[INFO] fetching crate naive 0.1.1...
[INFO] testing naive-0.1.1 against 1.47.0 for beta-1.48-1
[INFO] extracting crate naive 0.1.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate naive 0.1.1 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate naive 0.1.1
[INFO] finished tweaking crates.io crate naive 0.1.1
[INFO] tweaked toml for crates.io crate naive 0.1.1 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 44710d1c589e361e8c4a3cb28c6cf1dd2953954bebaa055b00f9a06cf601ac9b
[INFO] running `Command { std: "docker" "start" "-a" "44710d1c589e361e8c4a3cb28c6cf1dd2953954bebaa055b00f9a06cf601ac9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44710d1c589e361e8c4a3cb28c6cf1dd2953954bebaa055b00f9a06cf601ac9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44710d1c589e361e8c4a3cb28c6cf1dd2953954bebaa055b00f9a06cf601ac9b", kill_on_drop: false }`
[INFO] [stdout] 44710d1c589e361e8c4a3cb28c6cf1dd2953954bebaa055b00f9a06cf601ac9b
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 07e17a425cd3d5089f0321e0b0b9251a5612b4b42e26f95f44be5ac24093822c
[INFO] running `Command { std: "docker" "start" "-a" "07e17a425cd3d5089f0321e0b0b9251a5612b4b42e26f95f44be5ac24093822c", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling utf-8 v0.7.5
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling futures-join-macro-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling http v0.1.21
[INFO] [stderr]    Compiling input_buffer v0.2.0
[INFO] [stderr]    Compiling url_serde v0.2.0
[INFO] [stderr]    Compiling tokio-tls v0.2.1
[INFO] [stderr]    Compiling tokio-dns-unofficial v0.3.1
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling sha-1 v0.8.2
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.18
[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/futures-util-preview-0.3.0-alpha.18/src/lib.rs:4:38
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature = "async-await", feature(async_await))]
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling tungstenite v0.8.1
[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 `futures-util-preview`.
[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" "07e17a425cd3d5089f0321e0b0b9251a5612b4b42e26f95f44be5ac24093822c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07e17a425cd3d5089f0321e0b0b9251a5612b4b42e26f95f44be5ac24093822c", kill_on_drop: false }`
[INFO] [stdout] 07e17a425cd3d5089f0321e0b0b9251a5612b4b42e26f95f44be5ac24093822c
