Check if the method / accessor being inlined is synthetic.

pkg/analysis_server/test/services/refactoring/inline_method_test.dart

Index: pkg/analysis_server/test/services/refactoring/inline_method_test.dart
diff --git a/pkg/analysis_server/test/services/refactoring/inline_method_test.dart b/pkg/analysis_server/test/services/refactoring/inline_method_test.dart
index 62c12a61d00dcaa8fa6d2f8afb985f6e0cc6fc49..f76f731d42e1b998d6a64776cd934ce8c84e1064 100644
--- a/pkg/analysis_server/test/services/refactoring/inline_method_test.dart
+++ b/pkg/analysis_server/test/services/refactoring/inline_method_test.dart
@@ -161,6 +161,21 @@ class A {
     return _assertConditionsFatal('Cannot inline operator.');
   }
 
+  test_bad_propertyAccessor_synthetic() {
+    indexTestUnit(r'''
+class A {
+  int fff;
+}
+
+main(A a) {
+  print(a.fff);
+}
+''');
+    _createRefactoring('fff);');
+    // error
+    return _assertInvalidSelection();
+  }
+
   test_bad_reference_toClassMethod() {
     indexTestUnit(r'''
 class A {