[INFO] crate english-numbers 0.3.3 is already in cache
[INFO] extracting crate english-numbers 0.3.3 into work/ex/clippy-test-run/sources/stable/reg/english-numbers/0.3.3
[INFO] extracting crate english-numbers 0.3.3 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/english-numbers/0.3.3
[INFO] validating manifest of english-numbers-0.3.3 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 english-numbers-0.3.3 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 english-numbers-0.3.3
[INFO] finished frobbing english-numbers-0.3.3
[INFO] frobbed toml for english-numbers-0.3.3 written to work/ex/clippy-test-run/sources/stable/reg/english-numbers/0.3.3/Cargo.toml
[INFO] started frobbing english-numbers-0.3.3
[INFO] finished frobbing english-numbers-0.3.3
[INFO] frobbed toml for english-numbers-0.3.3 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/english-numbers/0.3.3/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 english-numbers-0.3.3 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/reg/english-numbers/0.3.3:/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] 0e1c180c079ea38c3afa4afbb6b87caf52dcc627e48d09c9ac2b39e83c48364c
[INFO] running `"docker" "start" "-a" "0e1c180c079ea38c3afa4afbb6b87caf52dcc627e48d09c9ac2b39e83c48364c"`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]     Checking english-numbers v0.3.3 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/groups.rs:156:29
[INFO] [stderr]     |
[INFO] [stderr] 156 |             (None, None) => return None,
[INFO] [stderr]     |                             ^^^^^^^^^^^ help: remove `return` as shown: `None`
[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/groups.rs:157:34
[INFO] [stderr]     |
[INFO] [stderr] 157 |             (Some(hun), None) => return Some(hun),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(hun)`
[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: unneeded return statement
[INFO] [stderr]    --> src/groups.rs:160:17
[INFO] [stderr]     |
[INFO] [stderr] 160 |                 return Some(ten)
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(ten)`
[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: unneeded return statement
[INFO] [stderr]    --> src/groups.rs:169:17
[INFO] [stderr]     |
[INFO] [stderr] 169 |                 return Some(hun)
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(hun)`
[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: unneeded return statement
[INFO] [stderr]   --> src/hundreds.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 | /         return Some(Words::new(vec![Word::Number(match self.0
[INFO] [stderr] 22 | |         {
[INFO] [stderr] 23 | |             1 => "one",
[INFO] [stderr] 24 | |             2 => "two",
[INFO] [stderr] ...  |
[INFO] [stderr] 34 | |         Word::Space,
[INFO] [stderr] 35 | |         Word::Number("hundred".to_owned())]))
[INFO] [stderr]    | |_____________________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 21 |         Some(Words::new(vec![Word::Number(match self.0
[INFO] [stderr] 22 |         {
[INFO] [stderr] 23 |             1 => "one",
[INFO] [stderr] 24 |             2 => "two",
[INFO] [stderr] 25 |             3 => "three",
[INFO] [stderr] 26 |             4 => "four",
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/tens.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 | /             return Some(Words::new(vec![Word::Number(match self.0 * 10 + self.1
[INFO] [stderr] 29 | |             {
[INFO] [stderr] 30 | |                 1 => "one",
[INFO] [stderr] 31 | |                 2 => "two",
[INFO] [stderr] ...  |
[INFO] [stderr] 49 | |                 _ => unreachable!()
[INFO] [stderr] 50 | |             }.to_owned())]))
[INFO] [stderr]    | |____________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 28 |             Some(Words::new(vec![Word::Number(match self.0 * 10 + self.1
[INFO] [stderr] 29 |             {
[INFO] [stderr] 30 |                 1 => "one",
[INFO] [stderr] 31 |                 2 => "two",
[INFO] [stderr] 32 |                 3 => "three",
[INFO] [stderr] 33 |                 4 => "four",
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/tens.rs:69:17
[INFO] [stderr]    |
[INFO] [stderr] 69 |                 return Some(Words::new(vec![Word::Number(tens.to_owned())]))
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(Words::new(vec![Word::Number(tens.to_owned())]))`
[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: unneeded return statement
