[INFO] updating cached repository scotto3394/sm_project_euler
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/scotto3394/sm_project_euler
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/scotto3394/sm_project_euler" "work/ex/clippy-test-run/sources/stable/gh/scotto3394/sm_project_euler"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/scotto3394/sm_project_euler'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/scotto3394/sm_project_euler" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/scotto3394/sm_project_euler"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/scotto3394/sm_project_euler'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 621a5d3ca46474a751aaa63a8e5b49df12817f0e
[INFO] sha for GitHub repo scotto3394/sm_project_euler: 621a5d3ca46474a751aaa63a8e5b49df12817f0e
[INFO] validating manifest of scotto3394/sm_project_euler 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 scotto3394/sm_project_euler 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 scotto3394/sm_project_euler
[INFO] finished frobbing scotto3394/sm_project_euler
[INFO] frobbed toml for scotto3394/sm_project_euler written to work/ex/clippy-test-run/sources/stable/gh/scotto3394/sm_project_euler/Cargo.toml
[INFO] started frobbing scotto3394/sm_project_euler
[INFO] finished frobbing scotto3394/sm_project_euler
[INFO] frobbed toml for scotto3394/sm_project_euler written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/scotto3394/sm_project_euler/Cargo.toml
[INFO] crate scotto3394/sm_project_euler 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 scotto3394/sm_project_euler 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/scotto3394/sm_project_euler:/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] 31e2d3c2ac0f7c8a9715824bdddafa32977eaf0d8ab799e37d4ebcf9c91b16cb
[INFO] running `"docker" "start" "-a" "31e2d3c2ac0f7c8a9715824bdddafa32977eaf0d8ab799e37d4ebcf9c91b16cb"`
[INFO] [stderr]     Checking project_euler v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]    --> src/solutions.rs:282:5
[INFO] [stderr]     |
[INFO] [stderr] 282 |     solution
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::let_and_return)] on by default
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]    --> src/solutions.rs:278:20
[INFO] [stderr]     |
[INFO] [stderr] 278 |       let solution = match triples.iter().max() {
[INFO] [stderr]     |  ____________________^
[INFO] [stderr] 279 | |         Some(num) => *num,
[INFO] [stderr] 280 | |         None      => -1_i64,
[INFO] [stderr] 281 | |     };
[INFO] [stderr]     | |_____^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/solutions.rs:383:13
[INFO] [stderr]     |
[INFO] [stderr] 383 |             return 0_i64;
[INFO] [stderr]     |             ^^^^^^^^^^^^^ help: remove `return` as shown: `0_i64`
[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/solutions.rs:396:13
[INFO] [stderr]     |
[INFO] [stderr] 396 |             return 0_i64;
[INFO] [stderr]     |             ^^^^^^^^^^^^^ help: remove `return` as shown: `0_i64`
[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/solutions.rs:409:13
[INFO] [stderr]     |
[INFO] [stderr] 409 |             return 0_i64;
[INFO] [stderr]     |             ^^^^^^^^^^^^^ help: remove `return` as shown: `0_i64`
[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/solutions.rs:423:13
[INFO] [stderr]     |
[INFO] [stderr] 423 |             return 0_i64;
[INFO] [stderr]     |             ^^^^^^^^^^^^^ help: remove `return` as shown: `0_i64`
[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: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/solutions.rs:521:16
[INFO] [stderr]     |
[INFO] [stderr] 521 |           } else {
[INFO] [stderr]     |  ________________^
[INFO] [stderr] 522 | |             if index % 2 == 0 {
[INFO] [stderr] 523 | |                 divisor_count = cache.get(index/2) * cache.get(index+1);
[INFO] [stderr] 524 | |             } else {
[INFO] [stderr] 525 | |                 divisor_count = cache.get(index) * cache.get((index + 1)/2);
[INFO] [stderr] 526 | |             }
