[INFO] cloning repository https://github.com/plorefice/b2048
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/plorefice/b2048" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplorefice%2Fb2048", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplorefice%2Fb2048'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7c0b69071e81abb9bdb12a77ab73f33af61b8576
[INFO] testing plorefice/b2048 against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplorefice%2Fb2048" "/workspace/builds/worker-30/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-30/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/plorefice/b2048 on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/plorefice/b2048
[INFO] finished tweaking git repo https://github.com/plorefice/b2048
[INFO] tweaked toml for git repo https://github.com/plorefice/b2048 written to /workspace/builds/worker-30/source/Cargo.toml
[INFO] crate git repo https://github.com/plorefice/b2048 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ncurses v5.91.0
[INFO] [stderr]   Downloaded num-traits v0.1.42
[INFO] [stderr]   Downloaded num-rational v0.1.41
[INFO] [stderr]   Downloaded num-complex v0.1.41
[INFO] [stderr]   Downloaded num-bigint v0.1.41
[INFO] [stderr]   Downloaded cursive v0.7.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d214d450a3d66741a6a55aa1aa74f2f770f5b3e9618a19d86fef2a350306b2a
[INFO] running `Command { std: "docker" "start" "-a" "0d214d450a3d66741a6a55aa1aa74f2f770f5b3e9618a19d86fef2a350306b2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d214d450a3d66741a6a55aa1aa74f2f770f5b3e9618a19d86fef2a350306b2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d214d450a3d66741a6a55aa1aa74f2f770f5b3e9618a19d86fef2a350306b2a", kill_on_drop: false }`
[INFO] [stdout] 0d214d450a3d66741a6a55aa1aa74f2f770f5b3e9618a19d86fef2a350306b2a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 281d713b1c01119c5d5ae2a7652e170a746bfe3be94c9e3ce948e54f93b7e457
[INFO] running `Command { std: "docker" "start" "-a" "281d713b1c01119c5d5ae2a7652e170a746bfe3be94c9e3ce948e54f93b7e457", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling num-traits v0.1.42
[INFO] [stderr]    Compiling libc v0.2.36
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling gcc v0.3.54
[INFO] [stderr]    Compiling pkg-config v0.3.9
[INFO] [stderr]    Compiling cfg-if v0.1.2
[INFO] [stderr]    Compiling serde v1.0.27
[INFO] [stderr]    Compiling stable_deref_trait v1.0.0
[INFO] [stderr]    Compiling unicode-width v0.1.4
[INFO] [stderr]    Compiling unicode-segmentation v1.2.0
[INFO] [stderr]    Compiling maplit v1.0.1
[INFO] [stderr]    Compiling log v0.4.1
[INFO] [stderr]    Compiling owning_ref v0.3.3
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling rand v0.3.20
[INFO] [stderr]    Compiling num-integer v0.1.35
[INFO] [stderr]    Compiling ncurses v5.91.0
[INFO] [stderr]    Compiling num-complex v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.1.41
[INFO] [stderr]    Compiling num-iter v0.1.34
[INFO] [stderr]    Compiling toml v0.4.5
[INFO] [stderr]    Compiling num-rational v0.1.41
[INFO] [stderr]    Compiling num v0.1.41
[INFO] [stderr]    Compiling cursive v0.7.5
[INFO] [stderr]    Compiling b2048 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `score`
[INFO] [stdout]   --> src/board.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     score: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(conservative_impl_trait)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 41.40s
[INFO] running `Command { std: "docker" "inspect" "281d713b1c01119c5d5ae2a7652e170a746bfe3be94c9e3ce948e54f93b7e457", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "281d713b1c01119c5d5ae2a7652e170a746bfe3be94c9e3ce948e54f93b7e457", kill_on_drop: false }`
[INFO] [stdout] 281d713b1c01119c5d5ae2a7652e170a746bfe3be94c9e3ce948e54f93b7e457
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91069591c8478ea91807d03a8bfd4cddf9313b90bf6f7970266e7b6e6c7bf825
[INFO] running `Command { std: "docker" "start" "-a" "91069591c8478ea91807d03a8bfd4cddf9313b90bf6f7970266e7b6e6c7bf825", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling b2048 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `score`
[INFO] [stdout]   --> src/board.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     score: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(conservative_impl_trait)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.30s
[INFO] running `Command { std: "docker" "inspect" "91069591c8478ea91807d03a8bfd4cddf9313b90bf6f7970266e7b6e6c7bf825", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91069591c8478ea91807d03a8bfd4cddf9313b90bf6f7970266e7b6e6c7bf825", kill_on_drop: false }`
[INFO] [stdout] 91069591c8478ea91807d03a8bfd4cddf9313b90bf6f7970266e7b6e6c7bf825
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 17354cfd1c34f0a800258611a447180212455ffc1801e6a57498808089bcfb83
[INFO] running `Command { std: "docker" "start" "-a" "17354cfd1c34f0a800258611a447180212455ffc1801e6a57498808089bcfb83", kill_on_drop: false }`
[INFO] [stderr] warning: field is never read: `score`
[INFO] [stderr]   --> src/board.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     score: u32,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(conservative_impl_trait)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `b2048` (bin "b2048" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/b2048-5f529d84752a2989)
[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" "17354cfd1c34f0a800258611a447180212455ffc1801e6a57498808089bcfb83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17354cfd1c34f0a800258611a447180212455ffc1801e6a57498808089bcfb83", kill_on_drop: false }`
[INFO] [stdout] 17354cfd1c34f0a800258611a447180212455ffc1801e6a57498808089bcfb83