[INFO] [stderr]   --> src/tens.rs:88:17
[INFO] [stderr]    |
[INFO] [stderr] 88 | /                 return Some(Words::new(vec![
[INFO] [stderr] 89 | |                     Word::Number(tens.to_owned()),
[INFO] [stderr] 90 | |                     Word::Dash,
[INFO] [stderr] 91 | |                     Word::Number(ones.to_owned())
[INFO] [stderr] 92 | |                 ]))
[INFO] [stderr]    | |___________________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 88 |                 Some(Words::new(vec![
[INFO] [stderr] 89 |                     Word::Number(tens.to_owned()),
[INFO] [stderr] 90 |                     Word::Dash,
[INFO] [stderr] 91 |                     Word::Number(ones.to_owned())
[INFO] [stderr] 92 |                 ]))
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: You are using an explicit closure for cloning elements
[INFO] [stderr]   --> src/groups.rs:26:30
[INFO] [stderr]    |
[INFO] [stderr] 26 |                   .map(|chunk| chunk.into_iter()
[INFO] [stderr]    |  ______________________________^
[INFO] [stderr] 27 | |                     .map(|c| *c)
[INFO] [stderr]    | |________________________________^ help: Consider calling the dedicated `cloned` method: `chunk.into_iter().cloned()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::map_clone)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]   --> src/groups.rs:26:36
[INFO] [stderr]    |
[INFO] [stderr] 26 |                 .map(|chunk| chunk.into_iter()
[INFO] [stderr]    |                                    ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]   --> src/groups.rs:35:22
[INFO] [stderr]    |
[INFO] [stderr] 35 |                 .map(|n| Group::new(n))
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^ help: remove closure as shown: `Group::new`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_closure)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/groups.rs:95:12
[INFO] [stderr]    |
[INFO] [stderr] 95 |         if built.len() == 0
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `built.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: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/groups.rs:186:9
[INFO] [stderr]     |
[INFO] [stderr] 186 | /         match val >= 0
[INFO] [stderr] 187 | |         {
[INFO] [stderr] 188 | |             true => Sign::Positive,
[INFO] [stderr] 189 | |             false => Sign::Negative
[INFO] [stderr] 190 | |         }
[INFO] [stderr]     | |_________^ help: consider using an if/else expression: `if val >= 0 { Sign::Positive } else { Sign::Negative }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_bool)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/words.rs:44:9
[INFO] [stderr]     |
[INFO] [stderr] 44  | /         match self
[INFO] [stderr] 45  | |         {
[INFO] [stderr] 46  | |             &Word::Number(ref n) => if fmt.title_case && n.len() > 0
[INFO] [stderr] 47  | |             {
[INFO] [stderr] ...   |
[INFO] [stderr] 104 | |             }
[INFO] [stderr] 105 | |         }
[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] 44  |         match *self
[INFO] [stderr] 45  |         {
[INFO] [stderr] 46  |             Word::Number(ref n) => if fmt.title_case && n.len() > 0
[INFO] [stderr] 47  |             {
[INFO] [stderr] 48  |                 let first = n.chars().nth(0).unwrap().to_string().to_uppercase();
[INFO] [stderr] 49  |                 let last = &n[1..n.len()];
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/words.rs:46:58
[INFO] [stderr]    |
[INFO] [stderr] 46 |             &Word::Number(ref n) => if fmt.title_case && n.len() > 0
[INFO] [stderr]    |                                                          ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!n.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: unneeded return statement
[INFO] [stderr]    --> src/groups.rs:156:29
[INFO] [stderr]     |
[INFO] [stderr] 156 |             (None, None) => return None,
[INFO] [stderr]     |                             ^^^^^^^^^^^ help: remove `return` as shown: `None`
[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/groups.rs:157:34
[INFO] [stderr]     |
[INFO] [stderr] 157 |             (Some(hun), None) => return Some(hun),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(hun)`
[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: unneeded return statement
[INFO] [stderr]    --> src/groups.rs:160:17
[INFO] [stderr]     |