[INFO] [stderr] 527 | |         }
[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] 521 |         } else if index % 2 == 0 {
[INFO] [stderr] 522 |     divisor_count = cache.get(index/2) * cache.get(index+1);
[INFO] [stderr] 523 | } else {
[INFO] [stderr] 524 |     divisor_count = cache.get(index) * cache.get((index + 1)/2);
[INFO] [stderr] 525 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]    --> src/solutions.rs:282:5
[INFO] [stderr]     |
[INFO] [stderr] 282 |     solution
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::let_and_return)] on by default
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]    --> src/solutions.rs:278:20
[INFO] [stderr]     |
[INFO] [stderr] 278 |       let solution = match triples.iter().max() {
[INFO] [stderr]     |  ____________________^
[INFO] [stderr] 279 | |         Some(num) => *num,
[INFO] [stderr] 280 | |         None      => -1_i64,
[INFO] [stderr] 281 | |     };
[INFO] [stderr]     | |_____^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/solutions.rs:383:13
[INFO] [stderr]     |
[INFO] [stderr] 383 |             return 0_i64;
[INFO] [stderr]     |             ^^^^^^^^^^^^^ help: remove `return` as shown: `0_i64`
[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/solutions.rs:396:13
[INFO] [stderr]     |
[INFO] [stderr] 396 |             return 0_i64;
[INFO] [stderr]     |             ^^^^^^^^^^^^^ help: remove `return` as shown: `0_i64`
[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/solutions.rs:409:13
[INFO] [stderr]     |
[INFO] [stderr] 409 |             return 0_i64;
[INFO] [stderr]     |             ^^^^^^^^^^^^^ help: remove `return` as shown: `0_i64`
[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/solutions.rs:423:13
[INFO] [stderr]     |
[INFO] [stderr] 423 |             return 0_i64;
[INFO] [stderr]     |             ^^^^^^^^^^^^^ help: remove `return` as shown: `0_i64`
[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: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/solutions.rs:521:16
[INFO] [stderr]     |
[INFO] [stderr] 521 |           } else {
[INFO] [stderr]     |  ________________^
[INFO] [stderr] 522 | |             if index % 2 == 0 {
[INFO] [stderr] 523 | |                 divisor_count = cache.get(index/2) * cache.get(index+1);
[INFO] [stderr] 524 | |             } else {
[INFO] [stderr] 525 | |                 divisor_count = cache.get(index) * cache.get((index + 1)/2);
[INFO] [stderr] 526 | |             }
[INFO] [stderr] 527 | |         }
[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] 521 |         } else if index % 2 == 0 {
[INFO] [stderr] 522 |     divisor_count = cache.get(index/2) * cache.get(index+1);
[INFO] [stderr] 523 | } else {
[INFO] [stderr] 524 |     divisor_count = cache.get(index) * cache.get((index + 1)/2);
[INFO] [stderr] 525 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]   --> src/tests.rs:90:12
[INFO] [stderr]    |
[INFO] [stderr] 90 | assert_eq!(73812150, grid_prod(grid, 4_usize));
[INFO] [stderr]    |            ^^^^^^^^ help: consider: `73_812_150`
[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: you should consider deriving a `Default` implementation for `solutions::FibThree`
[INFO] [stderr]   --> src/solutions.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 | /     pub fn new() -> FibThree {
[INFO] [stderr] 51 | |         FibThree {fib_pair: [0,1]}
[INFO] [stderr] 52 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 45 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/solutions.rs:115:13
[INFO] [stderr]     |
[INFO] [stderr] 115 |             target = target / ind;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `target /= ind`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/solutions.rs:145:32
[INFO] [stderr]     |
[INFO] [stderr] 145 |     let mut list: Vec<usize> = (1..(range_n+1)).collect();
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^ help: use: `(1..=range_n)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::range_plus_one)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is only used to index `list`.
