[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] building rylynchen/leetcode-rust against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frylynchen%2Fleetcode-rust" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rylynchen/leetcode-rust on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-0-tc1/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: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d92a153971e6b7c72d271607f92d5381cbb6e6acb2f1bb5f462c73cf4038a01d
[INFO] running `Command { std: "docker" "start" "-a" "d92a153971e6b7c72d271607f92d5381cbb6e6acb2f1bb5f462c73cf4038a01d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d92a153971e6b7c72d271607f92d5381cbb6e6acb2f1bb5f462c73cf4038a01d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d92a153971e6b7c72d271607f92d5381cbb6e6acb2f1bb5f462c73cf4038a01d", kill_on_drop: false }`
[INFO] [stdout] d92a153971e6b7c72d271607f92d5381cbb6e6acb2f1bb5f462c73cf4038a01d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb3a50d49bb2037c79919cdf0981cca25d8c7601d3fb486082e0514e7afcadb6
[INFO] running `Command { std: "docker" "start" "-a" "bb3a50d49bb2037c79919cdf0981cca25d8c7601d3fb486082e0514e7afcadb6", 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] help: try using a fully qualified path to specify the expected types
[INFO] [stdout]    |
[INFO] [stdout] 32 |             stack.push(Some(<Rc<RefCell<TreeNode>> as Borrow<Borrowed>>::borrow(&node).val));
[INFO] [stdout]    |                             +++++++++++++++++++++++++++++++++++++++++++++++++++++    ~
[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]    |                                           ^^^ unknown field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0609]: no field `val` on type `&Option<Rc<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]    |                              ^^^ unknown field
[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` (bin "144_binary-tree-preorder-traversal") due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "bb3a50d49bb2037c79919cdf0981cca25d8c7601d3fb486082e0514e7afcadb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb3a50d49bb2037c79919cdf0981cca25d8c7601d3fb486082e0514e7afcadb6", kill_on_drop: false }`
[INFO] [stdout] bb3a50d49bb2037c79919cdf0981cca25d8c7601d3fb486082e0514e7afcadb6