[INFO] [stderr] 160 |                 return Some(ten)
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(ten)`
[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: unneeded return statement
[INFO] [stderr]    --> src/groups.rs:169:17
[INFO] [stderr]     |
[INFO] [stderr] 169 |                 return Some(hun)
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(hun)`
[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: unneeded return statement
[INFO] [stderr]   --> src/hundreds.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 | /         return Some(Words::new(vec![Word::Number(match self.0
[INFO] [stderr] 22 | |         {
[INFO] [stderr] 23 | |             1 => "one",
[INFO] [stderr] 24 | |             2 => "two",
[INFO] [stderr] ...  |
[INFO] [stderr] 34 | |         Word::Space,
[INFO] [stderr] 35 | |         Word::Number("hundred".to_owned())]))
[INFO] [stderr]    | |_____________________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 21 |         Some(Words::new(vec![Word::Number(match self.0
[INFO] [stderr] 22 |         {
[INFO] [stderr] 23 |             1 => "one",
[INFO] [stderr] 24 |             2 => "two",
[INFO] [stderr] 25 |             3 => "three",
[INFO] [stderr] 26 |             4 => "four",
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/tens.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 | /             return Some(Words::new(vec![Word::Number(match self.0 * 10 + self.1
[INFO] [stderr] 29 | |             {
[INFO] [stderr] 30 | |                 1 => "one",
[INFO] [stderr] 31 | |                 2 => "two",
[INFO] [stderr] ...  |
[INFO] [stderr] 49 | |                 _ => unreachable!()
[INFO] [stderr] 50 | |             }.to_owned())]))
[INFO] [stderr]    | |____________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 28 |             Some(Words::new(vec![Word::Number(match self.0 * 10 + self.1
[INFO] [stderr] 29 |             {
[INFO] [stderr] 30 |                 1 => "one",
[INFO] [stderr] 31 |                 2 => "two",
[INFO] [stderr] 32 |                 3 => "three",
[INFO] [stderr] 33 |                 4 => "four",
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/tens.rs:69:17
[INFO] [stderr]    |
[INFO] [stderr] 69 |                 return Some(Words::new(vec![Word::Number(tens.to_owned())]))
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(Words::new(vec![Word::Number(tens.to_owned())]))`
[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: unneeded return statement
[INFO] [stderr]   --> src/tens.rs:88:17
[INFO] [stderr]    |
[INFO] [stderr] 88 | /                 return Some(Words::new(vec![
[INFO] [stderr] 89 | |                     Word::Number(tens.to_owned()),
[INFO] [stderr] 90 | |                     Word::Dash,
[INFO] [stderr] 91 | |                     Word::Number(ones.to_owned())
[INFO] [stderr] 92 | |                 ]))
[INFO] [stderr]    | |___________________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 88 |                 Some(Words::new(vec![
[INFO] [stderr] 89 |                     Word::Number(tens.to_owned()),
[INFO] [stderr] 90 |                     Word::Dash,
[INFO] [stderr] 91 |                     Word::Number(ones.to_owned())
[INFO] [stderr] 92 |                 ]))
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]   --> src/test.rs:89:44
[INFO] [stderr]    |
[INFO] [stderr] 89 |     let g9223372036854775807 = Groups::new(9223372036854775807); // i64::MAX
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^^^^^^^ help: consider: `9_223_372_036_854_775_807`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unreadable_literal)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/test.rs:112:28
[INFO] [stderr]     |
[INFO] [stderr] 112 |     assert_eq!(Groups::new(1000000).build(true).build(Formatting::all()), "One Milliard");
[INFO] [stderr]     |                            ^^^^^^^ help: consider: `1_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/test.rs:113:28
[INFO] [stderr]     |
[INFO] [stderr] 113 |     assert_eq!(Groups::new(1000000000).build(true).build(Formatting::all()), "One Million");
[INFO] [stderr]     |                            ^^^^^^^^^^ help: consider: `1_000_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/test.rs:114:28
[INFO] [stderr]     |
[INFO] [stderr] 114 |     assert_eq!(Groups::new(1000000000000).build(true).build(Formatting::all()), "One Thousand Million");
[INFO] [stderr]     |                            ^^^^^^^^^^^^^ help: consider: `1_000_000_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/test.rs:115:28
