[INFO] fetching crate kwarg_macros 0.0.6...
[INFO] testing kwarg_macros-0.0.6 against 1.55.0 for beta-1.56-1
[INFO] extracting crate kwarg_macros 0.0.6 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate kwarg_macros 0.0.6 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 kwarg_macros 0.0.6
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate kwarg_macros 0.0.6
[INFO] tweaked toml for crates.io crate kwarg_macros 0.0.6 written to /workspace/builds/worker-5/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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 23fe67da8957b093cf686fdf3c37fa813a60d3f7975a69c24f6ddf68d6e9de77
[INFO] running `Command { std: "docker" "start" "-a" "23fe67da8957b093cf686fdf3c37fa813a60d3f7975a69c24f6ddf68d6e9de77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "23fe67da8957b093cf686fdf3c37fa813a60d3f7975a69c24f6ddf68d6e9de77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23fe67da8957b093cf686fdf3c37fa813a60d3f7975a69c24f6ddf68d6e9de77", kill_on_drop: false }`
[INFO] [stdout] 23fe67da8957b093cf686fdf3c37fa813a60d3f7975a69c24f6ddf68d6e9de77
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 151a256f32f8f6a32a854159514390284c84c875b4220da6a03012ff471ad747
[INFO] running `Command { std: "docker" "start" "-a" "151a256f32f8f6a32a854159514390284c84c875b4220da6a03012ff471ad747", kill_on_drop: false }`
[INFO] [stderr]    Compiling kwarg_macros v0.0.6 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(quote, plugin_registrar)]
[INFO] [stdout]   |            ^^^^^ feature has been removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `syntax`
[INFO] [stdout]   --> src/lib.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | extern crate syntax;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0463, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kwarg_macros` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "151a256f32f8f6a32a854159514390284c84c875b4220da6a03012ff471ad747", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "151a256f32f8f6a32a854159514390284c84c875b4220da6a03012ff471ad747", kill_on_drop: false }`
[INFO] [stdout] 151a256f32f8f6a32a854159514390284c84c875b4220da6a03012ff471ad747