[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 beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdl-watson%2Frust_islands" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dl-watson/rust_islands on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-13/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" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d18f5aeacd385f1409578d50c7d2577d6a1af578b9b25f9683df1f813268c066
[INFO] running `Command { std: "docker" "start" "-a" "d18f5aeacd385f1409578d50c7d2577d6a1af578b9b25f9683df1f813268c066", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d18f5aeacd385f1409578d50c7d2577d6a1af578b9b25f9683df1f813268c066", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d18f5aeacd385f1409578d50c7d2577d6a1af578b9b25f9683df1f813268c066", kill_on_drop: false }`
[INFO] [stdout] d18f5aeacd385f1409578d50c7d2577d6a1af578b9b25f9683df1f813268c066
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8ce63f65a681c0059e21abdf7df2130ce121d84f9b3c8225aa5ade292f208d26
[INFO] running `Command { std: "docker" "start" "-a" "8ce63f65a681c0059e21abdf7df2130ce121d84f9b3c8225aa5ade292f208d26", 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 1.15s
[INFO] running `Command { std: "docker" "inspect" "8ce63f65a681c0059e21abdf7df2130ce121d84f9b3c8225aa5ade292f208d26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ce63f65a681c0059e21abdf7df2130ce121d84f9b3c8225aa5ade292f208d26", kill_on_drop: false }`
[INFO] [stdout] 8ce63f65a681c0059e21abdf7df2130ce121d84f9b3c8225aa5ade292f208d26
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 78d2f52ad3debc100b51cc97d70403a1cfcc7c3c135be8f441bdcb9c8c413d43
[INFO] running `Command { std: "docker" "start" "-a" "78d2f52ad3debc100b51cc97d70403a1cfcc7c3c135be8f441bdcb9c8c413d43", 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 0.89s
[INFO] running `Command { std: "docker" "inspect" "78d2f52ad3debc100b51cc97d70403a1cfcc7c3c135be8f441bdcb9c8c413d43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78d2f52ad3debc100b51cc97d70403a1cfcc7c3c135be8f441bdcb9c8c413d43", kill_on_drop: false }`
[INFO] [stdout] 78d2f52ad3debc100b51cc97d70403a1cfcc7c3c135be8f441bdcb9c8c413d43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 54092ba7fc077d5ac21806b2cc1bf6b03b932c67327485799be42600c1a258a0
[INFO] running `Command { std: "docker" "start" "-a" "54092ba7fc077d5ac21806b2cc1bf6b03b932c67327485799be42600c1a258a0", 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: `islands` (bin "islands" test) generated 3 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/islands-76b2c6f566de049b)
[INFO] [stdout] running 5 tests
[INFO] [stdout] test disjoint::tests::find ... ok
[INFO] [stdout] test disjoint::tests::one_isnt_an_identifier ... 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] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "54092ba7fc077d5ac21806b2cc1bf6b03b932c67327485799be42600c1a258a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54092ba7fc077d5ac21806b2cc1bf6b03b932c67327485799be42600c1a258a0", kill_on_drop: false }`
[INFO] [stdout] 54092ba7fc077d5ac21806b2cc1bf6b03b932c67327485799be42600c1a258a0