fix inference of object members when a method has no target

pkg/analyzer/test/generated/resolver_test.dart

Index: pkg/analyzer/test/generated/resolver_test.dart
diff --git a/pkg/analyzer/test/generated/resolver_test.dart b/pkg/analyzer/test/generated/resolver_test.dart
index 6f7d3db9f825009422ab20302e77beba2d4819c4..556e4187017760bd7a352bb4a6468f587ad69f56 100644
--- a/pkg/analyzer/test/generated/resolver_test.dart
+++ b/pkg/analyzer/test/generated/resolver_test.dart
@@ -12172,6 +12172,20 @@ main() {
         code, typeProvider.dynamicType, typeProvider.intType);
   }
 
+  void test_localVariableInference_declaredType_disabled_for_toString() {
+    String name = 'toString';
+    String code = '''
+main() {
+  dynamic $name = () => null;
+  $name(); // marker
+}''';
+    SimpleIdentifier identifier = _findMarkedIdentifier(code, "$name = ");
+    expect(identifier.staticType, typeProvider.dynamicType);
+    SimpleIdentifier call = _findMarkedIdentifier(code, "(); // marker");
+    expect(call.staticType, typeProvider.dynamicType);
+    expect((call.parent as Expression).staticType, typeProvider.dynamicType);
+  }
+
   void test_localVariableInference_noInitializer_disabled() {
     String code = r'''
 main() {