[INFO] fetching crate panic-write 0.1.0...
[INFO] testing panic-write-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate panic-write 0.1.0 into /workspace/builds/worker-52/source
[INFO] validating manifest of crates.io crate panic-write 0.1.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate panic-write 0.1.0
[INFO] finished tweaking crates.io crate panic-write 0.1.0
[INFO] tweaked toml for crates.io crate panic-write 0.1.0 written to /workspace/builds/worker-52/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bac30a3059c6c2d13fba7a16c0db734cb32319fd0dce350a9686af6c4b3e745e
[INFO] running `Command { std: "docker" "start" "-a" "bac30a3059c6c2d13fba7a16c0db734cb32319fd0dce350a9686af6c4b3e745e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bac30a3059c6c2d13fba7a16c0db734cb32319fd0dce350a9686af6c4b3e745e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bac30a3059c6c2d13fba7a16c0db734cb32319fd0dce350a9686af6c4b3e745e", kill_on_drop: false }`
[INFO] [stdout] bac30a3059c6c2d13fba7a16c0db734cb32319fd0dce350a9686af6c4b3e745e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 59485862af8d049055843b6e01d88e8dcae5fe2454e4ea30845646cf09728579
[INFO] running `Command { std: "docker" "start" "-a" "59485862af8d049055843b6e01d88e8dcae5fe2454e4ea30845646cf09728579", kill_on_drop: false }`
[INFO] [stderr]    Compiling panic-write v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "59485862af8d049055843b6e01d88e8dcae5fe2454e4ea30845646cf09728579", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59485862af8d049055843b6e01d88e8dcae5fe2454e4ea30845646cf09728579", kill_on_drop: false }`
[INFO] [stdout] 59485862af8d049055843b6e01d88e8dcae5fe2454e4ea30845646cf09728579
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-52/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dac49032f797175ebe87178f1bd3f0df842e4d9abc9db6d6c3cd58e6f63fdcf2
[INFO] running `Command { std: "docker" "start" "-a" "dac49032f797175ebe87178f1bd3f0df842e4d9abc9db6d6c3cd58e6f63fdcf2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling panic-write v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0152]: found duplicate lang item `panic_impl`
[INFO] [stdout]   --> src/lib.rs:91:1
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn panic(info: &PanicInfo) -> ! {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the lang item is first defined in crate `std` (which `test` depends on)
[INFO] [stdout]    = note: first definition in `std` loaded from /opt/rustwide/rustup-home/toolchains/1.55.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-008055cc7d873802.so, /opt/rustwide/rustup-home/toolchains/1.55.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-008055cc7d873802.rlib
[INFO] [stdout]    = note: second definition in the local crate (`panic_write`)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0152`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `panic-write` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "dac49032f797175ebe87178f1bd3f0df842e4d9abc9db6d6c3cd58e6f63fdcf2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dac49032f797175ebe87178f1bd3f0df842e4d9abc9db6d6c3cd58e6f63fdcf2", kill_on_drop: false }`
[INFO] [stdout] dac49032f797175ebe87178f1bd3f0df842e4d9abc9db6d6c3cd58e6f63fdcf2