[INFO] cloning repository https://github.com/iterate/miniwoop-backend
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iterate/miniwoop-backend" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e6bc456029694b3624ddb52a303126a58c68449
[INFO] testing iterate/miniwoop-backend 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%2Fiterate%2Fminiwoop-backend" "/workspace/builds/worker-103/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-103/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iterate/miniwoop-backend 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/iterate/miniwoop-backend
[INFO] finished tweaking git repo https://github.com/iterate/miniwoop-backend
[INFO] tweaked toml for git repo https://github.com/iterate/miniwoop-backend written to /workspace/builds/worker-103/source/Cargo.toml
[INFO] crate git repo https://github.com/iterate/miniwoop-backend 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] [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 uuid v0.5.0
[INFO] [stderr]   Downloaded num-traits v0.1.39
[INFO] [stderr]   Downloaded memchr v1.0.1
[INFO] [stderr]   Downloaded hyper v0.11.0
[INFO] [stderr]   Downloaded net2 v0.2.29
[INFO] [stderr]   Downloaded tokio-core v0.1.8
[INFO] [stderr]   Downloaded num_cpus v1.5.1
[INFO] [stderr]   Downloaded percent-encoding v1.0.0
[INFO] [stderr]   Downloaded unreachable v0.1.1
[INFO] [stderr]   Downloaded bytes v0.4.4
[INFO] [stderr]   Downloaded slab v0.3.0
[INFO] [stderr]   Downloaded lazycell v0.4.0
[INFO] [stderr]   Downloaded futures-cpupool v0.1.5
[INFO] [stderr]   Downloaded redox_syscall v0.1.18
[INFO] [stderr]   Downloaded rustc-serialize v0.3.24
[INFO] [stderr]   Downloaded httparse v1.2.3
[INFO] [stderr]   Downloaded num-iter v0.1.33
[INFO] [stderr]   Downloaded num v0.1.39
[INFO] [stderr]   Downloaded num-integer v0.1.34
[INFO] [stderr]   Downloaded void v1.0.2
[INFO] [stderr]   Downloaded log v0.3.8
[INFO] [stderr]   Downloaded aho-corasick v0.6.3
[INFO] [stderr]   Downloaded regex-syntax v0.4.1
[INFO] [stderr]   Downloaded serde_derive_internals v0.15.1
[INFO] [stderr]   Downloaded ansi_term v0.9.0
[INFO] [stderr]   Downloaded thread-id v3.1.0
[INFO] [stderr]   Downloaded unicase v2.0.0
[INFO] [stderr]   Downloaded dtoa v0.4.1
[INFO] [stderr]   Downloaded byteorder v1.0.0
[INFO] [stderr]   Downloaded futures v0.1.14
[INFO] [stderr]   Downloaded chrono v0.3.1
[INFO] [stderr]   Downloaded serde_derive v1.0.8
[INFO] [stderr]   Downloaded serde v1.0.8
[INFO] [stderr]   Downloaded time v0.1.37
[INFO] [stderr]   Downloaded mime v0.3.2
[INFO] [stderr]   Downloaded mio v0.6.9
[INFO] [stderr]   Downloaded libc v0.2.24
[INFO] [stderr]   Downloaded iovec v0.1.0
[INFO] [stderr]   Downloaded regex v0.2.2
[INFO] [stderr]   Downloaded take v0.1.0
[INFO] [stderr]   Downloaded itoa v0.3.1
[INFO] [stderr]   Downloaded cfg-if v0.1.1
[INFO] [stderr]   Downloaded scoped-tls v0.1.0
[INFO] [stderr]   Downloaded tokio-io v0.1.2
[INFO] [stderr]   Downloaded thread_local v0.3.3
[INFO] [stderr]   Downloaded env_logger v0.4.3
[INFO] [stderr]   Downloaded serde_json v1.0.2
[INFO] [stderr]   Downloaded quote v0.3.15
[INFO] [stderr]   Downloaded synom v0.11.3
[INFO] [stderr]   Downloaded unicode-xid v0.0.4
[INFO] [stderr]   Downloaded syn v0.11.11
[INFO] [stderr]   Downloaded tokio-service v0.1.0
[INFO] [stderr]   Downloaded tokio-proto v0.1.1
[INFO] [stderr]   Downloaded smallvec v0.2.1
[INFO] [stderr]   Downloaded pretty_env_logger v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/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] a7b78b5a1e34f7a23977c34218148d5e0e843375b39c8daea31530dbce09b7e9
