Supress deprecation warnings in a deprecated library

pkg/analyzer/lib/src/generated/resolver.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.src.generated.resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 38 matching lines @@
   /**
    * The class containing the AST nodes being visited, or `null` if we are not in the scope of
    * a class.
    */
   ClassElement _enclosingClass;
 
   /**
    * A flag indicating whether a surrounding member (compilation unit or class)
    * is deprecated.
    */
-  bool inDeprecatedMember = false;
+  bool inDeprecatedMember;
 
   /**
    * The error reporter by which errors will be reported.
    */
   final ErrorReporter _errorReporter;
 
   /**
    * The type Future<Null>, which is needed for determining whether it is safe
    * to have a bare "return;" in an async method.
    */
@@ skipping 11 matching lines @@
 
   /**
    * Create a new instance of the [BestPracticesVerifier].
    *
    * @param errorReporter the error reporter
    */
   BestPracticesVerifier(
       this._errorReporter, TypeProvider typeProvider, this._currentLibrary,
       {TypeSystem typeSystem})
       : _futureNullType = typeProvider.futureNullType,
-        _typeSystem = typeSystem ?? new TypeSystemImpl();
+        _typeSystem = typeSystem ?? new TypeSystemImpl() {
+    inDeprecatedMember = _currentLibrary.isDeprecated;
+  }
 
   @override
   Object visitAnnotation(Annotation node) {
     if (node.elementAnnotation?.isFactory == true) {
       AstNode parent = node.parent;
       if (parent is MethodDeclaration) {
         _checkForInvalidFactory(parent);
       } else {
         _errorReporter
             .reportErrorForNode(HintCode.INVALID_FACTORY_ANNOTATION, node, []);
@@ skipping 11067 matching lines @@
       return null;
     }
     if (identical(node.staticElement, variable)) {
       if (node.inSetterContext()) {
         result = true;
       }
     }
     return null;
   }
 }