[INFO] updating cached repository AugustinLF/advent-of-code-2018
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/AugustinLF/advent-of-code-2018
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/AugustinLF/advent-of-code-2018" "work/ex/clippy-test-run/sources/stable/gh/AugustinLF/advent-of-code-2018"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/AugustinLF/advent-of-code-2018'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/AugustinLF/advent-of-code-2018" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/AugustinLF/advent-of-code-2018"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/AugustinLF/advent-of-code-2018'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d2b26e4b9904cb85adbe2a6301b9bba5f679b215
[INFO] sha for GitHub repo AugustinLF/advent-of-code-2018: d2b26e4b9904cb85adbe2a6301b9bba5f679b215
[INFO] validating manifest of AugustinLF/advent-of-code-2018 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 AugustinLF/advent-of-code-2018 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 AugustinLF/advent-of-code-2018
[INFO] finished frobbing AugustinLF/advent-of-code-2018
[INFO] frobbed toml for AugustinLF/advent-of-code-2018 written to work/ex/clippy-test-run/sources/stable/gh/AugustinLF/advent-of-code-2018/Cargo.toml
[INFO] started frobbing AugustinLF/advent-of-code-2018
[INFO] finished frobbing AugustinLF/advent-of-code-2018
[INFO] frobbed toml for AugustinLF/advent-of-code-2018 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/AugustinLF/advent-of-code-2018/Cargo.toml
[INFO] crate AugustinLF/advent-of-code-2018 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 AugustinLF/advent-of-code-2018 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-4/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/AugustinLF/advent-of-code-2018:/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] 3a8a498dabb35117e437e58274c57e3d0b3d5587d1e8f62a80b611b6d0f22299
[INFO] running `"docker" "start" "-a" "3a8a498dabb35117e437e58274c57e3d0b3d5587d1e8f62a80b611b6d0f22299"`
[INFO] [stderr]     Checking advent-of-code-2018 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/ex1.rs:7:5
[INFO] [stderr]    |
[INFO] [stderr] 7  | /     return match elem {
[INFO] [stderr] 8  | |         Some(value) => generate_frequency(initial_frequency + value, input),
[INFO] [stderr] 9  | |         None => initial_frequency,
[INFO] [stderr] 10 | |     };
[INFO] [stderr]    | |______^
[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] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 7  |     match elem {
[INFO] [stderr] 8  |         Some(value) => generate_frequency(initial_frequency + value, input),
[INFO] [stderr] 9  |         None => initial_frequency,
[INFO] [stderr] 10 |     }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/ex1.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     return input;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `input`
[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/ex1.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     return process(0, input);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `process(0, input)`
[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/ex2.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     return (doubles, triplets);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(doubles, triplets)`
[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/ex2.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     return val.0 * val.1;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `val.0 * val.1`
[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/ex2.rs:30:17
[INFO] [stderr]    |
[INFO] [stderr] 30 |                 return (acc.0 + doubles, acc.1 + triplets);
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(acc.0 + doubles, acc.1 + triplets)`
[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/ex2.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     return ids;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `ids`
[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/ex2.rs:78:5
[INFO] [stderr]    |
[INFO] [stderr] 78 |     return find_base_id(new_ids);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `find_base_id(new_ids)`
[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/ex2.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     return calculate_checksum(ids);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `calculate_checksum(ids)`
[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/ex2.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     return find_base_id(ids);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `find_base_id(ids)`
[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/ex3.rs:57:5
[INFO] [stderr]    |
[INFO] [stderr] 57 |     return fabric;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^ help: remove `return` as shown: `fabric`
[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/ex3.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 | /     return match claims.pop() {
[INFO] [stderr] 65 | |         Some(claim) => get_covered_fabric_for_claims(claims, get_covered_fabric(claim, fabric)),
[INFO] [stderr] 66 | |         None => fabric,
[INFO] [stderr] 67 | |     };
[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] 64 |     match claims.pop() {
[INFO] [stderr] 65 |         Some(claim) => get_covered_fabric_for_claims(claims, get_covered_fabric(claim, fabric)),
[INFO] [stderr] 66 |         None => fabric,
[INFO] [stderr] 67 |     }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/ex3.rs:78:5
[INFO] [stderr]    |
[INFO] [stderr] 78 |     return count;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `count`
[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/ex3.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     return find_fabric_for_claims(claims);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `find_fabric_for_claims(claims)`
[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: function is never used: `generate_frequency`
[INFO] [stderr]  --> src/ex1.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn generate_frequency(initial_frequency: i32, mut input: Vec<i32>) -> i32 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `from_string_to_frequencies`
