1  
 2  program test.alpha {
 3      struct Foo {
 4          foo: [Foo; 1],
 5      }
 6  
 7      struct Bar {
 8          baz: [Baz, 2],
 9      }
10  
11      struct Baz {
12          bar: [Bar, 3],
13      }
14  
15      struct One {
16          two: [Two, 2],
17      }
18  
19      struct Two {
20          three: [Three, 3],
21          four: [Four, 4],
22      }
23  
24      struct Three {
25          one: [One, 1],
26      }
27  
28      struct Four {
29          one: [One, 1],
30      }
31  }