[INFO] cloning repository https://github.com/lcdr/base_server
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lcdr/base_server" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flcdr%2Fbase_server", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flcdr%2Fbase_server'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 541e796b76c323cc8a0107bade048514a0b26d14
[INFO] testing lcdr/base_server against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flcdr%2Fbase_server" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lcdr/base_server 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/lcdr/base_server
[INFO] finished tweaking git repo https://github.com/lcdr/base_server
[INFO] tweaked toml for git repo https://github.com/lcdr/base_server written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/lcdr/base_server 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]  Downloading crates ...
[INFO] [stderr]   Downloaded webpki v0.21.2
[INFO] [stderr]   Downloaded ring v0.16.13
[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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 716069a7ca36614fc925d45c12b12bf8fb28ece9fd974bf746b0914c02baaf40
[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" "716069a7ca36614fc925d45c12b12bf8fb28ece9fd974bf746b0914c02baaf40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "716069a7ca36614fc925d45c12b12bf8fb28ece9fd974bf746b0914c02baaf40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "716069a7ca36614fc925d45c12b12bf8fb28ece9fd974bf746b0914c02baaf40", kill_on_drop: false }`
[INFO] [stdout] 716069a7ca36614fc925d45c12b12bf8fb28ece9fd974bf746b0914c02baaf40
[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=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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 30a0aaa96c1b1c07a245b04da2dcafa9be0c7eb0e1dc855c2c6c98b1c0fff6d3
[INFO] running `Command { std: "docker" "start" "-a" "30a0aaa96c1b1c07a245b04da2dcafa9be0c7eb0e1dc855c2c6c98b1c0fff6d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.54
[INFO] [stderr]    Compiling proc-macro2 v1.0.17
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling syn v1.0.27
[INFO] [stderr]    Compiling once_cell v1.4.0
[INFO] [stderr]    Compiling untrusted v0.7.1
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling endio_bit v0.1.0 (https://github.com/lcdr/endio_bit?rev=46b1b0eda359dd85b5eabf9714e839c3728c75af#46b1b0ed)
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]    Compiling ring v0.16.13
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]    Compiling flate2 v1.0.19
[INFO] [stderr]    Compiling webpki v0.21.2
[INFO] [stderr]    Compiling sct v0.6.0
[INFO] [stderr]    Compiling rustls v0.16.0
[INFO] [stderr]    Compiling webpki-roots v0.18.0
[INFO] [stderr]    Compiling endio_derive v0.2.0 (https://github.com/lcdr/endio?rev=6e988eed6d9d3b1fa0edde34062edfb3b01d344a#6e988eed)
[INFO] [stderr]    Compiling serde_derive v1.0.110
[INFO] [stderr]    Compiling lu_packets_derive v0.1.0 (https://github.com/lcdr/lu_packets?rev=92331a88930b884db093bb4dc683ddd8d8de7c3e#92331a88)
[INFO] [stderr]    Compiling endio v0.2.0 (https://github.com/lcdr/endio?rev=6e988eed6d9d3b1fa0edde34062edfb3b01d344a#6e988eed)
[INFO] [stderr]    Compiling lu_packets v0.1.0 (https://github.com/lcdr/lu_packets?rev=92331a88930b884db093bb4dc683ddd8d8de7c3e#92331a88)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/git/checkouts/lu_packets-a45db4b40825b0eb/92331a8/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(arbitrary_enum_discriminant)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/git/checkouts/lu_packets-a45db4b40825b0eb/92331a8/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lu_packets`
[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" "30a0aaa96c1b1c07a245b04da2dcafa9be0c7eb0e1dc855c2c6c98b1c0fff6d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30a0aaa96c1b1c07a245b04da2dcafa9be0c7eb0e1dc855c2c6c98b1c0fff6d3", kill_on_drop: false }`
[INFO] [stdout] 30a0aaa96c1b1c07a245b04da2dcafa9be0c7eb0e1dc855c2c6c98b1c0fff6d3