[INFO] cloning repository https://github.com/rxs3072/RustExamples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rxs3072/RustExamples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frxs3072%2FRustExamples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frxs3072%2FRustExamples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8f897bc2c35051a8be73a48abc0d9c03bf9be3a8
[INFO] testing rxs3072/RustExamples against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frxs3072%2FRustExamples" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rxs3072/RustExamples on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rxs3072/RustExamples
[INFO] finished tweaking git repo https://github.com/rxs3072/RustExamples
[INFO] tweaked toml for git repo https://github.com/rxs3072/RustExamples written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/rxs3072/RustExamples already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dc7eff874740e0e9f2357d97405f484620a4ba536a64f4ea63996bb920ffe758
[INFO] running `Command { std: "docker" "start" "-a" "dc7eff874740e0e9f2357d97405f484620a4ba536a64f4ea63996bb920ffe758", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc7eff874740e0e9f2357d97405f484620a4ba536a64f4ea63996bb920ffe758", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc7eff874740e0e9f2357d97405f484620a4ba536a64f4ea63996bb920ffe758", kill_on_drop: false }`
[INFO] [stdout] dc7eff874740e0e9f2357d97405f484620a4ba536a64f4ea63996bb920ffe758
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9dab779bbe8990fb4c1f4656ba4936bbc96d04c6549c21e9e105c0b0ad695b98
[INFO] running `Command { std: "docker" "start" "-a" "9dab779bbe8990fb4c1f4656ba4936bbc96d04c6549c21e9e105c0b0ad695b98", kill_on_drop: false }`
[INFO] [stderr]    Compiling car v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:73:22
[INFO] [stdout]    |
[INFO] [stdout] 73 | _=>Some(List::Cons(u,v.removeFirst(s)))
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^ expected struct `Box`, found enum `Option`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `Box<List<T>>`
[INFO] [stdout]                 found enum `Option<List<T>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `car` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9dab779bbe8990fb4c1f4656ba4936bbc96d04c6549c21e9e105c0b0ad695b98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9dab779bbe8990fb4c1f4656ba4936bbc96d04c6549c21e9e105c0b0ad695b98", kill_on_drop: false }`
[INFO] [stdout] 9dab779bbe8990fb4c1f4656ba4936bbc96d04c6549c21e9e105c0b0ad695b98