gcc/testsuite/gdc.test/compilable/test5973.d

   1 // https://issues.dlang.org/show_bug.cgi?id=5973
   2
   3 class A { int a = 1; }
   4 class B { int b = 2; }
   5 class C : A
   6 {
   7     B obj;
   8     alias obj this;
   9     this(){ obj = new B(); }
  10 }
  11 class X : C {}
  12
  13 class D
  14 {
  15     int i;
  16 }
  17
  18 class E
  19 {
  20     D x;
  21     alias x this;
  22 }
  23
  24 class F : E
  25 {
  26     void test()
  27     {
  28         i = 5;
  29     }
  30 }
  31
  32 void main()
  33 {
  34     auto c = new C();
  35     assert(c.a == 1);   // lookup C -> A, OK
  36     assert(c.b == 2);   // lookup C => B, OK
  37
  38     auto x = new X();
  39     assert(x.a == 1);   // lookup X -> C -> A, OK
  40     assert(x.b == 2);   // lookup X -> C => B, NG (Line 17)
  41 }