[INFO] updating cached repository iH8c0ff33/rust-trie
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/iH8c0ff33/rust-trie
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/iH8c0ff33/rust-trie" "work/ex/clippy-test-run/sources/stable/gh/iH8c0ff33/rust-trie"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/iH8c0ff33/rust-trie'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/iH8c0ff33/rust-trie" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/iH8c0ff33/rust-trie"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/iH8c0ff33/rust-trie'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ea4770e936a4be7fef9b0454dec45e6e4c804d4d
[INFO] sha for GitHub repo iH8c0ff33/rust-trie: ea4770e936a4be7fef9b0454dec45e6e4c804d4d
[INFO] validating manifest of iH8c0ff33/rust-trie 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 iH8c0ff33/rust-trie 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 iH8c0ff33/rust-trie
[INFO] finished frobbing iH8c0ff33/rust-trie
[INFO] frobbed toml for iH8c0ff33/rust-trie written to work/ex/clippy-test-run/sources/stable/gh/iH8c0ff33/rust-trie/Cargo.toml
[INFO] started frobbing iH8c0ff33/rust-trie
[INFO] finished frobbing iH8c0ff33/rust-trie
[INFO] frobbed toml for iH8c0ff33/rust-trie written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/iH8c0ff33/rust-trie/Cargo.toml
[INFO] crate iH8c0ff33/rust-trie 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 iH8c0ff33/rust-trie 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/iH8c0ff33/rust-trie:/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] 0197314f7115ddadc2c4967b5675807c58e0783277ef7ac5088303c14aa4fc71
[INFO] running `"docker" "start" "-a" "0197314f7115ddadc2c4967b5675807c58e0783277ef7ac5088303c14aa4fc71"`
[INFO] [stderr]     Checking trie v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]   --> src/trie_traversal.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 27 |           } else {
[INFO] [stderr]    |  ________________^
[INFO] [stderr] 28 | |             if let Some(position) = self
[INFO] [stderr] 29 | |                 .children
[INFO] [stderr] 30 | |                 .iter_mut()
[INFO] [stderr] ...  |
[INFO] [stderr] 37 | |             }
[INFO] [stderr] 38 | |         }
[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] 27 |         } else if let Some(position) = self
[INFO] [stderr] 28 |     .children
[INFO] [stderr] 29 |     .iter_mut()
[INFO] [stderr] 30 |     .position(|child| child.key == tail[0])
[INFO] [stderr] 31 | {
[INFO] [stderr] 32 |     self.children[position].insert(tail.to_vec())
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_node.rs:20:23
[INFO] [stderr]    |
[INFO] [stderr] 20 |             boundary: tail.len() == 0,
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `tail.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_node.rs:21:26
[INFO] [stderr]    |
[INFO] [stderr] 21 |             children: if tail.len() == 0 {
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `tail.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_traversal.rs:20:12
[INFO] [stderr]    |
[INFO] [stderr] 20 |         if tail.len() == 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `tail.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: this lifetime isn't used in the function definition
[INFO] [stderr]   --> src/trie_traversal.rs:52:18
[INFO] [stderr]    |
[INFO] [stderr] 52 |         fn $name<'a>(trie: $trie_type, prefix: Vec<char>) -> Option<$trie_type> {
[INFO] [stderr]    |                  ^^
[INFO] [stderr] ...
[INFO] [stderr] 74 | get_fn!(name: trie_get, trie_type: &Trie, iter_fn: iter);
[INFO] [stderr]    | --------------------------------------------------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::extra_unused_lifetimes)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: this lifetime isn't used in the function definition
[INFO] [stderr]   --> src/trie_traversal.rs:52:18
[INFO] [stderr]    |
[INFO] [stderr] 52 |         fn $name<'a>(trie: $trie_type, prefix: Vec<char>) -> Option<$trie_type> {
[INFO] [stderr]    |                  ^^
[INFO] [stderr] ...
[INFO] [stderr] 75 | get_fn!(name: trie_get_mut, trie_type: &mut Trie, iter_fn: iter_mut);
[INFO] [stderr]    | --------------------------------------------------------------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_traversal.rs:84:16
[INFO] [stderr]    |
[INFO] [stderr] 84 |             if parent.children[pos].children.len() != 0 {
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!parent.children[pos].children.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_iter.rs:35:12
[INFO] [stderr]    |
[INFO] [stderr] 35 |         if self.acc.len() == 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `self.acc.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]   --> src/trie_traversal.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 27 |           } else {
[INFO] [stderr]    |  ________________^
[INFO] [stderr] 28 | |             if let Some(position) = self
[INFO] [stderr] 29 | |                 .children
[INFO] [stderr] 30 | |                 .iter_mut()
[INFO] [stderr] ...  |
[INFO] [stderr] 37 | |             }
[INFO] [stderr] 38 | |         }
[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] 27 |         } else if let Some(position) = self
[INFO] [stderr] 28 |     .children
[INFO] [stderr] 29 |     .iter_mut()
[INFO] [stderr] 30 |     .position(|child| child.key == tail[0])
[INFO] [stderr] 31 | {
[INFO] [stderr] 32 |     self.children[position].insert(tail.to_vec())
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_node.rs:20:23
[INFO] [stderr]    |
[INFO] [stderr] 20 |             boundary: tail.len() == 0,
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `tail.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_node.rs:21:26
[INFO] [stderr]    |
[INFO] [stderr] 21 |             children: if tail.len() == 0 {
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `tail.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_traversal.rs:20:12
[INFO] [stderr]    |
[INFO] [stderr] 20 |         if tail.len() == 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `tail.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: this lifetime isn't used in the function definition
[INFO] [stderr]   --> src/trie_traversal.rs:52:18
[INFO] [stderr]    |
[INFO] [stderr] 52 |         fn $name<'a>(trie: $trie_type, prefix: Vec<char>) -> Option<$trie_type> {
[INFO] [stderr]    |                  ^^
[INFO] [stderr] ...
[INFO] [stderr] 74 | get_fn!(name: trie_get, trie_type: &Trie, iter_fn: iter);
[INFO] [stderr]    | --------------------------------------------------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::extra_unused_lifetimes)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: this lifetime isn't used in the function definition
[INFO] [stderr]   --> src/trie_traversal.rs:52:18
[INFO] [stderr]    |
[INFO] [stderr] 52 |         fn $name<'a>(trie: $trie_type, prefix: Vec<char>) -> Option<$trie_type> {
[INFO] [stderr]    |                  ^^
[INFO] [stderr] ...
[INFO] [stderr] 75 | get_fn!(name: trie_get_mut, trie_type: &mut Trie, iter_fn: iter_mut);
[INFO] [stderr]    | --------------------------------------------------------------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_traversal.rs:84:16
[INFO] [stderr]    |
[INFO] [stderr] 84 |             if parent.children[pos].children.len() != 0 {
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!parent.children[pos].children.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/trie_iter.rs:35:12
[INFO] [stderr]    |
[INFO] [stderr] 35 |         if self.acc.len() == 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `self.acc.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.07s
[INFO] running `"docker" "inspect" "0197314f7115ddadc2c4967b5675807c58e0783277ef7ac5088303c14aa4fc71"`
[INFO] running `"docker" "rm" "-f" "0197314f7115ddadc2c4967b5675807c58e0783277ef7ac5088303c14aa4fc71"`
[INFO] [stdout] 0197314f7115ddadc2c4967b5675807c58e0783277ef7ac5088303c14aa4fc71