[INFO] fetching crate fuzzcheck_mutators 0.3.0...
[INFO] checking fuzzcheck_mutators-0.3.0 against try#d990716b6a1fdde1300748828a9c9e79dfd0b898 for pr-74846
[INFO] extracting crate fuzzcheck_mutators 0.3.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate fuzzcheck_mutators 0.3.0 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 fuzzcheck_mutators 0.3.0
[INFO] finished tweaking crates.io crate fuzzcheck_mutators 0.3.0
[INFO] tweaked toml for crates.io crate fuzzcheck_mutators 0.3.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate fuzzcheck_mutators 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fuzzcheck_mutators_derive v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 30f79e0f7493b5b9a729c148f0cb9c85f84e3b39d5f34bc194331099a1655eef
[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" "30f79e0f7493b5b9a729c148f0cb9c85f84e3b39d5f34bc194331099a1655eef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "30f79e0f7493b5b9a729c148f0cb9c85f84e3b39d5f34bc194331099a1655eef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30f79e0f7493b5b9a729c148f0cb9c85f84e3b39d5f34bc194331099a1655eef", kill_on_drop: false }`
[INFO] [stdout] 30f79e0f7493b5b9a729c148f0cb9c85f84e3b39d5f34bc194331099a1655eef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 9749f73b0ecfd3e925767d9976747db4a55e28987f8d3e9154936b24e1c9bffb
[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" "9749f73b0ecfd3e925767d9976747db4a55e28987f8d3e9154936b24e1c9bffb", kill_on_drop: false }`
[INFO] [stderr]     Checking fuzzcheck_traits v0.3.0
[INFO] [stderr]     Checking fastrand v1.3.3
[INFO] [stderr]    Compiling fuzzcheck_mutators_derive v0.3.0
[INFO] [stderr]     Checking fuzzcheck_mutators v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> examples/derive_struct.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.43s
[INFO] running `Command { std: "docker" "inspect" "9749f73b0ecfd3e925767d9976747db4a55e28987f8d3e9154936b24e1c9bffb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9749f73b0ecfd3e925767d9976747db4a55e28987f8d3e9154936b24e1c9bffb", kill_on_drop: false }`
[INFO] [stdout] 9749f73b0ecfd3e925767d9976747db4a55e28987f8d3e9154936b24e1c9bffb