[INFO] cloning repository https://github.com/kyssion/rust_study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kyssion/rust_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkyssion%2Frust_study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkyssion%2Frust_study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c65ebba800b791a77d34f5c25b57b233429f6be1
[INFO] testing kyssion/rust_study against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkyssion%2Frust_study" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kyssion/rust_study on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kyssion/rust_study
[INFO] finished tweaking git repo https://github.com/kyssion/rust_study
[INFO] tweaked toml for git repo https://github.com/kyssion/rust_study written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/kyssion/rust_study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a854409f569753f377fefe8b711a80c16dd5c34d8bcd651406df84466357d0f9
[INFO] running `Command { std: "docker" "start" "-a" "a854409f569753f377fefe8b711a80c16dd5c34d8bcd651406df84466357d0f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a854409f569753f377fefe8b711a80c16dd5c34d8bcd651406df84466357d0f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a854409f569753f377fefe8b711a80c16dd5c34d8bcd651406df84466357d0f9", kill_on_drop: false }`
[INFO] [stdout] a854409f569753f377fefe8b711a80c16dd5c34d8bcd651406df84466357d0f9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a8350985b2e9b258b4ced542fe830226b2779bfd94afe03f8bf5e00bf9032ceb
[INFO] running `Command { std: "docker" "start" "-a" "a8350985b2e9b258b4ced542fe830226b2779bfd94afe03f8bf5e00bf9032ceb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/rust04_panic.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/rust06_functional_features.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let all = v1_iter.sum();
[INFO] [stdout]    |         ^^^ consider giving `all` a type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/rust06_functional_features.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let sum = Counter::new().zip(Counter::new().skip(1)).map(|(a,b)|{a*b}).filter(|x|x%3==0).sum();
[INFO] [stdout]    |         ^^^ consider giving `sum` a type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_study` due to 3 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "a8350985b2e9b258b4ced542fe830226b2779bfd94afe03f8bf5e00bf9032ceb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8350985b2e9b258b4ced542fe830226b2779bfd94afe03f8bf5e00bf9032ceb", kill_on_drop: false }`
[INFO] [stdout] a8350985b2e9b258b4ced542fe830226b2779bfd94afe03f8bf5e00bf9032ceb