[INFO] updating cached repository ryota-sakamoto/rust_study
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ryota-sakamoto/rust_study
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ryota-sakamoto/rust_study" "work/ex/clippy-test-run/sources/stable/gh/ryota-sakamoto/rust_study"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/ryota-sakamoto/rust_study'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ryota-sakamoto/rust_study" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/ryota-sakamoto/rust_study"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/ryota-sakamoto/rust_study'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5eb4f8bec1711983c25dcc199f9e5c1cb2a2aa47
[INFO] sha for GitHub repo ryota-sakamoto/rust_study: 5eb4f8bec1711983c25dcc199f9e5c1cb2a2aa47
[INFO] validating manifest of ryota-sakamoto/rust_study 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 ryota-sakamoto/rust_study 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 ryota-sakamoto/rust_study
[INFO] finished frobbing ryota-sakamoto/rust_study
[INFO] frobbed toml for ryota-sakamoto/rust_study written to work/ex/clippy-test-run/sources/stable/gh/ryota-sakamoto/rust_study/Cargo.toml
[INFO] started frobbing ryota-sakamoto/rust_study
[INFO] finished frobbing ryota-sakamoto/rust_study
[INFO] frobbed toml for ryota-sakamoto/rust_study written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/ryota-sakamoto/rust_study/Cargo.toml
[INFO] crate ryota-sakamoto/rust_study 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 ryota-sakamoto/rust_study against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-2/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/ryota-sakamoto/rust_study:/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 -Dclippy::into_iter_on_array" "-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] d44400c046145e17100707d3239e5a8e23d787cff3fafaef616e7686223ee80c
[INFO] running `"docker" "start" "-a" "d44400c046145e17100707d3239e5a8e23d787cff3fafaef616e7686223ee80c"`
[INFO] [stderr]     Checking rust_test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: You matched a field with a wildcard pattern. Consider using `..` instead
[INFO] [stderr]   --> src/list.rs:27:42
[INFO] [stderr]    |
[INFO] [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |                                          ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unneeded_field_pattern)] on by default
[INFO] [stderr]    = help: Try with `List { head: ref head, .. }`
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: All the struct fields are matched to a wildcard pattern, consider using `..`.
[INFO] [stderr]   --> src/list.rs:47:14
[INFO] [stderr]    |
[INFO] [stderr] 47 |             &List::List {head: _, tail: _} => false,
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Try with `List { .. }` instead
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/list.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | / macro_rules! list {
[INFO] [stderr] 54 | |     ($($n: expr),*) => {
[INFO] [stderr] 55 | |         {
[INFO] [stderr] 56 | |             let mut list = List::empty_list();
[INFO] [stderr] ...  |
[INFO] [stderr] 74 | |     };
[INFO] [stderr] 75 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `call`
[INFO] [stderr]  --> src/module.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn call() {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `List`
[INFO] [stderr]  --> src/list.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub enum List<T: Debug> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `empty_list`
[INFO] [stderr]   --> src/list.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub fn empty_list() -> List<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `prepend`
[INFO] [stderr]   --> src/list.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn prepend(self, t: T) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `head`
[INFO] [stderr]   --> src/list.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn head(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last`
[INFO] [stderr]   --> src/list.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn last(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]   --> src/list.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tailrec`
[INFO] [stderr]   --> src/list.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn tailrec<T: Debug>(list: &List<T>) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 | /         match self {
[INFO] [stderr] 26 | |             &List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 27 | |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr] 28 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 25 |         match *self {
[INFO] [stderr] 26 |             List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 27 |             List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:27:26
[INFO] [stderr]    |
[INFO] [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |                          -----^^^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this
[INFO] [stderr]    |
[INFO] [stderr] warning: You matched a field with a wildcard pattern. Consider using `..` instead
[INFO] [stderr]   --> src/list.rs:27:42
[INFO] [stderr]    |
[INFO] [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |                                          ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unneeded_field_pattern)] on by default
[INFO] [stderr]    = help: Try with `List { head: ref head, .. }`
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: All the struct fields are matched to a wildcard pattern, consider using `..`.
