[INFO] cloning repository https://github.com/Subhash91134857/PointerInRust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Subhash91134857/PointerInRust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSubhash91134857%2FPointerInRust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSubhash91134857%2FPointerInRust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5eecef79ca24ff9ab52982b36dcd9837fc57f8fd
[INFO] checking Subhash91134857/PointerInRust/5eecef79ca24ff9ab52982b36dcd9837fc57f8fd against try#498fce24f39c1ecbb0abe08824e72162da853341 for pr-129935
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSubhash91134857%2FPointerInRust" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Subhash91134857/PointerInRust on toolchain 498fce24f39c1ecbb0abe08824e72162da853341
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Subhash91134857/PointerInRust
[INFO] finished tweaking git repo https://github.com/Subhash91134857/PointerInRust
[INFO] tweaked toml for git repo https://github.com/Subhash91134857/PointerInRust written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Subhash91134857/PointerInRust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking Subhash91134857/PointerInRust/5eecef79ca24ff9ab52982b36dcd9837fc57f8fd against try#498fce24f39c1ecbb0abe08824e72162da853341 for pr-129935
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSubhash91134857%2FPointerInRust" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Subhash91134857/PointerInRust on toolchain 498fce24f39c1ecbb0abe08824e72162da853341
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Subhash91134857/PointerInRust
[INFO] finished tweaking git repo https://github.com/Subhash91134857/PointerInRust
[INFO] tweaked toml for git repo https://github.com/Subhash91134857/PointerInRust written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Subhash91134857/PointerInRust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:96c0aa5895ecf336b730ef27bcdde6e21027415df19888aad3cf1448e5d65d90" "/opt/rustwide/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c6f0b9f9aeda3602c771d9b65b27fac46ae7ae664be874d82ba6876386911d66
[INFO] running `Command { std: "docker" "start" "-a" "c6f0b9f9aeda3602c771d9b65b27fac46ae7ae664be874d82ba6876386911d66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c6f0b9f9aeda3602c771d9b65b27fac46ae7ae664be874d82ba6876386911d66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6f0b9f9aeda3602c771d9b65b27fac46ae7ae664be874d82ba6876386911d66", kill_on_drop: false }`
[INFO] [stdout] c6f0b9f9aeda3602c771d9b65b27fac46ae7ae664be874d82ba6876386911d66
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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@sha256:96c0aa5895ecf336b730ef27bcdde6e21027415df19888aad3cf1448e5d65d90" "/opt/rustwide/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0231ab603c7a582ec56e01255a2400498ae85fe57d6d4d123a32cd6303be23af
[INFO] running `Command { std: "docker" "start" "-a" "0231ab603c7a582ec56e01255a2400498ae85fe57d6d4d123a32cd6303be23af", kill_on_drop: false }`
[INFO] [stderr]     Checking smart_pointer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]   --> src/lib.rs:44:6
[INFO] [stdout]    |
[INFO] [stdout] 44 | enum List {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]   --> src/lib.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | impl List {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 49 |     fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/lib.rs:45:10
[INFO] [stdout]    |
[INFO] [stdout] 45 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]    |     ---- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 45 |     Cons((), RefCell<Rc<List>>),
[INFO] [stdout]    |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "0231ab603c7a582ec56e01255a2400498ae85fe57d6d4d123a32cd6303be23af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0231ab603c7a582ec56e01255a2400498ae85fe57d6d4d123a32cd6303be23af", kill_on_drop: false }`
[INFO] [stdout] 0231ab603c7a582ec56e01255a2400498ae85fe57d6d4d123a32cd6303be23af