[INFO] [stderr]    --> src/solutions.rs:152:18
[INFO] [stderr]     |
[INFO] [stderr] 152 |         for i in index..range_n {
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]     |
[INFO] [stderr] 152 |         for <item> in list.iter_mut().take(range_n).skip(index) {
[INFO] [stderr]     |             ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:218:26
[INFO] [stderr]     |
[INFO] [stderr] 218 |           let digit: i64 = c.to_digit(10)
[INFO] [stderr]     |  __________________________^
[INFO] [stderr] 219 | |                           .unwrap() as i64;
[INFO] [stderr]     | |__________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 218 |         let digit: i64 = i64::from(c.to_digit(10)
[INFO] [stderr] 219 |                           .unwrap());
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:227:26
[INFO] [stderr]     |
[INFO] [stderr] 227 |           let digit: i64 = c.to_digit(10)
[INFO] [stderr]     |  __________________________^
[INFO] [stderr] 228 | |                           .unwrap() as i64;
[INFO] [stderr]     | |__________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 227 |         let digit: i64 = i64::from(c.to_digit(10)
[INFO] [stderr] 228 |                           .unwrap());
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: this `.fold` can be written more succinctly using another method
[INFO] [stderr]    --> src/solutions.rs:234:33
[INFO] [stderr]     |
[INFO] [stderr] 234 |               prod = digits.iter()
[INFO] [stderr]     |  _________________________________^
[INFO] [stderr] 235 | |             .fold(1, |prod,dig| prod * dig);
[INFO] [stderr]     | |___________________________________________^ help: try: `.product()`
[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: manual implementation of an assign operation
[INFO] [stderr]    --> src/solutions.rs:237:13
[INFO] [stderr]     |
[INFO] [stderr] 237 |             prod = prod / divide;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^ help: replace it with: `prod /= divide`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/solutions.rs:269:14
[INFO] [stderr]     |
[INFO] [stderr] 269 |     for a in 1..(n/2 + 1) {
[INFO] [stderr]     |              ^^^^^^^^^^^^ help: use: `1..=n/2`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:275:26
[INFO] [stderr]     |
[INFO] [stderr] 275 |             triples.push((a*b*c) as i64);
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^ help: try: `i64::from(a*b*c)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `solutions::PrimeCache`
[INFO] [stderr]    --> src/solutions.rs:296:5
[INFO] [stderr]     |
[INFO] [stderr] 296 | /     pub fn new() -> PrimeCache {
[INFO] [stderr] 297 | |         PrimeCache { primes: vec![2,3,5,7], bookmark: 8}
[INFO] [stderr] 298 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 290 | #[derive(Default)]
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/solutions.rs:350:5
[INFO] [stderr]     |
[INFO] [stderr] 350 | /     loop {
[INFO] [stderr] 351 | |         let prime = match primes.next() {
[INFO] [stderr] 352 | |             Some(num) => *num,
[INFO] [stderr] 353 | |             None      => {break},
[INFO] [stderr] ...   |
[INFO] [stderr] 356 | |         total += prime;
[INFO] [stderr] 357 | |     }
[INFO] [stderr]     | |_____^ help: try: `while let Some(num) = primes.next() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::while_let_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/solutions.rs:380:24
[INFO] [stderr]     |
[INFO] [stderr] 380 |     fn mult_down(grid: &Vec<Vec<i32>>, coord: (usize,usize), k: usize) -> i64 {
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^ help: change this to: `&[Vec<i32>]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:390:13
[INFO] [stderr]     |
[INFO] [stderr] 390 |             total as i64
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: try: `i64::from(total)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/solutions.rs:393:25
[INFO] [stderr]     |
[INFO] [stderr] 393 |     fn mult_right(grid: &Vec<Vec<i32>>, coord: (usize,usize), k: usize) -> i64 {
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^ help: change this to: `&[Vec<i32>]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:403:13
[INFO] [stderr]     |
[INFO] [stderr] 403 |             total as i64
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: try: `i64::from(total)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/solutions.rs:406:30
[INFO] [stderr]     |
[INFO] [stderr] 406 |     fn mult_down_right(grid: &Vec<Vec<i32>>, coord: (usize,usize), k: usize) -> i64{
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^ help: change this to: `&[Vec<i32>]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:416:13
[INFO] [stderr]     |
[INFO] [stderr] 416 |             total as i64
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: try: `i64::from(total)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/solutions.rs:420:28
[INFO] [stderr]     |
[INFO] [stderr] 420 |     fn mult_up_right(grid: &Vec<Vec<i32>>, coord: (usize,usize), k: usize) -> i64{
