[INFO] updating cached repository terakun/syntactic_monoid
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/terakun/syntactic_monoid
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/terakun/syntactic_monoid" "work/ex/clippy-test-run/sources/stable/gh/terakun/syntactic_monoid"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/terakun/syntactic_monoid'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/terakun/syntactic_monoid" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/terakun/syntactic_monoid"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/terakun/syntactic_monoid'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 74a94df4aa27f5aa2492693dbd167f596e147fe0
[INFO] sha for GitHub repo terakun/syntactic_monoid: 74a94df4aa27f5aa2492693dbd167f596e147fe0
[INFO] validating manifest of terakun/syntactic_monoid 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 terakun/syntactic_monoid 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 terakun/syntactic_monoid
[INFO] finished frobbing terakun/syntactic_monoid
[INFO] frobbed toml for terakun/syntactic_monoid written to work/ex/clippy-test-run/sources/stable/gh/terakun/syntactic_monoid/Cargo.toml
[INFO] started frobbing terakun/syntactic_monoid
[INFO] finished frobbing terakun/syntactic_monoid
[INFO] frobbed toml for terakun/syntactic_monoid written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/terakun/syntactic_monoid/Cargo.toml
[INFO] crate terakun/syntactic_monoid 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 terakun/syntactic_monoid 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-0/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/terakun/syntactic_monoid:/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] e8f2f55626f04daf1418033a19eaf5eea7fc21c117aba1711a18a3e7a2a1e588
[INFO] running `"docker" "start" "-a" "e8f2f55626f04daf1418033a19eaf5eea7fc21c117aba1711a18a3e7a2a1e588"`
[INFO] [stderr]     Checking bit-vec v0.4.4
[INFO] [stderr]     Checking bit-set v0.4.0
[INFO] [stderr]     Checking syntactic_monoid v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/nfa.rs:21:13
[INFO] [stderr]    |
[INFO] [stderr] 21 |             id: id,
[INFO] [stderr]    |             ^^^^^^ help: replace it with: `id`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/nfa.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |             accept: accept,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^ help: replace it with: `accept`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/nfa.rs:41:13
[INFO] [stderr]    |
[INFO] [stderr] 41 |             println!("");
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/dfa.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |             id: id,
[INFO] [stderr]    |             ^^^^^^ help: replace it with: `id`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/dfa.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |             accept: accept,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^ help: replace it with: `accept`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/dfa.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |         println!("");
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/dfa.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |         println!("");
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/syntactic_monoid.rs:29:18
[INFO] [stderr]    |
[INFO] [stderr] 29 |         Matrix { mat: mat, n: size }
[INFO] [stderr]    |                  ^^^^^^^^ help: replace it with: `mat`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/syntactic_monoid.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |             mat: mat,
[INFO] [stderr]    |             ^^^^^^^^ help: replace it with: `mat`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/nfa.rs:21:13
[INFO] [stderr]    |
[INFO] [stderr] 21 |             id: id,
[INFO] [stderr]    |             ^^^^^^ help: replace it with: `id`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/nfa.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |             accept: accept,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^ help: replace it with: `accept`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/nfa.rs:41:13
[INFO] [stderr]    |
[INFO] [stderr] 41 |             println!("");
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/dfa.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |             id: id,
[INFO] [stderr]    |             ^^^^^^ help: replace it with: `id`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/dfa.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |             accept: accept,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^ help: replace it with: `accept`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/dfa.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |         println!("");
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/dfa.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |         println!("");
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/syntactic_monoid.rs:29:18
[INFO] [stderr]    |
[INFO] [stderr] 29 |         Matrix { mat: mat, n: size }
[INFO] [stderr]    |                  ^^^^^^^^ help: replace it with: `mat`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/syntactic_monoid.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |             mat: mat,
[INFO] [stderr]    |             ^^^^^^^^ help: replace it with: `mat`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `regex::RegularExpression`
[INFO] [stderr]  --> src/syntactic_monoid.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use regex::RegularExpression;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `regex::RegularExpression`
[INFO] [stderr]  --> src/syntactic_monoid.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use regex::RegularExpression;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/regex.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     Empty,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Epsilon`
