf0d72288b21bce60da18d32faf9909228f56e4c3791a990bf223", kill_on_drop: false }`
[INFO] [stdout] b9ac54c8503cf0d72288b21bce60da18d32faf9909228f56e4c3791a990bf223
[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=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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b7a4631684de47164802700994a77beeeb4a21cfdbaabf07d55ff6c908045763
[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" "b7a4631684de47164802700994a77beeeb4a21cfdbaabf07d55ff6c908045763", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling collatz v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.78s
[INFO] running `Command { std: "docker" "inspect" "b7a4631684de47164802700994a77beeeb4a21cfdbaabf07d55ff6c908045763", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7a4631684de47164802700994a77beeeb4a21cfdbaabf07d55ff6c908045763", kill_on_drop: false }`
[INFO] [stdout] b7a4631684de47164802700994a77beeeb4a21cfdbaabf07d55ff6c908045763
[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=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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 413ec7a2531bc80a38f95f2cb56d883bf925a8996407eb0b6449ad87a9ac9e97
[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" "413ec7a2531bc80a38f95f2cb56d883bf925a8996407eb0b6449ad87a9ac9e97", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/collatz-5e42789940e8aa34)
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::bench_collatz ... ok
[INFO] [stdout] test tests::bench_collatz_without_overflow_check ... ok
[INFO] [stdout] test tests::bench_do_collatz_with_bigints ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "413ec7a2531bc80a38f95f2cb56d883bf925a8996407eb0b6449ad87a9ac9e97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "413ec7a2531bc80a38f95f2cb56d883bf925a8996407eb0b6449ad87a9ac9e97", kill_on_drop: false }`
[INFO] [stdout] 413ec7a2531bc80a38f95f2cb56d883bf925a8996407eb0b6449ad87a9ac9e97