[INFO] cloning repository https://github.com/jaredonline/rust-skip-list
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jaredonline/rust-skip-list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaredonline%2Frust-skip-list", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaredonline%2Frust-skip-list'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 31e304a8a8ec2c917e47b7c4cfc3a84fe46768ea
[INFO] testing jaredonline/rust-skip-list against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaredonline%2Frust-skip-list" "/workspace/builds/worker-87/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-87/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jaredonline/rust-skip-list on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jaredonline/rust-skip-list
[INFO] finished tweaking git repo https://github.com/jaredonline/rust-skip-list
[INFO] tweaked toml for git repo https://github.com/jaredonline/rust-skip-list written to /workspace/builds/worker-87/source/Cargo.toml
[INFO] crate git repo https://github.com/jaredonline/rust-skip-list already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] babe91fc75f4403476eea2e73ccf833449809f14b48d7808fb3d88437dd7eb7e
[INFO] running `Command { std: "docker" "start" "-a" "babe91fc75f4403476eea2e73ccf833449809f14b48d7808fb3d88437dd7eb7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "babe91fc75f4403476eea2e73ccf833449809f14b48d7808fb3d88437dd7eb7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "babe91fc75f4403476eea2e73ccf833449809f14b48d7808fb3d88437dd7eb7e", kill_on_drop: false }`
[INFO] [stdout] babe91fc75f4403476eea2e73ccf833449809f14b48d7808fb3d88437dd7eb7e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 415ba8542d9962e8bc07e6ccf1668a8d9150f4db2228f180f6cae847c2e3915b
[INFO] running `Command { std: "docker" "start" "-a" "415ba8542d9962e8bc07e6ccf1668a8d9150f4db2228f180f6cae847c2e3915b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling winapi v0.2.4
[INFO] [stderr]    Compiling libc v0.1.10
[INFO] [stderr]    Compiling advapi32-sys v0.1.2
[INFO] [stderr]    Compiling rand v0.3.11
[INFO] [stderr]    Compiling linked-list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:235:14
[INFO] [stdout]     |
[INFO] [stdout] 235 |     for i in (0 .. 10) {
[INFO] [stdout]     |              ^       ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 235 -     for i in (0 .. 10) {
[INFO] [stdout] 235 +     for i in 0 .. 10 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:245:14
[INFO] [stdout]     |
[INFO] [stdout] 245 |     for i in (0 .. 10) {
[INFO] [stdout]     |              ^       ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 245 -     for i in (0 .. 10) {
[INFO] [stdout] 245 +     for i in 0 .. 10 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:259:14
[INFO] [stdout]     |
[INFO] [stdout] 259 |     for i in (0 .. 10) {
[INFO] [stdout]     |              ^       ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 259 -     for i in (0 .. 10) {
[INFO] [stdout] 259 +     for i in 0 .. 10 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:265:14
[INFO] [stdout]     |
[INFO] [stdout] 265 |     for i in (0 .. 100) {
[INFO] [stdout]     |              ^        ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 265 -     for i in (0 .. 100) {
[INFO] [stdout] 265 +     for i in 0 .. 100 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_node_count`
[INFO] [stdout]   --> src/main.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn get_node_count() -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.95s
[INFO] running `Command { std: "docker" "inspect" "415ba8542d9962e8bc07e6ccf1668a8d9150f4db2228f180f6cae847c2e3915b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "415ba8542d9962e8bc07e6ccf1668a8d9150f4db2228f180f6cae847c2e3915b", kill_on_drop: false }`
[INFO] [stdout] 415ba8542d9962e8bc07e6ccf1668a8d9150f4db2228f180f6cae847c2e3915b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5a338990f9d204f1921ad80815fc5ff1fa882d947c3692137e0134ea58df23d3
[INFO] running `Command { std: "docker" "start" "-a" "5a338990f9d204f1921ad80815fc5ff1fa882d947c3692137e0134ea58df23d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling linked-list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:301:18
[INFO] [stdout]     |
[INFO] [stdout] 301 |         for i in (0 .. 100) {
[INFO] [stdout]     |                  ^        ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 301 -         for i in (0 .. 100) {
[INFO] [stdout] 301 +         for i in 0 .. 100 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:305:18
