Fix for instance fields inference when a setter has no parameter.

pkg/analyzer/test/src/summary/top_level_inference_test.dart

Index: pkg/analyzer/test/src/summary/top_level_inference_test.dart
diff --git a/pkg/analyzer/test/src/summary/top_level_inference_test.dart b/pkg/analyzer/test/src/summary/top_level_inference_test.dart
index 9ed86a7d18cfa62e0bfb0cd6da5a2a7e87390e77..9ae0ad563ca290b6e8eeab521c1e1a6e84bc8da0 100644
--- a/pkg/analyzer/test/src/summary/top_level_inference_test.dart
+++ b/pkg/analyzer/test/src/summary/top_level_inference_test.dart
@@ -1450,6 +1450,27 @@ Null V;
 ''');
   }
 
+  test_instanceField_error_noSetterParameter() async {
+    var library = await _encodeDecodeLibrary(r'''
+abstract class A {
+  int x;
+}
+class B implements A {
+  set x() {}
+}
+''');
+    checkElementText(
+        library,
+        r'''
+abstract class A {
+  int x;
+}
+class B implements A {
+  void set x() {}
+}
+''');
+  }
+
   test_instanceField_fieldFormal() async {
     var library = await _encodeDecodeLibrary(r'''
 class A {