[INFO] updating cached repository https://github.com/thomwiggers/powerpolynomials
[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] 66e737be9dea59a8c840af3fab729f5ea20cadf3
[INFO] testing thomwiggers/powerpolynomials against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomwiggers%2Fpowerpolynomials" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/thomwiggers/powerpolynomials on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/thomwiggers/powerpolynomials
[INFO] finished tweaking git repo https://github.com/thomwiggers/powerpolynomials
[INFO] tweaked toml for git repo https://github.com/thomwiggers/powerpolynomials written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/thomwiggers/powerpolynomials already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 86c6edf5f775275183b3aebcec037c3238a28a842d83e54283b70b80e8b40b1f
[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" "86c6edf5f775275183b3aebcec037c3238a28a842d83e54283b70b80e8b40b1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86c6edf5f775275183b3aebcec037c3238a28a842d83e54283b70b80e8b40b1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86c6edf5f775275183b3aebcec037c3238a28a842d83e54283b70b80e8b40b1f", kill_on_drop: false }`
[INFO] [stdout] 86c6edf5f775275183b3aebcec037c3238a28a842d83e54283b70b80e8b40b1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 61896a4cfb6a7750570336bea4afd03d35a67a79c3185ed2472e84a696bea8f5
[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" "61896a4cfb6a7750570336bea4afd03d35a67a79c3185ed2472e84a696bea8f5", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.36
[INFO] [stderr]    Compiling num-traits v0.2.2
[INFO] [stdout] error[E0432]: unresolved import `core::nonzero`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde-1.0.36/src/lib.rs:215:19
[INFO] [stdout]     |
[INFO] [stdout] 215 |     pub use core::nonzero::{NonZero, Zeroable};
[INFO] [stdout]     |                   ^^^^^^^ could not find `nonzero` in `core`
[INFO] [stdout] 
[INFO] [stdout] 
[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/serde-1.0.36/src/lib.rs:89:35
[INFO] [stdout]    |
[INFO] [stdout] 89 | #![cfg_attr(feature = "unstable", feature(nonzero, specialization))]
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "61896a4cfb6a7750570336bea4afd03d35a67a79c3185ed2472e84a696bea8f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61896a4cfb6a7750570336bea4afd03d35a67a79c3185ed2472e84a696bea8f5", kill_on_drop: false }`
[INFO] [stdout] 61896a4cfb6a7750570336bea4afd03d35a67a79c3185ed2472e84a696bea8f5