[INFO] [stderr]   --> src/ex1.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn from_string_to_frequencies(content: String) -> Vec<i32> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `solve_exercise`
[INFO] [stderr]   --> src/ex1.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | pub fn solve_exercise(process: fn(i32, Vec<i32>) -> i32) -> i32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_repeated_frequency`
[INFO] [stderr]   --> src/ex1.rs:35:1
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn find_repeated_frequency(base_frequency: i32, input: Vec<i32>) -> i32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_product_checksum`
[INFO] [stderr]  --> src/ex2.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn get_product_checksum(id: &str) -> (i32, i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_checksum`
[INFO] [stderr]   --> src/ex2.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn calculate_checksum(ids: Vec<String>) -> i32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `are_ids_similar`
[INFO] [stderr]   --> src/ex2.rs:35:1
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn are_ids_similar<'a>(first: &'a str, second: &'a str) -> Option<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_ids`
[INFO] [stderr]   --> src/ex2.rs:57:1
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn get_ids() -> Vec<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_base_id`
[INFO] [stderr]   --> src/ex2.rs:67:1
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn find_base_id(mut ids: Vec<String>) -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `solve_exercise_1`
[INFO] [stderr]   --> src/ex2.rs:81:1
[INFO] [stderr]    |
[INFO] [stderr] 81 | pub fn solve_exercise_1() -> i32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `solve_exercise_2`
[INFO] [stderr]   --> src/ex2.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | pub fn solve_exercise_2() -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_claim`
[INFO] [stderr]   --> src/ex3.rs:16:1
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn parse_claim<'a>(claim: &'a str) -> Claim<'a> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_covered_fabric`
[INFO] [stderr]   --> src/ex3.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | fn get_covered_fabric(claim: Claim, mut fabric: HashMap<String, u16>) -> HashMap<String, u16> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_covered_fabric_for_claims`
[INFO] [stderr]   --> src/ex3.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | / fn get_covered_fabric_for_claims(
[INFO] [stderr] 61 | |     mut claims: Vec<Claim>,
[INFO] [stderr] 62 | |     fabric: HashMap<String, u16>,
[INFO] [stderr] 63 | | ) -> HashMap<String, u16> {
[INFO] [stderr] ...  |
[INFO] [stderr] 67 | |     };
[INFO] [stderr] 68 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_fabric_for_claims`
[INFO] [stderr]   --> src/ex3.rs:70:1
[INFO] [stderr]    |
[INFO] [stderr] 70 | fn find_fabric_for_claims(claims: Vec<Claim>) -> u32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `solve_exercise_1`
[INFO] [stderr]   --> src/ex3.rs:81:1
[INFO] [stderr]    |
[INFO] [stderr] 81 | pub fn solve_exercise_1() -> u32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]   --> src/ex1.rs:43:13
[INFO] [stderr]    |
[INFO] [stderr] 43 | /             if found_frequencies.contains_key(&current_frequency) {
[INFO] [stderr] 44 | |                 return current_frequency;
[INFO] [stderr] 45 | |             } else {
[INFO] [stderr] 46 | |                 found_frequencies.insert(current_frequency, true);
[INFO] [stderr] 47 | |             };
[INFO] [stderr]    | |_____________^ help: consider using: `found_frequencies.entry(current_frequency)`
[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: this loop could be written as a `for` loop
[INFO] [stderr]   --> src/ex2.rs:41:34
[INFO] [stderr]    |
[INFO] [stderr] 41 |     while let Some(first_char) = first.next() {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^ help: try: `for first_char in first { .. }`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::while_let_on_iterator)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_on_iterator
[INFO] [stderr] 
[INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
[INFO] [stderr]   --> src/ex3.rs:16:1
[INFO] [stderr]    |
[INFO] [stderr] 16 | / fn parse_claim<'a>(claim: &'a str) -> Claim<'a> {
[INFO] [stderr] 17 | |     let mut split_str = claim.split_whitespace();
[INFO] [stderr] 18 | |
[INFO] [stderr] 19 | |     let (_, id) = split_str.next().unwrap().split_at(1);
[INFO] [stderr] ...  |
[INFO] [stderr] 42 | |     }
[INFO] [stderr] 43 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_lifetimes)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]   --> src/ex3.rs:30:16
[INFO] [stderr]    |
[INFO] [stderr] 30 |         .split(",");
[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: single-character string constant used as pattern
[INFO] [stderr]   --> src/ex3.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 27 |         .split(":")
[INFO] [stderr]    |                ^^^ help: try using a char instead: `':'`
[INFO] [stderr]    |
[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: single-character string constant used as pattern
[INFO] [stderr]   --> src/ex3.rs:34:52
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let mut size = split_str.next().unwrap().split("x");
[INFO] [stderr]    |                                                    ^^^ help: try using a char instead: `'x'`
[INFO] [stderr]    |
[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: unneeded return statement
[INFO] [stderr]   --> src/ex1.rs:7:5
[INFO] [stderr]    |
[INFO] [stderr] 7  | /     return match elem {
[INFO] [stderr] 8  | |         Some(value) => generate_frequency(initial_frequency + value, input),
[INFO] [stderr] 9  | |         None => initial_frequency,
[INFO] [stderr] 10 | |     };
[INFO] [stderr]    | |______^
[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] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 7  |     match elem {
[INFO] [stderr] 8  |         Some(value) => generate_frequency(initial_frequency + value, input),
[INFO] [stderr] 9  |         None => initial_frequency,
