[INFO] fetching crate sliding_puzzle 1.0.0...
[INFO] checking sliding_puzzle-1.0.0 against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] extracting crate sliding_puzzle 1.0.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate sliding_puzzle 1.0.0 on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate sliding_puzzle 1.0.0
[INFO] finished tweaking crates.io crate sliding_puzzle 1.0.0
[INFO] tweaked toml for crates.io crate sliding_puzzle 1.0.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: An explicit [[bench]] section is specified in Cargo.toml which currently
[INFO] [stderr] disables Cargo from automatically inferring other benchmark targets.
[INFO] [stderr] This inference behavior will change in the Rust 2018 edition and the following
[INFO] [stderr] files will be included as a benchmark target:
[INFO] [stderr] 
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/from_decimal_unchecked.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/new.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/from_decimal.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/slide.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/clone.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/scramble.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/slide_mut.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/to_decimal_unchecked.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/moves.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/slide_unchecked.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/to_decimal.rs
[INFO] [stderr] * /workspace/builds/worker-4/source/benches/slide_mut_unchecked.rs
[INFO] [stderr] 
[INFO] [stderr] This is likely to break cargo build or cargo test as these files may not be
[INFO] [stderr] ready to be compiled as a benchmark target today. You can future-proof yourself
[INFO] [stderr] and disable this warning by adding `autobenches = false` to your [package]
[INFO] [stderr] section. You may also move the files to a location where Cargo would not
[INFO] [stderr] automatically infer them to be a target, such as in subfolders.
[INFO] [stderr] 
[INFO] [stderr] For more information on this warning you can consult
[INFO] [stderr] https://github.com/rust-lang/cargo/issues/5330
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "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] 9cd6d86e0895e0efec6f159683cac94990c8737cb561e4b96d05aa871062b7b4
[INFO] running `Command { std: "docker" "start" "-a" "9cd6d86e0895e0efec6f159683cac94990c8737cb561e4b96d05aa871062b7b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9cd6d86e0895e0efec6f159683cac94990c8737cb561e4b96d05aa871062b7b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9cd6d86e0895e0efec6f159683cac94990c8737cb561e4b96d05aa871062b7b4", kill_on_drop: false }`
[INFO] [stdout] 9cd6d86e0895e0efec6f159683cac94990c8737cb561e4b96d05aa871062b7b4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 74112e2c752b82b4bd9ab1549f81334a78554b8bdfcb58a69e41a669ca8626ce
[INFO] running `Command { std: "docker" "start" "-a" "74112e2c752b82b4bd9ab1549f81334a78554b8bdfcb58a69e41a669ca8626ce", kill_on_drop: false }`
[INFO] [stderr] warning: An explicit [[bench]] section is specified in Cargo.toml which currently
[INFO] [stderr] disables Cargo from automatically inferring other benchmark targets.
[INFO] [stderr] This inference behavior will change in the Rust 2018 edition and the following
[INFO] [stderr] files will be included as a benchmark target:
[INFO] [stderr] 
[INFO] [stderr] * /opt/rustwide/workdir/benches/from_decimal_unchecked.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/new.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/from_decimal.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/slide.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/clone.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/scramble.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/slide_mut.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/to_decimal_unchecked.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/moves.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/slide_unchecked.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/to_decimal.rs
[INFO] [stderr] * /opt/rustwide/workdir/benches/slide_mut_unchecked.rs
[INFO] [stderr] 
[INFO] [stderr] This is likely to break cargo build or cargo test as these files may not be
[INFO] [stderr] ready to be compiled as a benchmark target today. You can future-proof yourself
[INFO] [stderr] and disable this warning by adding `autobenches = false` to your [package]
[INFO] [stderr] section. You may also move the files to a location where Cargo would not
[INFO] [stderr] automatically infer them to be a target, such as in subfolders.
[INFO] [stderr] 
[INFO] [stderr] For more information on this warning you can consult
[INFO] [stderr] https://github.com/rust-lang/cargo/issues/5330
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]     Checking bit-vec v0.4.4
[INFO] [stderr]     Checking lehmer v2.0.0
[INFO] [stderr]     Checking bit-set v0.4.0
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking sliding_puzzle v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/base/mod.rs:72:66
[INFO] [stdout]    |
[INFO] [stdout] 72 |     pub fn slide_mut(&mut self, direction: &Direction) -> Result<(&mut Self)> {
[INFO] [stdout]    |                                                                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/base/mod.rs:72:66
[INFO] [stdout]    |
[INFO] [stdout] 72 |     pub fn slide_mut(&mut self, direction: &Direction) -> Result<(&mut Self)> {
[INFO] [stdout]    |                                                                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.01s
[INFO] running `Command { std: "docker" "inspect" "74112e2c752b82b4bd9ab1549f81334a78554b8bdfcb58a69e41a669ca8626ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74112e2c752b82b4bd9ab1549f81334a78554b8bdfcb58a69e41a669ca8626ce", kill_on_drop: false }`
[INFO] [stdout] 74112e2c752b82b4bd9ab1549f81334a78554b8bdfcb58a69e41a669ca8626ce