[INFO] cloning repository https://github.com/bwhetherington/rust-2048
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bwhetherington/rust-2048" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbwhetherington%2Frust-2048", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbwhetherington%2Frust-2048'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c80aad95941ca1f8797613d73ab44044c3178f40
[INFO] checking bwhetherington/rust-2048 against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbwhetherington%2Frust-2048" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bwhetherington/rust-2048 on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bwhetherington/rust-2048
[INFO] finished tweaking git repo https://github.com/bwhetherington/rust-2048
[INFO] tweaked toml for git repo https://github.com/bwhetherington/rust-2048 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/bwhetherington/rust-2048 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "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] 51c722bcf3193dc58c34309b48bf39a9fcf9af7cd0b72ef77313cf94982f414e
[INFO] running `Command { std: "docker" "start" "-a" "51c722bcf3193dc58c34309b48bf39a9fcf9af7cd0b72ef77313cf94982f414e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "51c722bcf3193dc58c34309b48bf39a9fcf9af7cd0b72ef77313cf94982f414e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "51c722bcf3193dc58c34309b48bf39a9fcf9af7cd0b72ef77313cf94982f414e", kill_on_drop: false }`
[INFO] [stdout] 51c722bcf3193dc58c34309b48bf39a9fcf9af7cd0b72ef77313cf94982f414e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e36ee1d0776ccecd3f29205dfb7a785f18936725f801fa5ee51f8b640ba92b92
[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" "e36ee1d0776ccecd3f29205dfb7a785f18936725f801fa5ee51f8b640ba92b92", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rust-2048-2 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `game::*`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use game::*;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `game::*`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use game::*;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let d: Matrix<_> = m.diag().into();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/game/mod.rs:74:13
[INFO] [stdout]    |
[INFO] [stdout] 74 |         for j in 0..source.cols() {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]   --> src/game/mod.rs:70:37
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn slide_left(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                                     ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]   --> src/game/mod.rs:82:16
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn slide_right(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]   --> src/game/mod.rs:82:38
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn slide_right(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]   --> src/game/mod.rs:88:13
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn slide_up(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]   --> src/game/mod.rs:88:35
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn slide_up(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                                   ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]   --> src/game/mod.rs:94:15
[INFO] [stdout]    |
[INFO] [stdout] 94 | fn slide_down(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]   --> src/game/mod.rs:94:37
[INFO] [stdout]    |
[INFO] [stdout] 94 | fn slide_down(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                                     ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let d: Matrix<_> = m.diag().into();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/game/mod.rs:74:13
[INFO] [stdout]    |
[INFO] [stdout] 74 |         for j in 0..source.cols() {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]   --> src/game/mod.rs:70:37
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn slide_left(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                                     ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]   --> src/game/mod.rs:82:16
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn slide_right(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]   --> src/game/mod.rs:82:38
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn slide_right(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]   --> src/game/mod.rs:88:13
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn slide_up(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]   --> src/game/mod.rs:88:35
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn slide_up(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                                   ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]   --> src/game/mod.rs:94:15
[INFO] [stdout]    |
[INFO] [stdout] 94 | fn slide_down(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]   --> src/game/mod.rs:94:37
[INFO] [stdout]    |
[INFO] [stdout] 94 | fn slide_down(source: &Matrix<u32>, dest: &mut Matrix<u32>) {
[INFO] [stdout]    |                                     ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "e36ee1d0776ccecd3f29205dfb7a785f18936725f801fa5ee51f8b640ba92b92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e36ee1d0776ccecd3f29205dfb7a785f18936725f801fa5ee51f8b640ba92b92", kill_on_drop: false }`
[INFO] [stdout] e36ee1d0776ccecd3f29205dfb7a785f18936725f801fa5ee51f8b640ba92b92