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^ help: change this to: `&[Vec<i32>]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:430:13
[INFO] [stderr]     |
[INFO] [stderr] 430 |             total as i64
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: try: `i64::from(total)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `solutions::DivisorCache`
[INFO] [stderr]    --> src/solutions.rs:462:5
[INFO] [stderr]     |
[INFO] [stderr] 462 | /     pub fn new() -> DivisorCache {
[INFO] [stderr] 463 | |         let mut cache = HashMap::new();
[INFO] [stderr] 464 | |         cache.insert(1,1);
[INFO] [stderr] 465 | |         cache.insert(2,2);
[INFO] [stderr] 466 | |         DivisorCache { divisors: cache }
[INFO] [stderr] 467 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 457 | #[derive(Default)]
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]    --> src/solutions.rs:480:9
[INFO] [stderr]     |
[INFO] [stderr] 480 | /         if !self.divisors.contains_key(&key) {
[INFO] [stderr] 481 | |             let mut local_divisors = vec![1_i64, key];
[INFO] [stderr] 482 | |             let mut test = 2_i64;
[INFO] [stderr] 483 | |             let check = key;
[INFO] [stderr] ...   |
[INFO] [stderr] 493 | |             self.divisors.insert(key,local_divisors.len() as i64);
[INFO] [stderr] 494 | |         }
[INFO] [stderr]     | |_________^ help: consider using: `self.divisors.entry(key)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_entry)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/solutions.rs:495:10
[INFO] [stderr]     |
[INFO] [stderr] 495 |         *self.divisors.get(&key).unwrap()
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.divisors[&key]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `solutions::CollatzCache`
[INFO] [stderr]    --> src/solutions.rs:546:5
[INFO] [stderr]     |
[INFO] [stderr] 546 | /     pub fn new() -> CollatzCache {
[INFO] [stderr] 547 | |         let mut cache = HashMap::new();
[INFO] [stderr] 548 | |         cache.insert(1,1);
[INFO] [stderr] 549 | |         CollatzCache{ collatz: cache }
[INFO] [stderr] 550 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 541 | #[derive(Default)]
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/solutions.rs:565:36
[INFO] [stderr]     |
[INFO] [stderr] 565 |                     base_offset = *self.collatz.get(&current).unwrap();
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.collatz[&current]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/solutions.rs:572:22
[INFO] [stderr]     |
[INFO] [stderr] 572 |             for i in 1..(offset+1) {
[INFO] [stderr]     |                      ^^^^^^^^^^^^^ help: use: `1..=offset`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/solutions.rs:578:10
[INFO] [stderr]     |
[INFO] [stderr] 578 |         *self.collatz.get(&key).unwrap()
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.collatz[&key]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/solutions.rs:585:5
[INFO] [stderr]     |
[INFO] [stderr] 585 |     ((n/2)..(n+1)).map(|x| cache.get(x))
[INFO] [stderr]     |     ^^^^^^^^^^^^^^ help: use: `((n/2)..=n)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: Err(_) will match all errors, maybe not a good idea
[INFO] [stderr]   --> src/lib.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         Err(_) => panic!("Not a number!")
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_wild_err_arm)] on by default
[INFO] [stderr]    = note: to remove this warning, match each error separately or use unreachable macro
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_wild_err_arm
[INFO] [stderr] 
[INFO] [stderr] warning: Err(_) will match all errors, maybe not a good idea
[INFO] [stderr]   --> src/lib.rs:27:17
[INFO] [stderr]    |
[INFO] [stderr] 27 |                 Err(_)  => panic!("Not a number.")
[INFO] [stderr]    |                 ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: to remove this warning, match each error separately or use unreachable macro
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_wild_err_arm
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `solutions::FibThree`
[INFO] [stderr]   --> src/solutions.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 | /     pub fn new() -> FibThree {
[INFO] [stderr] 51 | |         FibThree {fib_pair: [0,1]}
[INFO] [stderr] 52 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 45 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/solutions.rs:115:13
[INFO] [stderr]     |
[INFO] [stderr] 115 |             target = target / ind;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `target /= ind`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/solutions.rs:145:32
[INFO] [stderr]     |
[INFO] [stderr] 145 |     let mut list: Vec<usize> = (1..(range_n+1)).collect();
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^ help: use: `(1..=range_n)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::range_plus_one)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is only used to index `list`.
