[INFO] cloning repository https://github.com/dl-watson/rust_islands
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dl-watson/rust_islands" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdl-watson%2Frust_islands", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdl-watson%2Frust_islands'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 16ae35dd92135f740bc1ee1f40378ce3d339cd87
[INFO] testing dl-watson/rust_islands against try#ce59db7a1b1b012fb2793c4641c1bdecad7a128b for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdl-watson%2Frust_islands" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dl-watson/rust_islands on toolchain ce59db7a1b1b012fb2793c4641c1bdecad7a128b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dl-watson/rust_islands
[INFO] finished tweaking git repo https://github.com/dl-watson/rust_islands
[INFO] tweaked toml for git repo https://github.com/dl-watson/rust_islands written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/dl-watson/rust_islands already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 476853c16463b4de3688bc5c2e82608273822e820d6c93cc70e8e92eb0f0d531
[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" "476853c16463b4de3688bc5c2e82608273822e820d6c93cc70e8e92eb0f0d531", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "476853c16463b4de3688bc5c2e82608273822e820d6c93cc70e8e92eb0f0d531", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "476853c16463b4de3688bc5c2e82608273822e820d6c93cc70e8e92eb0f0d531", kill_on_drop: false }`
[INFO] [stdout] 476853c16463b4de3688bc5c2e82608273822e820d6c93cc70e8e92eb0f0d531
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 90cc8a51ddb3eb65f0cae936b5f87191da8a0fcd420a0bd88458b78391bf280c
[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" "90cc8a51ddb3eb65f0cae936b5f87191da8a0fcd420a0bd88458b78391bf280c", kill_on_drop: false }`
[INFO] [stderr]    Compiling islands v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct is never constructed: `SafeDisjointSet`
[INFO] [stdout]   --> src/disjoint.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 97 | pub struct SafeDisjointSet(DisjointSet);
[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/disjoint.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn new(size: usize) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `find`
[INFO] [stdout]    --> src/disjoint.rs:104:12
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub fn find(&self, key: i32) -> Option<i32> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.06s
[INFO] running `Command { std: "docker" "inspect" "90cc8a51ddb3eb65f0cae936b5f87191da8a0fcd420a0bd88458b78391bf280c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90cc8a51ddb3eb65f0cae936b5f87191da8a0fcd420a0bd88458b78391bf280c", kill_on_drop: false }`
[INFO] [stdout] 90cc8a51ddb3eb65f0cae936b5f87191da8a0fcd420a0bd88458b78391bf280c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 027baf41794c023af8380d86bc625df0bde0ef6179260d86a51660241a29890d
[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" "027baf41794c023af8380d86bc625df0bde0ef6179260d86a51660241a29890d", kill_on_drop: false }`
[INFO] [stderr]    Compiling islands v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct is never constructed: `SafeDisjointSet`
[INFO] [stdout]   --> src/disjoint.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 97 | pub struct SafeDisjointSet(DisjointSet);
[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/disjoint.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn new(size: usize) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `find`
[INFO] [stdout]    --> src/disjoint.rs:104:12
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub fn find(&self, key: i32) -> Option<i32> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.25s
[INFO] running `Command { std: "docker" "inspect" "027baf41794c023af8380d86bc625df0bde0ef6179260d86a51660241a29890d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "027baf41794c023af8380d86bc625df0bde0ef6179260d86a51660241a29890d", kill_on_drop: false }`
[INFO] [stdout] 027baf41794c023af8380d86bc625df0bde0ef6179260d86a51660241a29890d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2472aa12d43a56697bcb36e7f4dcfb662dd431f792cc7f6fa9af022fc38308d7
[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" "2472aa12d43a56697bcb36e7f4dcfb662dd431f792cc7f6fa9af022fc38308d7", kill_on_drop: false }`
[INFO] [stderr] warning: struct is never constructed: `SafeDisjointSet`
[INFO] [stderr]   --> src/disjoint.rs:97:12
[INFO] [stderr]    |
[INFO] [stderr] 97 | pub struct SafeDisjointSet(DisjointSet);
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/disjoint.rs:100:12
[INFO] [stderr]     |
[INFO] [stderr] 100 |     pub fn new(size: usize) -> Self {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `find`
[INFO] [stderr]    --> src/disjoint.rs:104:12
[INFO] [stderr]     |
[INFO] [stderr] 104 |     pub fn find(&self, key: i32) -> Option<i32> {
[INFO] [stderr]     |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/islands-d61b2a2acc49d30a)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test disjoint::tests::find ... ok
[INFO] [stdout] test disjoint::tests::neither_are_identifier ... ok
[INFO] [stdout] test disjoint::tests::num_are_own_identifier ... ok
[INFO] [stdout] test disjoint::tests::union ... ok
[INFO] [stdout] test disjoint::tests::one_isnt_an_identifier ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2472aa12d43a56697bcb36e7f4dcfb662dd431f792cc7f6fa9af022fc38308d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2472aa12d43a56697bcb36e7f4dcfb662dd431f792cc7f6fa9af022fc38308d7", kill_on_drop: false }`
[INFO] [stdout] 2472aa12d43a56697bcb36e7f4dcfb662dd431f792cc7f6fa9af022fc38308d7