[INFO] [stderr]   --> src/list.rs:47:14
[INFO] [stderr]    |
[INFO] [stderr] 47 |             &List::List {head: _, tail: _} => false,
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Try with `List { .. }` instead
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/list.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | / macro_rules! list {
[INFO] [stderr] 54 | |     ($($n: expr),*) => {
[INFO] [stderr] 55 | |         {
[INFO] [stderr] 56 | |             let mut list = List::empty_list();
[INFO] [stderr] ...  |
[INFO] [stderr] 74 | |     };
[INFO] [stderr] 75 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr]    = note: #[warn(non_shorthand_field_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 | /         match self {
[INFO] [stderr] 33 | |             &List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 34 | |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr] 35 | |                 if tail.is_empty() {
[INFO] [stderr] ...  |
[INFO] [stderr] 40 | |             },
[INFO] [stderr] 41 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 32 |         match *self {
[INFO] [stderr] 33 |             List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 34 |             List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:34:26
[INFO] [stderr]    |
[INFO] [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                          -----^^^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `tail:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:34:42
[INFO] [stderr]    |
[INFO] [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                                          -----^^^^^^^^^
[INFO] [stderr]    |                                          |
[INFO] [stderr]    |                                          help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:45:9
[INFO] [stderr]    |
[INFO] [stderr] 45 | /         match self {
[INFO] [stderr] 46 | |             &List::Nil => true,
[INFO] [stderr] 47 | |             &List::List {head: _, tail: _} => false,
[INFO] [stderr] 48 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 45 |         match *self {
[INFO] [stderr] 46 |             List::Nil => true,
[INFO] [stderr] 47 |             List::List {head: _, tail: _} => false,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:88:5
[INFO] [stderr]    |
[INFO] [stderr] 88 | /     match list {
[INFO] [stderr] 89 | |         &List::Nil => println!("list is nil"),
[INFO] [stderr] 90 | |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr] 91 | |             println!("head = {:#?}, tail is {}", head, if tail.is_empty() {
[INFO] [stderr] ...  |
[INFO] [stderr] 97 | |         },
[INFO] [stderr] 98 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 88 |     match *list {
[INFO] [stderr] 89 |         List::Nil => println!("list is nil"),
[INFO] [stderr] 90 |         List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:90:22
[INFO] [stderr]    |
[INFO] [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                      -----^^^^^^^^^
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `tail:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:90:38
[INFO] [stderr]    |
[INFO] [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                                      -----^^^^^^^^^
[INFO] [stderr]    |                                      |
[INFO] [stderr]    |                                      help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `call`
[INFO] [stderr]  --> src/module.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn call() {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `List`
[INFO] [stderr]  --> src/list.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub enum List<T: Debug> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `empty_list`
[INFO] [stderr]   --> src/list.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub fn empty_list() -> List<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `prepend`
[INFO] [stderr]   --> src/list.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn prepend(self, t: T) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `head`
[INFO] [stderr]   --> src/list.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn head(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last`
[INFO] [stderr]   --> src/list.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn last(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]   --> src/list.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tailrec`
[INFO] [stderr]   --> src/list.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn tailrec<T: Debug>(list: &List<T>) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 | /         match self {
[INFO] [stderr] 26 | |             &List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 27 | |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr] 28 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 25 |         match *self {
[INFO] [stderr] 26 |             List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 27 |             List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:27:26
[INFO] [stderr]    |
[INFO] [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |                          -----^^^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_shorthand_field_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 | /         match self {
[INFO] [stderr] 33 | |             &List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 34 | |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr] 35 | |                 if tail.is_empty() {
[INFO] [stderr] ...  |
[INFO] [stderr] 40 | |             },
[INFO] [stderr] 41 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 32 |         match *self {
[INFO] [stderr] 33 |             List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 34 |             List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:34:26
[INFO] [stderr]    |
[INFO] [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                          -----^^^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `tail:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:34:42
[INFO] [stderr]    |
[INFO] [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                                          -----^^^^^^^^^
[INFO] [stderr]    |                                          |
[INFO] [stderr]    |                                          help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:45:9
[INFO] [stderr]    |
[INFO] [stderr] 45 | /         match self {
[INFO] [stderr] 46 | |             &List::Nil => true,
[INFO] [stderr] 47 | |             &List::List {head: _, tail: _} => false,
[INFO] [stderr] 48 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 45 |         match *self {
[INFO] [stderr] 46 |             List::Nil => true,
[INFO] [stderr] 47 |             List::List {head: _, tail: _} => false,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:88:5
[INFO] [stderr]    |
[INFO] [stderr] 88 | /     match list {
[INFO] [stderr] 89 | |         &List::Nil => println!("list is nil"),
[INFO] [stderr] 90 | |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr] 91 | |             println!("head = {:#?}, tail is {}", head, if tail.is_empty() {
[INFO] [stderr] ...  |
[INFO] [stderr] 97 | |         },
[INFO] [stderr] 98 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 88 |     match *list {
[INFO] [stderr] 89 |         List::Nil => println!("list is nil"),
[INFO] [stderr] 90 |         List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:90:22
[INFO] [stderr]    |
[INFO] [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                      -----^^^^^^^^^
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `tail:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:90:38
[INFO] [stderr]    |
[INFO] [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                                      -----^^^^^^^^^
[INFO] [stderr]    |                                      |
[INFO] [stderr]    |                                      help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/main.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |             count: count,
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `count`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/main.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |             count: count,
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `count`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: You matched a field with a wildcard pattern. Consider using `..` instead
[INFO] [stderr]   --> src/list.rs:27:42
[INFO] [stderr]    |
[INFO] [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |                                          ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unneeded_field_pattern)] on by default
[INFO] [stderr]    = help: Try with `List { head: ref head, .. }`
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: All the struct fields are matched to a wildcard pattern, consider using `..`.
