[INFO] crate fuzzmutator 0.2.1 is already in cache
[INFO] testing fuzzmutator-0.2.1 against beta-2020-07-24 for beta-1.46-1
[INFO] extracting crate fuzzmutator 0.2.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate fuzzmutator 0.2.1 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fuzzmutator 0.2.1
[INFO] finished tweaking crates.io crate fuzzmutator 0.2.1
[INFO] tweaked toml for crates.io crate fuzzmutator 0.2.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", 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] 0e88a0155550ff8dcc7f88b0c4505357ecc4838027bee13caa4eda2c749de389
[INFO] running `Command { std: "docker" "start" "-a" "0e88a0155550ff8dcc7f88b0c4505357ecc4838027bee13caa4eda2c749de389", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0e88a0155550ff8dcc7f88b0c4505357ecc4838027bee13caa4eda2c749de389", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e88a0155550ff8dcc7f88b0c4505357ecc4838027bee13caa4eda2c749de389", kill_on_drop: false }`
[INFO] [stdout] 0e88a0155550ff8dcc7f88b0c4505357ecc4838027bee13caa4eda2c749de389
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ade8b5959621b7c258a41164edf37dbb0943dace00cc98c5217af4f4eae8b0c2
[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" "ade8b5959621b7c258a41164edf37dbb0943dace00cc98c5217af4f4eae8b0c2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling fuzzmutator v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.61s
[INFO] running `Command { std: "docker" "inspect" "ade8b5959621b7c258a41164edf37dbb0943dace00cc98c5217af4f4eae8b0c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ade8b5959621b7c258a41164edf37dbb0943dace00cc98c5217af4f4eae8b0c2", kill_on_drop: false }`
[INFO] [stdout] ade8b5959621b7c258a41164edf37dbb0943dace00cc98c5217af4f4eae8b0c2
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c0e51c7b6f23ff5bde981fc54985c7a07a38ed5d984f34932ab7f918ad9cd92e
[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" "c0e51c7b6f23ff5bde981fc54985c7a07a38ed5d984f34932ab7f918ad9cd92e", kill_on_drop: false }`
[INFO] [stderr]    Compiling fuzzmutator v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `mutation_grade` found for struct `mutator::MutatorEngine` in the current scope
[INFO] [stdout]    --> src/mutator.rs:389:19
[INFO] [stdout]     |
[INFO] [stdout] 28  | pub struct MutatorEngine {
[INFO] [stdout]     | ------------------------ method `mutation_grade` not found for this
[INFO] [stdout] ...
[INFO] [stdout] 389 |         mutatoren.mutation_grade(0.199);
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^ method not found in `mutator::MutatorEngine`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fuzzmutator`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "c0e51c7b6f23ff5bde981fc54985c7a07a38ed5d984f34932ab7f918ad9cd92e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0e51c7b6f23ff5bde981fc54985c7a07a38ed5d984f34932ab7f918ad9cd92e", kill_on_drop: false }`
[INFO] [stdout] c0e51c7b6f23ff5bde981fc54985c7a07a38ed5d984f34932ab7f918ad9cd92e