/// <summary>
/// The method that represents the 'exit' function in the language.
/// Exits from the current function, returning any value passed to the function.
/// </summary>
/// <param name="interpreter">The interpreter that the method is being called from.</param>
/// <param name="args">The arguments being passed to the function as a TArgumentList.</param>
/// <returns>The argument passed to the function. If no arguments were passed, it returns TNil.</returns>
public static TType Exit(Interpreter interpreter, TArgumentList args)
{
// Get the argument passed (if any) to return
TType returnValue = TNil.Instance;
if (args.Count > 0) returnValue = args[0];
// Pops from the function stack or kill the interpreter if the stack level is already at it's lowest
// When this method returns, the calling method should check the stack level and exit accordingly
if (interpreter.Stack.Level <= 1) interpreter.Kill();
else interpreter.Stack.Pop();
return returnValue;
}
