[INFO] cloning repository https://github.com/tamanobi/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tamanobi/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftamanobi%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftamanobi%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 71e2d57323497439e16836e3bcc080d9472a9fa5
[INFO] checking tamanobi/rust-practice against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftamanobi%2Frust-practice" "/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/tamanobi/rust-practice on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tamanobi/rust-practice
[INFO] finished tweaking git repo https://github.com/tamanobi/rust-practice
[INFO] tweaked toml for git repo https://github.com/tamanobi/rust-practice written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/tamanobi/rust-practice already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 90fc205ae85dd0b3f6b21d0fd138939b83168e5c669d05258bbe9970712833dd
[INFO] running `Command { std: "docker" "start" "-a" "90fc205ae85dd0b3f6b21d0fd138939b83168e5c669d05258bbe9970712833dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90fc205ae85dd0b3f6b21d0fd138939b83168e5c669d05258bbe9970712833dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90fc205ae85dd0b3f6b21d0fd138939b83168e5c669d05258bbe9970712833dd", kill_on_drop: false }`
[INFO] [stdout] 90fc205ae85dd0b3f6b21d0fd138939b83168e5c669d05258bbe9970712833dd
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e11dfa389c3f7c40ed053f5893d1f7a730ba899099fd7d56403d11205ca7f73e
[INFO] running `Command { std: "docker" "start" "-a" "e11dfa389c3f7c40ed053f5893d1f7a730ba899099fd7d56403d11205ca7f73e", kill_on_drop: false }`
[INFO] [stderr]     Checking hello-cargo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `perform`
[INFO] [stdout]  --> src/fruit_basket.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn perform() -> HashMap<String, u32> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `perform`
[INFO] [stdout]  --> src/indexing_tuple.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn perform() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `perform`
[INFO] [stdout]  --> src/read_file_content.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn perform(path: PathBuf) -> Result<String, Error> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/iter.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub fn new(length: usize) -> Counter {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `perform`
[INFO] [stdout]  --> src/fruit_basket.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn perform() -> HashMap<String, u32> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `perform`
[INFO] [stdout]  --> src/indexing_tuple.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn perform() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "e11dfa389c3f7c40ed053f5893d1f7a730ba899099fd7d56403d11205ca7f73e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e11dfa389c3f7c40ed053f5893d1f7a730ba899099fd7d56403d11205ca7f73e", kill_on_drop: false }`
[INFO] [stdout] e11dfa389c3f7c40ed053f5893d1f7a730ba899099fd7d56403d11205ca7f73e