[INFO] cloning repository https://github.com/KaiserKarel/subcriber
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KaiserKarel/subcriber" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKaiserKarel%2Fsubcriber", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKaiserKarel%2Fsubcriber'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2ee27def2ee5b903d32f75da5a454be193456819
[INFO] testing KaiserKarel/subcriber against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKaiserKarel%2Fsubcriber" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/KaiserKarel/subcriber 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/KaiserKarel/subcriber
[INFO] finished tweaking git repo https://github.com/KaiserKarel/subcriber
[INFO] tweaked toml for git repo https://github.com/KaiserKarel/subcriber written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/KaiserKarel/subcriber 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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 35e3836fe3c89c206a3e1eef6d41007d7c919beff0633d3d3220ba259ecdfd77
[INFO] running `Command { std: "docker" "start" "-a" "35e3836fe3c89c206a3e1eef6d41007d7c919beff0633d3d3220ba259ecdfd77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "35e3836fe3c89c206a3e1eef6d41007d7c919beff0633d3d3220ba259ecdfd77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35e3836fe3c89c206a3e1eef6d41007d7c919beff0633d3d3220ba259ecdfd77", kill_on_drop: false }`
[INFO] [stdout] 35e3836fe3c89c206a3e1eef6d41007d7c919beff0633d3d3220ba259ecdfd77
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] fbcf8868fa0fda70d42989f00f11534b8505477ab71bbfc274b83fca80af53bb
[INFO] running `Command { std: "docker" "start" "-a" "fbcf8868fa0fda70d42989f00f11534b8505477ab71bbfc274b83fca80af53bb", kill_on_drop: false }`
[INFO] [stderr]    Compiling funty v1.1.0
[INFO] [stderr]    Compiling wee_alloc v0.4.5
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling memory_units v0.4.0
[INFO] [stderr]    Compiling plotters-backend v0.3.0
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling array-init v1.0.0
[INFO] [stderr]    Compiling ink_prelude v3.0.0-rc3
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling semver v0.11.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.4
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling crypto-mac v0.8.0
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/array-init-1.0.0/src/lib.rs:2:41
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "const-generics", feature(const_generics))]
[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 `array-init` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "fbcf8868fa0fda70d42989f00f11534b8505477ab71bbfc274b83fca80af53bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbcf8868fa0fda70d42989f00f11534b8505477ab71bbfc274b83fca80af53bb", kill_on_drop: false }`
[INFO] [stdout] fbcf8868fa0fda70d42989f00f11534b8505477ab71bbfc274b83fca80af53bb