[INFO] crate rc_arena 0.1.0 is already in cache
[INFO] extracting crate rc_arena 0.1.0 into work/ex/clippy-test-run/sources/stable/reg/rc_arena/0.1.0
[INFO] extracting crate rc_arena 0.1.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/rc_arena/0.1.0
[INFO] validating manifest of rc_arena-0.1.0 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 rc_arena-0.1.0 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 rc_arena-0.1.0
[INFO] finished frobbing rc_arena-0.1.0
[INFO] frobbed toml for rc_arena-0.1.0 written to work/ex/clippy-test-run/sources/stable/reg/rc_arena/0.1.0/Cargo.toml
[INFO] started frobbing rc_arena-0.1.0
[INFO] finished frobbing rc_arena-0.1.0
[INFO] frobbed toml for rc_arena-0.1.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/rc_arena/0.1.0/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 rc_arena-0.1.0 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-6/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/rc_arena/0.1.0:/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] b0ef9f03006ffbf45c502f98892e0bdb93271c592bba25a0ab9cd40b43ca9746
[INFO] running `"docker" "start" "-a" "b0ef9f03006ffbf45c502f98892e0bdb93271c592bba25a0ab9cd40b43ca9746"`
[INFO] [stderr]     Checking rc_arena v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: item `Arena<T>` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/lib.rs:84:1
[INFO] [stderr]     |
[INFO] [stderr] 84  | / impl<T> Arena<T> {
[INFO] [stderr] 85  | |     /// Create a new arena with an unspecified capacity.
[INFO] [stderr] 86  | |     pub fn new() -> Arena<T> {
[INFO] [stderr] 87  | |         Arena::with_capacity(8)
[INFO] [stderr] ...   |
[INFO] [stderr] 178 | |     }
[INFO] [stderr] 179 | | }
[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: you should consider deriving a `Default` implementation for `Arena<T>`
[INFO] [stderr]   --> src/lib.rs:86:2
[INFO] [stderr]    |
[INFO] [stderr] 86 |       pub fn new() -> Arena<T> {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 87 | |         Arena::with_capacity(8)
[INFO] [stderr] 88 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 80 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: this `.fold` can be written more succinctly using another method
[INFO] [stderr]    --> src/lib.rs:141:33
[INFO] [stderr]     |
[INFO] [stderr] 141 |         chunks.iter().map(|a| a.len()).fold(0, |a, b| a+b)
[INFO] [stderr]     |                                       ^^^^^^^^^^^^^^^^^^^^ help: try: `.sum()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::unnecessary_fold)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_fold
[INFO] [stderr] 
[INFO] [stderr] warning: item `Arena<T>` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/lib.rs:84:1
[INFO] [stderr]     |
[INFO] [stderr] 84  | / impl<T> Arena<T> {
[INFO] [stderr] 85  | |     /// Create a new arena with an unspecified capacity.
[INFO] [stderr] 86  | |     pub fn new() -> Arena<T> {
[INFO] [stderr] 87  | |         Arena::with_capacity(8)
[INFO] [stderr] ...   |
[INFO] [stderr] 178 | |     }
[INFO] [stderr] 179 | | }
[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: you should consider deriving a `Default` implementation for `Arena<T>`
[INFO] [stderr]   --> src/lib.rs:86:2
[INFO] [stderr]    |
[INFO] [stderr] 86 |       pub fn new() -> Arena<T> {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 87 | |         Arena::with_capacity(8)
[INFO] [stderr] 88 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 80 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: this `.fold` can be written more succinctly using another method
[INFO] [stderr]    --> src/lib.rs:141:33
[INFO] [stderr]     |
[INFO] [stderr] 141 |         chunks.iter().map(|a| a.len()).fold(0, |a, b| a+b)
[INFO] [stderr]     |                                       ^^^^^^^^^^^^^^^^^^^^ help: try: `.sum()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::unnecessary_fold)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_fold
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `"docker" "inspect" "b0ef9f03006ffbf45c502f98892e0bdb93271c592bba25a0ab9cd40b43ca9746"`
[INFO] running `"docker" "rm" "-f" "b0ef9f03006ffbf45c502f98892e0bdb93271c592bba25a0ab9cd40b43ca9746"`
[INFO] [stdout] b0ef9f03006ffbf45c502f98892e0bdb93271c592bba25a0ab9cd40b43ca9746