[INFO] fetching crate cereal_macros 0.3.5...
[INFO] testing cereal_macros-0.3.5 against 1.49.0 for beta-1.50-1
[INFO] extracting crate cereal_macros 0.3.5 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate cereal_macros 0.3.5 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cereal_macros 0.3.5
[INFO] finished tweaking crates.io crate cereal_macros 0.3.5
[INFO] tweaked toml for crates.io crate cereal_macros 0.3.5 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "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] 1d85100a9ce69674887b63893cbeb46ee03bd2bf9c1012ceb166b3005edb0e3f
[INFO] running `Command { std: "docker" "start" "-a" "1d85100a9ce69674887b63893cbeb46ee03bd2bf9c1012ceb166b3005edb0e3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1d85100a9ce69674887b63893cbeb46ee03bd2bf9c1012ceb166b3005edb0e3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d85100a9ce69674887b63893cbeb46ee03bd2bf9c1012ceb166b3005edb0e3f", kill_on_drop: false }`
[INFO] [stdout] 1d85100a9ce69674887b63893cbeb46ee03bd2bf9c1012ceb166b3005edb0e3f
[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=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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "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] 1395a4b5df218b8b44ae772cd99be25dd354c920057ccb5659cf17bc6a643e25
[INFO] running `Command { std: "docker" "start" "-a" "1395a4b5df218b8b44ae772cd99be25dd354c920057ccb5659cf17bc6a643e25", kill_on_drop: false }`
[INFO] [stderr]    Compiling cereal_macros v0.3.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/plugin.rs:2:42
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(box_syntax, plugin_registrar, quote, rustc_private)]
[INFO] [stdout]   |                                          ^^^^^ feature has been removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `rustc_plugin`
[INFO] [stdout]  --> src/plugin.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate rustc_plugin;
[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 `cereal_macros`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "1395a4b5df218b8b44ae772cd99be25dd354c920057ccb5659cf17bc6a643e25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1395a4b5df218b8b44ae772cd99be25dd354c920057ccb5659cf17bc6a643e25", kill_on_drop: false }`
[INFO] [stdout] 1395a4b5df218b8b44ae772cd99be25dd354c920057ccb5659cf17bc6a643e25