[INFO] updating cached repository bastikr/wordacademy-solver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bastikr/wordacademy-solver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bastikr/wordacademy-solver" "work/ex/clippy-test-run/sources/stable/gh/bastikr/wordacademy-solver"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/bastikr/wordacademy-solver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bastikr/wordacademy-solver" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/bastikr/wordacademy-solver"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/bastikr/wordacademy-solver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a1f58d948ca4a6bf2ca14f6b00847a632d98e77f
[INFO] sha for GitHub repo bastikr/wordacademy-solver: a1f58d948ca4a6bf2ca14f6b00847a632d98e77f
[INFO] validating manifest of bastikr/wordacademy-solver 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 bastikr/wordacademy-solver 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 bastikr/wordacademy-solver
[INFO] finished frobbing bastikr/wordacademy-solver
[INFO] frobbed toml for bastikr/wordacademy-solver written to work/ex/clippy-test-run/sources/stable/gh/bastikr/wordacademy-solver/Cargo.toml
[INFO] started frobbing bastikr/wordacademy-solver
[INFO] finished frobbing bastikr/wordacademy-solver
[INFO] frobbed toml for bastikr/wordacademy-solver written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/bastikr/wordacademy-solver/Cargo.toml
[INFO] crate bastikr/wordacademy-solver 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 bastikr/wordacademy-solver against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-6/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/bastikr/wordacademy-solver:/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] 1716d7d8026e2db60690c64c2b85b0fbfeaf0f32c36c6c62a874d64c6b3c4f71
[INFO] running `"docker" "start" "-a" "1716d7d8026e2db60690c64c2b85b0fbfeaf0f32c36c6c62a874d64c6b3c4f71"`
[INFO] [stderr]     Checking wordacademy-solver v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/board.rs:93:32
[INFO] [stderr]    |
[INFO] [stderr] 93 |         Neighbours { count: 0, size: size, i0: i, j0: j}
[INFO] [stderr]    |                                ^^^^^^^^^^ help: replace it with: `size`
[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/board.rs:93:32
[INFO] [stderr]    |
[INFO] [stderr] 93 |         Neighbours { count: 0, size: size, i0: i, j0: j}
[INFO] [stderr]    |                                ^^^^^^^^^^ help: replace it with: `size`
[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: unneeded return statement
[INFO] [stderr]    --> src/board.rs:116:17
[INFO] [stderr]     |
[INFO] [stderr] 116 |                 return Some((self.i0-1, self.j0-1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0-1, self.j0-1))`
[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/board.rs:128:17
[INFO] [stderr]     |
[INFO] [stderr] 128 |                 return Some((self.i0-1, self.j0));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0-1, self.j0))`
[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/board.rs:132:17
[INFO] [stderr]     |
[INFO] [stderr] 132 |                 return Some((self.i0-1, self.j0+1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0-1, self.j0+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/board.rs:144:17
[INFO] [stderr]     |
[INFO] [stderr] 144 |                 return Some((self.i0, self.j0+1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0, self.j0+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/board.rs:148:17
[INFO] [stderr]     |
[INFO] [stderr] 148 |                 return Some((self.i0+1, self.j0+1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0+1, self.j0+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/board.rs:156:17
[INFO] [stderr]     |
[INFO] [stderr] 156 |                 return Some((self.i0+1, self.j0));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0+1, self.j0))`
[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/board.rs:160:17
[INFO] [stderr]     |
[INFO] [stderr] 160 |                 return Some((self.i0+1, self.j0-1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0+1, self.j0-1))`
[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/board.rs:164:17
[INFO] [stderr]     |
[INFO] [stderr] 164 |                 return Some((self.i0, self.j0-1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0, self.j0-1))`
[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/board.rs:167:18
[INFO] [stderr]     |
[INFO] [stderr] 167 |             _ => return None,
