[INFO] fetching crate persawkv 0.0.0-alpha.1...
[INFO] checking persawkv-0.0.0-alpha.1 against beta for pr-78714
[INFO] extracting crate persawkv 0.0.0-alpha.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate persawkv 0.0.0-alpha.1 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 persawkv 0.0.0-alpha.1
[INFO] finished tweaking crates.io crate persawkv 0.0.0-alpha.1
[INFO] tweaked toml for crates.io crate persawkv 0.0.0-alpha.1 written to /workspace/builds/worker-9/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]  Downloading crates ...
[INFO] [stderr]   Downloaded unsigned-varint v0.2.3
[INFO] [stderr]   Downloaded delegate v0.3.0
[INFO] [stderr]   Downloaded persy v0.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 4c4152e6aeaaac5f854ea978f280b1e6d77d2835aa3ba64594914cfd4c05d44e
[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" "4c4152e6aeaaac5f854ea978f280b1e6d77d2835aa3ba64594914cfd4c05d44e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c4152e6aeaaac5f854ea978f280b1e6d77d2835aa3ba64594914cfd4c05d44e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c4152e6aeaaac5f854ea978f280b1e6d77d2835aa3ba64594914cfd4c05d44e", kill_on_drop: false }`
[INFO] [stdout] 4c4152e6aeaaac5f854ea978f280b1e6d77d2835aa3ba64594914cfd4c05d44e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] f3b0b14c3ef8afe598e05c8c691f849e3c34e3641d35af639c8f2dfa081c6cdf
[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" "f3b0b14c3ef8afe598e05c8c691f849e3c34e3641d35af639c8f2dfa081c6cdf", kill_on_drop: false }`
[INFO] [stderr]    Compiling build_const v0.2.1
[INFO] [stderr]     Checking data-encoding v2.3.1
[INFO] [stderr]     Checking unsigned-varint v0.2.3
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]     Checking persy v0.7.1
[INFO] [stderr]    Compiling delegate v0.3.0
[INFO] [stderr]     Checking persawkv v0.0.0-alpha.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> benches/benches.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 `persawkv`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "f3b0b14c3ef8afe598e05c8c691f849e3c34e3641d35af639c8f2dfa081c6cdf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3b0b14c3ef8afe598e05c8c691f849e3c34e3641d35af639c8f2dfa081c6cdf", kill_on_drop: false }`
[INFO] [stdout] f3b0b14c3ef8afe598e05c8c691f849e3c34e3641d35af639c8f2dfa081c6cdf