[INFO] updating cached repository DCP-solved-with-Rust/dcp_00003
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/DCP-solved-with-Rust/dcp_00003
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/DCP-solved-with-Rust/dcp_00003" "work/ex/clippy-test-run/sources/stable/gh/DCP-solved-with-Rust/dcp_00003"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/DCP-solved-with-Rust/dcp_00003'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/DCP-solved-with-Rust/dcp_00003" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DCP-solved-with-Rust/dcp_00003"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DCP-solved-with-Rust/dcp_00003'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d76f6932e578d891f5433167a477c8e9c7e5ee03
[INFO] sha for GitHub repo DCP-solved-with-Rust/dcp_00003: d76f6932e578d891f5433167a477c8e9c7e5ee03
[INFO] validating manifest of DCP-solved-with-Rust/dcp_00003 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 DCP-solved-with-Rust/dcp_00003 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 DCP-solved-with-Rust/dcp_00003
[INFO] finished frobbing DCP-solved-with-Rust/dcp_00003
[INFO] frobbed toml for DCP-solved-with-Rust/dcp_00003 written to work/ex/clippy-test-run/sources/stable/gh/DCP-solved-with-Rust/dcp_00003/Cargo.toml
[INFO] started frobbing DCP-solved-with-Rust/dcp_00003
[INFO] finished frobbing DCP-solved-with-Rust/dcp_00003
[INFO] frobbed toml for DCP-solved-with-Rust/dcp_00003 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DCP-solved-with-Rust/dcp_00003/Cargo.toml
[INFO] crate DCP-solved-with-Rust/dcp_00003 has a lockfile. skipping
[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 DCP-solved-with-Rust/dcp_00003 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-3/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/DCP-solved-with-Rust/dcp_00003:/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] e2f924fef6c746207434f167332b1c4c60079041c9de275826e8950bab41685f
[INFO] running `"docker" "start" "-a" "e2f924fef6c746207434f167332b1c4c60079041c9de275826e8950bab41685f"`
[INFO] [stderr]     Checking dcp_00003 v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     return serde_json::to_string(&root).unwrap();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `serde_json::to_string(&root).unwrap()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:57:5
[INFO] [stderr]    |
[INFO] [stderr] 57 |     return serde_json::from_str(s.as_str()).unwrap();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `serde_json::from_str(s.as_str()).unwrap()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `serialize`
[INFO] [stderr]   --> src/lib.rs:50:1
[INFO] [stderr]    |
[INFO] [stderr] 50 | fn serialize (root: Node) -> String
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `deserialize`
[INFO] [stderr]   --> src/lib.rs:55:1
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn deserialize (s: String) -> Node
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     return serde_json::to_string(&root).unwrap();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `serde_json::to_string(&root).unwrap()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:57:5
[INFO] [stderr]    |
[INFO] [stderr] 57 |     return serde_json::from_str(s.as_str()).unwrap();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `serde_json::from_str(s.as_str()).unwrap()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.52s
[INFO] running `"docker" "inspect" "e2f924fef6c746207434f167332b1c4c60079041c9de275826e8950bab41685f"`
[INFO] running `"docker" "rm" "-f" "e2f924fef6c746207434f167332b1c4c60079041c9de275826e8950bab41685f"`
[INFO] [stdout] e2f924fef6c746207434f167332b1c4c60079041c9de275826e8950bab41685f