[INFO] cloning repository https://github.com/JoshuaRadin37/sudoku
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JoshuaRadin37/sudoku" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshuaRadin37%2Fsudoku", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshuaRadin37%2Fsudoku'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ab48534fd965ac293af7e19ab94618525193cbb5
[INFO] checking JoshuaRadin37/sudoku against master#1ab98933fa75d72e882b86feac1a0be3a5b02cb0 for pr-83850
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshuaRadin37%2Fsudoku" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JoshuaRadin37/sudoku on toolchain 1ab98933fa75d72e882b86feac1a0be3a5b02cb0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1ab98933fa75d72e882b86feac1a0be3a5b02cb0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JoshuaRadin37/sudoku
[INFO] finished tweaking git repo https://github.com/JoshuaRadin37/sudoku
[INFO] tweaked toml for git repo https://github.com/JoshuaRadin37/sudoku written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/JoshuaRadin37/sudoku already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1ab98933fa75d72e882b86feac1a0be3a5b02cb0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+1ab98933fa75d72e882b86feac1a0be3a5b02cb0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 041dcb719855792decca90487a5655e478fcdb69c86a7496d8aed68ebdfd4c60
[INFO] running `Command { std: "docker" "start" "-a" "041dcb719855792decca90487a5655e478fcdb69c86a7496d8aed68ebdfd4c60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "041dcb719855792decca90487a5655e478fcdb69c86a7496d8aed68ebdfd4c60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "041dcb719855792decca90487a5655e478fcdb69c86a7496d8aed68ebdfd4c60", kill_on_drop: false }`
[INFO] [stdout] 041dcb719855792decca90487a5655e478fcdb69c86a7496d8aed68ebdfd4c60
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+1ab98933fa75d72e882b86feac1a0be3a5b02cb0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0d147879b724ed30454160ad51861ef7d52783545098cbb923b148e40d06a73e
[INFO] running `Command { std: "docker" "start" "-a" "0d147879b724ed30454160ad51861ef7d52783545098cbb923b148e40d06a73e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling autocfg v1.0.1
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[INFO] [stderr]     Checking piston-float v1.0.0
[INFO] [stderr]     Checking cfg-if v0.1.10
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[INFO] [stderr]    Compiling num-traits v0.2.14
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[INFO] [stderr]    Compiling num-rational v0.3.2
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[INFO] [stderr]    Compiling x11-dl v2.18.5
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[INFO] [stderr]     Checking dlib v0.4.2
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[INFO] [stderr]    Compiling gl_generator v0.13.1
[INFO] [stderr]     Checking rusttype v0.9.2
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking andrew v0.3.1
[INFO] [stderr]     Checking piston2d-graphics v0.40.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling wayland-scanner v0.28.6
[INFO] [stderr]    Compiling glutin_egl_sys v0.1.5
[INFO] [stderr]    Compiling glutin_glx_sys v0.1.7
[INFO] [stderr]    Compiling gl v0.13.0
[INFO] [stderr]     Checking nix v0.20.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking iovec v0.1.4
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[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]    Compiling wayland-client v0.28.6
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[INFO] [stderr]     Checking jpeg-decoder v0.1.22
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[INFO] [stderr]     Checking wayland-egl v0.28.6
[INFO] [stderr]     Checking piston2d-opengl_graphics v0.78.0
[INFO] [stderr]     Checking smithay-client-toolkit v0.12.3
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[INFO] [stderr]     Checking pistoncore-input v1.0.0
[INFO] [stderr]     Checking pistoncore-window v0.47.0
[INFO] [stderr]     Checking pistoncore-event_loop v0.53.0
[INFO] [stderr]     Checking pistoncore-glutin_window v0.69.0
[INFO] [stderr]     Checking piston v0.53.0
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> src/game_creator/random_create_game.rs:5:26
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::time::{Instant, Duration};
[INFO] [stdout]   |                          ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::advanced_solver::Solver`
[INFO] [stdout]   --> src/game_creator/random_create_game.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use crate::advanced_solver::Solver;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> src/game_creator/random_create_game.rs:5:26
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::time::{Instant, Duration};
[INFO] [stdout]   |                          ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::advanced_solver::Solver`
[INFO] [stdout]   --> src/game_creator/random_create_game.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use crate::advanced_solver::Solver;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `game_board`
[INFO] [stdout]   --> src/advanced_solver/techniques/hidden_pair.rs:14:24
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn apply_to(&self, game_board: &GameBoard) -> Result<GameBoard, ()> {
[INFO] [stdout]    |                        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_game_board`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `solution`
[INFO] [stdout]    --> src/game_creator/random_create_game.rs:216:13
[INFO] [stdout]     |
[INFO] [stdout] 216 |         let solution = game_board.clone();
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_solution`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `game_board`
[INFO] [stdout]   --> src/advanced_solver/techniques/hidden_pair.rs:14:24
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn apply_to(&self, game_board: &GameBoard) -> Result<GameBoard, ()> {
[INFO] [stdout]    |                        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_game_board`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `solution`
[INFO] [stdout]    --> src/game_creator/random_create_game.rs:216:13
[INFO] [stdout]     |
[INFO] [stdout] 216 |         let solution = game_board.clone();
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_solution`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_from_vec`
[INFO] [stdout]   --> src/game_creator/random_create_game.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn take_from_vec<T, R : Rng>(vector: &mut Vec<T>, rng: &mut R) -> Option<T> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_from_vec`
[INFO] [stdout]   --> src/game_creator/random_create_game.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn take_from_vec<T, R : Rng>(vector: &mut Vec<T>, rng: &mut R) -> Option<T> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 57.45s
[INFO] running `Command { std: "docker" "inspect" "0d147879b724ed30454160ad51861ef7d52783545098cbb923b148e40d06a73e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d147879b724ed30454160ad51861ef7d52783545098cbb923b148e40d06a73e", kill_on_drop: false }`
[INFO] [stdout] 0d147879b724ed30454160ad51861ef7d52783545098cbb923b148e40d06a73e