[INFO] updating cached repository https://github.com/mgdm/rrt
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85a6af7711c77651bad4e398a48bb36f8a87e6aa
[INFO] testing mgdm/rrt against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmgdm%2Frrt" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mgdm/rrt on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mgdm/rrt
[INFO] finished tweaking git repo https://github.com/mgdm/rrt
[INFO] tweaked toml for git repo https://github.com/mgdm/rrt written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/mgdm/rrt already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 915024a66bc4040af5a1149293149e1ce3c3d57f4920b4f5e5ee15569ed1b298
[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" "915024a66bc4040af5a1149293149e1ce3c3d57f4920b4f5e5ee15569ed1b298", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "915024a66bc4040af5a1149293149e1ce3c3d57f4920b4f5e5ee15569ed1b298", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "915024a66bc4040af5a1149293149e1ce3c3d57f4920b4f5e5ee15569ed1b298", kill_on_drop: false }`
[INFO] [stdout] 915024a66bc4040af5a1149293149e1ce3c3d57f4920b4f5e5ee15569ed1b298
[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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8ca2856a8ea627a28348ff5bc0ac8651c46f21e1a7f5f1d5a235ef7fca9f4e16
[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" "8ca2856a8ea627a28348ff5bc0ac8651c46f21e1a7f5f1d5a235ef7fca9f4e16", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.18
[INFO] [stderr]    Compiling quote v0.3.10
[INFO] [stderr]    Compiling serde v0.8.21
[INFO] [stderr]    Compiling strsim v0.5.2
[INFO] [stderr]    Compiling dtoa v0.2.2
[INFO] [stderr]    Compiling lazy_static v0.2.2
[INFO] [stderr]    Compiling itoa v0.1.1
[INFO] [stderr]    Compiling num-integer v0.1.32
[INFO] [stderr]    Compiling num-complex v0.1.35
[INFO] [stderr]    Compiling num-iter v0.1.32
[INFO] [stderr]    Compiling syn v0.10.5
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling regex v0.1.80
[INFO] [stderr]    Compiling num-bigint v0.1.35
[INFO] [stderr]    Compiling num-rational v0.1.35
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]    Compiling num v0.1.36
[INFO] [stderr]    Compiling docopt v0.6.86
[INFO] [stderr]    Compiling serde_codegen v0.8.21
[INFO] [stderr]    Compiling serde_json v0.8.4
[INFO] [stderr]    Compiling serde_derive v0.8.21
[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/serde_derive-0.8.21/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro, proc_macro_lib)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_derive`.
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[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" "8ca2856a8ea627a28348ff5bc0ac8651c46f21e1a7f5f1d5a235ef7fca9f4e16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ca2856a8ea627a28348ff5bc0ac8651c46f21e1a7f5f1d5a235ef7fca9f4e16", kill_on_drop: false }`
[INFO] [stdout] 8ca2856a8ea627a28348ff5bc0ac8651c46f21e1a7f5f1d5a235ef7fca9f4e16