Fix for 'The getter 'isDynamic' was called on null' because of dartbug.com/28515

pkg/analyzer/lib/src/generated/declaration_resolver.dart

 // Copyright (c) 2016, 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.declaration_resolver;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/exception/exception.dart';
 import 'package:analyzer/src/dart/element/builder.dart';
 import 'package:analyzer/src/dart/element/element.dart';
+import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 
 /**
  * A visitor that resolves declarations in an AST structure to already built
  * elements.
  *
  * The resulting AST must have everything resolved that would have been resolved
  * by a [CompilationUnitBuilder] (that is, must be a valid [RESOLVED_UNIT1]).
  * This class must not assume that the [CompilationUnitElement] passed to it is
  * any more complete than a [COMPILATION_UNIT_ELEMENT].
@@ skipping 367 matching lines @@
     super.visitTopLevelVariableDeclaration(node);
     _resolveMetadata(node, node.metadata, node.variables.variables[0].element);
     return null;
   }
 
   @override
   Object visitTypeParameter(TypeParameter node) {
     if (node.parent.parent is FunctionTypedFormalParameter) {
       // Work around dartbug.com/28515.
       // TODO(paulberry): remove this once dartbug.com/28515 is fixed.
-      Element element = new TypeParameterElementImpl.forNode(node.name);
+      var element = new TypeParameterElementImpl.forNode(node.name);
+      element.type = new TypeParameterTypeImpl(element);
       node.name?.staticElement = element;
       return null;
     }
     Element element = _match(node.name, _walker.getTypeParameter());
     super.visitTypeParameter(node);
     _resolveMetadata(node, node.metadata, element);
     return null;
   }
 
   @override
@@ skipping 319 matching lines @@
 class _ElementMismatchException extends AnalysisException {
   /**
    * Creates an exception to refer to the given [compilationUnit], [element],
    * and [cause].
    */
   _ElementMismatchException(
       CompilationUnitElement compilationUnit, Element element,
       [CaughtException cause = null])
       : super('Element mismatch in $compilationUnit at $element', cause);
 }