[INFO] cloning repository https://github.com/manifest/mqtt-service-example-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/manifest/mqtt-service-example-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmanifest%2Fmqtt-service-example-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmanifest%2Fmqtt-service-example-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8eecea2efe7e6a94cd7f3fbfd861ad63d9a6599e
[INFO] documenting manifest/mqtt-service-example-rs against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmanifest%2Fmqtt-service-example-rs" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/manifest/mqtt-service-example-rs on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/manifest/mqtt-service-example-rs
[INFO] finished tweaking git repo https://github.com/manifest/mqtt-service-example-rs
[INFO] tweaked toml for git repo https://github.com/manifest/mqtt-service-example-rs written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/manifest/mqtt-service-example-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro-hack v0.5.5
[INFO] [stderr]   Downloaded futures v0.1.26
[INFO] [stderr]   Downloaded tokio v0.1.19
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.14
[INFO] [stderr]   Downloaded proc-macro2 v0.4.28
[INFO] [stderr]   Downloaded syn v0.15.33
[INFO] [stderr]   Downloaded svc-authn v0.4.0
[INFO] [stderr]   Downloaded futures-select-macro-preview v0.3.0-alpha.14
[INFO] [stderr]   Downloaded derive_more v0.13.0
[INFO] [stderr]   Downloaded pretty_env_logger v0.2.5
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.14
[INFO] [stderr]   Downloaded svc-error v0.1.1
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.14
[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.14
[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.14
[INFO] [stderr]   Downloaded futures-executor-preview v0.3.0-alpha.14
[INFO] [stderr]   Downloaded tokio-rustls v0.8.1
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.14
[INFO] [stderr]   Downloaded mqtt311 v0.2.0
[INFO] [stderr]   Downloaded jsonwebtoken v5.0.1
[INFO] [stderr]   Downloaded libc v0.2.53
[INFO] [stderr]   Downloaded svc-agent v0.5.1
[INFO] [stderr]   Downloaded config v0.9.2
[INFO] [stderr]   Downloaded rumqtt v0.30.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9ea12e334e1783df2be05db0b2c15717480ee2851cbcab0d09c99ef1f228f7eb
[INFO] running `Command { std: "docker" "start" "-a" "9ea12e334e1783df2be05db0b2c15717480ee2851cbcab0d09c99ef1f228f7eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ea12e334e1783df2be05db0b2c15717480ee2851cbcab0d09c99ef1f228f7eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ea12e334e1783df2be05db0b2c15717480ee2851cbcab0d09c99ef1f228f7eb", kill_on_drop: false }`
[INFO] [stdout] 9ea12e334e1783df2be05db0b2c15717480ee2851cbcab0d09c99ef1f228f7eb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "RUSTDOCFLAGS=--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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 37bf15cafb0759f609a8d920539434e23b033e852fb9c756b810c71cedb9d0f5
[INFO] running `Command { std: "docker" "start" "-a" "37bf15cafb0759f609a8d920539434e23b033e852fb9c756b810c71cedb9d0f5", 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]    Compiling libc v0.2.53
[INFO] [stderr]    Compiling proc-macro2 v0.4.28
[INFO] [stderr]    Compiling syn v0.15.33
[INFO] [stderr]    Compiling cc v1.0.35
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking nom v4.2.3
[INFO] [stderr]     Checking serde-hjson v0.8.2
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.14
[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/futures-core-preview-0.3.0-alpha.14/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![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 `futures-core-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" "37bf15cafb0759f609a8d920539434e23b033e852fb9c756b810c71cedb9d0f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37bf15cafb0759f609a8d920539434e23b033e852fb9c756b810c71cedb9d0f5", kill_on_drop: false }`
[INFO] [stdout] 37bf15cafb0759f609a8d920539434e23b033e852fb9c756b810c71cedb9d0f5
