[INFO] cloning repository https://github.com/wjlewis/little_scheme
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wjlewis/little_scheme" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwjlewis%2Flittle_scheme", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwjlewis%2Flittle_scheme'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] be5bdc48658ddf85626e38b87afe71f9097d7a54
[INFO] checking wjlewis/little_scheme against master#36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923 for pr-81863
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwjlewis%2Flittle_scheme" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wjlewis/little_scheme on toolchain 36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wjlewis/little_scheme
[INFO] finished tweaking git repo https://github.com/wjlewis/little_scheme
[INFO] tweaked toml for git repo https://github.com/wjlewis/little_scheme written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/wjlewis/little_scheme already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "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] 70af9874096a6ca5449ca599e4c2445ad07a6e433853ebddd5a0a4e7b305a414
[INFO] running `Command { std: "docker" "start" "-a" "70af9874096a6ca5449ca599e4c2445ad07a6e433853ebddd5a0a4e7b305a414", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "70af9874096a6ca5449ca599e4c2445ad07a6e433853ebddd5a0a4e7b305a414", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70af9874096a6ca5449ca599e4c2445ad07a6e433853ebddd5a0a4e7b305a414", kill_on_drop: false }`
[INFO] [stdout] 70af9874096a6ca5449ca599e4c2445ad07a6e433853ebddd5a0a4e7b305a414
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4a6fa729759dd333b0c533ca7e61d7e8a988a3d375d60f101929b430c6efecd9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4a6fa729759dd333b0c533ca7e61d7e8a988a3d375d60f101929b430c6efecd9", kill_on_drop: false }`
[INFO] [stderr]     Checking little_scheme v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/heap.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn new(size: usize, get_roots: Box<dyn Fn() -> Vec<usize>>) -> Heap {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `obj`
[INFO] [stdout]   --> src/memory/header.rs:97:42
[INFO] [stdout]    |
[INFO] [stdout] 97 |         fn alloc<T: MemWrite>(&mut self, obj: &T) -> usize {
[INFO] [stdout]    |                                          ^^^ help: if this is intentional, prefix it with an underscore: `_obj`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` 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 1.50s
[INFO] running `Command { std: "docker" "inspect" "4a6fa729759dd333b0c533ca7e61d7e8a988a3d375d60f101929b430c6efecd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a6fa729759dd333b0c533ca7e61d7e8a988a3d375d60f101929b430c6efecd9", kill_on_drop: false }`
[INFO] [stdout] 4a6fa729759dd333b0c533ca7e61d7e8a988a3d375d60f101929b430c6efecd9