[INFO] [stderr]     |                  ^^^^^^^^^^^ help: remove `return` as shown: `None`
[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: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/chargraph.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/solver_positional.rs:569:5
[INFO] [stderr]     |
[INFO] [stderr] 569 |     return true;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `true`
[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/board.rs:116:17
[INFO] [stderr]     |
[INFO] [stderr] 116 |                 return Some((self.i0-1, self.j0-1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0-1, self.j0-1))`
[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/board.rs:128:17
[INFO] [stderr]     |
[INFO] [stderr] 128 |                 return Some((self.i0-1, self.j0));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0-1, self.j0))`
[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/board.rs:132:17
[INFO] [stderr]     |
[INFO] [stderr] 132 |                 return Some((self.i0-1, self.j0+1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0-1, self.j0+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/board.rs:144:17
[INFO] [stderr]     |
[INFO] [stderr] 144 |                 return Some((self.i0, self.j0+1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0, self.j0+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/board.rs:148:17
[INFO] [stderr]     |
[INFO] [stderr] 148 |                 return Some((self.i0+1, self.j0+1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0+1, self.j0+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/board.rs:156:17
[INFO] [stderr]     |
[INFO] [stderr] 156 |                 return Some((self.i0+1, self.j0));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0+1, self.j0))`
[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/board.rs:160:17
[INFO] [stderr]     |
[INFO] [stderr] 160 |                 return Some((self.i0+1, self.j0-1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0+1, self.j0-1))`
[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/board.rs:164:17
[INFO] [stderr]     |
[INFO] [stderr] 164 |                 return Some((self.i0, self.j0-1));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some((self.i0, self.j0-1))`
[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/board.rs:167:18
[INFO] [stderr]     |
[INFO] [stderr] 167 |             _ => return None,
[INFO] [stderr]     |                  ^^^^^^^^^^^ help: remove `return` as shown: `None`
[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: unused import: `Mask`
[INFO] [stderr]    --> src/board.rs:245:29
[INFO] [stderr]     |
[INFO] [stderr] 245 |     use board::{Neighbours, Mask};
[INFO] [stderr]     |                             ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/chargraph.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/solver_positional.rs:569:5
[INFO] [stderr]     |
[INFO] [stderr] 569 |     return true;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `true`
[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: unused variable: `index`
[INFO] [stderr]   --> src/chargraph.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |             Err(index) => { panic!("bla") }
[INFO] [stderr]    |                 ^^^^^ help: consider using `_index` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `writeable`
[INFO] [stderr]    --> src/solver_positional.rs:515:1
[INFO] [stderr]     |
[INFO] [stderr] 515 | fn writeable(word: &str, board: &Board) -> bool {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |         writeln!(f);
[INFO] [stderr]    |         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:68:13
[INFO] [stderr]    |
[INFO] [stderr] 68 |             writeln!(f, "{}", separator);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:70:17
[INFO] [stderr]    |
[INFO] [stderr] 70 |                 write!(f, "|");
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:72:21
[INFO] [stderr]    |
[INFO] [stderr] 72 |                     write!(f, "{}", self.get(i, j));
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:74:21
[INFO] [stderr]    |
[INFO] [stderr] 74 |                     write!(f, " ");
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |             writeln!(f, "|");
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/word.rs:64:13
[INFO] [stderr]    |
[INFO] [stderr] 64 | /             match j_last {
[INFO] [stderr] 65 | |                 Some(value) => {
[INFO] [stderr] 66 | |                     if value+1<j_now || j_now+1<value {
[INFO] [stderr] 67 | |                         return false;
