[INFO] cloning repository https://github.com/adi/immutable
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/adi/immutable" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadi%2Fimmutable", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadi%2Fimmutable'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a5560de697a5b9d0889b193a65e54d4ce89b19e3
[INFO] checking adi/immutable against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadi%2Fimmutable" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/adi/immutable on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/adi/immutable
[INFO] finished tweaking git repo https://github.com/adi/immutable
[INFO] tweaked toml for git repo https://github.com/adi/immutable written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/adi/immutable already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "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] 1a3ed8617b6879af1b9f2de5bba6596a876563089ac5a0f16c284c55e45f40fe
[INFO] running `Command { std: "docker" "start" "-a" "1a3ed8617b6879af1b9f2de5bba6596a876563089ac5a0f16c284c55e45f40fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1a3ed8617b6879af1b9f2de5bba6596a876563089ac5a0f16c284c55e45f40fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a3ed8617b6879af1b9f2de5bba6596a876563089ac5a0f16c284c55e45f40fe", kill_on_drop: false }`
[INFO] [stdout] 1a3ed8617b6879af1b9f2de5bba6596a876563089ac5a0f16c284c55e45f40fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "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] 37b52243130dbda76a3cf066822ef0d5069b296c8869af0f317900e68bae67c5
[INFO] running `Command { std: "docker" "start" "-a" "37b52243130dbda76a3cf066822ef0d5069b296c8869af0f317900e68bae67c5", kill_on_drop: false }`
[INFO] [stderr]     Checking immutable v0.1.0 (/opt/rustwide/workdir/immutable)
[INFO] [stdout] warning: field is never read: `v`
[INFO] [stdout]   --> immutable/src/lib.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     v: Vec<Rc<T>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `v`
[INFO] [stdout]   --> immutable/src/lib.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     v: Vec<Rc<T>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `first`
[INFO] [stdout]   --> immutable/src/lib.rs:57:5
[INFO] [stdout]    |
[INFO] [stdout] 57 |     first: Rc<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `second`
[INFO] [stdout]   --> immutable/src/lib.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     second: Rc<U>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `pairs`
[INFO] [stdout]   --> immutable/src/lib.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pairs: Vec<Pair<Rc<T>, Rc<U>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `v`
[INFO] [stdout]   --> immutable/src/lib.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     v: Vec<Rc<T>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `v`
[INFO] [stdout]   --> immutable/src/lib.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     v: Vec<Rc<T>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `first`
[INFO] [stdout]   --> immutable/src/lib.rs:57:5
[INFO] [stdout]    |
[INFO] [stdout] 57 |     first: Rc<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `second`
[INFO] [stdout]   --> immutable/src/lib.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     second: Rc<U>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `pairs`
[INFO] [stdout]   --> immutable/src/lib.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pairs: Vec<Pair<Rc<T>, Rc<U>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking example v0.1.0 (/opt/rustwide/workdir/example)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> example/src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> example/src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.05s
[INFO] running `Command { std: "docker" "inspect" "37b52243130dbda76a3cf066822ef0d5069b296c8869af0f317900e68bae67c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37b52243130dbda76a3cf066822ef0d5069b296c8869af0f317900e68bae67c5", kill_on_drop: false }`
[INFO] [stdout] 37b52243130dbda76a3cf066822ef0d5069b296c8869af0f317900e68bae67c5