[INFO] cloning repository https://github.com/kylegibson15/rust-leetcode
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kylegibson15/rust-leetcode" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkylegibson15%2Frust-leetcode", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkylegibson15%2Frust-leetcode'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7e7d74ceedf0d7467020f4e7cfb564f4da1a1999
[INFO] testing kylegibson15/rust-leetcode against master#733b47ea4b1b86216f14ef56e49440c33933f230+rustflags=-Copt-level=3 for pr-138759-retry
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkylegibson15%2Frust-leetcode" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kylegibson15/rust-leetcode
[INFO] finished tweaking git repo https://github.com/kylegibson15/rust-leetcode
[INFO] tweaked toml for git repo https://github.com/kylegibson15/rust-leetcode written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kylegibson15/rust-leetcode on toolchain 733b47ea4b1b86216f14ef56e49440c33933f230
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kylegibson15/rust-leetcode 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" "+733b47ea4b1b86216f14ef56e49440c33933f230" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ba555127c858f60d7c9206028196a05d30f2a15b220978d6619e4a4f9ba8116d
[INFO] running `Command { std: "docker" "start" "-a" "ba555127c858f60d7c9206028196a05d30f2a15b220978d6619e4a4f9ba8116d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ba555127c858f60d7c9206028196a05d30f2a15b220978d6619e4a4f9ba8116d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba555127c858f60d7c9206028196a05d30f2a15b220978d6619e4a4f9ba8116d", kill_on_drop: false }`
[INFO] [stdout] ba555127c858f60d7c9206028196a05d30f2a15b220978d6619e4a4f9ba8116d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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 -Copt-level=3" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f90dc070a67091aa5443ac6c91b10858e047cb14137a5bbca89509f57f33efc9
[INFO] running `Command { std: "docker" "start" "-a" "f90dc070a67091aa5443ac6c91b10858e047cb14137a5bbca89509f57f33efc9", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.109
[INFO] [stderr]    Compiling ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling cookbook v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/middle_of_linked_list.rs:15:48
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn middle_node(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |    -----------                                 ^^^^^^^^^^^^^^^^^^^^^ expected `Option<Box<ListNode>>`, found `()`
[INFO] [stdout]    |    |
[INFO] [stdout]    |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `Option<Box<ListNode>>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] help: consider returning the local binding `head`
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn middle_node(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout] 17 +     head
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/middle_of_linked_list.rs:24:15
[INFO] [stdout]    |
[INFO] [stdout] 21 |   let mut current: &Option<Box<ListNode>> = list;
[INFO] [stdout]    |                    ---------------------- expected due to this type
[INFO] [stdout] ...
[INFO] [stdout] 24 |     current = current.unwrap()
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^ expected `&Option<Box<ListNode>>`, found `Box<ListNode>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&Option<Box<_>>`
[INFO] [stdout]                  found struct `Box<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/middle_of_linked_list.rs:26:3
[INFO] [stdout]    |
[INFO] [stdout] 22 | /   loop {
[INFO] [stdout] 23 | |     println!("{:?}", current);
[INFO] [stdout] 24 | |     current = current.unwrap()
[INFO] [stdout] 25 | |   }
[INFO] [stdout]    | |___- any code following this expression is unreachable
[INFO] [stdout] 26 |     length
[INFO] [stdout]    |     ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cookbook` (bin "cookbook") due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "f90dc070a67091aa5443ac6c91b10858e047cb14137a5bbca89509f57f33efc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f90dc070a67091aa5443ac6c91b10858e047cb14137a5bbca89509f57f33efc9", kill_on_drop: false }`
[INFO] [stdout] f90dc070a67091aa5443ac6c91b10858e047cb14137a5bbca89509f57f33efc9
