[INFO] updating cached repository Borthralla/2048
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Borthralla/2048
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Borthralla/2048" "work/ex/beta-1.38-1/sources/1.37.0/gh/Borthralla/2048"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Borthralla/2048'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Borthralla/2048" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Borthralla/2048"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Borthralla/2048'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4b777c33aced36d1cd46f3473a1998b9f82c17b1
[INFO] sha for GitHub repo Borthralla/2048: 4b777c33aced36d1cd46f3473a1998b9f82c17b1
[INFO] validating manifest of Borthralla/2048 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Borthralla/2048 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Borthralla/2048
[INFO] finished frobbing Borthralla/2048
[INFO] frobbed toml for Borthralla/2048 written to work/ex/beta-1.38-1/sources/1.37.0/gh/Borthralla/2048/Cargo.toml
[INFO] started frobbing Borthralla/2048
[INFO] finished frobbing Borthralla/2048
[INFO] frobbed toml for Borthralla/2048 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Borthralla/2048/Cargo.toml
[INFO] crate Borthralla/2048 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Borthralla/2048 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Borthralla/2048:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 0c4b07365eee6b78dfe0f9402f834eec00d9f3eeb0ae47f3e3fb73068457a5c2
[INFO] running `"docker" "start" "-a" "0c4b07365eee6b78dfe0f9402f834eec00d9f3eeb0ae47f3e3fb73068457a5c2"`
[INFO] [stderr]    Compiling play_2048 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Duration`
[INFO] [stderr]  --> src/main.rs:4:17
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::time::{Duration, Instant};
[INFO] [stderr]   |                 ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/main.rs:106:7
[INFO] [stderr]     |
[INFO] [stderr] 106 |             if (*val != 0u8) {
[INFO] [stderr]     |                ^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `while` condition
[INFO] [stderr]    --> src/main.rs:160:8
[INFO] [stderr]     |
[INFO] [stderr] 160 |         while(next_states.len() > 0) {
[INFO] [stderr]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `while` condition
[INFO] [stderr]    --> src/main.rs:204:8
[INFO] [stderr]     |
[INFO] [stderr] 204 |         while(next_states.len() > 0) {
[INFO] [stderr]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `while` condition
[INFO] [stderr]    --> src/main.rs:214:8
[INFO] [stderr]     |
[INFO] [stderr] 214 |         while(next_states.len() > 0) {
[INFO] [stderr]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/main.rs:231:8
[INFO] [stderr]     |
[INFO] [stderr] 231 |                 if (val != 0) {
[INFO] [stderr]     |                    ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `average_score`
[INFO] [stderr]    --> src/main.rs:113:2
[INFO] [stderr]     |
[INFO] [stderr] 113 |     fn average_score(&self, iterations: i32) -> i32 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `make_best_move`
[INFO] [stderr]    --> src/main.rs:140:2
[INFO] [stderr]     |
[INFO] [stderr] 140 |     fn make_best_move(&mut self, iterations: i32, next_states: Vec<State>) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `play_best_game`
[INFO] [stderr]    --> src/main.rs:158:2
[INFO] [stderr]     |
[INFO] [stderr] 158 |     fn play_best_game(&mut self, iterations: i32) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parallel_timed_make_best_move`
[INFO] [stderr]    --> src/main.rs:181:2
[INFO] [stderr]     |
[INFO] [stderr] 181 |     fn parallel_timed_make_best_move(&mut self, duration: i32, next_states: Vec<State>, num_threads: usize) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parallel_timed_play_best_game`
[INFO] [stderr]    --> src/main.rs:212:2
[INFO] [stderr]     |
[INFO] [stderr] 212 |     fn parallel_timed_play_best_game(&mut self, duration: i32, num_threads: usize) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:253:6
[INFO] [stderr]     |
[INFO] [stderr] 253 |         writeln!(file, "{}", my_state);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.30s
