[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] checking jaredonline/rust-skip-list against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaredonline%2Frust-skip-list" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jaredonline/rust-skip-list on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "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-11/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "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-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b4c983e16675428a3109bc2de1cd2c4e6a49eedd62b95bf51ea34017e870f9ca
[INFO] running `Command { std: "docker" "start" "-a" "b4c983e16675428a3109bc2de1cd2c4e6a49eedd62b95bf51ea34017e870f9ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4c983e16675428a3109bc2de1cd2c4e6a49eedd62b95bf51ea34017e870f9ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4c983e16675428a3109bc2de1cd2c4e6a49eedd62b95bf51ea34017e870f9ca", kill_on_drop: false }`
[INFO] [stdout] b4c983e16675428a3109bc2de1cd2c4e6a49eedd62b95bf51ea34017e870f9ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 53d2f9149c1e1a4afe42443d082f921b7a9dcc27d5da57e310c3829ec33cc8f6
[INFO] running `Command { std: "docker" "start" "-a" "53d2f9149c1e1a4afe42443d082f921b7a9dcc27d5da57e310c3829ec33cc8f6", kill_on_drop: false }`
[INFO] [stderr]     Checking winapi v0.2.4
[INFO] [stderr]     Checking advapi32-sys v0.1.2
[INFO] [stderr]     Checking rand v0.3.11
[INFO] [stderr]     Checking 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]     |                  ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[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]     |                  ^^^^^^^^^^ help: remove these parentheses
[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]     |                  ^^^^^^^^^^ help: remove these parentheses
[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]     |                  ^^^^^^^^^^^ help: remove these parentheses
[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]     |                      ^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[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]     |              ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[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]     |              ^^^^^^^^^ help: remove these parentheses
[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]     |              ^^^^^^^^^ help: remove these parentheses
[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]     |              ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[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 1.40s
[INFO] running `Command { std: "docker" "inspect" "53d2f9149c1e1a4afe42443d082f921b7a9dcc27d5da57e310c3829ec33cc8f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53d2f9149c1e1a4afe42443d082f921b7a9dcc27d5da57e310c3829ec33cc8f6", kill_on_drop: false }`
[INFO] [stdout] 53d2f9149c1e1a4afe42443d082f921b7a9dcc27d5da57e310c3829ec33cc8f6