[INFO] fetching crate cstring 0.0.4...
[INFO] checking cstring-0.0.4 against beta-2019-10-27 for pr-65897
[INFO] extracting crate cstring 0.0.4 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate cstring 0.0.4 on toolchain beta-2019-10-27
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate cstring 0.0.4
[INFO] finished tweaking crates.io crate cstring 0.0.4
[INFO] tweaked toml for crates.io crate cstring 0.0.4 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=allow" "-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" "+beta-2019-10-27" "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] 559f1416b91cc467d08b5c03e913ca1793e6a8176c50160244a9f51f461102a1
[INFO] running `"docker" "start" "-a" "559f1416b91cc467d08b5c03e913ca1793e6a8176c50160244a9f51f461102a1"`
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking cstring v0.0.4 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0468]: an `extern crate` loading macros must be at the crate root
[INFO] [stderr]   --> src/cstr_core.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | extern crate std;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0468`.
[INFO] [stderr] error: could not compile `cstring`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "559f1416b91cc467d08b5c03e913ca1793e6a8176c50160244a9f51f461102a1"`
[INFO] running `"docker" "rm" "-f" "559f1416b91cc467d08b5c03e913ca1793e6a8176c50160244a9f51f461102a1"`
[INFO] [stdout] 559f1416b91cc467d08b5c03e913ca1793e6a8176c50160244a9f51f461102a1