[INFO] [stderr]  --> src/regex.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     Epsilon,
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/nfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_graphviz`
[INFO] [stderr]    --> src/nfa.rs:253:5
[INFO] [stderr]     |
[INFO] [stderr] 253 |     pub fn to_graphviz(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_trans`
[INFO] [stderr]   --> src/dfa.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_trans`
[INFO] [stderr]   --> src/dfa.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub fn add_trans(&mut self, id: i32, ch: usize) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/dfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_subset`
[INFO] [stderr]   --> src/dfa.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn print_subset(subset: &SubSet) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `accept`
[INFO] [stderr]    --> src/dfa.rs:227:5
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `alphabets`
[INFO] [stderr]   --> src/syntactic_monoid.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     alphabets: BitSet,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/regex.rs:53:35
[INFO] [stderr]    |
[INFO] [stderr] 53 |     pub fn parse(&mut self, text: &String) -> Option<RegularExpression> {
[INFO] [stderr]    |                                   ^^^^^^^ help: change this to: `&str`
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/regex.rs:63:13
[INFO] [stderr]    |
[INFO] [stderr] 63 |             self.cur = self.cur + 1;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/regex.rs:98:21
[INFO] [stderr]    |
[INFO] [stderr] 98 |                     self.cur = self.cur + 1;
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: manual implementation of an assign operation
[INFO] [stderr]    --> src/regex.rs:111:17
[INFO] [stderr]     |
[INFO] [stderr] 111 |                 self.cur = self.cur + 1;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/regex.rs:112:27
[INFO] [stderr]     |
[INFO] [stderr] 112 |                   let exp = match &self.read_union() {
[INFO] [stderr]     |  ___________________________^
[INFO] [stderr] 113 | |                     &Some(ref exp) => exp.clone(),
[INFO] [stderr] 114 | |                     &None => {
[INFO] [stderr] 115 | |                         return None;
[INFO] [stderr] 116 | |                     }
[INFO] [stderr] 117 | |                 };
[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: try
[INFO] [stderr]     |
[INFO] [stderr] 112 |                 let exp = match self.read_union() {
[INFO] [stderr] 113 |                     Some(ref exp) => exp.clone(),
[INFO] [stderr] 114 |                     None => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/regex.rs:122:17
[INFO] [stderr]     |
[INFO] [stderr] 122 |                 self.cur = self.cur + 1;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: manual implementation of an assign operation
[INFO] [stderr]    --> src/regex.rs:128:17
[INFO] [stderr]     |
[INFO] [stderr] 128 |                 self.cur = self.cur + 1;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/regex.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     Empty,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/dfa.rs:23:45
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stderr]    |                                             ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] help: change this to
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &[i32]) {
[INFO] [stderr]    |                                             ^^^^^^
[INFO] [stderr] help: change `transition.clone()` to
[INFO] [stderr]    |
[INFO] [stderr] 24 |         self.t = transition.to_owned();
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/dfa.rs:38:13
[INFO] [stderr]    |
[INFO] [stderr] 38 |             i = i + 1;
[INFO] [stderr]    |             ^^^^^^^^^ help: replace it with: `i += 1`
[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] 
[INFO] [stderr] warning: variant is never constructed: `Epsilon`
[INFO] [stderr]  --> src/regex.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     Epsilon,
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/nfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_graphviz`
[INFO] [stderr]    --> src/nfa.rs:253:5
[INFO] [stderr]     |
[INFO] [stderr] 253 |     pub fn to_graphviz(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_trans`
[INFO] [stderr]   --> src/dfa.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_trans`
[INFO] [stderr]   --> src/dfa.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub fn add_trans(&mut self, id: i32, ch: usize) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/dfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_subset`
[INFO] [stderr]   --> src/dfa.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn print_subset(subset: &SubSet) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `accept`
[INFO] [stderr]    --> src/dfa.rs:227:5
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `alphabets`
[INFO] [stderr]   --> src/syntactic_monoid.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     alphabets: BitSet,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/regex.rs:53:35
[INFO] [stderr]    |
[INFO] [stderr] 53 |     pub fn parse(&mut self, text: &String) -> Option<RegularExpression> {
[INFO] [stderr]    |                                   ^^^^^^^ help: change this to: `&str`
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/regex.rs:63:13
[INFO] [stderr]    |
[INFO] [stderr] 63 |             self.cur = self.cur + 1;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[INFO] [stderr]    |
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/dfa.rs:126:45
[INFO] [stderr]     |
[INFO] [stderr] 126 |                 dfa_state.t[ch as usize] = *nfa2dfa_id.get(&trans_subset).unwrap() as i32;
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&nfa2dfa_id[&trans_subset]`
