[INFO] fetching crate contracts 0.6.0...
[INFO] checking contracts-0.6.0 against try#b2f80f6008cdafc35b4472bd46afa16cc6b0cd63 for pr-79470
[INFO] extracting crate contracts 0.6.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate contracts 0.6.0 on toolchain b2f80f6008cdafc35b4472bd46afa16cc6b0cd63
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate contracts 0.6.0
[INFO] finished tweaking crates.io crate contracts 0.6.0
[INFO] tweaked toml for crates.io crate contracts 0.6.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate contracts 0.6.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded quote v1.0.4
[INFO] [stderr]   Downloaded proc-macro2 v1.0.12
[INFO] [stderr]   Downloaded syn v1.0.19
[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" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b0127eccbad6faa8c0eee9462593eb39c01277ca89817a6f090d7946a2d3968f
[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" "b0127eccbad6faa8c0eee9462593eb39c01277ca89817a6f090d7946a2d3968f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b0127eccbad6faa8c0eee9462593eb39c01277ca89817a6f090d7946a2d3968f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0127eccbad6faa8c0eee9462593eb39c01277ca89817a6f090d7946a2d3968f", kill_on_drop: false }`
[INFO] [stdout] b0127eccbad6faa8c0eee9462593eb39c01277ca89817a6f090d7946a2d3968f
[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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1d3b4df5eea0aa9226461679cd6b2e0b8563ae53ff7c58e4256454d2cf645aa7
[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" "1d3b4df5eea0aa9226461679cd6b2e0b8563ae53ff7c58e4256454d2cf645aa7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]    Compiling syn v1.0.19
[INFO] [stderr]     Checking unicode-xid v0.2.0
[INFO] [stderr]     Checking quote v1.0.4
[INFO] [stderr]     Checking contracts v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.73s
[INFO] running `Command { std: "docker" "inspect" "1d3b4df5eea0aa9226461679cd6b2e0b8563ae53ff7c58e4256454d2cf645aa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d3b4df5eea0aa9226461679cd6b2e0b8563ae53ff7c58e4256454d2cf645aa7", kill_on_drop: false }`
[INFO] [stdout] 1d3b4df5eea0aa9226461679cd6b2e0b8563ae53ff7c58e4256454d2cf645aa7