[INFO] cloning repository https://github.com/sutetako/rust_learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sutetako/rust_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsutetako%2Frust_learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsutetako%2Frust_learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 69ae47d04f313d24b1b40ef9c7ea7c4f9920a3d0
[INFO] checking sutetako/rust_learning against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsutetako%2Frust_learning" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sutetako/rust_learning on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sutetako/rust_learning
[INFO] finished tweaking git repo https://github.com/sutetako/rust_learning
[INFO] tweaked toml for git repo https://github.com/sutetako/rust_learning written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/sutetako/rust_learning already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5767e66e67fb286be24bb62ff2e2b09058a866079f5ea24d286be16ec06a5bcc
[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" "5767e66e67fb286be24bb62ff2e2b09058a866079f5ea24d286be16ec06a5bcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5767e66e67fb286be24bb62ff2e2b09058a866079f5ea24d286be16ec06a5bcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5767e66e67fb286be24bb62ff2e2b09058a866079f5ea24d286be16ec06a5bcc", kill_on_drop: false }`
[INFO] [stdout] 5767e66e67fb286be24bb62ff2e2b09058a866079f5ea24d286be16ec06a5bcc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "-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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ab296251fabd2b3edcc667a05bf208b1a7475048fa8412ee44e19a41ed823d9c
[INFO] running `Command { std: "docker" "start" "-a" "ab296251fabd2b3edcc667a05bf208b1a7475048fa8412ee44e19a41ed823d9c", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking rust_learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]     --> src/main.rs:1814:32
[INFO] [stdout]      |
[INFO] [stdout] 1814 |         fn say_hello(out: &mut Write) -> std::io::Result<()> {
[INFO] [stdout]      |                                ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]     --> src/main.rs:1840:26
[INFO] [stdout]      |
[INFO] [stdout] 1840 |         let writer: &mut Write = &mut buf; // ok
[INFO] [stdout]      |                          ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `core::str::<impl str>::trim_right_matches`: superseded by `trim_end_matches`
[INFO] [stdout]     --> src/main.rs:1469:27
[INFO] [stdout]      |
[INFO] [stdout] 1469 |             self.plural().trim_right_matches('s')
[INFO] [stdout]      |                           ^^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated associated function: `trim_end_matches`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0109]: type arguments are not allowed for this type
[INFO] [stdout]     --> src/main.rs:1854:15
[INFO] [stdout]      |
[INFO] [stdout] 1854 |         buf::<Vec>.write_all(b"hello").expect("error");
[INFO] [stdout]      |               ^^^ type argument not allowed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0109`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_learning`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "ab296251fabd2b3edcc667a05bf208b1a7475048fa8412ee44e19a41ed823d9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab296251fabd2b3edcc667a05bf208b1a7475048fa8412ee44e19a41ed823d9c", kill_on_drop: false }`
[INFO] [stdout] ab296251fabd2b3edcc667a05bf208b1a7475048fa8412ee44e19a41ed823d9c