anchor.diff:      this.namedArguments = const {},
       this.typeArguments,
       this.name,
  -  ])
  -      : type = InvokeExpressionType.constInstance;
  +  ]) : type = InvokeExpressionType.constInstance;
   
     @override
     R accept<R>(ExpressionVisitor<R> visitor, [R context]) {
  
positive.code:     this.namedArguments = const {},
      this.typeArguments,
      this.name,
    ])
        : type = InvokeExpressionType.newInstance;
  
    @visibleForTesting
    const InvokeExpression.constOf(
  
negative.code:     this.namedArguments = const {},
      this.typeArguments,
      this.name,
    ]) : type = null;
  
    @visibleForTesting
    const InvokeExpression.newOf(
  