tests/gtest-176.cs

   1 class lis<a> {}
   2
   3 abstract class fn <a,b,r> {
   4   public abstract r apply (a x,b y);
   5 }
   6
   7 class fn1<a> : fn <lis<a>,lis<a>,lis<a>>
   8 {
   9   public override lis<a> apply (lis<a> x,lis<a> y)
  10   {
  11     return M.RevAppend (x,y);
  12   }
  13 }
  14
  15 class M {
  16     public static b FoldLeft<a, b> (a x, b acc, fn<a, b, b> f)
  17     {
  18         return f.apply (x, acc);
  19     }
  20
  21     public static lis<a> RevAppend<a> (lis <a> x , lis <a> y)  {
  22       return x;
  23     }
  24
  25     public static lis <lis <a>> Concat<a> (lis <lis <a>> l)
  26     {
  27       return FoldLeft<lis<lis<a>>, lis<lis<a>>> (l, new lis<lis<a>> (), new
  28 fn1<lis<a>> ());
  29     }
  30
  31         public static void Main ()
  32         {
  33           M.Concat (new lis<lis<string>> ());
  34         }
  35 }