[INFO] cloning repository https://github.com/ErikPartridge/sudoku-generator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ErikPartridge/sudoku-generator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FErikPartridge%2Fsudoku-generator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FErikPartridge%2Fsudoku-generator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] abf3fb1b85c4b234c8d333af646357ec631d53d2
[INFO] checking ErikPartridge/sudoku-generator against master#0d37dca25a51fb900a402c94c8818ad1c2789e30 for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FErikPartridge%2Fsudoku-generator" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ErikPartridge/sudoku-generator on toolchain 0d37dca25a51fb900a402c94c8818ad1c2789e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ErikPartridge/sudoku-generator
[INFO] finished tweaking git repo https://github.com/ErikPartridge/sudoku-generator
[INFO] tweaked toml for git repo https://github.com/ErikPartridge/sudoku-generator written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/ErikPartridge/sudoku-generator already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 79aaec475843f3156f42a3f965113165d606ce61499cfb65c2a100c2c2af1c9f
[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" "79aaec475843f3156f42a3f965113165d606ce61499cfb65c2a100c2c2af1c9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "79aaec475843f3156f42a3f965113165d606ce61499cfb65c2a100c2c2af1c9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79aaec475843f3156f42a3f965113165d606ce61499cfb65c2a100c2c2af1c9f", kill_on_drop: false }`
[INFO] [stdout] 79aaec475843f3156f42a3f965113165d606ce61499cfb65c2a100c2c2af1c9f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9e53fdaa4418660991ab8f504e4603ec3f956777ba9c60c506e6b3f369e486dd
[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" "9e53fdaa4418660991ab8f504e4603ec3f956777ba9c60c506e6b3f369e486dd", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.2.1
[INFO] [stderr]     Checking rand v0.5.5
[INFO] [stderr]     Checking sudoku-generator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `freedom::Freedom`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use freedom::Freedom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `problem::Problem`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use problem::Problem;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `freedom::Freedom`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use freedom::Freedom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `problem::Problem`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use problem::Problem;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/freedom.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     for j in 0..3 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/freedom.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     for j in 0..3 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ORDER`
[INFO] [stdout]  --> src/freedom.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | const ORDER: u8 = 3;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `DIM`
[INFO] [stdout]  --> src/freedom.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | const DIM: u8 = ORDER * ORDER;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ELEMENTS`
[INFO] [stdout]  --> src/freedom.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const ELEMENTS: u8 = DIM * DIM;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ALL_VALUES`
[INFO] [stdout]  --> src/freedom.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | const ALL_VALUES: u16 = (1 << DIM) - 1;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Freedom`
[INFO] [stdout]  --> src/freedom.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct Freedom {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ORDER`
[INFO] [stdout]  --> src/freedom.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | const ORDER: u8 = 3;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `singleton`
[INFO] [stdout]   --> src/freedom.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn singleton(v: u16) -> u16 {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `DIM`
[INFO] [stdout]  --> src/freedom.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | const DIM: u8 = ORDER * ORDER;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ELEMENTS`
[INFO] [stdout]  --> src/freedom.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const ELEMENTS: u8 = DIM * DIM;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ALL_VALUES`
[INFO] [stdout]  --> src/freedom.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | const ALL_VALUES: u16 = (1 << DIM) - 1;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `freedom_eliminate`
[INFO] [stdout]   --> src/freedom.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn freedom_eliminate(f: &Freedom, col: u16, row: u16, value: u16) -> Freedom {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Freedom`
[INFO] [stdout]  --> src/freedom.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct Freedom {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `singleton`
[INFO] [stdout]   --> src/freedom.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn singleton(v: u16) -> u16 {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `freedom_eliminate`
[INFO] [stdout]   --> src/freedom.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn freedom_eliminate(f: &Freedom, col: u16, row: u16, value: u16) -> Freedom {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_freedom`
[INFO] [stdout]   --> src/freedom.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn create_freedom(problem: &Problem) -> Freedom {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sanity_check`
[INFO] [stdout]   --> src/freedom.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn sanity_check(problem: &Problem, freedom: &Freedom) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search_least_free`
[INFO] [stdout]   --> src/freedom.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn search_least_free(problem: &Problem, freedom: &Freedom) -> u16 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Problem`
[INFO] [stdout]  --> src/problem.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Problem {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_freedom`
[INFO] [stdout]   --> src/freedom.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn create_freedom(problem: &Problem) -> Freedom {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sanity_check`
[INFO] [stdout]   --> src/freedom.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn sanity_check(problem: &Problem, freedom: &Freedom) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search_least_free`
[INFO] [stdout]   --> src/freedom.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn search_least_free(problem: &Problem, freedom: &Freedom) -> u16 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Problem`
[INFO] [stdout]  --> src/problem.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Problem {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.48s
[INFO] running `Command { std: "docker" "inspect" "9e53fdaa4418660991ab8f504e4603ec3f956777ba9c60c506e6b3f369e486dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e53fdaa4418660991ab8f504e4603ec3f956777ba9c60c506e6b3f369e486dd", kill_on_drop: false }`
[INFO] [stdout] 9e53fdaa4418660991ab8f504e4603ec3f956777ba9c60c506e6b3f369e486dd