[INFO] fetching crate persistentcache 0.1.6...
[INFO] checking persistentcache-0.1.6 against beta for pr-78714
[INFO] extracting crate persistentcache 0.1.6 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate persistentcache 0.1.6 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "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-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "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] 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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] edd98aefd5bf290452728afeae9b5c38d24caf39a44e84658f294a50121785cc
[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" "edd98aefd5bf290452728afeae9b5c38d24caf39a44e84658f294a50121785cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "edd98aefd5bf290452728afeae9b5c38d24caf39a44e84658f294a50121785cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edd98aefd5bf290452728afeae9b5c38d24caf39a44e84658f294a50121785cc", kill_on_drop: false }`
[INFO] [stdout] edd98aefd5bf290452728afeae9b5c38d24caf39a44e84658f294a50121785cc
[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" "RUSTFLAGS=--cap-lints=forbid" "-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" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d1eb0fdacbe9354f110e3f68ceba11041960c5303e8c3ccef6fda5f8835e9246
[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" "d1eb0fdacbe9354f110e3f68ceba11041960c5303e8c3ccef6fda5f8835e9246", 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 unicode-xid v0.0.4
[INFO] [stderr]    Compiling proc-macro2 v0.1.10
[INFO] [stderr]     Checking addr2line v0.14.0
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-iter v0.1.42
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking backtrace v0.3.54
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]    Compiling futures-await-quote v0.4.0
[INFO] [stderr]    Compiling futures-await-synom v0.12.0
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]    Compiling futures-await-syn v0.12.0
[INFO] [stderr]    Compiling bincode v1.3.1
[INFO] [stderr]    Compiling persistentcache_procmacro v0.0.3
[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/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] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `persistentcache_procmacro`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "d1eb0fdacbe9354f110e3f68ceba11041960c5303e8c3ccef6fda5f8835e9246", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1eb0fdacbe9354f110e3f68ceba11041960c5303e8c3ccef6fda5f8835e9246", kill_on_drop: false }`
[INFO] [stdout] d1eb0fdacbe9354f110e3f68ceba11041960c5303e8c3ccef6fda5f8835e9246