[INFO] [stderr]   --> src/list.rs:47:14
[INFO] [stderr]    |
[INFO] [stderr] 47 |             &List::List {head: _, tail: _} => false,
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Try with `List { .. }` instead
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/list.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | / macro_rules! list {
[INFO] [stderr] 54 | |     ($($n: expr),*) => {
[INFO] [stderr] 55 | |         {
[INFO] [stderr] 56 | |             let mut list = List::empty_list();
[INFO] [stderr] ...  |
[INFO] [stderr] 74 | |     };
[INFO] [stderr] 75 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: You matched a field with a wildcard pattern. Consider using `..` instead
[INFO] [stderr]   --> src/list.rs:27:42
[INFO] [stderr]    |
[INFO] [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |                                          ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unneeded_field_pattern)] on by default
[INFO] [stderr]    = help: Try with `List { head: ref head, .. }`
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: All the struct fields are matched to a wildcard pattern, consider using `..`.
[INFO] [stderr]   --> src/list.rs:47:14
[INFO] [stderr]    |
[INFO] [stderr] 47 |             &List::List {head: _, tail: _} => false,
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Try with `List { .. }` instead
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/list.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | / macro_rules! list {
[INFO] [stderr] 54 | |     ($($n: expr),*) => {
[INFO] [stderr] 55 | |         {
[INFO] [stderr] 56 | |             let mut list = List::empty_list();
[INFO] [stderr] ...  |
[INFO] [stderr] 74 | |     };
[INFO] [stderr] 75 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `head`
[INFO] [stderr]   --> src/list.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn head(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last`
[INFO] [stderr]   --> src/list.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn last(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]   --> src/list.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tailrec`
[INFO] [stderr]   --> src/list.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn tailrec<T: Debug>(list: &List<T>) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 | /         match self {
[INFO] [stderr] 26 | |             &List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 27 | |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr] 28 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 25 |         match *self {
[INFO] [stderr] 26 |             List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 27 |             List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:27:26
[INFO] [stderr]    |
[INFO] [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |                          -----^^^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_shorthand_field_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 | /         match self {
[INFO] [stderr] 33 | |             &List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 34 | |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr] 35 | |                 if tail.is_empty() {
[INFO] [stderr] ...  |
[INFO] [stderr] 40 | |             },
[INFO] [stderr] 41 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 32 |         match *self {
[INFO] [stderr] 33 |             List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 34 |             List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:34:26
[INFO] [stderr]    |
[INFO] [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                          -----^^^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `tail:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:34:42
[INFO] [stderr]    |
[INFO] [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                                          -----^^^^^^^^^
[INFO] [stderr]    |                                          |
[INFO] [stderr]    |                                          help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:45:9
[INFO] [stderr]    |
[INFO] [stderr] 45 | /         match self {
[INFO] [stderr] 46 | |             &List::Nil => true,
[INFO] [stderr] 47 | |             &List::List {head: _, tail: _} => false,
[INFO] [stderr] 48 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 45 |         match *self {
[INFO] [stderr] 46 |             List::Nil => true,
[INFO] [stderr] 47 |             List::List {head: _, tail: _} => false,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:88:5
[INFO] [stderr]    |
[INFO] [stderr] 88 | /     match list {
[INFO] [stderr] 89 | |         &List::Nil => println!("list is nil"),
[INFO] [stderr] 90 | |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr] 91 | |             println!("head = {:#?}, tail is {}", head, if tail.is_empty() {
[INFO] [stderr] ...  |
[INFO] [stderr] 97 | |         },
[INFO] [stderr] 98 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 88 |     match *list {
[INFO] [stderr] 89 |         List::Nil => println!("list is nil"),
[INFO] [stderr] 90 |         List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:90:22
[INFO] [stderr]    |
[INFO] [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                      -----^^^^^^^^^
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `tail:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:90:38
[INFO] [stderr]    |
[INFO] [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                                      -----^^^^^^^^^
[INFO] [stderr]    |                                      |
[INFO] [stderr]    |                                      help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: this `.fold` can be written more succinctly using another method
