[INFO] fetching crate concat_bytes 0.1.0...
[INFO] testing concat_bytes-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate concat_bytes 0.1.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate concat_bytes 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 concat_bytes 0.1.0
[INFO] finished tweaking crates.io crate concat_bytes 0.1.0
[INFO] tweaked toml for crates.io crate concat_bytes 0.1.0 written to /workspace/builds/worker-14/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] 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-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 7f35af055d3f3572eb684f18deff069d57fa69442e0b3f6eb1ca964f702c86ba
[INFO] running `Command { std: "docker" "start" "-a" "7f35af055d3f3572eb684f18deff069d57fa69442e0b3f6eb1ca964f702c86ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7f35af055d3f3572eb684f18deff069d57fa69442e0b3f6eb1ca964f702c86ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f35af055d3f3572eb684f18deff069d57fa69442e0b3f6eb1ca964f702c86ba", kill_on_drop: false }`
[INFO] [stdout] 7f35af055d3f3572eb684f18deff069d57fa69442e0b3f6eb1ca964f702c86ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] b7279311c63ed293a94e68be42083751851e8bc682e71573768803646c3669b6
[INFO] running `Command { std: "docker" "start" "-a" "b7279311c63ed293a94e68be42083751851e8bc682e71573768803646c3669b6", kill_on_drop: false }`
[INFO] [stderr]    Compiling concat_bytes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0463]: can't find crate for `syntax`
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate syntax;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^ can't find crate
[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 E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `concat_bytes` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "b7279311c63ed293a94e68be42083751851e8bc682e71573768803646c3669b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7279311c63ed293a94e68be42083751851e8bc682e71573768803646c3669b6", kill_on_drop: false }`
[INFO] [stdout] b7279311c63ed293a94e68be42083751851e8bc682e71573768803646c3669b6