fix clippy anger

Author: Mr Martian

rust/mapbox/vector_layer.rs

@@ -132,13 +132,13 @@ pub fn write_layer(layer: &BaseVectorLayer, mapbox_support: bool) -> Vec<u8> {
         pbf.write_bytes_field(2, &write_feature(feature, &mut keys, &mut values, mapbox_support));
     }
     let mut keys: Vec<(String, usize)> = keys.into_iter().collect();
-    keys.sort_by(|a, b| a.1.cmp(&b.1));
+    keys.sort_by_key(|a| a.1);
     // keys and values
     for (key, _) in keys.iter() {
         pbf.write_string_field(3, key);
     }
     let mut values: Vec<(PrimitiveValue, usize)> = values.into_iter().collect();
-    values.sort_by(|a, b| a.1.cmp(&b.1));
+    values.sort_by_key(|a| a.1);
     for (value, _) in values.iter() {
         pbf.write_message(4, value);
     }

rust/open/column_cache.rs

@@ -330,16 +330,16 @@ impl ProtoWrite for ColumnCacheWriter {
         // sort_column(&mut signed);
         // sort_column(&mut float);
         // sort_column(&mut double);
-        strings.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        unsigned.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        signed.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        float.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        double.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        points.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        points_3d.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        indices.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        shapes.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
-        bbox.sort_by(|a, b| a.1.borrow().index.cmp(&b.1.borrow().index));
+        strings.sort_by_key(|a| a.1.borrow().index);
+        unsigned.sort_by_key(|a| a.1.borrow().index);
+        signed.sort_by_key(|a| a.1.borrow().index);
+        float.sort_by_key(|a| a.1.borrow().index);
+        double.sort_by_key(|a| a.1.borrow().index);
+        points.sort_by_key(|a| a.1.borrow().index);
+        points_3d.sort_by_key(|a| a.1.borrow().index);
+        indices.sort_by_key(|a| a.1.borrow().index);
+        shapes.sort_by_key(|a| a.1.borrow().index);
+        bbox.sort_by_key(|a| a.1.borrow().index);
 
         // store
         // strings