[INFO] cloning repository https://github.com/hhanh00/2048-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hhanh00/2048-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhhanh00%2F2048-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhhanh00%2F2048-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e3fe7d8ec592b499db67aeaffc2f26c8c0b8bae2
[INFO] testing hhanh00/2048-solver against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhhanh00%2F2048-solver" "/workspace/builds/worker-60/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-60/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hhanh00/2048-solver on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hhanh00/2048-solver
[INFO] finished tweaking git repo https://github.com/hhanh00/2048-solver
[INFO] tweaked toml for git repo https://github.com/hhanh00/2048-solver written to /workspace/builds/worker-60/source/Cargo.toml
[INFO] crate git repo https://github.com/hhanh00/2048-solver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 726495b74c21a550574cd496a8d675f6d9df533cd64faf5359b1db130edb72f6
[INFO] running `Command { std: "docker" "start" "-a" "726495b74c21a550574cd496a8d675f6d9df533cd64faf5359b1db130edb72f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "726495b74c21a550574cd496a8d675f6d9df533cd64faf5359b1db130edb72f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "726495b74c21a550574cd496a8d675f6d9df533cd64faf5359b1db130edb72f6", kill_on_drop: false }`
[INFO] [stdout] 726495b74c21a550574cd496a8d675f6d9df533cd64faf5359b1db130edb72f6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1dbe381c674c6f23bf86a71b33049d798e92234155dd55e002fce8e75cce5816
[INFO] running `Command { std: "docker" "start" "-a" "1dbe381c674c6f23bf86a71b33049d798e92234155dd55e002fce8e75cce5816", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling getrandom v0.1.12
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.5
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.2
[INFO] [stderr]    Compiling game_2048 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:162:17
[INFO] [stdout]     |
[INFO] [stdout] 162 |             for i in 0..nsamples {
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:156:17
[INFO] [stdout]     |
[INFO] [stdout] 156 |             let mut base_score;
[INFO] [stdout]     |                 ----^^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set`
[INFO] [stdout]   --> src/main.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn set(&mut self, i: usize, j: usize, v: i32) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `nsamples` should have an upper case name
[INFO] [stdout]  --> src/main.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const nsamples: usize = 500;
[INFO] [stdout]   |       ^^^^^^^^ help: convert the identifier to upper case: `NSAMPLES`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.63s
[INFO] running `Command { std: "docker" "inspect" "1dbe381c674c6f23bf86a71b33049d798e92234155dd55e002fce8e75cce5816", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1dbe381c674c6f23bf86a71b33049d798e92234155dd55e002fce8e75cce5816", kill_on_drop: false }`
[INFO] [stdout] 1dbe381c674c6f23bf86a71b33049d798e92234155dd55e002fce8e75cce5816
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b83def86afb6f02246676691fc2067c223412afce24e653936a4448e0188150
[INFO] running `Command { std: "docker" "start" "-a" "3b83def86afb6f02246676691fc2067c223412afce24e653936a4448e0188150", kill_on_drop: false }`
[INFO] [stderr]    Compiling game_2048 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:162:17
[INFO] [stdout]     |
[INFO] [stdout] 162 |             for i in 0..nsamples {
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:156:17
[INFO] [stdout]     |
[INFO] [stdout] 156 |             let mut base_score;
[INFO] [stdout]     |                 ----^^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set`
[INFO] [stdout]   --> src/main.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn set(&mut self, i: usize, j: usize, v: i32) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `nsamples` should have an upper case name
[INFO] [stdout]  --> src/main.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const nsamples: usize = 500;
[INFO] [stdout]   |       ^^^^^^^^ help: convert the identifier to upper case: `NSAMPLES`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.18s
[INFO] running `Command { std: "docker" "inspect" "3b83def86afb6f02246676691fc2067c223412afce24e653936a4448e0188150", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b83def86afb6f02246676691fc2067c223412afce24e653936a4448e0188150", kill_on_drop: false }`
[INFO] [stdout] 3b83def86afb6f02246676691fc2067c223412afce24e653936a4448e0188150
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 94efd7f86d525bbd2387b2db0c7a0bb272f1905c747e862ad50b0f432911a9f1
[INFO] running `Command { std: "docker" "start" "-a" "94efd7f86d525bbd2387b2db0c7a0bb272f1905c747e862ad50b0f432911a9f1", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/main.rs:162:17
[INFO] [stderr]     |
[INFO] [stderr] 162 |             for i in 0..nsamples {
[INFO] [stderr]     |                 ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:156:17
[INFO] [stderr]     |
[INFO] [stderr] 156 |             let mut base_score;
[INFO] [stderr]     |                 ----^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `set`
[INFO] [stderr]   --> src/main.rs:36:8
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fn set(&mut self, i: usize, j: usize, v: i32) {
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant `nsamples` should have an upper case name
[INFO] [stderr]  --> src/main.rs:5:7
[INFO] [stderr]   |
[INFO] [stderr] 5 | const nsamples: usize = 500;
[INFO] [stderr]   |       ^^^^^^^^ help: convert the identifier to upper case: `NSAMPLES`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `game_2048` (bin "game_2048" test) generated 4 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.15s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/game_2048-3f25b3201802d4f6)
[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" "94efd7f86d525bbd2387b2db0c7a0bb272f1905c747e862ad50b0f432911a9f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94efd7f86d525bbd2387b2db0c7a0bb272f1905c747e862ad50b0f432911a9f1", kill_on_drop: false }`
[INFO] [stdout] 94efd7f86d525bbd2387b2db0c7a0bb272f1905c747e862ad50b0f432911a9f1