[INFO] cloning repository https://github.com/dvc94ch/ipld-daemon
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dvc94ch/ipld-daemon" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdvc94ch%2Fipld-daemon", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdvc94ch%2Fipld-daemon'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 721ad2825d9f2a917344142bd294400b9e23f405
[INFO] documenting dvc94ch/ipld-daemon against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdvc94ch%2Fipld-daemon" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dvc94ch/ipld-daemon on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dvc94ch/ipld-daemon
[INFO] finished tweaking git repo https://github.com/dvc94ch/ipld-daemon
[INFO] tweaked toml for git repo https://github.com/dvc94ch/ipld-daemon written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/dvc94ch/ipld-daemon already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+1.54.0" "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] d88c599c56881f4c6f7a115899f608e525bfc462539d19741da59902abb2861d
[INFO] running `Command { std: "docker" "start" "-a" "d88c599c56881f4c6f7a115899f608e525bfc462539d19741da59902abb2861d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d88c599c56881f4c6f7a115899f608e525bfc462539d19741da59902abb2861d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d88c599c56881f4c6f7a115899f608e525bfc462539d19741da59902abb2861d", kill_on_drop: false }`
[INFO] [stdout] d88c599c56881f4c6f7a115899f608e525bfc462539d19741da59902abb2861d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84897d0c94d439651e004fdb023e2f54c398bfe6db6e19fe9a77c8475054caeb
[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" "84897d0c94d439651e004fdb023e2f54c398bfe6db6e19fe9a77c8475054caeb", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking seahash v3.0.6
[INFO] [stderr]    Compiling integer-encoding v1.0.7
[INFO] [stderr]     Checking base-x v0.2.5
[INFO] [stderr]     Checking arc-swap v0.4.3
[INFO] [stderr]     Checking whoami v0.5.3
[INFO] [stderr]    Compiling fasthash-sys v0.3.2
[INFO] [stderr]    Compiling libsystemd-sys v0.2.2
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking errno v0.2.4
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]     Checking slog-async v2.3.0
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking backtrace v0.3.38
[INFO] [stderr]     Checking chrono v0.4.9
[INFO] [stderr]     Checking sha-1 v0.8.1
[INFO] [stderr]     Checking sha2 v0.8.0
[INFO] [stderr]     Checking sha3 v0.8.2
[INFO] [stderr]     Checking blake2 v0.8.1
[INFO] [stderr]     Checking term v0.5.2
[INFO] [stderr]     Checking signal-hook-registry v1.1.1
[INFO] [stderr]    Compiling multihash_derive v0.1.0 (https://github.com/dvc94ch/rust-multihash?branch=cli#5ac35cd7)
[INFO] [stderr]     Checking multibase v0.6.0 (https://github.com/multiformats/rust-multibase#f22326bc)
[INFO] [stderr]     Checking xoroshiro128 v0.3.0
[INFO] [stderr]     Checking signal-hook v0.1.10
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking slog-journald v2.1.1
[INFO] [stderr]     Checking exitfailure v0.5.1
[INFO] [stderr]     Checking caps v0.3.4-alpha.0 (https://github.com/dvc94ch/caps-rs?branch=misc#32c0bbb0)
[INFO] [stderr]     Checking slog-term v2.4.1
[INFO] [stderr]     Checking fasthash v0.4.0
[INFO] [stderr]     Checking multihash v0.8.1-pre (https://github.com/dvc94ch/rust-multihash?branch=cli#5ac35cd7)
[INFO] [stderr]    Compiling synstructure v0.12.1
[INFO] [stderr]    Compiling proc-macro-error v0.2.6
[INFO] [stderr]     Checking cid v0.3.1 (https://github.com/dvc94ch/rust-cid?branch=cli#52c079b2)
[INFO] [stderr]    Compiling proc-macro-hack v0.5.9
[INFO] [stderr]    Compiling async-trait v0.1.13
[INFO] [stderr]    Compiling serde_derive v1.0.101
[INFO] [stderr]    Compiling structopt-derive v0.3.2
[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]     Checking libipld-base v0.1.0 (https://github.com/dvc94ch/rust-ipld#195df890)
[INFO] [stderr]    Compiling dag-cbor-derive v0.1.0 (https://github.com/dvc94ch/rust-ipld#195df890)
[INFO] [stderr]     Checking structopt v0.3.2
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking libipld-macro v0.1.0 (https://github.com/dvc94ch/rust-ipld#195df890)
[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] [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" "84897d0c94d439651e004fdb023e2f54c398bfe6db6e19fe9a77c8475054caeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84897d0c94d439651e004fdb023e2f54c398bfe6db6e19fe9a77c8475054caeb", kill_on_drop: false }`
[INFO] [stdout] 84897d0c94d439651e004fdb023e2f54c398bfe6db6e19fe9a77c8475054caeb
