[INFO] cloning repository https://github.com/thomwiggers/powerpolynomials
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/thomwiggers/powerpolynomials" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomwiggers%2Fpowerpolynomials"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomwiggers%2Fpowerpolynomials'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 66e737be9dea59a8c840af3fab729f5ea20cadf3
[INFO] checking thomwiggers/powerpolynomials against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthomwiggers%2Fpowerpolynomials" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/thomwiggers/powerpolynomials on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-5/source/Cargo.toml
[INFO] crate git repo https://github.com/thomwiggers/powerpolynomials already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9abacde1805123ecc166a4f7c584123663e8797159ae1a8482f5248f2d76f3b8
[INFO] running `"docker" "start" "-a" "9abacde1805123ecc166a4f7c584123663e8797159ae1a8482f5248f2d76f3b8"`
[INFO] [stderr]     Checking serde v1.0.36
[INFO] [stderr]     Checking dtoa v0.4.2
[INFO] [stderr]     Checking num-traits v0.2.2
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr] error[E0432]: unresolved import `core::nonzero`
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde-1.0.36/src/lib.rs:215:19
[INFO] [stderr]     |
[INFO] [stderr] 215 |     pub use core::nonzero::{NonZero, Zeroable};
[INFO] [stderr]     |                   ^^^^^^^ could not find `nonzero` in `core`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: could not compile `serde`.
[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 `"docker" "inspect" "9abacde1805123ecc166a4f7c584123663e8797159ae1a8482f5248f2d76f3b8"`
[INFO] running `"docker" "rm" "-f" "9abacde1805123ecc166a4f7c584123663e8797159ae1a8482f5248f2d76f3b8"`
[INFO] [stdout] 9abacde1805123ecc166a4f7c584123663e8797159ae1a8482f5248f2d76f3b8