error: fields `voice_buffer` and `active_voice_count` are never read
  --> plugin/examples/polysynth/src/poly_oscillator.rs:10:5
   |
9  | pub struct PolyOscillator {
   |            -------------- fields in this struct
10 |     voice_buffer: Box<[Voice]>,
   |     ^^^^^^^^^^^^
11 |     active_voice_count: usize,
   |     ^^^^^^^^^^^^^^^^^^

error: field `oscillator` is never read
 --> plugin/examples/polysynth/src/poly_oscillator.rs:6:5
  |
5 | struct Voice {
  |        ----- field in this struct
6 |     oscillator: SquareOscillator,
  |     ^^^^^^^^^^
  |
  = note: `Voice` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis

error: methods `reset`, `set_frequency`, and `next_sample` are never used
  --> plugin/examples/polysynth/src/oscillator.rs:17:12
   |
8  | impl SquareOscillator {
   | --------------------- methods in this implementation
...
17 |     pub fn reset(&mut self) {
   |            ^^^^^
...
22 |     pub fn set_frequency(&mut self, _new_frequency: f32) {
   |            ^^^^^^^^^^^^^
...
27 |     pub fn next_sample(&mut self) -> f32 {
   |            ^^^^^^^^^^^

error: field `frequency_to_phase_increment_ratio` is never read
 --> plugin/examples/polysynth/src/oscillator.rs:5:5
  |
4 | pub struct SquareOscillator {
  |            ---------------- field in this struct
5 |     frequency_to_phase_increment_ratio: f32,
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `SquareOscillator` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
  = note: `-D dead-code` implied by `-D warnings`
  = help: to override `-D warnings` add `#[allow(dead_code)]`

error: unused variable: `output_buffer`
  --> plugin/examples/polysynth/src/poly_oscillator.rs:32:45
   |
32 |     pub fn generate_next_samples(&mut self, output_buffer: &mut [f32]) {
   |                                             ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_output_buffer`

error: unused variable: `event`
  --> plugin/examples/polysynth/src/poly_oscillator.rs:28:37
   |
28 |     pub fn process_event(&mut self, event: &UnknownEvent) {
   |                                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
   |
   = note: `-D unused-variables` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(unused_variables)]`