Fix failure when linting getters (issue 27545)

test/rules/parameter_assignments.dart

Index: test/rules/parameter_assignments.dart
diff --git a/test/rules/parameter_assignments.dart b/test/rules/parameter_assignments.dart
index c830990ffeb2fe78f7c526f2b689ab0f836c9673..4a95dfbd741c1a001fd5b0506e2fc0096838ae8f 100644
--- a/test/rules/parameter_assignments.dart
+++ b/test/rules/parameter_assignments.dart
@@ -13,7 +13,13 @@ void ok(String parameter) {
 }
 
 class A {
-    void badFunction(int parameter) { // LINT
+  int get x => 0;
+
+  set x(int value) { // LINT
+    value = 5;
+  }
+
+  void badFunction(int parameter) { // LINT
     parameter = 4;
   }