[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]    = 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: manual implementation of an assign operation
[INFO] [stderr]   --> src/regex.rs:98:21
[INFO] [stderr]    |
[INFO] [stderr] 98 |                     self.cur = self.cur + 1;
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: manual implementation of an assign operation
[INFO] [stderr]    --> src/regex.rs:111:17
[INFO] [stderr]     |
[INFO] [stderr] 111 |                 self.cur = self.cur + 1;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/regex.rs:112:27
[INFO] [stderr]     |
[INFO] [stderr] 112 |                   let exp = match &self.read_union() {
[INFO] [stderr]     |  ___________________________^
[INFO] [stderr] 113 | |                     &Some(ref exp) => exp.clone(),
[INFO] [stderr] 114 | |                     &None => {
[INFO] [stderr] 115 | |                         return None;
[INFO] [stderr] 116 | |                     }
[INFO] [stderr] 117 | |                 };
[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: try
[INFO] [stderr]     |
[INFO] [stderr] 112 |                 let exp = match self.read_union() {
[INFO] [stderr] 113 |                     Some(ref exp) => exp.clone(),
[INFO] [stderr] 114 |                     None => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/regex.rs:122:17
[INFO] [stderr]     |
[INFO] [stderr] 122 |                 self.cur = self.cur + 1;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: manual implementation of an assign operation
[INFO] [stderr]    --> src/regex.rs:128:17
[INFO] [stderr]     |
[INFO] [stderr] 128 |                 self.cur = self.cur + 1;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.cur += 1`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/dfa.rs:227:33
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stderr]     |                                 ^^^^^^^^ help: change this to: `&[u8]`
[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: the loop variable `i` is used to index `mat`
[INFO] [stderr]   --> src/syntactic_monoid.rs:26:18
[INFO] [stderr]    |
[INFO] [stderr] 26 |         for i in 0..size {
[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] 26 |         for (i, <item>) in mat.iter_mut().enumerate().take(size) {
[INFO] [stderr]    |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is used to index `mat`
[INFO] [stderr]   --> src/syntactic_monoid.rs:49:18
[INFO] [stderr]    |
[INFO] [stderr] 49 |         for i in 0..self.n {
[INFO] [stderr]    |                  ^^^^^^^^^
[INFO] [stderr]    |
[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] 49 |         for (i, <item>) in mat.iter_mut().enumerate().take(self.n) {
[INFO] [stderr]    |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/syntactic_monoid.rs:52:21
[INFO] [stderr]    |
[INFO] [stderr] 52 |                     mat[i][j] = mat[i][j] + self.mat[i][k] * m.mat[k][j];
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `mat[i][j] += self.mat[i][k] * m.mat[k][j]`
[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: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/syntactic_monoid.rs:66:20
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn identity(e: &ElemType) -> bool {
[INFO] [stderr]    |                    ^^^^^^^^^ help: consider passing by value instead: `ElemType`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/syntactic_monoid.rs:110:10
[INFO] [stderr]     |
[INFO] [stderr] 110 |         *self.transitions_map.get(&mat).unwrap()
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.transitions_map[&mat]`
[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: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/syntactic_monoid.rs:158:29
[INFO] [stderr]     |
[INFO] [stderr] 158 |     pub fn accept(&self, e: &ElemType) -> bool {
[INFO] [stderr]     |                             ^^^^^^^^^ help: consider passing by value instead: `ElemType`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/syntactic_monoid.rs:162:51
[INFO] [stderr]     |
[INFO] [stderr] 162 |     pub fn construct(&mut self, dfa: &DFA, input: &String) {
[INFO] [stderr]     |                                                   ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 162 |     pub fn construct(&mut self, dfa: &DFA, input: &str) {
[INFO] [stderr]     |                                                   ^^^^
[INFO] [stderr] help: change `input.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 164 |         self.input = input.to_string();
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/syntactic_monoid.rs:188:43
[INFO] [stderr]     |
[INFO] [stderr] 188 |                         .insert(c as u8, *self.transitions_map.get(&next).unwrap());
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.transitions_map[&next]`
[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: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/syntactic_monoid.rs:215:22
[INFO] [stderr]     |
[INFO] [stderr] 215 |                     *self.transitions_map.get(&mult_matij).unwrap();
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.transitions_map[&mult_matij]`
[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: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/syntactic_monoid.rs:218:22
[INFO] [stderr]     |
[INFO] [stderr] 218 |                     *self.transitions_map.get(&mult_matji).unwrap();
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.transitions_map[&mult_matji]`
[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: the function has a cyclomatic complexity of 38
[INFO] [stderr]    --> src/syntactic_monoid.rs:237:5
[INFO] [stderr]     |
[INFO] [stderr] 237 | /     fn starfree_recursion(&self, m: ElemType, memo: &mut HashMap<ElemType, String>) -> String {
[INFO] [stderr] 238 | |         if let Some(ref s) = memo.get(&m) {
[INFO] [stderr] 239 | |             return s.to_string();
[INFO] [stderr] 240 | |         }
[INFO] [stderr] ...   |
[INFO] [stderr] 391 | |         regex
[INFO] [stderr] 392 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cyclomatic_complexity)] on by default
