[INFO] cloning repository https://github.com/luki446/digit-reader
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/luki446/digit-reader" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluki446%2Fdigit-reader", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluki446%2Fdigit-reader'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3d0ed1ae01a3a9ede23a0efdd94dff011d8546e0
[INFO] testing luki446/digit-reader against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluki446%2Fdigit-reader" "/workspace/builds/worker-57/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-57/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/luki446/digit-reader 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/luki446/digit-reader
[INFO] finished tweaking git repo https://github.com/luki446/digit-reader
[INFO] tweaked toml for git repo https://github.com/luki446/digit-reader written to /workspace/builds/worker-57/source/Cargo.toml
[INFO] crate git repo https://github.com/luki446/digit-reader 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nn v0.1.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/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] feba2483b98dc4ca776a26cdd603c946026aff3f2c81b26235b63a324133faeb
[INFO] running `Command { std: "docker" "start" "-a" "feba2483b98dc4ca776a26cdd603c946026aff3f2c81b26235b63a324133faeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "feba2483b98dc4ca776a26cdd603c946026aff3f2c81b26235b63a324133faeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "feba2483b98dc4ca776a26cdd603c946026aff3f2c81b26235b63a324133faeb", kill_on_drop: false }`
[INFO] [stdout] feba2483b98dc4ca776a26cdd603c946026aff3f2c81b26235b63a324133faeb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/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] 5a011cc12bccfab381a8c7df9cb1528bc5b5354ef075b41a6f24df097d90035e
[INFO] running `Command { std: "docker" "start" "-a" "5a011cc12bccfab381a8c7df9cb1528bc5b5354ef075b41a6f24df097d90035e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling nn v0.1.6
[INFO] [stderr]    Compiling digit-reader v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: could not find `duration` in `time`
[INFO] [stdout]    --> src/main.rs:100:79
[INFO] [stdout]     |
[INFO] [stdout] 100 |                     .halt_condition(HaltCondition::Timer(std::time::duration::Duration::seconds(20)))
[INFO] [stdout]     |                                                                               ^^^^^^^^ not found in `std::time::duration`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 2   | use core::time::Duration;
[INFO] [stdout]     |
[INFO] [stdout] 2   | use std::time::Duration;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0433, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `digit-reader` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "5a011cc12bccfab381a8c7df9cb1528bc5b5354ef075b41a6f24df097d90035e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a011cc12bccfab381a8c7df9cb1528bc5b5354ef075b41a6f24df097d90035e", kill_on_drop: false }`
[INFO] [stdout] 5a011cc12bccfab381a8c7df9cb1528bc5b5354ef075b41a6f24df097d90035e