[INFO] fetching crate lv2-core 3.0.0...
[INFO] checking lv2-core-3.0.0 against try#9c1dcf141bc0875407c4eb36972857bd3db713e2 for pr-81863
[INFO] extracting crate lv2-core 3.0.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate lv2-core 3.0.0 on toolchain 9c1dcf141bc0875407c4eb36972857bd3db713e2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lv2-core 3.0.0
[INFO] finished tweaking crates.io crate lv2-core 3.0.0
[INFO] tweaked toml for crates.io crate lv2-core 3.0.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3db6067ef22d4b16a2ba912192d627df37bbbccc3d6c3b0c465ecdefa86d7626
[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" "3db6067ef22d4b16a2ba912192d627df37bbbccc3d6c3b0c465ecdefa86d7626", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3db6067ef22d4b16a2ba912192d627df37bbbccc3d6c3b0c465ecdefa86d7626", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3db6067ef22d4b16a2ba912192d627df37bbbccc3d6c3b0c465ecdefa86d7626", kill_on_drop: false }`
[INFO] [stdout] 3db6067ef22d4b16a2ba912192d627df37bbbccc3d6c3b0c465ecdefa86d7626
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ac752c2e77ad2b3638fcadb83e00b95c7b2bc2190a7ea1bfdafde9897b49c803
[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" "ac752c2e77ad2b3638fcadb83e00b95c7b2bc2190a7ea1bfdafde9897b49c803", kill_on_drop: false }`
[INFO] [stderr]     Checking lv2-sys v2.0.0
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling urid-derive v0.1.1
[INFO] [stderr]    Compiling lv2-core-derive v2.1.0
[INFO] [stdout] error[E0432]: unresolved import `syn::export`
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/lv2-core-derive-2.1.0/src/feature_collection_derive.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 | use syn::export::Span;
[INFO] [stdout]   |          ^^^^^^ could not find `export` in `syn`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `syn::export`
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/lv2-core-derive-2.1.0/src/port_collection_derive.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 | use syn::export::Span;
[INFO] [stdout]   |          ^^^^^^ could not find `export` in `syn`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lv2-core-derive`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ac752c2e77ad2b3638fcadb83e00b95c7b2bc2190a7ea1bfdafde9897b49c803", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac752c2e77ad2b3638fcadb83e00b95c7b2bc2190a7ea1bfdafde9897b49c803", kill_on_drop: false }`
[INFO] [stdout] ac752c2e77ad2b3638fcadb83e00b95c7b2bc2190a7ea1bfdafde9897b49c803