[INFO] running `Command { std: "docker" "start" "-a" "a7b78b5a1e34f7a23977c34218148d5e0e843375b39c8daea31530dbce09b7e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7b78b5a1e34f7a23977c34218148d5e0e843375b39c8daea31530dbce09b7e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7b78b5a1e34f7a23977c34218148d5e0e843375b39c8daea31530dbce09b7e9", kill_on_drop: false }`
[INFO] [stdout] a7b78b5a1e34f7a23977c34218148d5e0e843375b39c8daea31530dbce09b7e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/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] ec62759a2d26cb76f8cca589aa6340ccc693e4af34301155a2254c7d55ab0e52
[INFO] running `Command { std: "docker" "start" "-a" "ec62759a2d26cb76f8cca589aa6340ccc693e4af34301155a2254c7d55ab0e52", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.24
[INFO] [stderr]    Compiling futures v0.1.14
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]    Compiling byteorder v1.0.0
[INFO] [stderr]    Compiling cfg-if v0.1.1
[INFO] [stderr]    Compiling num-traits v0.1.39
[INFO] [stderr]    Compiling lazycell v0.4.0
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling slab v0.3.0
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling scoped-tls v0.1.0
[INFO] [stderr]    Compiling serde v1.0.8
[INFO] [stderr]    Compiling smallvec v0.2.1
[INFO] [stderr]    Compiling take v0.1.0
[INFO] [stderr]    Compiling safemem v0.2.0
[INFO] [stderr]    Compiling httparse v1.2.3
[INFO] [stderr]    Compiling dtoa v0.4.1
[INFO] [stderr]    Compiling percent-encoding v1.0.0
[INFO] [stderr]    Compiling itoa v0.3.1
[INFO] [stderr]    Compiling ansi_term v0.9.0
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling unreachable v0.1.1
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]    Compiling unicase v2.0.0
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling base64 v0.6.0
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling num-integer v0.1.34
[INFO] [stderr]    Compiling iovec v0.1.0
[INFO] [stderr]    Compiling thread-id v3.1.0
[INFO] [stderr]    Compiling memchr v1.0.1
[INFO] [stderr]    Compiling net2 v0.2.29
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling num_cpus v1.5.1
[INFO] [stderr]    Compiling time v0.1.37
[INFO] [stderr]    Compiling tokio-service v0.1.0
[INFO] [stderr]    Compiling serde_json v1.0.2
[INFO] [stderr]    Compiling mime v0.3.2
[INFO] [stderr]    Compiling thread_local v0.3.3
[INFO] [stderr]    Compiling bytes v0.4.4
[INFO] [stderr]    Compiling mio v0.6.9
[INFO] [stderr]    Compiling aho-corasick v0.6.3
[INFO] [stderr]    Compiling futures-cpupool v0.1.5
[INFO] [stderr]    Compiling num-iter v0.1.33
[INFO] [stderr]    Compiling uuid v0.5.0
[INFO] [stderr]    Compiling num v0.1.39
[INFO] [stderr]    Compiling serde_derive_internals v0.15.1
[INFO] [stderr]    Compiling regex v0.2.2
[INFO] [stderr]    Compiling chrono v0.3.1
[INFO] [stderr]    Compiling tokio-io v0.1.2
[INFO] [stderr]    Compiling tokio-core v0.1.8
[INFO] [stderr]    Compiling serde_derive v1.0.8
[INFO] [stderr]    Compiling tokio-proto v0.1.1
[INFO] [stderr]    Compiling env_logger v0.4.3
[INFO] [stderr]    Compiling pretty_env_logger v0.1.1
[INFO] [stderr]    Compiling hyper v0.11.0
[INFO] [stderr]    Compiling miniwoop-backend v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `slice_patterns` has been stable since 1.42.0 and no longer requires an attribute to enable
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `miniwoop-backend` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ec62759a2d26cb76f8cca589aa6340ccc693e4af34301155a2254c7d55ab0e52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec62759a2d26cb76f8cca589aa6340ccc693e4af34301155a2254c7d55ab0e52", kill_on_drop: false }`
[INFO] [stdout] ec62759a2d26cb76f8cca589aa6340ccc693e4af34301155a2254c7d55ab0e52