[INFO] [stderr]     |
[INFO] [stderr] 115 |     assert_eq!(Groups::new(1000000000000000).build(true).build(Formatting::all()), "One Billion");
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^ help: consider: `1_000_000_000_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/test.rs:116:28
[INFO] [stderr]     |
[INFO] [stderr] 116 |     assert_eq!(Groups::new(1000000000000000000).build(true).build(Formatting::all()), "One Thousand Billion");
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^ help: consider: `1_000_000_000_000_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/test.rs:126:32
[INFO] [stderr]     |
[INFO] [stderr] 126 |     assert_eq!(convert_all_fmt(100000), "One Hundred Thousand");
[INFO] [stderr]     |                                ^^^^^^ help: consider: `100_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/test.rs:127:32
[INFO] [stderr]     |
[INFO] [stderr] 127 |     assert_eq!(convert_all_fmt(1000000), "One Million");
[INFO] [stderr]     |                                ^^^^^^^ help: consider: `1_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: You are using an explicit closure for cloning elements
[INFO] [stderr]   --> src/groups.rs:26:30
[INFO] [stderr]    |
[INFO] [stderr] 26 |                   .map(|chunk| chunk.into_iter()
[INFO] [stderr]    |  ______________________________^
[INFO] [stderr] 27 | |                     .map(|c| *c)
[INFO] [stderr]    | |________________________________^ help: Consider calling the dedicated `cloned` method: `chunk.into_iter().cloned()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::map_clone)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]   --> src/groups.rs:26:36
[INFO] [stderr]    |
[INFO] [stderr] 26 |                 .map(|chunk| chunk.into_iter()
[INFO] [stderr]    |                                    ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]   --> src/groups.rs:35:22
[INFO] [stderr]    |
[INFO] [stderr] 35 |                 .map(|n| Group::new(n))
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^ help: remove closure as shown: `Group::new`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_closure)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/groups.rs:95:12
[INFO] [stderr]    |
[INFO] [stderr] 95 |         if built.len() == 0
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `built.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: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/groups.rs:186:9
[INFO] [stderr]     |
[INFO] [stderr] 186 | /         match val >= 0
[INFO] [stderr] 187 | |         {
[INFO] [stderr] 188 | |             true => Sign::Positive,
[INFO] [stderr] 189 | |             false => Sign::Negative
[INFO] [stderr] 190 | |         }
[INFO] [stderr]     | |_________^ help: consider using an if/else expression: `if val >= 0 { Sign::Positive } else { Sign::Negative }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_bool)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/words.rs:44:9
[INFO] [stderr]     |
[INFO] [stderr] 44  | /         match self
[INFO] [stderr] 45  | |         {
[INFO] [stderr] 46  | |             &Word::Number(ref n) => if fmt.title_case && n.len() > 0
[INFO] [stderr] 47  | |             {
[INFO] [stderr] ...   |
[INFO] [stderr] 104 | |             }
[INFO] [stderr] 105 | |         }
[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] 44  |         match *self
[INFO] [stderr] 45  |         {
[INFO] [stderr] 46  |             Word::Number(ref n) => if fmt.title_case && n.len() > 0
[INFO] [stderr] 47  |             {
[INFO] [stderr] 48  |                 let first = n.chars().nth(0).unwrap().to_string().to_uppercase();
[INFO] [stderr] 49  |                 let last = &n[1..n.len()];
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/words.rs:46:58
[INFO] [stderr]    |
[INFO] [stderr] 46 |             &Word::Number(ref n) => if fmt.title_case && n.len() > 0
[INFO] [stderr]    |                                                          ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!n.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 1.69s
[INFO] running `"docker" "inspect" "0e1c180c079ea38c3afa4afbb6b87caf52dcc627e48d09c9ac2b39e83c48364c"`
[INFO] running `"docker" "rm" "-f" "0e1c180c079ea38c3afa4afbb6b87caf52dcc627e48d09c9ac2b39e83c48364c"`
[INFO] [stdout] 0e1c180c079ea38c3afa4afbb6b87caf52dcc627e48d09c9ac2b39e83c48364c