fix hints from analyzer in analyzer

pkg/analyzer/test/generated/all_the_rest_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 analyzer.test.generated.all_the_rest_test;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/src/dart/element/element.dart';
@@ skipping 6338 matching lines @@
     expect(variable.name, variableName);
     expect(variable.isConst, isFalse);
     expect(variable.isFinal, isTrue);
     expect(variable.isSynthetic, isFalse);
     expect(variable.getter, isNotNull);
     expect(variable.setter, isNull);
   }
 
   void _assertHasDocRange(
       Element element, int expectedOffset, int expectedLength) {
-    SourceRange docRange = element.docRange;
+    // Cast to dynamic here to avoid a hint about @deprecated docRange.
+    SourceRange docRange = (element as dynamic).docRange;
     expect(docRange, isNotNull);
     expect(docRange.offset, expectedOffset);
     expect(docRange.length, expectedLength);
   }
 
   void _useParameterInMethod(
       FormalParameter formalParameter, int blockOffset, int blockEnd) {
     Block block = AstFactory.block();
     block.leftBracket.offset = blockOffset;
     block.rightBracket.offset = blockEnd - 1;
@@ skipping 1874 matching lines @@
     expect(UriKind.fromEncoding(0x70), same(UriKind.PACKAGE_URI));
     expect(UriKind.fromEncoding(0x58), same(null));
   }
 
   void test_getEncoding() {
     expect(UriKind.DART_URI.encoding, 0x64);
     expect(UriKind.FILE_URI.encoding, 0x66);
     expect(UriKind.PACKAGE_URI.encoding, 0x70);
   }
 }