[INFO] crate rustcov 0.0.0 is already in cache
[INFO] checking rustcov-0.0.0 against beta-2019-10-27 for pr-65897
[INFO] extracting crate rustcov 0.0.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate rustcov 0.0.0 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 rustcov 0.0.0
[INFO] finished tweaking crates.io crate rustcov 0.0.0
[INFO] tweaked toml for crates.io crate rustcov 0.0.0 written to /workspace/builds/worker-9/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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] bbe9dfe6b73e3f01292c12906618c6fc7766a5678b65ce3d9119f31819f54b00
[INFO] running `"docker" "start" "-a" "bbe9dfe6b73e3f01292c12906618c6fc7766a5678b65ce3d9119f31819f54b00"`
[INFO] [stderr]     Checking rustcov v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0457]: plugin `rustcov` only found in rlib format, but must be available in dylib format
[INFO] [stderr]  --> examples/plugin.rs:2:11
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![plugin(rustcov)]
[INFO] [stderr]   |           ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> examples/plugin.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(plugin)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `plugin`
[INFO] [stderr]   --> examples/plugin.rs:1:1
[INFO] [stderr]    |
[INFO] [stderr] 1  | / #![feature(plugin)]
[INFO] [stderr] 2  | | #![plugin(rustcov)]
[INFO] [stderr] 3  | |
[INFO] [stderr] 4  | | fn fizzbuzz(n: i32) -> String {
[INFO] [stderr] ...  |
[INFO] [stderr] 14 | |     assert_eq!(fizzbuzz(3), "fizz");
[INFO] [stderr] 15 | | }
[INFO] [stderr]    | |_^ consider adding a `main` function to `examples/plugin.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0601.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `rustcov`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "bbe9dfe6b73e3f01292c12906618c6fc7766a5678b65ce3d9119f31819f54b00"`
[INFO] running `"docker" "rm" "-f" "bbe9dfe6b73e3f01292c12906618c6fc7766a5678b65ce3d9119f31819f54b00"`
[INFO] [stdout] bbe9dfe6b73e3f01292c12906618c6fc7766a5678b65ce3d9119f31819f54b00