warning: you should consider adding a `Default` implementation for `LR0ItemSet<'grammar>`
   --> src/lr0/core.rs:111:5
    |
111 | /     pub fn new() -> Self {
112 | |         Self {
113 | |             items: HashSet::new(),
114 | |         }
115 | |     }
    | |_____^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
    = note: `#[warn(clippy::new_without_default)]` on by default
help: try adding this
    |
110 + impl<'grammar> Default for LR0ItemSet<'grammar> {
111 +     fn default() -> Self {
112 +         Self::new()
113 +     }
114 + }
    |

warning: this lifetime isn't used in the function definition
  --> src/lr0/core.rs:44:23
   |
44 |     pub fn transition<'a>(&self, from: usize, via: &Term) -> Option<usize> {
   |                       ^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
   = note: `#[warn(clippy::extra_unused_lifetimes)]` on by default

warning: struct `LR0Closure` has a public `len` method, but no `is_empty` method
  --> src/lr0/core.rs:40:5
   |
40 |     pub fn len(&self) -> usize {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
   = note: `#[warn(clippy::len_without_is_empty)]` on by default

warning: associated items `new`, `get_index_of`, and `get` are never used
  --> src/slr/helper.rs:15:12
   |
14 | impl<'grammar> IndexedGrammar<'grammar> {
   | --------------------------------------- associated items in this implementation
15 |     pub fn new(grammar: &'grammar Grammar) -> IndexedGrammar<'grammar> {
   |            ^^^
...
34 |     pub fn get_index_of(&self, expr: &Expression) -> Option<usize> {
   |            ^^^^^^^^^^^^
...
38 |     pub(crate) fn get(&self, expr: &Expression) -> Option<Production> {
   |                   ^^^

warning: associated items `new`, `shift`, `reduce`, `goto`, and `build` are never used
   --> src/slr/builder.rs:63:12
    |
62  | impl<'grammar> SLRTableBuilder<'grammar> {
    | ---------------------------------------- associated items in this implementation
63  |     pub fn new(
    |            ^^^
...
83  |     fn shift(&self, from: usize, via: &'grammar Term) {
    |        ^^^^^
...
93  |     fn reduce(&self, index: usize, lr0: &LR0Item) {
    |        ^^^^^^
...
103 |     fn goto(&self, from: usize, via: &'grammar Term) {
    |        ^^^^
...
114 |     pub fn build(self) -> SLRTable<'grammar> {
    |            ^^^^^

warning: struct `SLRTableBuilder` is never constructed
  --> src/slr/builder.rs:55:12
   |
55 | pub struct SLRTableBuilder<'grammar> {
   |            ^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default