[INFO] [stderr] ...  |
[INFO] [stderr] 70 | |                 None => {}
[INFO] [stderr] 71 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 64 |             if let Some(value) = j_last {
[INFO] [stderr] 65 |     if value+1<j_now || j_now+1<value {
[INFO] [stderr] 66 |         return false;
[INFO] [stderr] 67 |     }
[INFO] [stderr] 68 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/chargraph.rs:59:35
[INFO] [stderr]    |
[INFO] [stderr] 59 |     pub fn contains_key(&self, x: &char) -> bool {
[INFO] [stderr]    |                                   ^^^^^ help: consider passing by value instead: `char`
[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: redundant pattern matching, consider using `is_ok()`
[INFO] [stderr]   --> src/chargraph.rs:60:9
[INFO] [stderr]    |
[INFO] [stderr] 60 | /         match self.chars.binary_search(x) {
[INFO] [stderr] 61 | |             Ok(_) => true,
[INFO] [stderr] 62 | |             Err(_) => false
[INFO] [stderr] 63 | |         }
[INFO] [stderr]    | |_________^ help: try this: `self.chars.binary_search(x).is_ok()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_pattern_matching)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: item `solver_positional::GroupedSolution` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]   --> src/solver_positional.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | / impl GroupedSolution {
[INFO] [stderr] 35 | |     pub fn words(&self) -> Vec<String> {
[INFO] [stderr] 36 | |         let v: &Vec<Word> = self.solutions.iter().next().unwrap();
[INFO] [stderr] 37 | |         v.iter().map(|x| x.as_string()).collect()
[INFO] [stderr] ...  |
[INFO] [stderr] 59 | |     }
[INFO] [stderr] 60 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: the function has a cyclomatic complexity of 103
[INFO] [stderr]    --> src/solver_positional.rs:91:1
[INFO] [stderr]     |
[INFO] [stderr] 91  | / fn walk(i: usize, j: usize, state: &State) -> Option<Vec<Vec<Word>>> {
[INFO] [stderr] 92  | |     let currentchar = state.board.get(i, j);
[INFO] [stderr] 93  | |     if !state.graph.contains_key(&currentchar)
[INFO] [stderr] 94  | |         || !contains_a_length(state.graph, state.lengths)
[INFO] [stderr] ...   |
[INFO] [stderr] 503 | |     Some(solutions)
[INFO] [stderr] 504 | | }
[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: struct update has no effect, all the fields in the struct have already been specified
[INFO] [stderr]    --> src/solver_positional.rs:131:23
[INFO] [stderr]     |
[INFO] [stderr] 131 |                     ..*state
[INFO] [stderr]     |                       ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_update)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_update
[INFO] [stderr] 
[INFO] [stderr] warning: this looks like you are swapping `v0` and `v1` manually
[INFO] [stderr]    --> src/solver_positional.rs:563:9
[INFO] [stderr]     |
[INFO] [stderr] 563 | /         let tmp = v0;
[INFO] [stderr] 564 | |         v0 = v1;
[INFO] [stderr] 565 | |         v1 = tmp;
[INFO] [stderr]     | |________________^ help: try: `std::mem::swap(&mut v0, &mut v1)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::manual_swap)] on by default
[INFO] [stderr]     = note: or maybe you should use `std::mem::replace`?
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]    --> src/solver_positional.rs:575:10
[INFO] [stderr]     |
[INFO] [stderr] 575 |         .into_iter()
[INFO] [stderr]     |          ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `graph`
[INFO] [stderr]   --> src/chargraph.rs:97:13
[INFO] [stderr]    |
[INFO] [stderr] 97 |         let graph = CharGraph::from_strings(&words);
[INFO] [stderr]    |             ^^^^^ help: consider using `_graph` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/chargraph.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |             Err(index) => { panic!("bla") }
[INFO] [stderr]    |                 ^^^^^ help: consider using `_index` instead
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `writeable`
[INFO] [stderr]    --> src/solver_positional.rs:515:1
[INFO] [stderr]     |
[INFO] [stderr] 515 | fn writeable(word: &str, board: &Board) -> bool {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |         writeln!(f);
[INFO] [stderr]    |         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:68:13
[INFO] [stderr]    |
[INFO] [stderr] 68 |             writeln!(f, "{}", separator);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:70:17
[INFO] [stderr]    |
[INFO] [stderr] 70 |                 write!(f, "|");
