[INFO] fetching crate akita_core 0.3.5...
[INFO] testing akita_core-0.3.5 against 1.59.0 for beta-1.60-1
[INFO] extracting crate akita_core 0.3.5 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate akita_core 0.3.5 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate akita_core 0.3.5
[INFO] finished tweaking crates.io crate akita_core 0.3.5
[INFO] tweaked toml for crates.io crate akita_core 0.3.5 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bigdecimal v0.3.0
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1985993acec0c17e7df6eba24c0131d6049bf20626d18445ad8aadabb63c20da
[INFO] running `Command { std: "docker" "start" "-a" "1985993acec0c17e7df6eba24c0131d6049bf20626d18445ad8aadabb63c20da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1985993acec0c17e7df6eba24c0131d6049bf20626d18445ad8aadabb63c20da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1985993acec0c17e7df6eba24c0131d6049bf20626d18445ad8aadabb63c20da", kill_on_drop: false }`
[INFO] [stdout] 1985993acec0c17e7df6eba24c0131d6049bf20626d18445ad8aadabb63c20da
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 00746b55be8bef7d9b362c7561f282f6d3b1a5e163dffff28bf874a287a3a9a4
[INFO] running `Command { std: "docker" "start" "-a" "00746b55be8bef7d9b362c7561f282f6d3b1a5e163dffff28bf874a287a3a9a4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling safemem v0.3.3
[INFO] [stderr]    Compiling indexmap v1.8.0
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling twox-hash v1.6.2
[INFO] [stderr]    Compiling base64 v0.9.3
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling bigdecimal v0.3.0
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling akita_core v0.3.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(associated_type_bounds)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 `akita_core` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "00746b55be8bef7d9b362c7561f282f6d3b1a5e163dffff28bf874a287a3a9a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00746b55be8bef7d9b362c7561f282f6d3b1a5e163dffff28bf874a287a3a9a4", kill_on_drop: false }`
[INFO] [stdout] 00746b55be8bef7d9b362c7561f282f6d3b1a5e163dffff28bf874a287a3a9a4