[INFO] fetching crate rustcov 0.0.0...
[INFO] testing rustcov-0.0.0 against try#8262275854dc0e5381c9d42d56257d94932c5a87 for pr-90799
[INFO] extracting crate rustcov 0.0.0 into /workspace/builds/worker-49/source
[INFO] validating manifest of crates.io crate rustcov 0.0.0 on toolchain 8262275854dc0e5381c9d42d56257d94932c5a87
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-49/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "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" "+8262275854dc0e5381c9d42d56257d94932c5a87" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4526230659b286c8efb889235cdb8f02b49874dfa36c01e489f6d19bfafd978f
[INFO] running `Command { std: "docker" "start" "-a" "4526230659b286c8efb889235cdb8f02b49874dfa36c01e489f6d19bfafd978f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4526230659b286c8efb889235cdb8f02b49874dfa36c01e489f6d19bfafd978f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4526230659b286c8efb889235cdb8f02b49874dfa36c01e489f6d19bfafd978f", kill_on_drop: false }`
[INFO] [stdout] 4526230659b286c8efb889235cdb8f02b49874dfa36c01e489f6d19bfafd978f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0aa0b2830c3fb80311797abc519875f4bfb7d1748ca9c067b81fbddfde9ec5bf
[INFO] running `Command { std: "docker" "start" "-a" "0aa0b2830c3fb80311797abc519875f4bfb7d1748ca9c067b81fbddfde9ec5bf", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rustcov v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.72s
[INFO] running `Command { std: "docker" "inspect" "0aa0b2830c3fb80311797abc519875f4bfb7d1748ca9c067b81fbddfde9ec5bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0aa0b2830c3fb80311797abc519875f4bfb7d1748ca9c067b81fbddfde9ec5bf", kill_on_drop: false }`
[INFO] [stdout] 0aa0b2830c3fb80311797abc519875f4bfb7d1748ca9c067b81fbddfde9ec5bf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f03bae0315562803686ce336a0d9bd15f7ab89c5f16e8e95f8f9393febd4e545
[INFO] running `Command { std: "docker" "start" "-a" "f03bae0315562803686ce336a0d9bd15f7ab89c5f16e8e95f8f9393febd4e545", kill_on_drop: false }`
[INFO] [stderr]    Compiling 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` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f03bae0315562803686ce336a0d9bd15f7ab89c5f16e8e95f8f9393febd4e545", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f03bae0315562803686ce336a0d9bd15f7ab89c5f16e8e95f8f9393febd4e545", kill_on_drop: false }`
[INFO] [stdout] f03bae0315562803686ce336a0d9bd15f7ab89c5f16e8e95f8f9393febd4e545