[INFO] [stderr]    --> src/solutions.rs:152:18
[INFO] [stderr]     |
[INFO] [stderr] 152 |         for i in index..range_n {
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]     |
[INFO] [stderr] 152 |         for <item> in list.iter_mut().take(range_n).skip(index) {
[INFO] [stderr]     |             ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:218:26
[INFO] [stderr]     |
[INFO] [stderr] 218 |           let digit: i64 = c.to_digit(10)
[INFO] [stderr]     |  __________________________^
[INFO] [stderr] 219 | |                           .unwrap() as i64;
[INFO] [stderr]     | |__________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 218 |         let digit: i64 = i64::from(c.to_digit(10)
[INFO] [stderr] 219 |                           .unwrap());
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:227:26
[INFO] [stderr]     |
[INFO] [stderr] 227 |           let digit: i64 = c.to_digit(10)
[INFO] [stderr]     |  __________________________^
[INFO] [stderr] 228 | |                           .unwrap() as i64;
[INFO] [stderr]     | |__________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 227 |         let digit: i64 = i64::from(c.to_digit(10)
[INFO] [stderr] 228 |                           .unwrap());
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: this `.fold` can be written more succinctly using another method
[INFO] [stderr]    --> src/solutions.rs:234:33
[INFO] [stderr]     |
[INFO] [stderr] 234 |               prod = digits.iter()
[INFO] [stderr]     |  _________________________________^
[INFO] [stderr] 235 | |             .fold(1, |prod,dig| prod * dig);
[INFO] [stderr]     | |___________________________________________^ help: try: `.product()`
[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: manual implementation of an assign operation
[INFO] [stderr]    --> src/solutions.rs:237:13
[INFO] [stderr]     |
[INFO] [stderr] 237 |             prod = prod / divide;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^ help: replace it with: `prod /= divide`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/solutions.rs:269:14
[INFO] [stderr]     |
[INFO] [stderr] 269 |     for a in 1..(n/2 + 1) {
[INFO] [stderr]     |              ^^^^^^^^^^^^ help: use: `1..=n/2`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:275:26
[INFO] [stderr]     |
[INFO] [stderr] 275 |             triples.push((a*b*c) as i64);
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^ help: try: `i64::from(a*b*c)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `solutions::PrimeCache`
[INFO] [stderr]    --> src/solutions.rs:296:5
[INFO] [stderr]     |
[INFO] [stderr] 296 | /     pub fn new() -> PrimeCache {
[INFO] [stderr] 297 | |         PrimeCache { primes: vec![2,3,5,7], bookmark: 8}
[INFO] [stderr] 298 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 290 | #[derive(Default)]
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/solutions.rs:350:5
[INFO] [stderr]     |
[INFO] [stderr] 350 | /     loop {
[INFO] [stderr] 351 | |         let prime = match primes.next() {
[INFO] [stderr] 352 | |             Some(num) => *num,
[INFO] [stderr] 353 | |             None      => {break},
[INFO] [stderr] ...   |
[INFO] [stderr] 356 | |         total += prime;
[INFO] [stderr] 357 | |     }
[INFO] [stderr]     | |_____^ help: try: `while let Some(num) = primes.next() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::while_let_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/solutions.rs:380:24
[INFO] [stderr]     |
[INFO] [stderr] 380 |     fn mult_down(grid: &Vec<Vec<i32>>, coord: (usize,usize), k: usize) -> i64 {
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^ help: change this to: `&[Vec<i32>]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:390:13
[INFO] [stderr]     |
[INFO] [stderr] 390 |             total as i64
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: try: `i64::from(total)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/solutions.rs:393:25
[INFO] [stderr]     |
[INFO] [stderr] 393 |     fn mult_right(grid: &Vec<Vec<i32>>, coord: (usize,usize), k: usize) -> i64 {
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^ help: change this to: `&[Vec<i32>]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:403:13
[INFO] [stderr]     |
[INFO] [stderr] 403 |             total as i64
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: try: `i64::from(total)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/solutions.rs:406:30
[INFO] [stderr]     |
[INFO] [stderr] 406 |     fn mult_down_right(grid: &Vec<Vec<i32>>, coord: (usize,usize), k: usize) -> i64{
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^ help: change this to: `&[Vec<i32>]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:416:13
[INFO] [stderr]     |
