Problem with return string in function

[Yehudit R]

I want to return string in a function, this is my function:

public expression(curLine:String):String

      {

          print("expression");

          term(curLine);

          mutable l = input.ReadLine();

          while(l.Contains("+")||l.Contains("-")||l.Contains("> / <")||l.Contains("&amp")||l.Contains("|")||l.Contains("&gt")||l.Contains("&lt")||l.Contains("="))

          {

              printLine(l);//op

              term(input.ReadLine());//term

              l = input.ReadLine();

          }

          print("/expression");

          if(l!=null)

            return "vhvh";

          else return "xbb";

      }

and I got the following error:

Cannot implicitly convert type 'void' to 'string'.

What am I doing wrong?

Thank you!

[Dustin Mays]

You don't need to use the 'return' keyword. Nemerle automatically returns the last-evaluated expression.

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[Yehudit R]

Yes, it worked, Thank you!!