[INFO] fetching crate persistentcache 0.1.6...
[INFO] documenting persistentcache-0.1.6 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate persistentcache 0.1.6 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate persistentcache 0.1.6 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate persistentcache 0.1.6
[INFO] finished tweaking crates.io crate persistentcache 0.1.6
[INFO] tweaked toml for crates.io crate persistentcache 0.1.6 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "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" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[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-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 432b4f1cd0f8a9c43f7528b0f7a38a0aac13a91488150d7f059a05c6a229f84d
[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" "432b4f1cd0f8a9c43f7528b0f7a38a0aac13a91488150d7f059a05c6a229f84d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "432b4f1cd0f8a9c43f7528b0f7a38a0aac13a91488150d7f059a05c6a229f84d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "432b4f1cd0f8a9c43f7528b0f7a38a0aac13a91488150d7f059a05c6a229f84d", kill_on_drop: false }`
[INFO] [stdout] 432b4f1cd0f8a9c43f7528b0f7a38a0aac13a91488150d7f059a05c6a229f84d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9053fd4e201fb0c62faaeb55f22dc27c3bc78ee3a3f21cc0228c6ccac0c00bd4
[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" "9053fd4e201fb0c62faaeb55f22dc27c3bc78ee3a3f21cc0228c6ccac0c00bd4", kill_on_drop: false }`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]    Compiling redis v0.8.0
[INFO] [stderr]    Compiling proc-macro2 v0.1.10
[INFO] [stderr]    Compiling bincode v1.3.1
[INFO] [stderr]    Compiling futures-await-quote v0.4.0
[INFO] [stderr]    Compiling futures-await-synom v0.12.0
[INFO] [stderr]    Compiling futures-await-syn v0.12.0
[INFO] [stderr]    Compiling persistentcache_procmacro v0.0.3
[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/persistentcache_procmacro-0.0.3/src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(proc_macro)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `persistentcache_procmacro`.
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "9053fd4e201fb0c62faaeb55f22dc27c3bc78ee3a3f21cc0228c6ccac0c00bd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9053fd4e201fb0c62faaeb55f22dc27c3bc78ee3a3f21cc0228c6ccac0c00bd4", kill_on_drop: false }`
[INFO] [stdout] 9053fd4e201fb0c62faaeb55f22dc27c3bc78ee3a3f21cc0228c6ccac0c00bd4