[INFO] fetching crate iref 1.4.3...
[INFO] checking iref-1.4.3 against master#31ee872db5aae4750e3da1ca4ed1523c4356947f for pr-78461
[INFO] extracting crate iref 1.4.3 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate iref 1.4.3 on toolchain 31ee872db5aae4750e3da1ca4ed1523c4356947f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+31ee872db5aae4750e3da1ca4ed1523c4356947f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate iref 1.4.3
[INFO] finished tweaking crates.io crate iref 1.4.3
[INFO] tweaked toml for crates.io crate iref 1.4.3 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate iref 1.4.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+31ee872db5aae4750e3da1ca4ed1523c4356947f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+31ee872db5aae4750e3da1ca4ed1523c4356947f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 67b7416f0f62aad84fad32b0854a482b71ad671b9b7cd7af68995e984a8c9252
[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" "67b7416f0f62aad84fad32b0854a482b71ad671b9b7cd7af68995e984a8c9252", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "67b7416f0f62aad84fad32b0854a482b71ad671b9b7cd7af68995e984a8c9252", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "67b7416f0f62aad84fad32b0854a482b71ad671b9b7cd7af68995e984a8c9252", kill_on_drop: false }`
[INFO] [stdout] 67b7416f0f62aad84fad32b0854a482b71ad671b9b7cd7af68995e984a8c9252
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+31ee872db5aae4750e3da1ca4ed1523c4356947f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa01dc98b7fc1396a137ce47f9c88a69ae9c326f125bab15e1d77900cf415d60
[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" "fa01dc98b7fc1396a137ce47f9c88a69ae9c326f125bab15e1d77900cf415d60", kill_on_drop: false }`
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]     Checking pct-str v1.1.0
[INFO] [stderr]     Checking iref v1.4.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.87s
[INFO] running `Command { std: "docker" "inspect" "fa01dc98b7fc1396a137ce47f9c88a69ae9c326f125bab15e1d77900cf415d60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa01dc98b7fc1396a137ce47f9c88a69ae9c326f125bab15e1d77900cf415d60", kill_on_drop: false }`
[INFO] [stdout] fa01dc98b7fc1396a137ce47f9c88a69ae9c326f125bab15e1d77900cf415d60