DecisionTree.ToCode() returns code that does not compile

[ar7z1]

DecisionTreeWriter adds ArgumentException to generated code:

writer.WriteLine(indent + "else throw new ArgumentException(\"input\", \"Unexpected value at position " + attributeIndex + ".\");");

But generated "usings" section does not contain using System; (ArgumentException lies there):

writer.WriteLine("    using System.CodeDom.Compiler;");
writer.WriteLine("    using System.Collections.Generic;");