[INFO] fetching crate rusty-p4 0.1.0-alpha.2...
[INFO] testing rusty-p4-0.1.0-alpha.2 against 1.60.0 for beta-1.61-1
[INFO] extracting crate rusty-p4 0.1.0-alpha.2 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate rusty-p4 0.1.0-alpha.2 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rusty-p4 0.1.0-alpha.2
[INFO] finished tweaking crates.io crate rusty-p4 0.1.0-alpha.2
[INFO] tweaked toml for crates.io crate rusty-p4 0.1.0-alpha.2 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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 prost v0.5.0
[INFO] [stderr]   Downloaded prost-types v0.6.1
[INFO] [stderr]   Downloaded prost-types v0.5.0
[INFO] [stderr]   Downloaded grpcio-compiler v0.5.0
[INFO] [stderr]   Downloaded futures01 v0.1.31
[INFO] [stderr]   Downloaded tokio-net v0.2.0-alpha.5
[INFO] [stderr]   Downloaded prost-derive v0.5.0
[INFO] [stderr]   Downloaded pin-project v0.4.0-alpha.11
[INFO] [stderr]   Downloaded prost-derive v0.6.1
[INFO] [stderr]   Downloaded prost v0.6.1
[INFO] [stderr]   Downloaded tokio-fs v0.2.0-alpha.5
[INFO] [stderr]   Downloaded tokio-io v0.2.0-alpha.5
[INFO] [stderr]   Downloaded tokio-sync v0.2.0-alpha.5
[INFO] [stderr]   Downloaded tokio-macros v0.2.0-alpha.5
[INFO] [stderr]   Downloaded tokio v0.2.0-alpha.5
[INFO] [stderr]   Downloaded prost-build v0.6.1
[INFO] [stderr]   Downloaded pin-project-internal v0.4.0-alpha.11
[INFO] [stderr]   Downloaded tokio-executor v0.2.0-alpha.5
[INFO] [stderr]   Downloaded futures-join-macro-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded tokio-codec v0.2.0-alpha.5
[INFO] [stderr]   Downloaded futures-select-macro-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded tokio-timer v0.3.0-alpha.5
[INFO] [stderr]   Downloaded grpcio v0.5.4
[INFO] [stderr]   Downloaded rusty-p4-proto v0.1.0-alpha.1
[INFO] [stderr]   Downloaded grpcio-sys v0.5.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3fadb6d78fd275df216f8a77c9240d73ca206a62c255531e2143d6ad3864a8cc
[INFO] running `Command { std: "docker" "start" "-a" "3fadb6d78fd275df216f8a77c9240d73ca206a62c255531e2143d6ad3864a8cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fadb6d78fd275df216f8a77c9240d73ca206a62c255531e2143d6ad3864a8cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fadb6d78fd275df216f8a77c9240d73ca206a62c255531e2143d6ad3864a8cc", kill_on_drop: false }`
[INFO] [stdout] 3fadb6d78fd275df216f8a77c9240d73ca206a62c255531e2143d6ad3864a8cc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c3d8dbc28c62d95594a6dc6b0997c0ce83ce09426314936ec1cfdce1cd566f77
[INFO] running `Command { std: "docker" "start" "-a" "c3d8dbc28c62d95594a6dc6b0997c0ce83ce09426314936ec1cfdce1cd566f77", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling anyhow v1.0.56
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling pin-project-internal v0.4.0-alpha.11
[INFO] [stderr]    Compiling protobuf v2.27.1
[INFO] [stderr]    Compiling bindgen v0.51.1
[INFO] [stderr]    Compiling fastrand v1.7.0
[INFO] [stderr]    Compiling fixedbitset v0.2.0
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]    Compiling multimap v0.8.3
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling hex v0.3.2
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling clang-sys v0.28.1
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling libz-sys v1.1.5
[INFO] [stderr]    Compiling tracing-core v0.1.25
[INFO] [stderr]    Compiling cmake v0.1.48
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling futures01 v0.1.31
[INFO] [stderr]    Compiling object v0.27.1
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling prost-build v0.6.1
[INFO] [stderr]    Compiling regex v1.5.5
[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 synstructure v0.12.6
[INFO] [stderr]    Compiling derive-new v0.5.9
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling tokio-macros v0.2.0-alpha.5
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling tempfile v3.3.0
[INFO] [stderr]    Compiling tracing v0.1.33
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling prost-derive v0.6.1
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling cexpr v0.3.6
[INFO] [stderr]    Compiling pin-project v0.4.0-alpha.11
[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]   |                                      ^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling tokio-io v0.2.0-alpha.5
[INFO] [stderr]    Compiling tokio-codec v0.2.0-alpha.5
[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` 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" "c3d8dbc28c62d95594a6dc6b0997c0ce83ce09426314936ec1cfdce1cd566f77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3d8dbc28c62d95594a6dc6b0997c0ce83ce09426314936ec1cfdce1cd566f77", kill_on_drop: false }`
[INFO] [stdout] c3d8dbc28c62d95594a6dc6b0997c0ce83ce09426314936ec1cfdce1cd566f77