mcs/tests/test-pattern-08.cs

   1 using System.Collections.Generic;
   2
   3 class Expr
   4 {
   5         public int Field;
   6         public Expr Next;
   7 }
   8
   9 static class X
  10 {
  11         public static IEnumerable<int> Test (this Expr expr)
  12         {
  13                 var exprCur = expr;
  14                 while (exprCur != null)
  15                 {
  16                         if (exprCur is Expr list)
  17                         {
  18                                 yield return list.Field;
  19                                 exprCur = list.Next;
  20                         }
  21                         else
  22                         {
  23                                 yield return 2;
  24                                 yield break;
  25                         }
  26                 }
  27         }
  28
  29         public static void Main ()
  30         {
  31         }
  32 }