[INFO] [stderr]   --> src/main.rs:85:30
[INFO] [stderr]    |
[INFO] [stderr] 85 |     println!("{:?}", v.iter().fold(0, |n, m| n + m));
[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: single-character string constant used as pattern
[INFO] [stderr]   --> src/main.rs:86:53
[INFO] [stderr]    |
[INFO] [stderr] 86 |     let split_array: Vec<&str> = array_string.split("_").collect();
[INFO] [stderr]    |                                                     ^^^ help: try using a char instead: `'_'`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_char_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `head`
[INFO] [stderr]   --> src/list.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn head(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last`
[INFO] [stderr]   --> src/list.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn last(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]   --> src/list.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tailrec`
[INFO] [stderr]   --> src/list.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn tailrec<T: Debug>(list: &List<T>) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 | /         match self {
[INFO] [stderr] 26 | |             &List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 27 | |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr] 28 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 25 |         match *self {
[INFO] [stderr] 26 |             List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 27 |             List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:27:26
[INFO] [stderr]    |
[INFO] [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
[INFO] [stderr]    |                          -----^^^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_shorthand_field_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 | /         match self {
[INFO] [stderr] 33 | |             &List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 34 | |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr] 35 | |                 if tail.is_empty() {
[INFO] [stderr] ...  |
[INFO] [stderr] 40 | |             },
[INFO] [stderr] 41 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 32 |         match *self {
[INFO] [stderr] 33 |             List::Nil => panic!("NoSuchElementException"),
[INFO] [stderr] 34 |             List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:34:26
[INFO] [stderr]    |
[INFO] [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                          -----^^^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `tail:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:34:42
[INFO] [stderr]    |
[INFO] [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                                          -----^^^^^^^^^
[INFO] [stderr]    |                                          |
[INFO] [stderr]    |                                          help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:45:9
[INFO] [stderr]    |
[INFO] [stderr] 45 | /         match self {
[INFO] [stderr] 46 | |             &List::Nil => true,
[INFO] [stderr] 47 | |             &List::List {head: _, tail: _} => false,
[INFO] [stderr] 48 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 45 |         match *self {
[INFO] [stderr] 46 |             List::Nil => true,
[INFO] [stderr] 47 |             List::List {head: _, tail: _} => false,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/list.rs:88:5
[INFO] [stderr]    |
[INFO] [stderr] 88 | /     match list {
[INFO] [stderr] 89 | |         &List::Nil => println!("list is nil"),
[INFO] [stderr] 90 | |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr] 91 | |             println!("head = {:#?}, tail is {}", head, if tail.is_empty() {
[INFO] [stderr] ...  |
[INFO] [stderr] 97 | |         },
[INFO] [stderr] 98 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 88 |     match *list {
[INFO] [stderr] 89 |         List::Nil => println!("list is nil"),
[INFO] [stderr] 90 |         List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the `head:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:90:22
[INFO] [stderr]    |
[INFO] [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                      -----^^^^^^^^^
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `tail:` in this pattern is redundant
[INFO] [stderr]   --> src/list.rs:90:38
[INFO] [stderr]    |
[INFO] [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
[INFO] [stderr]    |                                      -----^^^^^^^^^
[INFO] [stderr]    |                                      |
[INFO] [stderr]    |                                      help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: this `.fold` can be written more succinctly using another method
[INFO] [stderr]   --> src/main.rs:85:30
[INFO] [stderr]    |
[INFO] [stderr] 85 |     println!("{:?}", v.iter().fold(0, |n, m| n + m));
[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: single-character string constant used as pattern
[INFO] [stderr]   --> src/main.rs:86:53
[INFO] [stderr]    |
[INFO] [stderr] 86 |     let split_array: Vec<&str> = array_string.split("_").collect();
[INFO] [stderr]    |                                                     ^^^ help: try using a char instead: `'_'`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_char_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.44s
[INFO] running `"docker" "inspect" "d44400c046145e17100707d3239e5a8e23d787cff3fafaef616e7686223ee80c"`
[INFO] running `"docker" "rm" "-f" "d44400c046145e17100707d3239e5a8e23d787cff3fafaef616e7686223ee80c"`
[INFO] [stdout] d44400c046145e17100707d3239e5a8e23d787cff3fafaef616e7686223ee80c