Some small clippy cleanups.

src/bin/allergens.rs

@@ -73,7 +73,7 @@ fn main() -> Result<(), TopLevelError> {
     for (key, mut val) in mapping.drain() {
         final_allergens.push((key, val.drain().next().unwrap()));
     }
-    final_allergens.sort_by(|(k1, v1), (k2, v2)| k1.cmp(k2));
+    final_allergens.sort_by(|(k1, _), (k2, _)| k1.cmp(k2));
     let foods: Vec<&str> = final_allergens.iter().map(|(_, v)| *v).collect();
     let mut result = String::new();
 

src/bin/satellite.rs

@@ -124,6 +124,7 @@ impl Tile {
         self.raw_data[(y * self.edge_length) + x] = v;
     }
 
+    #[cfg(test)]
     fn draw(&self) {
         println!("Tile {} [{:?}]:", self.identity, self.history);
         for y in 0..self.edge_length {
@@ -463,7 +464,7 @@ impl Board {
                     .map(|x| x[0].identity)
                     .collect();
                 let orig_length = idents.len();
-                idents.sort();
+                idents.sort_unstable();
                 idents.dedup();
                 if idents.len() == orig_length {
                     return Ok(possible_board);
@@ -729,7 +730,7 @@ fn main() -> Result<(), TopLevelError> {
         tl * tr * bl * br
     );
     println!();
-    let mut base_image = Image::from(final_value);
+    let base_image = Image::from(final_value);
     base_image.draw();
     println!("---------------------");
     let sea_monster = Image::sea_monster();