[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#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevenleadbeater%2Funion-find-exercises" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[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-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/stevenleadbeater/union-find-exercises on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/stevenleadbeater/union-find-exercises already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd2358bb75ed034aa4fbb18a5bc329edb1f84718cb3d21f52f0fe90cd6237904
[INFO] running `Command { std: "docker" "start" "-a" "bd2358bb75ed034aa4fbb18a5bc329edb1f84718cb3d21f52f0fe90cd6237904", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd2358bb75ed034aa4fbb18a5bc329edb1f84718cb3d21f52f0fe90cd6237904", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd2358bb75ed034aa4fbb18a5bc329edb1f84718cb3d21f52f0fe90cd6237904", kill_on_drop: false }`
[INFO] [stdout] bd2358bb75ed034aa4fbb18a5bc329edb1f84718cb3d21f52f0fe90cd6237904
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2f607e481cef1655f31d7959b96c60d013e8b4a1bb2e9de60c30fc2cb8d1c1d9
[INFO] running `Command { std: "docker" "start" "-a" "2f607e481cef1655f31d7959b96c60d013e8b4a1bb2e9de60c30fc2cb8d1c1d9", kill_on_drop: false }`
[INFO] [stderr]     Checking Data_Structures_and_Algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `QuickFind` is never constructed
[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 items `new`, `union`, and `connected` are never used
[INFO] [stdout]   --> src/quick_find.rs:6:8
[INFO] [stdout]    |
[INFO] [stdout]  5 | impl QuickFind {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout]  6 |     fn new(size: i64) -> QuickFind {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 10 |     fn union(&mut self, start: i64, end: i64) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn connected(&self, start: i64, end: i64) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `QuickUnion` is never constructed
[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 items `new`, `union`, `connected`, and `get_root` are never used
[INFO] [stdout]   --> src/quick_union.rs:6:8
[INFO] [stdout]    |
[INFO] [stdout]  5 | impl QuickUnion {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout]  6 |     fn new(size: i64) -> QuickUnion {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn union(&mut self, start: i64, end: i64) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     fn connected(&self, start: i64, end: i64) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     fn get_root(&self, item: i64) -> i64 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WeightedQuickUnion` is never constructed
[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 items `new`, `union`, `connected`, and `get_root` are never used
[INFO] [stdout]   --> src/weighted_quick_union.rs:7:8
[INFO] [stdout]    |
[INFO] [stdout]  6 | impl WeightedQuickUnion {
[INFO] [stdout]    | ----------------------- associated items in this implementation
[INFO] [stdout]  7 |     fn new(size: i64) -> WeightedQuickUnion {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 |     fn union(&mut self, start: i64, end: i64) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn connected(&self, start: i64, end: i64) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn get_root(&self, item: i64) -> i64 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WeightedQuickUnionPathCompression` is never constructed
[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 items `new`, `union`, `connected`, and `get_root` are never used
[INFO] [stdout]   --> src/weighted_quick_union_path_compression.rs:7:8
[INFO] [stdout]    |
[INFO] [stdout]  6 | impl WeightedQuickUnionPathCompression {
[INFO] [stdout]    | -------------------------------------- associated items in this implementation
[INFO] [stdout]  7 |     fn new(size: i64) -> WeightedQuickUnionPathCompression {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 |     fn union(&mut self, start: i64, end: i64) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn connected(&mut self, start: i64, end: i64) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn get_root(&mut self, item: i64) -> i64 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Percolation` is never constructed
[INFO] [stdout]  --> src/percolation.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Percolation {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `union`, `connected`, `get_root`, and `percolates` are never used
[INFO] [stdout]   --> src/percolation.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout]  7 | impl Percolation {
[INFO] [stdout]    | ---------------- associated items in this implementation
[INFO] [stdout]  8 |     fn new(size: i64) -> Percolation {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     fn union(&mut self, start: (i64, i64), end: (i64, i64)) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     fn connected(&mut self, start: (i64, i64), end: (i64, i64)) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 56 |     fn get_root(&mut self, item: (i64, i64)) -> (i64, i64) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 69 |     fn percolates(&mut self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.32s
[INFO] running `Command { std: "docker" "inspect" "2f607e481cef1655f31d7959b96c60d013e8b4a1bb2e9de60c30fc2cb8d1c1d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f607e481cef1655f31d7959b96c60d013e8b4a1bb2e9de60c30fc2cb8d1c1d9", kill_on_drop: false }`
[INFO] [stdout] 2f607e481cef1655f31d7959b96c60d013e8b4a1bb2e9de60c30fc2cb8d1c1d9