[INFO] fetching crate netapp 0.1.2...
[INFO] testing netapp-0.1.2 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate netapp 0.1.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate netapp 0.1.2 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate netapp 0.1.2
[INFO] finished tweaking crates.io crate netapp 0.1.2
[INFO] tweaked toml for crates.io crate netapp 0.1.2 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate netapp 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded arc-swap v1.2.0
[INFO] [stderr]   Downloaded vec-arena v1.0.0
[INFO] [stderr]   Downloaded rmp-serde v0.14.4
[INFO] [stderr]   Downloaded nb-connect v1.0.3
[INFO] [stderr]   Downloaded polling v2.0.2
[INFO] [stderr]   Downloaded ctor v0.1.19
[INFO] [stderr]   Downloaded kuska-sodiumoxide v0.2.5-0
[INFO] [stderr]   Downloaded libsodium-sys v0.2.6
[INFO] [stderr]   Downloaded kuska-handshake v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb9ed72e3cecaacc240d612d67666f6e09eb518ebd631626bc8571bd5797c054
[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" "eb9ed72e3cecaacc240d612d67666f6e09eb518ebd631626bc8571bd5797c054", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb9ed72e3cecaacc240d612d67666f6e09eb518ebd631626bc8571bd5797c054", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb9ed72e3cecaacc240d612d67666f6e09eb518ebd631626bc8571bd5797c054", kill_on_drop: false }`
[INFO] [stdout] eb9ed72e3cecaacc240d612d67666f6e09eb518ebd631626bc8571bd5797c054
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 44972227ac155048a70418928b8cd348b71b4e0c2786c93c1b07f31bf5864e60
[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" "44972227ac155048a70418928b8cd348b71b4e0c2786c93c1b07f31bf5864e60", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.63
[INFO] [stderr]    Compiling signal-hook v0.3.7
[INFO] [stderr]    Compiling futures-sink v0.3.13
[INFO] [stderr]    Compiling libsodium-sys v0.2.6
[INFO] [stderr]    Compiling futures-lite v1.11.3
[INFO] [stderr]    Compiling socket2 v0.3.19
[INFO] [stderr]    Compiling signal-hook-registry v1.3.0
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling err-derive v0.2.4
[INFO] [stderr]    Compiling rmp v0.8.10
[INFO] [stderr]    Compiling regex v1.4.3
[INFO] [stderr]    Compiling futures-channel v0.3.13
[INFO] [stderr]    Compiling blocking v1.0.2
[INFO] [stderr]    Compiling async-executor v1.4.0
[INFO] [stderr]    Compiling nb-connect v1.0.3
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling ctor v0.1.19
[INFO] [stderr]    Compiling serde_derive v1.0.124
[INFO] [stderr]    Compiling futures-macro v0.3.13
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
[INFO] [stderr]    Compiling async-attributes v1.1.2
[INFO] [stderr]    Compiling structopt-derive v0.4.14
[INFO] [stderr]    Compiling async-trait v0.1.48
[INFO] [stderr]    Compiling value-bag v1.0.0-alpha.6
[INFO] [stderr]    Compiling futures-util v0.3.13
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling thiserror v1.0.24
[INFO] [stderr]    Compiling polling v2.0.2
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling kv-log-macro v1.0.7
[INFO] [stderr]    Compiling env_logger v0.8.3
[INFO] [stderr]    Compiling structopt v0.3.21
[INFO] [stderr]    Compiling async-io v1.3.1
[INFO] [stderr]    Compiling async-process v1.0.2
[INFO] [stderr]    Compiling async-global-executor v2.0.2
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling async-std v1.9.0
[INFO] [stderr]    Compiling tokio v0.2.25
[INFO] [stderr]    Compiling futures-executor v0.3.13
[INFO] [stderr]    Compiling serde v1.0.124
[INFO] [stderr]    Compiling futures v0.3.13
[INFO] [stderr]    Compiling rmp-serde v0.14.4
[INFO] [stderr]    Compiling kuska-sodiumoxide v0.2.5-0
[INFO] [stderr]    Compiling kuska-handshake v0.1.2
[INFO] [stderr]    Compiling netapp v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(map_first_last)]
[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 `netapp` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "44972227ac155048a70418928b8cd348b71b4e0c2786c93c1b07f31bf5864e60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44972227ac155048a70418928b8cd348b71b4e0c2786c93c1b07f31bf5864e60", kill_on_drop: false }`
[INFO] [stdout] 44972227ac155048a70418928b8cd348b71b4e0c2786c93c1b07f31bf5864e60