[INFO] [stderr] 416 |             total as i64
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: try: `i64::from(total)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/solutions.rs:420:28
[INFO] [stderr]     |
[INFO] [stderr] 420 |     fn mult_up_right(grid: &Vec<Vec<i32>>, coord: (usize,usize), k: usize) -> i64{
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^ help: change this to: `&[Vec<i32>]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/solutions.rs:430:13
[INFO] [stderr]     |
[INFO] [stderr] 430 |             total as i64
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: try: `i64::from(total)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `solutions::DivisorCache`
[INFO] [stderr]    --> src/solutions.rs:462:5
[INFO] [stderr]     |
[INFO] [stderr] 462 | /     pub fn new() -> DivisorCache {
[INFO] [stderr] 463 | |         let mut cache = HashMap::new();
[INFO] [stderr] 464 | |         cache.insert(1,1);
[INFO] [stderr] 465 | |         cache.insert(2,2);
[INFO] [stderr] 466 | |         DivisorCache { divisors: cache }
[INFO] [stderr] 467 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 457 | #[derive(Default)]
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]    --> src/solutions.rs:480:9
[INFO] [stderr]     |
[INFO] [stderr] 480 | /         if !self.divisors.contains_key(&key) {
[INFO] [stderr] 481 | |             let mut local_divisors = vec![1_i64, key];
[INFO] [stderr] 482 | |             let mut test = 2_i64;
[INFO] [stderr] 483 | |             let check = key;
[INFO] [stderr] ...   |
[INFO] [stderr] 493 | |             self.divisors.insert(key,local_divisors.len() as i64);
[INFO] [stderr] 494 | |         }
[INFO] [stderr]     | |_________^ help: consider using: `self.divisors.entry(key)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_entry)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/solutions.rs:495:10
[INFO] [stderr]     |
[INFO] [stderr] 495 |         *self.divisors.get(&key).unwrap()
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.divisors[&key]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `solutions::CollatzCache`
[INFO] [stderr]    --> src/solutions.rs:546:5
[INFO] [stderr]     |
[INFO] [stderr] 546 | /     pub fn new() -> CollatzCache {
[INFO] [stderr] 547 | |         let mut cache = HashMap::new();
[INFO] [stderr] 548 | |         cache.insert(1,1);
[INFO] [stderr] 549 | |         CollatzCache{ collatz: cache }
[INFO] [stderr] 550 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 541 | #[derive(Default)]
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/solutions.rs:565:36
[INFO] [stderr]     |
[INFO] [stderr] 565 |                     base_offset = *self.collatz.get(&current).unwrap();
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.collatz[&current]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/solutions.rs:572:22
[INFO] [stderr]     |
[INFO] [stderr] 572 |             for i in 1..(offset+1) {
[INFO] [stderr]     |                      ^^^^^^^^^^^^^ help: use: `1..=offset`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/solutions.rs:578:10
[INFO] [stderr]     |
[INFO] [stderr] 578 |         *self.collatz.get(&key).unwrap()
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.collatz[&key]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/solutions.rs:585:5
[INFO] [stderr]     |
[INFO] [stderr] 585 |     ((n/2)..(n+1)).map(|x| cache.get(x))
[INFO] [stderr]     |     ^^^^^^^^^^^^^^ help: use: `((n/2)..=n)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: Err(_) will match all errors, maybe not a good idea
[INFO] [stderr]   --> src/lib.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         Err(_) => panic!("Not a number!")
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_wild_err_arm)] on by default
[INFO] [stderr]    = note: to remove this warning, match each error separately or use unreachable macro
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_wild_err_arm
[INFO] [stderr] 
[INFO] [stderr] warning: Err(_) will match all errors, maybe not a good idea
[INFO] [stderr]   --> src/lib.rs:27:17
[INFO] [stderr]    |
[INFO] [stderr] 27 |                 Err(_)  => panic!("Not a number.")
[INFO] [stderr]    |                 ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: to remove this warning, match each error separately or use unreachable macro
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_wild_err_arm
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.48s
[INFO] running `"docker" "inspect" "31e2d3c2ac0f7c8a9715824bdddafa32977eaf0d8ab799e37d4ebcf9c91b16cb"`
[INFO] running `"docker" "rm" "-f" "31e2d3c2ac0f7c8a9715824bdddafa32977eaf0d8ab799e37d4ebcf9c91b16cb"`
[INFO] [stdout] 31e2d3c2ac0f7c8a9715824bdddafa32977eaf0d8ab799e37d4ebcf9c91b16cb