[INFO] cloning repository https://github.com/n3phtys/lmdb-rs-example-benchmark
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/n3phtys/lmdb-rs-example-benchmark" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fn3phtys%2Flmdb-rs-example-benchmark", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fn3phtys%2Flmdb-rs-example-benchmark'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1470ee0c2e69bded781bb0575841f1e3e1341672
[INFO] checking n3phtys/lmdb-rs-example-benchmark against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fn3phtys%2Flmdb-rs-example-benchmark" "/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/n3phtys/lmdb-rs-example-benchmark on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/n3phtys/lmdb-rs-example-benchmark
[INFO] finished tweaking git repo https://github.com/n3phtys/lmdb-rs-example-benchmark
[INFO] tweaked toml for git repo https://github.com/n3phtys/lmdb-rs-example-benchmark written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/n3phtys/lmdb-rs-example-benchmark already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde v1.0.11
[INFO] [stderr]   Downloaded lmdb v0.7.1
[INFO] [stderr]   Downloaded serde_json v1.0.2
[INFO] [stderr]   Downloaded lmdb-sys v0.7.1
[INFO] [stderr]   Downloaded serde_derive v1.0.11
[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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8a7cbe95d20a34ef73880c523524860a7520bc928a8eddf45fa9a1aefd881edc
[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" "8a7cbe95d20a34ef73880c523524860a7520bc928a8eddf45fa9a1aefd881edc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8a7cbe95d20a34ef73880c523524860a7520bc928a8eddf45fa9a1aefd881edc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a7cbe95d20a34ef73880c523524860a7520bc928a8eddf45fa9a1aefd881edc", kill_on_drop: false }`
[INFO] [stdout] 8a7cbe95d20a34ef73880c523524860a7520bc928a8eddf45fa9a1aefd881edc
[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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 528ee463b07f67e201cd4692d6d2763e0bc0a9f9ff993388fd5e240e0138c2d7
[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" "528ee463b07f67e201cd4692d6d2763e0bc0a9f9ff993388fd5e240e0138c2d7", kill_on_drop: false }`
[INFO] [stderr]    Compiling gcc v0.3.51
[INFO] [stderr]    Compiling pkg-config v0.3.9
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]     Checking dtoa v0.4.1
[INFO] [stderr]     Checking bitflags v0.9.1
[INFO] [stderr]     Checking itoa v0.3.1
[INFO] [stderr]     Checking serde v1.0.11
[INFO] [stderr]     Checking num-traits v0.1.40
[INFO] [stderr]     Checking rand v0.3.16
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling lmdb-sys v0.7.1
[INFO] [stderr]     Checking tempdir v0.3.5
[INFO] [stderr]     Checking lmdb v0.7.1
[INFO] [stderr]    Compiling serde_derive_internals v0.15.1
[INFO] [stderr]    Compiling serde_derive v1.0.11
[INFO] [stderr]     Checking serde_json v1.0.2
[INFO] [stderr]     Checking lmdb-rs-benchmark v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `database`
[INFO] [stdout]   --> benches/benchmark.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let database = db_environment.create_db(None, db_flags).unwrap();
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_database`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> benches/benchmark.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |             let key = transform_u32_to_array_of_u8(iteration);
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> benches/benchmark.rs:87:17
[INFO] [stdout]    |
[INFO] [stdout] 87 |             let key = transform_u32_to_array_of_u8(iteration);
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> benches/benchmark.rs:115:17
[INFO] [stdout]     |
[INFO] [stdout] 115 |             let key = transform_u32_to_array_of_u8(iteration);
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `db_flags`
[INFO] [stdout]    --> benches/benchmark.rs:131:13
[INFO] [stdout]     |
[INFO] [stdout] 131 |         let db_flags: lmdb::DatabaseFlags = lmdb::DatabaseFlags::empty();
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_db_flags`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `db_environment`
[INFO] [stdout]    --> benches/benchmark.rs:132:13
[INFO] [stdout]     |
[INFO] [stdout] 132 |         let db_environment = lmdb::Environment::new().set_max_dbs(1).open(dir.as_ref()).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_db_environment`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> benches/benchmark.rs:143:17
[INFO] [stdout]     |
[INFO] [stdout] 143 |             let key = transform_u32_to_array_of_u8(iteration);
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.79s
[INFO] running `Command { std: "docker" "inspect" "528ee463b07f67e201cd4692d6d2763e0bc0a9f9ff993388fd5e240e0138c2d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "528ee463b07f67e201cd4692d6d2763e0bc0a9f9ff993388fd5e240e0138c2d7", kill_on_drop: false }`
[INFO] [stdout] 528ee463b07f67e201cd4692d6d2763e0bc0a9f9ff993388fd5e240e0138c2d7