[INFO] cloning repository https://github.com/rylynchen/leetcode-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rylynchen/leetcode-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frylynchen%2Fleetcode-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frylynchen%2Fleetcode-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b0ea50f96e1d8a7a410028dd7178137d678d0aea
[INFO] testing rylynchen/leetcode-rust against 1.47.0 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frylynchen%2Fleetcode-rust" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rylynchen/leetcode-rust on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rylynchen/leetcode-rust
[INFO] finished tweaking git repo https://github.com/rylynchen/leetcode-rust
[INFO] tweaked toml for git repo https://github.com/rylynchen/leetcode-rust written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/rylynchen/leetcode-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4726ef0fc2de1a40a21924a06c708ca1c1ce5415dd42a064a3debf4faaa86c13
[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" "4726ef0fc2de1a40a21924a06c708ca1c1ce5415dd42a064a3debf4faaa86c13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4726ef0fc2de1a40a21924a06c708ca1c1ce5415dd42a064a3debf4faaa86c13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4726ef0fc2de1a40a21924a06c708ca1c1ce5415dd42a064a3debf4faaa86c13", kill_on_drop: false }`
[INFO] [stdout] 4726ef0fc2de1a40a21924a06c708ca1c1ce5415dd42a064a3debf4faaa86c13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aae4e804d7d8b9e148b742999a283350575647f34c1b3f5c31356cad275f2c92
[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" "aae4e804d7d8b9e148b742999a283350575647f34c1b3f5c31356cad275f2c92", kill_on_drop: false }`
[INFO] [stderr]    Compiling leetcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/bin/144_binary-tree-preorder-traversal.rs:32:34
[INFO] [stdout]    |
[INFO] [stdout] 32 |             stack.push(Some(node.borrow().val));
[INFO] [stdout]    |                             -----^^^^^^--
[INFO] [stdout]    |                             |    |
[INFO] [stdout]    |                             |    cannot infer type for type parameter `Borrowed` declared on the trait `Borrow`
[INFO] [stdout]    |                             this method call resolves to `&Borrowed`
[INFO] [stdout]    |
[INFO] [stdout]    = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0609]: no field `val` on type `&_`
[INFO] [stdout]   --> src/bin/144_binary-tree-preorder-traversal.rs:32:43
[INFO] [stdout]    |
[INFO] [stdout] 32 |             stack.push(Some(node.borrow().val));
[INFO] [stdout]    |                                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0609]: no field `val` on type `&std::option::Option<std::rc::Rc<std::cell::RefCell<TreeNode>>>`
[INFO] [stdout]   --> src/bin/144_binary-tree-preorder-traversal.rs:42:30
[INFO] [stdout]    |
[INFO] [stdout] 42 |     stack.push(root.borrow().val);
[INFO] [stdout]    |                              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0282, E0609.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `leetcode`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "aae4e804d7d8b9e148b742999a283350575647f34c1b3f5c31356cad275f2c92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aae4e804d7d8b9e148b742999a283350575647f34c1b3f5c31356cad275f2c92", kill_on_drop: false }`
[INFO] [stdout] aae4e804d7d8b9e148b742999a283350575647f34c1b3f5c31356cad275f2c92
