[INFO] updating cached repository shinkwhek/rs2048
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/shinkwhek/rs2048
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/shinkwhek/rs2048" "work/ex/beta-1.37-6/sources/1.36.0/gh/shinkwhek/rs2048"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/shinkwhek/rs2048'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/shinkwhek/rs2048" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/shinkwhek/rs2048"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/shinkwhek/rs2048'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9dead87635a1b8a31c8348147960801b2a0082f5
[INFO] sha for GitHub repo shinkwhek/rs2048: 9dead87635a1b8a31c8348147960801b2a0082f5
[INFO] validating manifest of shinkwhek/rs2048 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of shinkwhek/rs2048 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing shinkwhek/rs2048
[INFO] finished frobbing shinkwhek/rs2048
[INFO] frobbed toml for shinkwhek/rs2048 written to work/ex/beta-1.37-6/sources/1.36.0/gh/shinkwhek/rs2048/Cargo.toml
[INFO] started frobbing shinkwhek/rs2048
[INFO] finished frobbing shinkwhek/rs2048
[INFO] frobbed toml for shinkwhek/rs2048 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/shinkwhek/rs2048/Cargo.toml
[INFO] crate shinkwhek/rs2048 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing shinkwhek/rs2048 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/shinkwhek/rs2048:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 828e4b52539c3b1e6d54a5e02c4be7aa7eb74c6e445f02ca0a669e02f7567f7e
[INFO] running `"docker" "start" "-a" "828e4b52539c3b1e6d54a5e02c4be7aa7eb74c6e445f02ca0a669e02f7567f7e"`
[INFO] [stderr]    Compiling nix v0.5.1
[INFO] [stderr]    Compiling clap v2.31.1
[INFO] [stderr]    Compiling rustyline v1.0.0
[INFO] [stderr]    Compiling rs2048 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variant is never constructed: `Nothing`
[INFO] [stderr]   --> src/board.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Nothing,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Exist`
[INFO] [stderr]   --> src/board.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     Exist,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/board.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn new(score: usize, status: Status) -> Tile {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_score`
[INFO] [stderr]   --> src/board.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn get_score(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_exist`
[INFO] [stderr]   --> src/board.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     pub fn is_exist(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_nothing`
[INFO] [stderr]   --> src/board.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn is_nothing(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Board`
[INFO] [stderr]   --> src/board.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | pub struct Board {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/board.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 |     pub fn new() -> Board {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `gen`
[INFO] [stderr]   --> src/board.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub fn gen(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `color`
[INFO] [stderr]   --> src/board.rs:72:5
[INFO] [stderr]    |
[INFO] [stderr] 72 |     fn color(n: usize) -> Colour {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `format_line`
[INFO] [stderr]   --> src/board.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     fn format_line(&self, n: usize, t: Option<usize>) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `render`
[INFO] [stderr]    --> src/board.rs:118:5
[INFO] [stderr]     |
[INFO] [stderr] 118 |     pub fn render(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_tile`
[INFO] [stderr]    --> src/board.rs:171:5
[INFO] [stderr]     |
[INFO] [stderr] 171 |     pub fn get_tile(&self, n: usize) -> Option<&Tile> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_score`
[INFO] [stderr]    --> src/board.rs:178:5
[INFO] [stderr]     |
[INFO] [stderr] 178 |     fn get_score(&self) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sum_score`
[INFO] [stderr]    --> src/board.rs:182:5
[INFO] [stderr]     |
[INFO] [stderr] 182 |     fn sum_score(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `render_parameter_box`
[INFO] [stderr]    --> src/board.rs:191:5
[INFO] [stderr]     |
[INFO] [stderr] 191 |     pub fn render_parameter_box(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fin`
[INFO] [stderr]    --> src/board.rs:216:5
[INFO] [stderr]     |
[INFO] [stderr] 216 |     pub fn fin(&mut self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Update`
[INFO] [stderr]  --> src/app.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub struct Update();
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `update`
[INFO] [stderr]   --> src/app.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn update(board: &mut board::Board) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `up`
[INFO] [stderr]   --> src/app.rs:58:5
[INFO] [stderr]    |
[INFO] [stderr] 58 |     pub fn up(board: &mut board::Board) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `down`
[INFO] [stderr]   --> src/app.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     pub fn down(board: &mut board::Board) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `left`
[INFO] [stderr]    --> src/app.rs:120:5
[INFO] [stderr]     |
[INFO] [stderr] 120 |     pub fn left(board: &mut board::Board) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `right`
[INFO] [stderr]    --> src/app.rs:151:5
[INFO] [stderr]     |
[INFO] [stderr] 151 |     pub fn right(board: &mut board::Board) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_finished`
[INFO] [stderr]    --> src/app.rs:182:5
[INFO] [stderr]     |
[INFO] [stderr] 182 |     pub fn is_finished(board: &board::Board) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_nothing`
[INFO] [stderr]   --> src/board.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn is_nothing(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.87s
