[INFO] fetching crate tmux_plugin 0.0.1...
[INFO] checking tmux_plugin-0.0.1 against beta for pr-78714
[INFO] extracting crate tmux_plugin 0.0.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate tmux_plugin 0.0.1 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tmux_plugin 0.0.1
[INFO] finished tweaking crates.io crate tmux_plugin 0.0.1
[INFO] tweaked toml for crates.io crate tmux_plugin 0.0.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dba700e12efdf2d4c6da85d0cb7e90c73f5f2a2dd41d3dba6d2761f7288a47c2
[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" "dba700e12efdf2d4c6da85d0cb7e90c73f5f2a2dd41d3dba6d2761f7288a47c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dba700e12efdf2d4c6da85d0cb7e90c73f5f2a2dd41d3dba6d2761f7288a47c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dba700e12efdf2d4c6da85d0cb7e90c73f5f2a2dd41d3dba6d2761f7288a47c2", kill_on_drop: false }`
[INFO] [stdout] dba700e12efdf2d4c6da85d0cb7e90c73f5f2a2dd41d3dba6d2761f7288a47c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--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] c228a8f14baa3c3ab4ffdf6a1f890df3368724aae9309c3d8c01bc3cd427cb0a
[INFO] running `Command { std: "docker" "start" "-a" "c228a8f14baa3c3ab4ffdf6a1f890df3368724aae9309c3d8c01bc3cd427cb0a", kill_on_drop: false }`
[INFO] [stderr]     Checking tmux_plugin v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.18s
[INFO] running `Command { std: "docker" "inspect" "c228a8f14baa3c3ab4ffdf6a1f890df3368724aae9309c3d8c01bc3cd427cb0a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c228a8f14baa3c3ab4ffdf6a1f890df3368724aae9309c3d8c01bc3cd427cb0a", kill_on_drop: false }`
[INFO] [stdout] c228a8f14baa3c3ab4ffdf6a1f890df3368724aae9309c3d8c01bc3cd427cb0a