[INFO] cloning repository https://github.com/michaelvoronov/rust_poc_1
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/michaelvoronov/rust_poc_1" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmichaelvoronov%2Frust_poc_1", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmichaelvoronov%2Frust_poc_1'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6bd20d5d4d58974fe47748052545dd8c15d67719
[INFO] testing michaelvoronov/rust_poc_1 against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmichaelvoronov%2Frust_poc_1" "/workspace/builds/worker-79/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-79/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/michaelvoronov/rust_poc_1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/michaelvoronov/rust_poc_1
[INFO] finished tweaking git repo https://github.com/michaelvoronov/rust_poc_1
[INFO] tweaked toml for git repo https://github.com/michaelvoronov/rust_poc_1 written to /workspace/builds/worker-79/source/Cargo.toml
[INFO] crate git repo https://github.com/michaelvoronov/rust_poc_1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1bd7bb394d3d73cae20b9356a8ddda7a2dd78b19632acc8a2fef5eac31f23211
[INFO] running `Command { std: "docker" "start" "-a" "1bd7bb394d3d73cae20b9356a8ddda7a2dd78b19632acc8a2fef5eac31f23211", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1bd7bb394d3d73cae20b9356a8ddda7a2dd78b19632acc8a2fef5eac31f23211", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bd7bb394d3d73cae20b9356a8ddda7a2dd78b19632acc8a2fef5eac31f23211", kill_on_drop: false }`
[INFO] [stdout] 1bd7bb394d3d73cae20b9356a8ddda7a2dd78b19632acc8a2fef5eac31f23211
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8e63de6331f8bd929ea931f1083c35fac207197986b25c780cef58433eb3fc9a
[INFO] running `Command { std: "docker" "start" "-a" "8e63de6331f8bd929ea931f1083c35fac207197986b25c780cef58433eb3fc9a", kill_on_drop: false }`
[INFO] [stderr]    Compiling arraydeque v0.4.3
[INFO] [stderr]    Compiling rust_experiments v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `field`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     field: i32
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `field`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     field: ArrayDeque<[Rc<RefCell<SomeStruct>>; 1024], Wrapping>
[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 1.07s
[INFO] running `Command { std: "docker" "inspect" "8e63de6331f8bd929ea931f1083c35fac207197986b25c780cef58433eb3fc9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e63de6331f8bd929ea931f1083c35fac207197986b25c780cef58433eb3fc9a", kill_on_drop: false }`
[INFO] [stdout] 8e63de6331f8bd929ea931f1083c35fac207197986b25c780cef58433eb3fc9a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a509c9c55593ab3faa15dac94ec995db6b748aafa33366f6576d82ef9fa186e0
[INFO] running `Command { std: "docker" "start" "-a" "a509c9c55593ab3faa15dac94ec995db6b748aafa33366f6576d82ef9fa186e0", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust_experiments v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `field`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     field: i32
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `field`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     field: ArrayDeque<[Rc<RefCell<SomeStruct>>; 1024], Wrapping>
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 10.28s
[INFO] running `Command { std: "docker" "inspect" "a509c9c55593ab3faa15dac94ec995db6b748aafa33366f6576d82ef9fa186e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a509c9c55593ab3faa15dac94ec995db6b748aafa33366f6576d82ef9fa186e0", kill_on_drop: false }`
[INFO] [stdout] a509c9c55593ab3faa15dac94ec995db6b748aafa33366f6576d82ef9fa186e0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 80ba85ab2456c17c93cf28fab48d106044ccc3008e81bebdc877fff1ba2f1a94
[INFO] running `Command { std: "docker" "start" "-a" "80ba85ab2456c17c93cf28fab48d106044ccc3008e81bebdc877fff1ba2f1a94", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: field is never read: `field`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     field: i32
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `field`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     field: ArrayDeque<[Rc<RefCell<SomeStruct>>; 1024], Wrapping>
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_experiments` (bin "rust_experiments" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.63s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_experiments-00629b487b9d89d6)
[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" "80ba85ab2456c17c93cf28fab48d106044ccc3008e81bebdc877fff1ba2f1a94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80ba85ab2456c17c93cf28fab48d106044ccc3008e81bebdc877fff1ba2f1a94", kill_on_drop: false }`
[INFO] [stdout] 80ba85ab2456c17c93cf28fab48d106044ccc3008e81bebdc877fff1ba2f1a94