[INFO] [stderr] 10 |     }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/ex1.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     return input;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `input`
[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/ex1.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     return process(0, input);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `process(0, input)`
[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/ex2.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     return (doubles, triplets);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(doubles, triplets)`
[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/ex2.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     return val.0 * val.1;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `val.0 * val.1`
[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/ex2.rs:30:17
[INFO] [stderr]    |
[INFO] [stderr] 30 |                 return (acc.0 + doubles, acc.1 + triplets);
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(acc.0 + doubles, acc.1 + triplets)`
[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/ex2.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     return ids;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `ids`
[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/ex2.rs:78:5
[INFO] [stderr]    |
[INFO] [stderr] 78 |     return find_base_id(new_ids);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `find_base_id(new_ids)`
[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/ex2.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     return calculate_checksum(ids);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `calculate_checksum(ids)`
[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/ex2.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     return find_base_id(ids);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `find_base_id(ids)`
[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/ex3.rs:57:5
[INFO] [stderr]    |
[INFO] [stderr] 57 |     return fabric;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^ help: remove `return` as shown: `fabric`
[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/ex3.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 | /     return match claims.pop() {
[INFO] [stderr] 65 | |         Some(claim) => get_covered_fabric_for_claims(claims, get_covered_fabric(claim, fabric)),
[INFO] [stderr] 66 | |         None => fabric,
[INFO] [stderr] 67 | |     };
[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] 64 |     match claims.pop() {
[INFO] [stderr] 65 |         Some(claim) => get_covered_fabric_for_claims(claims, get_covered_fabric(claim, fabric)),
[INFO] [stderr] 66 |         None => fabric,
[INFO] [stderr] 67 |     }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/ex3.rs:78:5
[INFO] [stderr]    |
[INFO] [stderr] 78 |     return count;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `count`
[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/ex3.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     return find_fabric_for_claims(claims);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `find_fabric_for_claims(claims)`
[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: long literal lacking separators
[INFO] [stderr]   --> src/ex3.rs:99:20
[INFO] [stderr]    |
[INFO] [stderr] 99 |         assert_eq!(107043, solve_exercise_1())
[INFO] [stderr]    |                    ^^^^^^ help: consider: `107_043`
[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: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]   --> src/ex1.rs:43:13
[INFO] [stderr]    |
[INFO] [stderr] 43 | /             if found_frequencies.contains_key(&current_frequency) {
[INFO] [stderr] 44 | |                 return current_frequency;
[INFO] [stderr] 45 | |             } else {
[INFO] [stderr] 46 | |                 found_frequencies.insert(current_frequency, true);
[INFO] [stderr] 47 | |             };
[INFO] [stderr]    | |_____________^ help: consider using: `found_frequencies.entry(current_frequency)`
[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: this loop could be written as a `for` loop
[INFO] [stderr]   --> src/ex2.rs:41:34
[INFO] [stderr]    |
[INFO] [stderr] 41 |     while let Some(first_char) = first.next() {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^ help: try: `for first_char in first { .. }`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::while_let_on_iterator)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_on_iterator
[INFO] [stderr] 
[INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
[INFO] [stderr]   --> src/ex3.rs:16:1
[INFO] [stderr]    |
[INFO] [stderr] 16 | / fn parse_claim<'a>(claim: &'a str) -> Claim<'a> {
[INFO] [stderr] 17 | |     let mut split_str = claim.split_whitespace();
[INFO] [stderr] 18 | |
[INFO] [stderr] 19 | |     let (_, id) = split_str.next().unwrap().split_at(1);
[INFO] [stderr] ...  |
[INFO] [stderr] 42 | |     }
[INFO] [stderr] 43 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_lifetimes)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]   --> src/ex3.rs:30:16
[INFO] [stderr]    |
[INFO] [stderr] 30 |         .split(",");
[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: single-character string constant used as pattern
[INFO] [stderr]   --> src/ex3.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 27 |         .split(":")
[INFO] [stderr]    |                ^^^ help: try using a char instead: `':'`
[INFO] [stderr]    |
[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: single-character string constant used as pattern
[INFO] [stderr]   --> src/ex3.rs:34:52
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let mut size = split_str.next().unwrap().split("x");
[INFO] [stderr]    |                                                    ^^^ help: try using a char instead: `'x'`
[INFO] [stderr]    |
[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 0.85s
[INFO] running `"docker" "inspect" "3a8a498dabb35117e437e58274c57e3d0b3d5587d1e8f62a80b611b6d0f22299"`
[INFO] running `"docker" "rm" "-f" "3a8a498dabb35117e437e58274c57e3d0b3d5587d1e8f62a80b611b6d0f22299"`
[INFO] [stdout] 3a8a498dabb35117e437e58274c57e3d0b3d5587d1e8f62a80b611b6d0f22299