[INFO] running `"docker" "inspect" "0c4b07365eee6b78dfe0f9402f834eec00d9f3eeb0ae47f3e3fb73068457a5c2"`
[INFO] running `"docker" "rm" "-f" "0c4b07365eee6b78dfe0f9402f834eec00d9f3eeb0ae47f3e3fb73068457a5c2"`
[INFO] [stdout] 0c4b07365eee6b78dfe0f9402f834eec00d9f3eeb0ae47f3e3fb73068457a5c2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Borthralla/2048:/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] fecbc7055d19db9d80cd60320d9a5ff05ef6b33c9d7a9e5fa7be8d4fcca5626f
[INFO] running `"docker" "start" "-a" "fecbc7055d19db9d80cd60320d9a5ff05ef6b33c9d7a9e5fa7be8d4fcca5626f"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling play_2048 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Duration`
[INFO] [stderr]  --> src/main.rs:4:17
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::time::{Duration, Instant};
[INFO] [stderr]   |                 ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/main.rs:106:7
[INFO] [stderr]     |
[INFO] [stderr] 106 |             if (*val != 0u8) {
[INFO] [stderr]     |                ^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `while` condition
[INFO] [stderr]    --> src/main.rs:160:8
[INFO] [stderr]     |
[INFO] [stderr] 160 |         while(next_states.len() > 0) {
[INFO] [stderr]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `while` condition
[INFO] [stderr]    --> src/main.rs:204:8
[INFO] [stderr]     |
[INFO] [stderr] 204 |         while(next_states.len() > 0) {
[INFO] [stderr]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `while` condition
[INFO] [stderr]    --> src/main.rs:214:8
[INFO] [stderr]     |
[INFO] [stderr] 214 |         while(next_states.len() > 0) {
[INFO] [stderr]     |              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/main.rs:231:8
[INFO] [stderr]     |
[INFO] [stderr] 231 |                 if (val != 0) {
[INFO] [stderr]     |                    ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `average_score`
[INFO] [stderr]    --> src/main.rs:113:2
[INFO] [stderr]     |
[INFO] [stderr] 113 |     fn average_score(&self, iterations: i32) -> i32 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `make_best_move`
[INFO] [stderr]    --> src/main.rs:140:2
[INFO] [stderr]     |
[INFO] [stderr] 140 |     fn make_best_move(&mut self, iterations: i32, next_states: Vec<State>) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `play_best_game`
[INFO] [stderr]    --> src/main.rs:158:2
[INFO] [stderr]     |
[INFO] [stderr] 158 |     fn play_best_game(&mut self, iterations: i32) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parallel_timed_make_best_move`
[INFO] [stderr]    --> src/main.rs:181:2
[INFO] [stderr]     |
[INFO] [stderr] 181 |     fn parallel_timed_make_best_move(&mut self, duration: i32, next_states: Vec<State>, num_threads: usize) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parallel_timed_play_best_game`
[INFO] [stderr]    --> src/main.rs:212:2
[INFO] [stderr]     |
[INFO] [stderr] 212 |     fn parallel_timed_play_best_game(&mut self, duration: i32, num_threads: usize) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:253:6
[INFO] [stderr]     |
[INFO] [stderr] 253 |         writeln!(file, "{}", my_state);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `"docker" "inspect" "fecbc7055d19db9d80cd60320d9a5ff05ef6b33c9d7a9e5fa7be8d4fcca5626f"`
[INFO] running `"docker" "rm" "-f" "fecbc7055d19db9d80cd60320d9a5ff05ef6b33c9d7a9e5fa7be8d4fcca5626f"`
[INFO] [stdout] fecbc7055d19db9d80cd60320d9a5ff05ef6b33c9d7a9e5fa7be8d4fcca5626f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Borthralla/2048:/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 5ac304c676d2a81fdcce76a601812596d1e77771a1095815b35c4696a8c86af7
[INFO] running `"docker" "start" "-a" "5ac304c676d2a81fdcce76a601812596d1e77771a1095815b35c4696a8c86af7"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/play_2048-906ea82c30bb0d20
[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" "5ac304c676d2a81fdcce76a601812596d1e77771a1095815b35c4696a8c86af7"`
[INFO] running `"docker" "rm" "-f" "5ac304c676d2a81fdcce76a601812596d1e77771a1095815b35c4696a8c86af7"`
[INFO] [stdout] 5ac304c676d2a81fdcce76a601812596d1e77771a1095815b35c4696a8c86af7