[INFO] cloning repository https://github.com/reillysiemens/imagr
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/reillysiemens/imagr" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Freillysiemens%2Fimagr", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Freillysiemens%2Fimagr'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a72fd6449a4bd835d7c9b9919c3021e7d6e35bd5
[INFO] testing reillysiemens/imagr against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Freillysiemens%2Fimagr" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/reillysiemens/imagr on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/reillysiemens/imagr
[INFO] finished tweaking git repo https://github.com/reillysiemens/imagr
[INFO] tweaked toml for git repo https://github.com/reillysiemens/imagr written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/reillysiemens/imagr already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.3.25
[INFO] [stderr]   Downloaded curl v0.4.23
[INFO] [stderr]   Downloaded runtime-raw v0.3.0-alpha.4
[INFO] [stderr]   Downloaded futures-select-macro-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded sluice v0.4.1
[INFO] [stderr]   Downloaded runtime-native v0.3.0-alpha.5
[INFO] [stderr]   Downloaded futures-timer v0.2.1
[INFO] [stderr]   Downloaded runtime v0.3.0-alpha.6
[INFO] [stderr]   Downloaded async-datagram v2.2.0
[INFO] [stderr]   Downloaded surf v1.0.1
[INFO] [stderr]   Downloaded async-std v0.99.4
[INFO] [stderr]   Downloaded romio v0.3.0-alpha.9
[INFO] [stderr]   Downloaded chttp v0.5.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6b858fa62ca724f2a13e86ea8d456b3972561ac3598434ce41c0b6441195f76a
[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" "6b858fa62ca724f2a13e86ea8d456b3972561ac3598434ce41c0b6441195f76a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6b858fa62ca724f2a13e86ea8d456b3972561ac3598434ce41c0b6441195f76a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b858fa62ca724f2a13e86ea8d456b3972561ac3598434ce41c0b6441195f76a", kill_on_drop: false }`
[INFO] [stdout] 6b858fa62ca724f2a13e86ea8d456b3972561ac3598434ce41c0b6441195f76a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f79a7634bf1bd191c65426d7cf6ea97185b228190f0553514afe9899bb8bf7d
[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" "4f79a7634bf1bd191c65426d7cf6ea97185b228190f0553514afe9899bb8bf7d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling futures v0.1.28
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling cc v1.0.38
[INFO] [stderr]    Compiling syn v0.15.43
[INFO] [stderr]    Compiling proc-macro2 v1.0.2
[INFO] [stderr]    Compiling pkg-config v0.3.15
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling ppv-lite86 v0.2.5
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]    Compiling scopeguard v1.0.0
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling serde v1.0.98
[INFO] [stderr]    Compiling openssl v0.10.24
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]    Compiling curl v0.4.23
[INFO] [stderr]    Compiling async-datagram v3.0.0
[INFO] [stderr]    Compiling async-ready v3.0.0
[INFO] [stderr]    Compiling regex-syntax v0.6.11
[INFO] [stderr]    Compiling chttp v0.5.5
[INFO] [stderr]    Compiling quick-error v1.2.2
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling dtoa v0.4.4
[INFO] [stderr]    Compiling async-datagram v2.2.0
[INFO] [stderr]    Compiling termcolor v1.0.5
[INFO] [stderr]    Compiling rustc-demangle v0.1.15
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/async-datagram-2.2.0/src/lib.rs:43:1
[INFO] [stdout]    |
[INFO] [stdout] 43 | #![feature(futures_api)]
[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 `async-datagram`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "4f79a7634bf1bd191c65426d7cf6ea97185b228190f0553514afe9899bb8bf7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f79a7634bf1bd191c65426d7cf6ea97185b228190f0553514afe9899bb8bf7d", kill_on_drop: false }`
[INFO] [stdout] 4f79a7634bf1bd191c65426d7cf6ea97185b228190f0553514afe9899bb8bf7d