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:72:21
[INFO] [stderr]    |
[INFO] [stderr] 72 |                     write!(f, "{}", self.get(i, j));
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:74:21
[INFO] [stderr]    |
[INFO] [stderr] 74 |                     write!(f, " ");
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/board.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |             writeln!(f, "|");
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/word.rs:64:13
[INFO] [stderr]    |
[INFO] [stderr] 64 | /             match j_last {
[INFO] [stderr] 65 | |                 Some(value) => {
[INFO] [stderr] 66 | |                     if value+1<j_now || j_now+1<value {
[INFO] [stderr] 67 | |                         return false;
[INFO] [stderr] ...  |
[INFO] [stderr] 70 | |                 None => {}
[INFO] [stderr] 71 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 64 |             if let Some(value) = j_last {
[INFO] [stderr] 65 |     if value+1<j_now || j_now+1<value {
[INFO] [stderr] 66 |         return false;
[INFO] [stderr] 67 |     }
[INFO] [stderr] 68 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/chargraph.rs:59:35
[INFO] [stderr]    |
[INFO] [stderr] 59 |     pub fn contains_key(&self, x: &char) -> bool {
[INFO] [stderr]    |                                   ^^^^^ help: consider passing by value instead: `char`
[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: redundant pattern matching, consider using `is_ok()`
[INFO] [stderr]   --> src/chargraph.rs:60:9
[INFO] [stderr]    |
[INFO] [stderr] 60 | /         match self.chars.binary_search(x) {
[INFO] [stderr] 61 | |             Ok(_) => true,
[INFO] [stderr] 62 | |             Err(_) => false
[INFO] [stderr] 63 | |         }
[INFO] [stderr]    | |_________^ help: try this: `self.chars.binary_search(x).is_ok()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_pattern_matching)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: item `solver_positional::GroupedSolution` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]   --> src/solver_positional.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | / impl GroupedSolution {
[INFO] [stderr] 35 | |     pub fn words(&self) -> Vec<String> {
[INFO] [stderr] 36 | |         let v: &Vec<Word> = self.solutions.iter().next().unwrap();
[INFO] [stderr] 37 | |         v.iter().map(|x| x.as_string()).collect()
[INFO] [stderr] ...  |
[INFO] [stderr] 59 | |     }
[INFO] [stderr] 60 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: the function has a cyclomatic complexity of 103
[INFO] [stderr]    --> src/solver_positional.rs:91:1
[INFO] [stderr]     |
[INFO] [stderr] 91  | / fn walk(i: usize, j: usize, state: &State) -> Option<Vec<Vec<Word>>> {
[INFO] [stderr] 92  | |     let currentchar = state.board.get(i, j);
[INFO] [stderr] 93  | |     if !state.graph.contains_key(&currentchar)
[INFO] [stderr] 94  | |         || !contains_a_length(state.graph, state.lengths)
[INFO] [stderr] ...   |
[INFO] [stderr] 503 | |     Some(solutions)
[INFO] [stderr] 504 | | }
[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: struct update has no effect, all the fields in the struct have already been specified
[INFO] [stderr]    --> src/solver_positional.rs:131:23
[INFO] [stderr]     |
[INFO] [stderr] 131 |                     ..*state
[INFO] [stderr]     |                       ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_update)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_update
[INFO] [stderr] 
[INFO] [stderr] warning: this looks like you are swapping `v0` and `v1` manually
[INFO] [stderr]    --> src/solver_positional.rs:563:9
[INFO] [stderr]     |
[INFO] [stderr] 563 | /         let tmp = v0;
[INFO] [stderr] 564 | |         v0 = v1;
[INFO] [stderr] 565 | |         v1 = tmp;
[INFO] [stderr]     | |________________^ help: try: `std::mem::swap(&mut v0, &mut v1)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::manual_swap)] on by default
[INFO] [stderr]     = note: or maybe you should use `std::mem::replace`?
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]    --> src/solver_positional.rs:575:10
[INFO] [stderr]     |
[INFO] [stderr] 575 |         .into_iter()
[INFO] [stderr]     |          ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.41s
[INFO] running `"docker" "inspect" "1716d7d8026e2db60690c64c2b85b0fbfeaf0f32c36c6c62a874d64c6b3c4f71"`
[INFO] running `"docker" "rm" "-f" "1716d7d8026e2db60690c64c2b85b0fbfeaf0f32c36c6c62a874d64c6b3c4f71"`
[INFO] [stdout] 1716d7d8026e2db60690c64c2b85b0fbfeaf0f32c36c6c62a874d64c6b3c4f71