[INFO] updating cached repository kgtkr/op_abstraction
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kgtkr/op_abstraction
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kgtkr/op_abstraction" "work/ex/clippy-test-run/sources/stable/gh/kgtkr/op_abstraction"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/kgtkr/op_abstraction'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kgtkr/op_abstraction" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/kgtkr/op_abstraction"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/kgtkr/op_abstraction'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9ce8b6763ea8f6a7ea3af47efb12a5cdc92ef059
[INFO] sha for GitHub repo kgtkr/op_abstraction: 9ce8b6763ea8f6a7ea3af47efb12a5cdc92ef059
[INFO] validating manifest of kgtkr/op_abstraction 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 kgtkr/op_abstraction 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 kgtkr/op_abstraction
[INFO] finished frobbing kgtkr/op_abstraction
[INFO] frobbed toml for kgtkr/op_abstraction written to work/ex/clippy-test-run/sources/stable/gh/kgtkr/op_abstraction/Cargo.toml
[INFO] started frobbing kgtkr/op_abstraction
[INFO] finished frobbing kgtkr/op_abstraction
[INFO] frobbed toml for kgtkr/op_abstraction written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/kgtkr/op_abstraction/Cargo.toml
[INFO] crate kgtkr/op_abstraction 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 kgtkr/op_abstraction 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/gh/kgtkr/op_abstraction:/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] 4c5648a27ec132547e6dde443896465f2fbdaa1b2b1c2cbc5d843987de513e6b
[INFO] running `"docker" "start" "-a" "4c5648a27ec132547e6dde443896465f2fbdaa1b2b1c2cbc5d843987de513e6b"`
[INFO] [stderr]     Checking op_abstraction v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]   --> src/main.rs:8:12
[INFO] [stderr]    |
[INFO] [stderr] 8  |       } else {
[INFO] [stderr]    |  ____________^
[INFO] [stderr] 9  | |         if b == 1 {
[INFO] [stderr] 10 | |             a
[INFO] [stderr] 11 | |         } else {
[INFO] [stderr] 12 | |             op(i - 1, a, op(i, a, b - 1))
[INFO] [stderr] 13 | |         }
[INFO] [stderr] 14 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]    |
[INFO] [stderr] 8  |     } else if b == 1 {
[INFO] [stderr] 9  |     a
[INFO] [stderr] 10 | } else {
[INFO] [stderr] 11 |     op(i - 1, a, op(i, a, b - 1))
[INFO] [stderr] 12 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `op`
[INFO] [stderr]  --> src/main.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn op(i: i32, a: i64, b: i64) -> i64 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]   --> src/main.rs:8:12
[INFO] [stderr]    |
[INFO] [stderr] 8  |       } else {
[INFO] [stderr]    |  ____________^
[INFO] [stderr] 9  | |         if b == 1 {
[INFO] [stderr] 10 | |             a
[INFO] [stderr] 11 | |         } else {
[INFO] [stderr] 12 | |             op(i - 1, a, op(i, a, b - 1))
[INFO] [stderr] 13 | |         }
[INFO] [stderr] 14 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]    |
[INFO] [stderr] 8  |     } else if b == 1 {
[INFO] [stderr] 9  |     a
[INFO] [stderr] 10 | } else {
[INFO] [stderr] 11 |     op(i - 1, a, op(i, a, b - 1))
[INFO] [stderr] 12 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the operation is ineffective. Consider reducing it to `1`
[INFO] [stderr]   --> src/main.rs:29:33
[INFO] [stderr]    |
[INFO] [stderr] 29 |         assert_eq!(op(2, 1, 1), 1 * 1);
[INFO] [stderr]    |                                 ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::identity_op)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_op
[INFO] [stderr] 
[INFO] [stderr] warning: the operation is ineffective. Consider reducing it to `1`
[INFO] [stderr]   --> src/main.rs:29:33
[INFO] [stderr]    |
[INFO] [stderr] 29 |         assert_eq!(op(2, 1, 1), 1 * 1);
[INFO] [stderr]    |                                 ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_op
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `"docker" "inspect" "4c5648a27ec132547e6dde443896465f2fbdaa1b2b1c2cbc5d843987de513e6b"`
[INFO] running `"docker" "rm" "-f" "4c5648a27ec132547e6dde443896465f2fbdaa1b2b1c2cbc5d843987de513e6b"`
[INFO] [stdout] 4c5648a27ec132547e6dde443896465f2fbdaa1b2b1c2cbc5d843987de513e6b