Clippy fixes and documentation

src/static_data/species_data/form.rs

@@ -56,6 +56,9 @@ pub trait Form: Debug {
 
     /// Arbitrary flags that can be applied to the move.
     fn has_flag_by_hash(&self, key_hash: u32) -> bool;
+
+    /// Check if two forms are equal.
+    fn eq(&self, other: &dyn Form) -> bool;
 }
 
 /// A form is a variant of a specific species. A species always has at least one form, but can have
@@ -217,6 +220,10 @@ impl Form for FormImpl {
     fn has_flag_by_hash(&self, key_hash: u32) -> bool {
         self.flags.contains::<u32>(&key_hash)
     }
+
+    fn eq(&self, other: &dyn Form) -> bool {
+        std::ptr::eq(self, other as *const dyn Form as *const Self)
+    }
 }
 
 #[cfg(test)]
@@ -247,6 +254,7 @@ pub(crate) mod tests {
             fn get_random_hidden_ability<'a>(&'a self, rand: &mut Random) -> Result<&'a StringKey>;
             fn has_flag(&self, key: &StringKey) -> bool;
             fn has_flag_by_hash(&self, key_hash: u32) -> bool;
+            fn eq(&self, other: &dyn Form) -> bool;
         }
     }
 }