[INFO] cloning repository https://github.com/Borthralla/2048
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Borthralla/2048" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBorthralla%2F2048", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBorthralla%2F2048'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4b777c33aced36d1cd46f3473a1998b9f82c17b1
[INFO] checking Borthralla/2048 against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBorthralla%2F2048" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Borthralla/2048 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Borthralla/2048
[INFO] finished tweaking git repo https://github.com/Borthralla/2048
[INFO] tweaked toml for git repo https://github.com/Borthralla/2048 written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/Borthralla/2048 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d9c6e7cfd2574ce3ac1a70d8e7290021923f93f30cc78197607dbdf2d2df640f
[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" "d9c6e7cfd2574ce3ac1a70d8e7290021923f93f30cc78197607dbdf2d2df640f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d9c6e7cfd2574ce3ac1a70d8e7290021923f93f30cc78197607dbdf2d2df640f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9c6e7cfd2574ce3ac1a70d8e7290021923f93f30cc78197607dbdf2d2df640f", kill_on_drop: false }`
[INFO] [stdout] d9c6e7cfd2574ce3ac1a70d8e7290021923f93f30cc78197607dbdf2d2df640f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d6d0b31da8a82359455d459196ebb6543896a881b3d8d088932f81e6a3efb5f
[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" "8d6d0b31da8a82359455d459196ebb6543896a881b3d8d088932f81e6a3efb5f", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking play_2048 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> src/main.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::{Duration, Instant};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> src/main.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::{Duration, Instant};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:106:7
[INFO] [stdout]     |
[INFO] [stdout] 106 |             if (*val != 0u8) {
[INFO] [stdout]     |                ^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `while` condition
[INFO] [stdout]    --> src/main.rs:160:8
[INFO] [stdout]     |
[INFO] [stdout] 160 |         while(next_states.len() > 0) {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:106:7
[INFO] [stdout]     |
[INFO] [stdout] 106 |             if (*val != 0u8) {
[INFO] [stdout]     |                ^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `while` condition
[INFO] [stdout]    --> src/main.rs:204:8
[INFO] [stdout]     |
[INFO] [stdout] 204 |         while(next_states.len() > 0) {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `while` condition
[INFO] [stdout]    --> src/main.rs:160:8
[INFO] [stdout]     |
[INFO] [stdout] 160 |         while(next_states.len() > 0) {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `while` condition
[INFO] [stdout]    --> src/main.rs:204:8
[INFO] [stdout]     |
[INFO] [stdout] 204 |         while(next_states.len() > 0) {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `while` condition
[INFO] [stdout]    --> src/main.rs:214:8
[INFO] [stdout]     |
[INFO] [stdout] 214 |         while(next_states.len() > 0) {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:231:8
[INFO] [stdout]     |
[INFO] [stdout] 231 |                 if (val != 0) {
[INFO] [stdout]     |                    ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `while` condition
[INFO] [stdout]    --> src/main.rs:214:8
[INFO] [stdout]     |
[INFO] [stdout] 214 |         while(next_states.len() > 0) {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:231:8
[INFO] [stdout]     |
[INFO] [stdout] 231 |                 if (val != 0) {
[INFO] [stdout]     |                    ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `average_score`
[INFO] [stdout]    --> src/main.rs:113:5
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn average_score(&self, iterations: i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `make_best_move`
[INFO] [stdout]    --> src/main.rs:140:5
[INFO] [stdout]     |
[INFO] [stdout] 140 |     fn make_best_move(&mut self, iterations: i32, next_states: Vec<State>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `play_best_game`
[INFO] [stdout]    --> src/main.rs:158:5
[INFO] [stdout]     |
[INFO] [stdout] 158 |     fn play_best_game(&mut self, iterations: i32) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parallel_timed_make_best_move`
[INFO] [stdout]    --> src/main.rs:181:5
[INFO] [stdout]     |
[INFO] [stdout] 181 |     fn parallel_timed_make_best_move(&mut self, duration: i32, next_states: Vec<State>, num_threads: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parallel_timed_play_best_game`
[INFO] [stdout]    --> src/main.rs:212:5
[INFO] [stdout]     |
[INFO] [stdout] 212 |     fn parallel_timed_play_best_game(&mut self, duration: i32, num_threads: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `average_score`
[INFO] [stdout]    --> src/main.rs:113:5
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn average_score(&self, iterations: i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `make_best_move`
[INFO] [stdout]    --> src/main.rs:140:5
[INFO] [stdout]     |
[INFO] [stdout] 140 |     fn make_best_move(&mut self, iterations: i32, next_states: Vec<State>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `play_best_game`
[INFO] [stdout]    --> src/main.rs:158:5
[INFO] [stdout]     |
[INFO] [stdout] 158 |     fn play_best_game(&mut self, iterations: i32) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parallel_timed_make_best_move`
[INFO] [stdout]    --> src/main.rs:181:5
[INFO] [stdout]     |
[INFO] [stdout] 181 |     fn parallel_timed_make_best_move(&mut self, duration: i32, next_states: Vec<State>, num_threads: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parallel_timed_play_best_game`
[INFO] [stdout]    --> src/main.rs:212:5
[INFO] [stdout]     |
[INFO] [stdout] 212 |     fn parallel_timed_play_best_game(&mut self, duration: i32, num_threads: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:253:6
[INFO] [stdout]     |
[INFO] [stdout] 253 |         writeln!(file, "{}", my_state);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:253:6
[INFO] [stdout]     |
[INFO] [stdout] 253 |         writeln!(file, "{}", my_state);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.26s
[INFO] running `Command { std: "docker" "inspect" "8d6d0b31da8a82359455d459196ebb6543896a881b3d8d088932f81e6a3efb5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d6d0b31da8a82359455d459196ebb6543896a881b3d8d088932f81e6a3efb5f", kill_on_drop: false }`
[INFO] [stdout] 8d6d0b31da8a82359455d459196ebb6543896a881b3d8d088932f81e6a3efb5f