[INFO] updating cached repository https://github.com/withoutboats/bpb
[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] b1ef5ca1d2dea0e2ec0b1616f087f110ea17adfa
[INFO] testing withoutboats/bpb against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwithoutboats%2Fbpb" "/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/withoutboats/bpb on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/withoutboats/bpb
[INFO] finished tweaking git repo https://github.com/withoutboats/bpb
[INFO] tweaked toml for git repo https://github.com/withoutboats/bpb written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/withoutboats/bpb already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr] warning: the cargo feature `rename-dependency` is now stable and is no longer necessary to be listed in the manifest
[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" "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" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0a36a9a4ee6d4e7705e44873e6dcc7f6668065c1af78dc87e5ed4bdacefbbc15
[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" "0a36a9a4ee6d4e7705e44873e6dcc7f6668065c1af78dc87e5ed4bdacefbbc15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a36a9a4ee6d4e7705e44873e6dcc7f6668065c1af78dc87e5ed4bdacefbbc15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a36a9a4ee6d4e7705e44873e6dcc7f6668065c1af78dc87e5ed4bdacefbbc15", kill_on_drop: false }`
[INFO] [stdout] 0a36a9a4ee6d4e7705e44873e6dcc7f6668065c1af78dc87e5ed4bdacefbbc15
[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" "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" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 10eb6605c6ae19aa3e0f41557fa3aa988d282571a952e41689bc1302073fca29
[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" "10eb6605c6ae19aa3e0f41557fa3aa988d282571a952e41689bc1302073fca29", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr] warning: the cargo feature `rename-dependency` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr]    Compiling subtle v0.6.3
[INFO] [stderr]    Compiling arrayref v0.3.4
[INFO] [stderr]    Compiling clear_on_drop v0.2.3
[INFO] [stderr]    Compiling proc-macro2 v0.4.6
[INFO] [stderr]    Compiling base64 v0.9.2
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]    Compiling toml v0.4.6
[INFO] [stderr]    Compiling digest v0.7.5
[INFO] [stderr]    Compiling block-buffer v0.3.3
[INFO] [stderr]    Compiling sha2 v0.7.1
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]    Compiling curve25519-dalek v0.18.0
[INFO] [stderr]    Compiling quote v0.6.3
[INFO] [stderr]    Compiling syn v0.14.4
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling ed25519-dalek v0.7.0
[INFO] [stderr]    Compiling pbp v0.4.0
[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/pbp-0.4.0/src/lib.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(rust_2018_preview)]
[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 `pbp`.
[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" "10eb6605c6ae19aa3e0f41557fa3aa988d282571a952e41689bc1302073fca29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10eb6605c6ae19aa3e0f41557fa3aa988d282571a952e41689bc1302073fca29", kill_on_drop: false }`
[INFO] [stdout] 10eb6605c6ae19aa3e0f41557fa3aa988d282571a952e41689bc1302073fca29