[INFO] fetching crate rustcov 0.0.0...
[INFO] checking rustcov-0.0.0 against master#d902752866cbbdb331e3cf28ff6bba86ab0f6c62 for pr-77271
[INFO] extracting crate rustcov 0.0.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate rustcov 0.0.0 on toolchain d902752866cbbdb331e3cf28ff6bba86ab0f6c62
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d902752866cbbdb331e3cf28ff6bba86ab0f6c62" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d902752866cbbdb331e3cf28ff6bba86ab0f6c62" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d902752866cbbdb331e3cf28ff6bba86ab0f6c62" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d902752866cbbdb331e3cf28ff6bba86ab0f6c62" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 08bcb2c3f68cd1a4d6c56b3f67161cb416b27e4ee6bc5138331a38e4205ecbbb
[INFO] running `Command { std: "docker" "start" "-a" "08bcb2c3f68cd1a4d6c56b3f67161cb416b27e4ee6bc5138331a38e4205ecbbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08bcb2c3f68cd1a4d6c56b3f67161cb416b27e4ee6bc5138331a38e4205ecbbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08bcb2c3f68cd1a4d6c56b3f67161cb416b27e4ee6bc5138331a38e4205ecbbb", kill_on_drop: false }`
[INFO] [stdout] 08bcb2c3f68cd1a4d6c56b3f67161cb416b27e4ee6bc5138331a38e4205ecbbb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=forbid" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d902752866cbbdb331e3cf28ff6bba86ab0f6c62" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 519cc23b185cbba6ef3eda0d3d6e51ddf4ecf3d197febd2a2a4d2133a7748b98
[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" "519cc23b185cbba6ef3eda0d3d6e51ddf4ecf3d197febd2a2a4d2133a7748b98", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rustcov v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0457]: plugin `rustcov` only found in rlib format, but must be available in dylib format
[INFO] [stdout]  --> examples/plugin.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![plugin(rustcov)]
[INFO] [stdout]   |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustcov`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "519cc23b185cbba6ef3eda0d3d6e51ddf4ecf3d197febd2a2a4d2133a7748b98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "519cc23b185cbba6ef3eda0d3d6e51ddf4ecf3d197febd2a2a4d2133a7748b98", kill_on_drop: false }`
[INFO] [stdout] 519cc23b185cbba6ef3eda0d3d6e51ddf4ecf3d197febd2a2a4d2133a7748b98