[INFO] running `"docker" "inspect" "828e4b52539c3b1e6d54a5e02c4be7aa7eb74c6e445f02ca0a669e02f7567f7e"`
[INFO] running `"docker" "rm" "-f" "828e4b52539c3b1e6d54a5e02c4be7aa7eb74c6e445f02ca0a669e02f7567f7e"`
[INFO] [stdout] 828e4b52539c3b1e6d54a5e02c4be7aa7eb74c6e445f02ca0a669e02f7567f7e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/shinkwhek/rs2048:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] f1d2882545b3ce54772d801e16429c538df2183ed84355e39f4fa7885e80c2f3
[INFO] running `"docker" "start" "-a" "f1d2882545b3ce54772d801e16429c538df2183ed84355e39f4fa7885e80c2f3"`
[INFO] [stderr]    Compiling rs2048 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variant is never constructed: `Nothing`
[INFO] [stderr]   --> src/board.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Nothing,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Exist`
[INFO] [stderr]   --> src/board.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     Exist,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/board.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn new(score: usize, status: Status) -> Tile {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_score`
[INFO] [stderr]   --> src/board.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn get_score(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_exist`
[INFO] [stderr]   --> src/board.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     pub fn is_exist(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_nothing`
[INFO] [stderr]   --> src/board.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn is_nothing(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Board`
[INFO] [stderr]   --> src/board.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | pub struct Board {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/board.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 |     pub fn new() -> Board {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `gen`
[INFO] [stderr]   --> src/board.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub fn gen(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `color`
[INFO] [stderr]   --> src/board.rs:72:5
[INFO] [stderr]    |
[INFO] [stderr] 72 |     fn color(n: usize) -> Colour {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `format_line`
[INFO] [stderr]   --> src/board.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     fn format_line(&self, n: usize, t: Option<usize>) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `render`
[INFO] [stderr]    --> src/board.rs:118:5
[INFO] [stderr]     |
[INFO] [stderr] 118 |     pub fn render(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_tile`
[INFO] [stderr]    --> src/board.rs:171:5
[INFO] [stderr]     |
[INFO] [stderr] 171 |     pub fn get_tile(&self, n: usize) -> Option<&Tile> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_score`
[INFO] [stderr]    --> src/board.rs:178:5
[INFO] [stderr]     |
[INFO] [stderr] 178 |     fn get_score(&self) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sum_score`
[INFO] [stderr]    --> src/board.rs:182:5
[INFO] [stderr]     |
[INFO] [stderr] 182 |     fn sum_score(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `render_parameter_box`
[INFO] [stderr]    --> src/board.rs:191:5
[INFO] [stderr]     |
[INFO] [stderr] 191 |     pub fn render_parameter_box(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fin`
[INFO] [stderr]    --> src/board.rs:216:5
[INFO] [stderr]     |
[INFO] [stderr] 216 |     pub fn fin(&mut self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Update`
[INFO] [stderr]  --> src/app.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub struct Update();
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `update`
[INFO] [stderr]   --> src/app.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn update(board: &mut board::Board) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `up`
[INFO] [stderr]   --> src/app.rs:58:5
[INFO] [stderr]    |
[INFO] [stderr] 58 |     pub fn up(board: &mut board::Board) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `down`
[INFO] [stderr]   --> src/app.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     pub fn down(board: &mut board::Board) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `left`
[INFO] [stderr]    --> src/app.rs:120:5
[INFO] [stderr]     |
[INFO] [stderr] 120 |     pub fn left(board: &mut board::Board) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `right`
[INFO] [stderr]    --> src/app.rs:151:5
[INFO] [stderr]     |
[INFO] [stderr] 151 |     pub fn right(board: &mut board::Board) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_finished`
[INFO] [stderr]    --> src/app.rs:182:5
[INFO] [stderr]     |
[INFO] [stderr] 182 |     pub fn is_finished(board: &board::Board) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_nothing`
[INFO] [stderr]   --> src/board.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn is_nothing(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.26s
[INFO] running `"docker" "inspect" "f1d2882545b3ce54772d801e16429c538df2183ed84355e39f4fa7885e80c2f3"`
[INFO] running `"docker" "rm" "-f" "f1d2882545b3ce54772d801e16429c538df2183ed84355e39f4fa7885e80c2f3"`
[INFO] [stdout] f1d2882545b3ce54772d801e16429c538df2183ed84355e39f4fa7885e80c2f3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/shinkwhek/rs2048:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] ba55576b5db2d8320aa36322a10490f3309df2c91ba5bc49c376bf68a5fa5c9c
[INFO] running `"docker" "start" "-a" "ba55576b5db2d8320aa36322a10490f3309df2c91ba5bc49c376bf68a5fa5c9c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rs2048-e4dd73c3394b5217
[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
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rs2048-3ed59a050d51d236
[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
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rs2048
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "ba55576b5db2d8320aa36322a10490f3309df2c91ba5bc49c376bf68a5fa5c9c"`
[INFO] running `"docker" "rm" "-f" "ba55576b5db2d8320aa36322a10490f3309df2c91ba5bc49c376bf68a5fa5c9c"`
[INFO] [stdout] ba55576b5db2d8320aa36322a10490f3309df2c91ba5bc49c376bf68a5fa5c9c