[INFO] fetching crate serializers 0.2.3...
[INFO] checking serializers-0.2.3 against try#d990716b6a1fdde1300748828a9c9e79dfd0b898 for pr-74846
[INFO] extracting crate serializers 0.2.3 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate serializers 0.2.3 on toolchain d990716b6a1fdde1300748828a9c9e79dfd0b898
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serializers 0.2.3
[INFO] finished tweaking crates.io crate serializers 0.2.3
[INFO] tweaked toml for crates.io crate serializers 0.2.3 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4effa37d0b80660d99b2fdd907e16d72b52f8e641fff99f08e4e72c6d474f8e5
[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" "4effa37d0b80660d99b2fdd907e16d72b52f8e641fff99f08e4e72c6d474f8e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4effa37d0b80660d99b2fdd907e16d72b52f8e641fff99f08e4e72c6d474f8e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4effa37d0b80660d99b2fdd907e16d72b52f8e641fff99f08e4e72c6d474f8e5", kill_on_drop: false }`
[INFO] [stdout] 4effa37d0b80660d99b2fdd907e16d72b52f8e641fff99f08e4e72c6d474f8e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ffe1e9872ee14361d09bb55b3d0805bf3ecc22c3c32af08eb74656267a772f70
[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" "ffe1e9872ee14361d09bb55b3d0805bf3ecc22c3c32af08eb74656267a772f70", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling pulldown-cmark v0.1.2
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]     Checking either v1.6.0
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]     Checking syn v0.11.11
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking version-sync v0.5.0
[INFO] [stderr]     Checking serializers v0.2.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.68s
[INFO] running `Command { std: "docker" "inspect" "ffe1e9872ee14361d09bb55b3d0805bf3ecc22c3c32af08eb74656267a772f70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffe1e9872ee14361d09bb55b3d0805bf3ecc22c3c32af08eb74656267a772f70", kill_on_drop: false }`
[INFO] [stdout] ffe1e9872ee14361d09bb55b3d0805bf3ecc22c3c32af08eb74656267a772f70