[INFO] [stderr]     = help: you could split it up into multiple smaller functions
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[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/dfa.rs:23:45
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stderr]    |                                             ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] help: change this to
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &[i32]) {
[INFO] [stderr]    |                                             ^^^^^^
[INFO] [stderr] help: change `transition.clone()` to
[INFO] [stderr]    |
[INFO] [stderr] 24 |         self.t = transition.to_owned();
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/dfa.rs:38:13
[INFO] [stderr]    |
[INFO] [stderr] 38 |             i = i + 1;
[INFO] [stderr]    |             ^^^^^^^^^ help: replace it with: `i += 1`
[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: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/dfa.rs:126:45
[INFO] [stderr]     |
[INFO] [stderr] 126 |                 dfa_state.t[ch as usize] = *nfa2dfa_id.get(&trans_subset).unwrap() as i32;
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&nfa2dfa_id[&trans_subset]`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/dfa.rs:227:33
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stderr]     |                                 ^^^^^^^^ help: change this to: `&[u8]`
[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: the loop variable `i` is used to index `mat`
[INFO] [stderr]   --> src/syntactic_monoid.rs:26:18
[INFO] [stderr]    |
[INFO] [stderr] 26 |         for i in 0..size {
[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] 26 |         for (i, <item>) in mat.iter_mut().enumerate().take(size) {
[INFO] [stderr]    |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is used to index `mat`
[INFO] [stderr]   --> src/syntactic_monoid.rs:49:18
[INFO] [stderr]    |
[INFO] [stderr] 49 |         for i in 0..self.n {
[INFO] [stderr]    |                  ^^^^^^^^^
[INFO] [stderr]    |
[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] 49 |         for (i, <item>) in mat.iter_mut().enumerate().take(self.n) {
[INFO] [stderr]    |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/syntactic_monoid.rs:52:21
[INFO] [stderr]    |
[INFO] [stderr] 52 |                     mat[i][j] = mat[i][j] + self.mat[i][k] * m.mat[k][j];
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `mat[i][j] += self.mat[i][k] * m.mat[k][j]`
[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: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/syntactic_monoid.rs:66:20
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn identity(e: &ElemType) -> bool {
[INFO] [stderr]    |                    ^^^^^^^^^ help: consider passing by value instead: `ElemType`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/syntactic_monoid.rs:110:10
[INFO] [stderr]     |
[INFO] [stderr] 110 |         *self.transitions_map.get(&mat).unwrap()
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.transitions_map[&mat]`
[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: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/syntactic_monoid.rs:158:29
[INFO] [stderr]     |
[INFO] [stderr] 158 |     pub fn accept(&self, e: &ElemType) -> bool {
[INFO] [stderr]     |                             ^^^^^^^^^ help: consider passing by value instead: `ElemType`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/syntactic_monoid.rs:162:51
[INFO] [stderr]     |
[INFO] [stderr] 162 |     pub fn construct(&mut self, dfa: &DFA, input: &String) {
[INFO] [stderr]     |                                                   ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 162 |     pub fn construct(&mut self, dfa: &DFA, input: &str) {
[INFO] [stderr]     |                                                   ^^^^
[INFO] [stderr] help: change `input.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 164 |         self.input = input.to_string();
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/syntactic_monoid.rs:188:43
[INFO] [stderr]     |
[INFO] [stderr] 188 |                         .insert(c as u8, *self.transitions_map.get(&next).unwrap());
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.transitions_map[&next]`
[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: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/syntactic_monoid.rs:215:22
[INFO] [stderr]     |
[INFO] [stderr] 215 |                     *self.transitions_map.get(&mult_matij).unwrap();
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.transitions_map[&mult_matij]`
[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: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/syntactic_monoid.rs:218:22
[INFO] [stderr]     |
[INFO] [stderr] 218 |                     *self.transitions_map.get(&mult_matji).unwrap();
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.transitions_map[&mult_matji]`
[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: the function has a cyclomatic complexity of 38
[INFO] [stderr]    --> src/syntactic_monoid.rs:237:5
[INFO] [stderr]     |
[INFO] [stderr] 237 | /     fn starfree_recursion(&self, m: ElemType, memo: &mut HashMap<ElemType, String>) -> String {
[INFO] [stderr] 238 | |         if let Some(ref s) = memo.get(&m) {
[INFO] [stderr] 239 | |             return s.to_string();
[INFO] [stderr] 240 | |         }
[INFO] [stderr] ...   |
[INFO] [stderr] 391 | |         regex
[INFO] [stderr] 392 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cyclomatic_complexity)] on by default
[INFO] [stderr]     = help: you could split it up into multiple smaller functions
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.88s
[INFO] running `"docker" "inspect" "e8f2f55626f04daf1418033a19eaf5eea7fc21c117aba1711a18a3e7a2a1e588"`
[INFO] running `"docker" "rm" "-f" "e8f2f55626f04daf1418033a19eaf5eea7fc21c117aba1711a18a3e7a2a1e588"`
[INFO] [stdout] e8f2f55626f04daf1418033a19eaf5eea7fc21c117aba1711a18a3e7a2a1e588