[INFO] crate id-arena 2.0.0 is already in cache
[INFO] extracting crate id-arena 2.0.0 into work/ex/clippy-test-run/sources/stable/reg/id-arena/2.0.0
[INFO] extracting crate id-arena 2.0.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/id-arena/2.0.0
[INFO] validating manifest of id-arena-2.0.0 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of id-arena-2.0.0 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing id-arena-2.0.0
[INFO] finished frobbing id-arena-2.0.0
[INFO] frobbed toml for id-arena-2.0.0 written to work/ex/clippy-test-run/sources/stable/reg/id-arena/2.0.0/Cargo.toml
[INFO] started frobbing id-arena-2.0.0
[INFO] finished frobbing id-arena-2.0.0
[INFO] frobbed toml for id-arena-2.0.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/id-arena/2.0.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting id-arena-2.0.0 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/id-arena/2.0.0:/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=forbid" "-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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 6b9a21842c5244dafcd1b03f156776908f0e6d6d31b01dfdf9fe6d7e2d16237d
[INFO] running `"docker" "start" "-a" "6b9a21842c5244dafcd1b03f156776908f0e6d6d31b01dfdf9fe6d7e2d16237d"`
[INFO] [stderr]     Checking id-arena v2.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: item `Arena<T, A>` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/lib.rs:287:1
[INFO] [stderr]     |
[INFO] [stderr] 287 | / impl<T, A> Arena<T, A>
[INFO] [stderr] 288 | | where
[INFO] [stderr] 289 | |     A: ArenaBehavior,
[INFO] [stderr] 290 | | {
[INFO] [stderr] ...   |
[INFO] [stderr] 413 | |     }
[INFO] [stderr] 414 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: item `Arena<T, A>` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/lib.rs:287:1
[INFO] [stderr]     |
[INFO] [stderr] 287 | / impl<T, A> Arena<T, A>
[INFO] [stderr] 288 | | where
[INFO] [stderr] 289 | |     A: ArenaBehavior,
[INFO] [stderr] 290 | | {
[INFO] [stderr] ...   |
[INFO] [stderr] 413 | |     }
[INFO] [stderr] 414 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.40s
[INFO] running `"docker" "inspect" "6b9a21842c5244dafcd1b03f156776908f0e6d6d31b01dfdf9fe6d7e2d16237d"`
[INFO] running `"docker" "rm" "-f" "6b9a21842c5244dafcd1b03f156776908f0e6d6d31b01dfdf9fe6d7e2d16237d"`
[INFO] [stdout] 6b9a21842c5244dafcd1b03f156776908f0e6d6d31b01dfdf9fe6d7e2d16237d