[INFO] cloning repository https://github.com/brentvatne/simple-rust-push-server-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/brentvatne/simple-rust-push-server-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrentvatne%2Fsimple-rust-push-server-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrentvatne%2Fsimple-rust-push-server-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 41189c604cbe789858b03de8cd2317814dca2bcc
[INFO] testing brentvatne/simple-rust-push-server-example against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrentvatne%2Fsimple-rust-push-server-example" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/brentvatne/simple-rust-push-server-example on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/brentvatne/simple-rust-push-server-example
[INFO] finished tweaking git repo https://github.com/brentvatne/simple-rust-push-server-example
[INFO] tweaked toml for git repo https://github.com/brentvatne/simple-rust-push-server-example written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/brentvatne/simple-rust-push-server-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ordermap v0.2.10
[INFO] [stderr]   Downloaded gcc v0.3.52
[INFO] [stderr]   Downloaded smallvec v0.4.2
[INFO] [stderr]   Downloaded rocket_contrib v0.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8ea711d57763a936b482a641a43a40044b476dde14355611fc29f747cdf92221
[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" "8ea711d57763a936b482a641a43a40044b476dde14355611fc29f747cdf92221", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ea711d57763a936b482a641a43a40044b476dde14355611fc29f747cdf92221", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ea711d57763a936b482a641a43a40044b476dde14355611fc29f747cdf92221", kill_on_drop: false }`
[INFO] [stdout] 8ea711d57763a936b482a641a43a40044b476dde14355611fc29f747cdf92221
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d57c029d08e8d6840e1ad5f4e6e5f839074e9aa440690b1308499d87983cbae7
[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" "d57c029d08e8d6840e1ad5f4e6e5f839074e9aa440690b1308499d87983cbae7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.29
[INFO] [stderr]    Compiling futures v0.1.14
[INFO] [stderr]    Compiling gcc v0.3.52
[INFO] [stderr]    Compiling byteorder v1.1.0
[INFO] [stderr]    Compiling log v0.3.8
[INFO] [stderr]    Compiling version_check v0.1.3
[INFO] [stderr]    Compiling scopeguard v0.3.2
[INFO] [stderr]    Compiling rayon-core v1.2.1
[INFO] [stderr]    Compiling percent-encoding v1.0.0
[INFO] [stderr]    Compiling either v1.1.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.5
[INFO] [stderr]    Compiling pkg-config v0.3.9
[INFO] [stderr]    Compiling lazycell v0.5.1
[INFO] [stderr]    Compiling serde v1.0.11
[INFO] [stderr]    Compiling yansi v0.3.3
[INFO] [stderr]    Compiling httparse v1.2.3
[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/yansi-0.3.3/src/lib.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature="nightly", feature(const_fn))]
[INFO] [stdout]   |                                ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling scoped-tls v0.1.0
[INFO] [stderr]    Compiling openssl v0.9.17
[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 `yansi`
[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" "d57c029d08e8d6840e1ad5f4e6e5f839074e9aa440690b1308499d87983cbae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d57c029d08e8d6840e1ad5f4e6e5f839074e9aa440690b1308499d87983cbae7", kill_on_drop: false }`
[INFO] [stdout] d57c029d08e8d6840e1ad5f4e6e5f839074e9aa440690b1308499d87983cbae7