[INFO] cloning repository https://github.com/hio/rusk
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hio/rusk" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhio%2Frusk", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhio%2Frusk'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8eb863c911dc93c9eb698a5232833cd1c8f4930e
[INFO] checking hio/rusk against master#36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923 for pr-81863
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhio%2Frusk" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hio/rusk on toolchain 36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hio/rusk
[INFO] finished tweaking git repo https://github.com/hio/rusk
[INFO] tweaked toml for git repo https://github.com/hio/rusk written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/hio/rusk already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f5e568f26af631f58fb2fca88eced77f7d8545d4b871276d8ded076f7b68f326
[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" "f5e568f26af631f58fb2fca88eced77f7d8545d4b871276d8ded076f7b68f326", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5e568f26af631f58fb2fca88eced77f7d8545d4b871276d8ded076f7b68f326", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5e568f26af631f58fb2fca88eced77f7d8545d4b871276d8ded076f7b68f326", kill_on_drop: false }`
[INFO] [stdout] f5e568f26af631f58fb2fca88eced77f7d8545d4b871276d8ded076f7b68f326
[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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "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] 549192a017f025e0d7d23c57619ecba37fb84c0a0a143827be00adf3ee7c7caf
[INFO] running `Command { std: "docker" "start" "-a" "549192a017f025e0d7d23c57619ecba37fb84c0a0a143827be00adf3ee7c7caf", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling serde v1.0.103
[INFO] [stderr]    Compiling serde_derive v1.0.103
[INFO] [stderr]     Checking serde_json v1.0.44
[INFO] [stderr]     Checking rusk v0.1.18 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `prefix_op`
[INFO] [stdout]    --> src/parser.rs:588:2
[INFO] [stdout]     |
[INFO] [stdout] 588 |     prefix_op: bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `prefix_op`
[INFO] [stdout]    --> src/parser.rs:588:2
[INFO] [stdout]     |
[INFO] [stdout] 588 |     prefix_op: bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 41.49s
[INFO] running `Command { std: "docker" "inspect" "549192a017f025e0d7d23c57619ecba37fb84c0a0a143827be00adf3ee7c7caf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "549192a017f025e0d7d23c57619ecba37fb84c0a0a143827be00adf3ee7c7caf", kill_on_drop: false }`
[INFO] [stdout] 549192a017f025e0d7d23c57619ecba37fb84c0a0a143827be00adf3ee7c7caf