[INFO] cloning repository https://github.com/stevenleadbeater/union-find-exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/stevenleadbeater/union-find-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevenleadbeater%2Funion-find-exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevenleadbeater%2Funion-find-exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6e4d9721b4c8f9d4cb24113a8affd9ed3976decd
[INFO] checking stevenleadbeater/union-find-exercises against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevenleadbeater%2Funion-find-exercises" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/stevenleadbeater/union-find-exercises on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/stevenleadbeater/union-find-exercises
[INFO] finished tweaking git repo https://github.com/stevenleadbeater/union-find-exercises
[INFO] tweaked toml for git repo https://github.com/stevenleadbeater/union-find-exercises written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/stevenleadbeater/union-find-exercises already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2b7cd53a74c3e3fe2e42eb8cdd4034593cd6767ad75656c261d97a13a5b3430d
[INFO] running `Command { std: "docker" "start" "-a" "2b7cd53a74c3e3fe2e42eb8cdd4034593cd6767ad75656c261d97a13a5b3430d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b7cd53a74c3e3fe2e42eb8cdd4034593cd6767ad75656c261d97a13a5b3430d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b7cd53a74c3e3fe2e42eb8cdd4034593cd6767ad75656c261d97a13a5b3430d", kill_on_drop: false }`
[INFO] [stdout] 2b7cd53a74c3e3fe2e42eb8cdd4034593cd6767ad75656c261d97a13a5b3430d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ef0fea3d7a65130e6d53431f999d4fc1af77b2e32531c2bbb8b42df262cf6ab
[INFO] running `Command { std: "docker" "start" "-a" "2ef0fea3d7a65130e6d53431f999d4fc1af77b2e32531c2bbb8b42df262cf6ab", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking Data_Structures_and_Algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct is never constructed: `QuickFind`
[INFO] [stdout]  --> src/quick_find.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct QuickFind {
[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: `new`
[INFO] [stdout]  --> src/quick_find.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn new(size: i64) -> QuickFind {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `union`
[INFO] [stdout]   --> src/quick_find.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn union(&mut self, start: i64, end: i64) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `connected`
[INFO] [stdout]   --> src/quick_find.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn connected(&self, start: i64, end: i64) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `QuickUnion`
[INFO] [stdout]  --> src/quick_union.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct QuickUnion {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/quick_union.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn new(size: i64) -> QuickUnion {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `union`
[INFO] [stdout]   --> src/quick_union.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn union(&mut self, start: i64, end: i64) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `connected`
[INFO] [stdout]   --> src/quick_union.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn connected(&self, start: i64, end: i64) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_root`
[INFO] [stdout]   --> src/quick_union.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn get_root(&self, item: i64) -> i64 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `WeightedQuickUnion`
[INFO] [stdout]  --> src/weighted_quick_union.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct WeightedQuickUnion {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/weighted_quick_union.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn new(size: i64) -> WeightedQuickUnion {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `union`
[INFO] [stdout]   --> src/weighted_quick_union.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn union(&mut self, start: i64, end: i64) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `connected`
[INFO] [stdout]   --> src/weighted_quick_union.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn connected(&self, start: i64, end: i64) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_root`
[INFO] [stdout]   --> src/weighted_quick_union.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn get_root(&self, item: i64) -> i64 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `WeightedQuickUnionPathCompression`
[INFO] [stdout]  --> src/weighted_quick_union_path_compression.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct WeightedQuickUnionPathCompression {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/weighted_quick_union_path_compression.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn new(size: i64) -> WeightedQuickUnionPathCompression {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `union`
[INFO] [stdout]   --> src/weighted_quick_union_path_compression.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn union(&mut self, start: i64, end: i64) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `connected`
[INFO] [stdout]   --> src/weighted_quick_union_path_compression.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn connected(&mut self, start: i64, end: i64) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_root`
[INFO] [stdout]   --> src/weighted_quick_union_path_compression.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn get_root(&mut self, item: i64) -> i64 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Percolation`
[INFO] [stdout]  --> src/percolation.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Percolation {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/percolation.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn new(size: i64) -> Percolation {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `union`
[INFO] [stdout]   --> src/percolation.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn union(&mut self, start: (i64, i64), end: (i64, i64)) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `connected`
[INFO] [stdout]   --> src/percolation.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 |     fn connected(&mut self, start: (i64, i64), end: (i64, i64)) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_root`
[INFO] [stdout]   --> src/percolation.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 56 |     fn get_root(&mut self, item: (i64, i64)) -> (i64, i64) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `percolates`
[INFO] [stdout]   --> src/percolation.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn percolates(&mut self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `Data_Structures_and_Algorithms` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `data_structures_and_algorithms`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `Data_Structures_and_Algorithms` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `data_structures_and_algorithms`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
[INFO] running `Command { std: "docker" "inspect" "2ef0fea3d7a65130e6d53431f999d4fc1af77b2e32531c2bbb8b42df262cf6ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ef0fea3d7a65130e6d53431f999d4fc1af77b2e32531c2bbb8b42df262cf6ab", kill_on_drop: false }`
[INFO] [stdout] 2ef0fea3d7a65130e6d53431f999d4fc1af77b2e32531c2bbb8b42df262cf6ab