[INFO] crate fuzzmutator 0.2.1 is already in cache
[INFO] extracting crate fuzzmutator 0.2.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/fuzzmutator/0.2.1
[INFO] extracting crate fuzzmutator 0.2.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/fuzzmutator/0.2.1
[INFO] validating manifest of fuzzmutator-0.2.1 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of fuzzmutator-0.2.1 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing fuzzmutator-0.2.1
[INFO] finished frobbing fuzzmutator-0.2.1
[INFO] frobbed toml for fuzzmutator-0.2.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/fuzzmutator/0.2.1/Cargo.toml
[INFO] started frobbing fuzzmutator-0.2.1
[INFO] finished frobbing fuzzmutator-0.2.1
[INFO] frobbed toml for fuzzmutator-0.2.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/fuzzmutator/0.2.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing fuzzmutator-0.2.1 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/fuzzmutator/0.2.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 2a90b9e292326b2abdf17fbe3ec06b06c9e2e7c96564dcae81ed82ae2e9955f6
[INFO] running `"docker" "start" "-a" "2a90b9e292326b2abdf17fbe3ec06b06c9e2e7c96564dcae81ed82ae2e9955f6"`
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling fuzzmutator v0.2.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.98s
[INFO] running `"docker" "inspect" "2a90b9e292326b2abdf17fbe3ec06b06c9e2e7c96564dcae81ed82ae2e9955f6"`
[INFO] running `"docker" "rm" "-f" "2a90b9e292326b2abdf17fbe3ec06b06c9e2e7c96564dcae81ed82ae2e9955f6"`
[INFO] [stdout] 2a90b9e292326b2abdf17fbe3ec06b06c9e2e7c96564dcae81ed82ae2e9955f6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/fuzzmutator/0.2.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 77828d0f66fc458ad713d8daed97eba458a47a8ea8de5b940d5b70ebcc10e0e0
[INFO] running `"docker" "start" "-a" "77828d0f66fc458ad713d8daed97eba458a47a8ea8de5b940d5b70ebcc10e0e0"`
[INFO] [stderr]    Compiling fuzzmutator v0.2.1 (/opt/crater/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" "77828d0f66fc458ad713d8daed97eba458a47a8ea8de5b940d5b70ebcc10e0e0"`
[INFO] running `"docker" "rm" "-f" "77828d0f66fc458ad713d8daed97eba458a47a8ea8de5b940d5b70ebcc10e0e0"`
[INFO] [stdout] 77828d0f66fc458ad713d8daed97eba458a47a8ea8de5b940d5b70ebcc10e0e0