[INFO] crate rustcov 0.0.0 is already in cache
[INFO] checking rustcov-0.0.0 against try#0ab79c4b48ad19260fa46623f452c1b403a360e8 for pr-74315
[INFO] extracting crate rustcov 0.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate rustcov 0.0.0 on toolchain 0ab79c4b48ad19260fa46623f452c1b403a360e8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "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-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0b4053cd55a54f9e268c48b9de379e789d8595b2ff531051ba52f2891f8aabf3
[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" "0b4053cd55a54f9e268c48b9de379e789d8595b2ff531051ba52f2891f8aabf3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b4053cd55a54f9e268c48b9de379e789d8595b2ff531051ba52f2891f8aabf3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b4053cd55a54f9e268c48b9de379e789d8595b2ff531051ba52f2891f8aabf3", kill_on_drop: false }`
[INFO] [stdout] 0b4053cd55a54f9e268c48b9de379e789d8595b2ff531051ba52f2891f8aabf3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] de7a7c1926d481fb060f510dcef19cb6f864330cb9b4170b248dcfdbe9760224
[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" "de7a7c1926d481fb060f510dcef19cb6f864330cb9b4170b248dcfdbe9760224", kill_on_drop: false }`
[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] warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
[INFO] [stdout]  --> examples/plugin.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![plugin(rustcov)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `plugin`
[INFO] [stdout]   --> examples/plugin.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout] 1  | / #![feature(plugin)]
[INFO] [stdout] 2  | | #![plugin(rustcov)]
[INFO] [stdout] 3  | |
[INFO] [stdout] 4  | | fn fizzbuzz(n: i32) -> String {
[INFO] [stdout] ...  |
[INFO] [stdout] 14 | |     assert_eq!(fizzbuzz(3), "fizz");
[INFO] [stdout] 15 | | }
[INFO] [stdout]    | |_^ consider adding a `main` function to `examples/plugin.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[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" "de7a7c1926d481fb060f510dcef19cb6f864330cb9b4170b248dcfdbe9760224", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de7a7c1926d481fb060f510dcef19cb6f864330cb9b4170b248dcfdbe9760224", kill_on_drop: false }`
[INFO] [stdout] de7a7c1926d481fb060f510dcef19cb6f864330cb9b4170b248dcfdbe9760224