[INFO] cloning repository https://github.com/Cynlic/rock-try
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Cynlic/rock-try" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCynlic%2Frock-try", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCynlic%2Frock-try'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f12760d35c0cf383c5d880cbf891d04db8a7cf40
[INFO] testing Cynlic/rock-try 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%2FCynlic%2Frock-try" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Cynlic/rock-try 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/Cynlic/rock-try
[INFO] finished tweaking git repo https://github.com/Cynlic/rock-try
[INFO] tweaked toml for git repo https://github.com/Cynlic/rock-try written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/Cynlic/rock-try 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 time v0.1.38
[INFO] [stderr]   Downloaded toml v0.4.5
[INFO] [stderr]   Downloaded pear_codegen v0.0.10
[INFO] [stderr]   Downloaded num_cpus v1.7.0
[INFO] [stderr]   Downloaded httparse v1.2.3
[INFO] [stderr]   Downloaded smallvec v0.4.4
[INFO] [stderr]   Downloaded maud_htmlescape v0.17.0
[INFO] [stderr]   Downloaded either v1.2.0
[INFO] [stderr]   Downloaded byteorder v1.1.0
[INFO] [stderr]   Downloaded serde v1.0.15
[INFO] [stderr]   Downloaded rocket v0.3.3
[INFO] [stderr]   Downloaded coco v0.1.1
[INFO] [stderr]   Downloaded cookie v0.9.1
[INFO] [stderr]   Downloaded rocket_codegen v0.3.3
[INFO] [stderr]   Downloaded isatty v0.1.3
[INFO] [stderr]   Downloaded rayon-core v1.2.1
[INFO] [stderr]   Downloaded yansi v0.3.4
[INFO] [stderr]   Downloaded scopeguard v0.3.2
[INFO] [stderr]   Downloaded lazy_static v0.2.9
[INFO] [stderr]   Downloaded state v0.3.2
[INFO] [stderr]   Downloaded memchr v1.0.1
[INFO] [stderr]   Downloaded url v1.5.1
[INFO] [stderr]   Downloaded pear v0.0.10
[INFO] [stderr]   Downloaded futures v0.1.16
[INFO] [stderr]   Downloaded percent-encoding v1.0.0
[INFO] [stderr]   Downloaded redox_syscall v0.1.31
[INFO] [stderr]   Downloaded ordermap v0.2.12
[INFO] [stderr]   Downloaded maud_macros v0.17.1
[INFO] [stderr]   Downloaded literalext v0.1.1
[INFO] [stderr]   Downloaded maud v0.17.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 5c1a92ba0ff1ceeeed8854b21fc045e1352a0877ed448c9a0563fa69e5889c30
[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" "5c1a92ba0ff1ceeeed8854b21fc045e1352a0877ed448c9a0563fa69e5889c30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5c1a92ba0ff1ceeeed8854b21fc045e1352a0877ed448c9a0563fa69e5889c30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c1a92ba0ff1ceeeed8854b21fc045e1352a0877ed448c9a0563fa69e5889c30", kill_on_drop: false }`
[INFO] [stdout] 5c1a92ba0ff1ceeeed8854b21fc045e1352a0877ed448c9a0563fa69e5889c30
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] dda837fac54475414d24a3752b47f0734b159c1a732e41b2ae4e663fb950edf2
[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" "dda837fac54475414d24a3752b47f0734b159c1a732e41b2ae4e663fb950edf2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.31
[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 either v1.2.0
[INFO] [stderr]    Compiling lazy_static v0.2.9
[INFO] [stderr]    Compiling futures v0.1.16
[INFO] [stderr]    Compiling matches v0.1.6
[INFO] [stderr]    Compiling yansi v0.3.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.5
[INFO] [stderr]    Compiling byteorder v1.1.0
[INFO] [stderr]    Compiling percent-encoding v1.0.0
[INFO] [stderr]    Compiling log v0.3.8
[INFO] [stderr]    Compiling untrusted v0.5.1
[INFO] [stderr]    Compiling serde v1.0.15
[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-0.3.4/src/lib.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature="nightly", feature(const_atomic_bool_new))]
[INFO] [stdout]   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling smallvec v0.4.4
[INFO] [stderr]    Compiling pear v0.0.10
[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" "dda837fac54475414d24a3752b47f0734b159c1a732e41b2ae4e663fb950edf2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dda837fac54475414d24a3752b47f0734b159c1a732e41b2ae4e663fb950edf2", kill_on_drop: false }`
[INFO] [stdout] dda837fac54475414d24a3752b47f0734b159c1a732e41b2ae4e663fb950edf2