fix inference of object members when a method has no target

pkg/analyzer/test/generated/resolver_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library engine.resolver_test;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/context/context.dart' as newContext;
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 12154 matching lines @@
 main() {
   dynamic v = 3;
   v; // marker
 }''';
     _assertPropagatedAssignedType(
         code, typeProvider.dynamicType, typeProvider.intType);
     _assertTypeOfMarkedExpression(
         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() {
   var v;
   v = 3;
   v; // marker
 }''';
     _assertPropagatedAssignedType(
         code, typeProvider.dynamicType, typeProvider.intType);
     _assertTypeOfMarkedExpression(
@@ skipping 2551 matching lines @@
         // check propagated type
         FunctionType propagatedType = node.propagatedType as FunctionType;
         expect(propagatedType.returnType, test.typeProvider.stringType);
       } on AnalysisException catch (e, stackTrace) {
         thrownException[0] = new CaughtException(e, stackTrace);
       }
     }
     return null;
   }
 }