servo: Merge #10751 - Report lines starting with && in tidy (from zwn:tidy-start-operator); r=Wafflespeanut

Partial implementation of the issue #10692 (the easy part).

Source-Repo: https://github.com/servo/servo
Source-Revision: d926b5d3762a101d5280266f806f2b979f73b695

servo/python/tidy/servo_tidy_tests/rust_tidy.rs

@@ -32,6 +32,9 @@ impl test {
     }
 
     fn test_fun2(y : &String, z : &Vec<f32>) -> f32 {
-        1
+        let x = true;
+        x
+            && x;
     }
+
 }

servo/python/tidy/servo_tidy_tests/test_tidy.py

@@ -70,6 +70,7 @@ class CheckTidiness(unittest.TestCase):
         self.assertEqual('extra space before :', errors.next()[2])
         self.assertEqual('use &[T] instead of &Vec<T>', errors.next()[2])
         self.assertEqual('use &str instead of &String', errors.next()[2])
+        self.assertEqual('operators should go at the end of the first line', errors.next()[2])
         self.assertNoMoreErrors(errors)
 
     def test_spec_link(self):