warning: casting to the same type is unnecessary (`usize` -> `usize`)
   --> src/trial/history.rs:197:37
    |
197 |             self.max_misalignment + col as usize
    |                                     ^^^^^^^^^^^^ help: try: `col`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
    = note: `#[warn(clippy::unnecessary_cast)]` on by default

warning: this `impl` can be derived
  --> src/config.rs:37:1
   |
37 | / impl Default for Theme {
38 | |     fn default() -> Self {
39 | |         Self {}
40 | |     }
41 | | }
   | |_^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#derivable_impls
   = note: `#[warn(clippy::derivable_impls)]` on by default
   = help: remove the manual implementation...
help: ...and instead derive it
   |
35 + #[derive(Default)]
36 | pub struct Theme {}
   |

warning: function `first_grapheme_cluster` is never used
   --> src/trial/history.rs:241:4
    |
241 | fn first_grapheme_cluster(string: &str) -> &str {
    |    ^^^^^^^^^^^^^^^^^^^^^^

warning: struct `EntryIndices` is never constructed
   --> src/trial/history.rs:235:8
    |
235 | struct EntryIndices {
    |        ^^^^^^^^^^^^

warning: multiple associated items are never used
   --> src/trial/history.rs:39:12
    |
37  | impl History {
    | ------------ associated items in this implementation
38  |     /// Creates a new history, with empty typed and reference strings.
39  |     pub fn new(max_misalignment: usize) -> Self {
    |            ^^^
...
56  |     pub fn push_reference(&mut self, reference: &str) {
    |            ^^^^^^^^^^^^^^
...
104 |     fn push_typed(&mut self, typed: &str) {
    |        ^^^^^^^^^^
...
163 |     const MATCH_COST: u32 = 0;
    |           ^^^^^^^^^^
...
167 |     const MISMATCH_COST: u32 = 2;
    |           ^^^^^^^^^^^^^
168 |     // An insertion or deletion requires one keystroke.
169 |     const INSERTION_COST: u32 = 1;
    |           ^^^^^^^^^^^^^^
170 |     const DELETION_COST: u32 = 1;
    |           ^^^^^^^^^^^^^
171 |
172 |     fn tracked_entries_per_row(&self) -> usize {
    |        ^^^^^^^^^^^^^^^^^^^^^^^
...
176 |     fn row_indices(&self, row: usize) -> impl Iterator<Item = EntryIndices> {
    |        ^^^^^^^^^^^
...
191 |     fn col_indices(&self, col: usize) -> impl Iterator<Item = EntryIndices> {
    |        ^^^^^^^^^^^
...
219 |     fn replacement_cost(&self, row: isize, col: isize) -> Option<u32> {
    |        ^^^^^^^^^^^^^^^^

warning: associated items `new` and `process` are never used
  --> src/trial/mod.rs:27:12
   |
25 | impl Trial {
   | ---------- associated items in this implementation
26 |     /// Create a new trial.
27 |     pub fn new(env: &crate::Env) -> Self {
   |            ^^^
...
35 |     pub fn process(&mut self, input: Input) {
   |            ^^^^^^^

warning: enum `Input` is never used
  --> src/trial/mod.rs:16:10
   |
16 | pub enum Input {
   |          ^^^^^

warning: struct `Trial` is never constructed
 --> src/trial/mod.rs:6:12
  |
6 | pub struct Trial {
  |            ^^^^^

warning: function `deserialize_color` is never used
   --> src/config.rs:110:4
    |
110 | fn deserialize_color<'de, D>(deserializer: D) -> Result<Color, D::Error>
    |    ^^^^^^^^^^^^^^^^^

warning: function `deserialize_style` is never used
  --> src/config.rs:43:4
   |
43 | fn deserialize_style<'de, D>(deserializer: D) -> Result<Style, D::Error>
   |    ^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default