[INFO] fetching crate fuzzmutator 0.2.1...
[INFO] checking fuzzmutator-0.2.1 against master#506512391b1a75ae450d36c9420978402a91abcc for pr-125384
[INFO] extracting crate fuzzmutator 0.2.1 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate fuzzmutator 0.2.1 on toolchain 506512391b1a75ae450d36c9420978402a91abcc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 10 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.4.6 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_core v0.3.1 (latest: v0.6.4)
[INFO] [stderr]       Adding rand_core v0.4.2 (latest: v0.6.4)
[INFO] [stderr]       Adding rdrand v0.4.0 (latest: v0.8.3)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand v0.4.6
[INFO] [stderr]   Downloaded rand_core v0.3.1
[INFO] [stderr]   Downloaded fuchsia-cprng v0.1.1
[INFO] [stderr]   Downloaded rand_core v0.4.2
[INFO] [stderr]   Downloaded rdrand v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 759d51ae6e4f16965b8c6f430f9cb11799331272e9ae437a5f0a90327ce9331b
[INFO] running `Command { std: "docker" "start" "-a" "759d51ae6e4f16965b8c6f430f9cb11799331272e9ae437a5f0a90327ce9331b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "759d51ae6e4f16965b8c6f430f9cb11799331272e9ae437a5f0a90327ce9331b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "759d51ae6e4f16965b8c6f430f9cb11799331272e9ae437a5f0a90327ce9331b", kill_on_drop: false }`
[INFO] [stdout] 759d51ae6e4f16965b8c6f430f9cb11799331272e9ae437a5f0a90327ce9331b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 71e3661e2c6e2747228dc691c61b61cb5b43a25aec91237ae62cf0594ee49aaa
[INFO] running `Command { std: "docker" "start" "-a" "71e3661e2c6e2747228dc691c61b61cb5b43a25aec91237ae62cf0594ee49aaa", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking fuzzmutator v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `mutation_grade` found for struct `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 struct
[INFO] [stdout] ...
[INFO] [stdout] 389 |         mutatoren.mutation_grade(0.199);
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^ method not found in `MutatorEngine`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "71e3661e2c6e2747228dc691c61b61cb5b43a25aec91237ae62cf0594ee49aaa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71e3661e2c6e2747228dc691c61b61cb5b43a25aec91237ae62cf0594ee49aaa", kill_on_drop: false }`
[INFO] [stdout] 71e3661e2c6e2747228dc691c61b61cb5b43a25aec91237ae62cf0594ee49aaa
[INFO] checking fuzzmutator-0.2.1 against try#dae34b759e282c069aa28752564694effd121a63 for pr-125384
[INFO] extracting crate fuzzmutator 0.2.1 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate fuzzmutator 0.2.1 on toolchain dae34b759e282c069aa28752564694effd121a63
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 10 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.4.6 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_core v0.3.1 (latest: v0.6.4)
[INFO] [stderr]       Adding rand_core v0.4.2 (latest: v0.6.4)
[INFO] [stderr]       Adding rdrand v0.4.0 (latest: v0.8.3)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] de82971ae2d71dc5c6d564a00e07b0ef31b76d1159de548dce8784ca909d91c7
[INFO] running `Command { std: "docker" "start" "-a" "de82971ae2d71dc5c6d564a00e07b0ef31b76d1159de548dce8784ca909d91c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de82971ae2d71dc5c6d564a00e07b0ef31b76d1159de548dce8784ca909d91c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de82971ae2d71dc5c6d564a00e07b0ef31b76d1159de548dce8784ca909d91c7", kill_on_drop: false }`
[INFO] [stdout] de82971ae2d71dc5c6d564a00e07b0ef31b76d1159de548dce8784ca909d91c7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 98e489c07553d9f752da4216504282f4d2d622b357d35779fd1d3cbbad72eabe
[INFO] running `Command { std: "docker" "start" "-a" "98e489c07553d9f752da4216504282f4d2d622b357d35779fd1d3cbbad72eabe", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] no edition found in manifest, probably 2015, skipping
[INFO] running `Command { std: "docker" "inspect" "98e489c07553d9f752da4216504282f4d2d622b357d35779fd1d3cbbad72eabe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98e489c07553d9f752da4216504282f4d2d622b357d35779fd1d3cbbad72eabe", kill_on_drop: false }`
[INFO] [stdout] 98e489c07553d9f752da4216504282f4d2d622b357d35779fd1d3cbbad72eabe