// CS0029: Cannot implicitly convert type `string' to `Test.String' // Line: 38 using System; namespace Test { using Text = System.Text; using Str = System.String; public class String { string s; public String(string s) { this.s=s; } public static implicit operator Str (String s1) { if(s1==null) return null; return s1.ToString(); } } } namespace TestCompiler { using String=Test.String; class MainClass { public static void Main(string[] args) { Console.WriteLine("Hello World!"); String a="bonjour"; int i=1; Console.WriteLine(i+a); } } }