[INFO] cloning repository https://github.com/1p1pd/gradebot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/1p1pd/gradebot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F1p1pd%2Fgradebot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F1p1pd%2Fgradebot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d67d6fdd4fe5bdcbbe67334fd6083806f04f990e
[INFO] testing 1p1pd/gradebot against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F1p1pd%2Fgradebot" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/1p1pd/gradebot on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/1p1pd/gradebot
[INFO] finished tweaking git repo https://github.com/1p1pd/gradebot
[INFO] tweaked toml for git repo https://github.com/1p1pd/gradebot written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/1p1pd/gradebot already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: the lock file /workspace/builds/worker-2/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c0c06ca770c4bc2764bea8886f66d7b05f1591458f2805913a51d2a999e68f5a
[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" "c0c06ca770c4bc2764bea8886f66d7b05f1591458f2805913a51d2a999e68f5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0c06ca770c4bc2764bea8886f66d7b05f1591458f2805913a51d2a999e68f5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0c06ca770c4bc2764bea8886f66d7b05f1591458f2805913a51d2a999e68f5a", kill_on_drop: false }`
[INFO] [stdout] c0c06ca770c4bc2764bea8886f66d7b05f1591458f2805913a51d2a999e68f5a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 01a2c0fcfdbd55094fcc5e25383dd297156143938d0013e6907a8d8199f522f4
[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" "01a2c0fcfdbd55094fcc5e25383dd297156143938d0013e6907a8d8199f522f4", kill_on_drop: false }`
[INFO] [stderr]    Compiling utf8-ranges v0.1.3
[INFO] [stderr]    Compiling regex-syntax v0.3.9
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling pq-sys v0.2.7
[INFO] [stderr]    Compiling syn v1.0.57
[INFO] [stderr]    Compiling lazy_static v0.1.16
[INFO] [stderr]    Compiling diesel_codegen v0.6.2
[INFO] [stderr]    Compiling byteorder v0.3.13
[INFO] [stderr]    Compiling traitobject v0.0.1
[INFO] [stderr]    Compiling modifier v0.1.0
[INFO] [stderr]    Compiling pest v0.3.3
[INFO] [stderr]    Compiling route-recognizer v0.1.13
[INFO] [stderr]    Compiling maplit v0.1.6
[INFO] [stderr]    Compiling unicode-bidi v0.2.6
[INFO] [stderr]    Compiling unsafe-any v0.4.2
[INFO] [stderr]    Compiling error v0.1.9
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling num_cpus v0.2.13
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling walkdir v0.1.8
[INFO] [stderr]    Compiling hpack v0.2.0
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling typemap v0.3.3
[INFO] [stderr]    Compiling uuid v0.2.3
[INFO] [stderr]    Compiling cookie v0.2.5
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr]    Compiling plugin v0.2.6
[INFO] [stderr]    Compiling solicit v0.4.4
[INFO] [stderr]    Compiling diesel v0.6.2
[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/diesel-0.6.2/src/lib.rs:5:35
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![cfg_attr(feature = "unstable", feature(specialization))]
[INFO] [stdout]   |                                   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling regex v0.1.80
[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 `diesel`
[INFO] [stderr] 
[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" "01a2c0fcfdbd55094fcc5e25383dd297156143938d0013e6907a8d8199f522f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01a2c0fcfdbd55094fcc5e25383dd297156143938d0013e6907a8d8199f522f4", kill_on_drop: false }`
[INFO] [stdout] 01a2c0fcfdbd55094fcc5e25383dd297156143938d0013e6907a8d8199f522f4