Create AST structure for asserts in constructor initializers

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 118 matching lines @@
     return super.visitArgumentList(node);
   }
 
   @override
   Object visitAsExpression(AsExpression node) {
     _checkForUnnecessaryCast(node);
     return super.visitAsExpression(node);
   }
 
   @override
+  Object visitAssertInitializer(AssertInitializer node) {
+    _checkForPossibleNullCondition(node.condition);
+    return super.visitAssertInitializer(node);
+  }
+
+  @override
   Object visitAssertStatement(AssertStatement node) {
     _checkForPossibleNullCondition(node.condition);
     return super.visitAssertStatement(node);
   }
 
   @override
   Object visitAssignmentExpression(AssignmentExpression node) {
     TokenType operatorType = node.operator.type;
     if (operatorType == TokenType.EQ) {
       _checkForUseOfVoidResult(node.rightHandSide);
@@ skipping 2643 matching lines @@
   Set<AstNode> _enclosingBlockBreaksLabel = new Set<AstNode>();
 
   @override
   bool visitArgumentList(ArgumentList node) =>
       _visitExpressions(node.arguments);
 
   @override
   bool visitAsExpression(AsExpression node) => _nodeExits(node.expression);
 
   @override
+  bool visitAssertInitializer(AssertInitializer node) => false;
+
+  @override
   bool visitAssertStatement(AssertStatement node) => false;
 
   @override
   bool visitAssignmentExpression(AssignmentExpression node) {
     Expression leftHandSide = node.leftHandSide;
     if (_nodeExits(leftHandSide)) {
       return true;
     }
     TokenType operatorType = node.operator.type;
     if (operatorType == TokenType.AMPERSAND_AMPERSAND_EQ ||
@@ skipping 7927 matching lines @@
       return null;
     }
     if (identical(node.staticElement, variable)) {
       if (node.inSetterContext()) {
         result = true;
       }
     }
     return null;
   }
 }