[INFO] [stdout]     |
[INFO] [stdout] 305 |         for i in (0 .. 100) {
[INFO] [stdout]     |                  ^        ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 305 -         for i in (0 .. 100) {
[INFO] [stdout] 305 +         for i in 0 .. 100 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:313:18
[INFO] [stdout]     |
[INFO] [stdout] 313 |         for i in (0 .. 100) {
[INFO] [stdout]     |                  ^        ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 313 -         for i in (0 .. 100) {
[INFO] [stdout] 313 +         for i in 0 .. 100 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:328:18
[INFO] [stdout]     |
[INFO] [stdout] 328 |         for i in (1 .. 1000) {
[INFO] [stdout]     |                  ^         ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 328 -         for i in (1 .. 1000) {
[INFO] [stdout] 328 +         for i in 1 .. 1000 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:344:22
[INFO] [stdout]     |
[INFO] [stdout] 344 |             for i in (0 .. 7) {
[INFO] [stdout]     |                      ^      ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 344 -             for i in (0 .. 7) {
[INFO] [stdout] 344 +             for i in 0 .. 7 {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.92s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/linked_list-afc36664f1ab8cdc)
[INFO] running `Command { std: "docker" "inspect" "5a338990f9d204f1921ad80815fc5ff1fa882d947c3692137e0134ea58df23d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a338990f9d204f1921ad80815fc5ff1fa882d947c3692137e0134ea58df23d3", kill_on_drop: false }`
[INFO] [stdout] 5a338990f9d204f1921ad80815fc5ff1fa882d947c3692137e0134ea58df23d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f4492f66913aaad364dac7856395048a4e27cacf8d6f8ade7a3227d1abb4117e
[INFO] running `Command { std: "docker" "start" "-a" "f4492f66913aaad364dac7856395048a4e27cacf8d6f8ade7a3227d1abb4117e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:301:18
[INFO] [stderr]     |
[INFO] [stderr] 301 |         for i in (0 .. 100) {
[INFO] [stderr]     |                  ^        ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 301 -         for i in (0 .. 100) {
[INFO] [stderr] 301 +         for i in 0 .. 100 {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:305:18
[INFO] [stderr]     |
[INFO] [stderr] 305 |         for i in (0 .. 100) {
[INFO] [stderr]     |                  ^        ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 305 -         for i in (0 .. 100) {
[INFO] [stderr] 305 +         for i in 0 .. 100 {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:313:18
[INFO] [stderr]     |
[INFO] [stderr] 313 |         for i in (0 .. 100) {
[INFO] [stderr]     |                  ^        ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 313 -         for i in (0 .. 100) {
[INFO] [stderr] 313 +         for i in 0 .. 100 {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:328:18
[INFO] [stderr]     |
[INFO] [stderr] 328 |         for i in (1 .. 1000) {
[INFO] [stderr]     |                  ^         ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 328 -         for i in (1 .. 1000) {
[INFO] [stderr] 328 +         for i in 1 .. 1000 {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:344:22
[INFO] [stderr]     |
[INFO] [stderr] 344 |             for i in (0 .. 7) {
[INFO] [stderr]     |                      ^      ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 344 -             for i in (0 .. 7) {
[INFO] [stderr] 344 +             for i in 0 .. 7 {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: `linked-list` (bin "linked-list" test) generated 5 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.90s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/linked_list-afc36664f1ab8cdc)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test test::insert_at_for_one_value ... ok
[INFO] [stdout] test test::insert_increments_length ... ok
[INFO] [stdout] test test::insert_at_for_two_values ... ok
[INFO] [stdout] test test::nodes_should_not_leak ... ok
[INFO] [stdout] test test::many_inserts ... ok
[INFO] [stdout] test test::many_inserts_and_iteration ... ok
[INFO] [stdout] test test::many_inserts_lookup_iterations_should_be_less_than_items ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f4492f66913aaad364dac7856395048a4e27cacf8d6f8ade7a3227d1abb4117e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4492f66913aaad364dac7856395048a4e27cacf8d6f8ade7a3227d1abb4117e", kill_on_drop: false }`
[INFO] [stdout] f4492f66913aaad364dac7856395048a4e27cacf8d6f8ade7a3227d1abb4117e