[INFO] crate fuzzmutator 0.2.1 is already in cache
[INFO] testing fuzzmutator-0.2.1 against 1.38.0 for beta-1.39-1
[INFO] extracting crate fuzzmutator 0.2.1 into work/builds/worker-1/source
[INFO] validating manifest of crates.io crate fuzzmutator 0.2.1 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[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 work/builds/worker-1/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 910b925722bfb36825cb23304309e48b4abaffe282d756ce984932e96be6de99
[INFO] running `"docker" "start" "-a" "910b925722bfb36825cb23304309e48b4abaffe282d756ce984932e96be6de99"`
[INFO] [stderr]    Compiling libc v0.2.62
[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 2.75s
[INFO] running `"docker" "inspect" "910b925722bfb36825cb23304309e48b4abaffe282d756ce984932e96be6de99"`
[INFO] running `"docker" "rm" "-f" "910b925722bfb36825cb23304309e48b4abaffe282d756ce984932e96be6de99"`
[INFO] [stdout] 910b925722bfb36825cb23304309e48b4abaffe282d756ce984932e96be6de99
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 5a1db012c2d845cb481be9d923ccdc86a8af6878f01a3c75690bae3dc642fdf8
[INFO] running `"docker" "start" "-a" "5a1db012c2d845cb481be9d923ccdc86a8af6878f01a3c75690bae3dc642fdf8"`
[INFO] [stderr]    Compiling fuzzmutator v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0599]: no method named `mutation_grade` found for type `mutator::MutatorEngine` in the current scope
[INFO] [stderr]    --> src/mutator.rs:389:19
[INFO] [stderr]     |
[INFO] [stderr] 28  | pub struct MutatorEngine {
[INFO] [stderr]     | ------------------------ method `mutation_grade` not found for this
[INFO] [stderr] ...
[INFO] [stderr] 389 |         mutatoren.mutation_grade(0.199);
[INFO] [stderr]     |                   ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: Could not compile `fuzzmutator`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5a1db012c2d845cb481be9d923ccdc86a8af6878f01a3c75690bae3dc642fdf8"`
[INFO] running `"docker" "rm" "-f" "5a1db012c2d845cb481be9d923ccdc86a8af6878f01a3c75690bae3dc642fdf8"`
[INFO] [stdout] 5a1db012c2d845cb481be9d923ccdc86a8af6878f01a3c75690bae3dc642fdf8