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  1. // @flow
  2.  
  3. class Base {}
  4. class Middle extends Base {}
  5. class Child extends Middle {}
  6.  
  7. class C<T: Middle> {
  8.   meth(a: T): T {
  9.     return a;
  10.   }
  11. }
  12.  
  13. // T is implicitly (bounded by) Middle in constructor call if not provided.
  14. // Explicit type arg is required in annotation - here a wildcard captures it.
  15. var a: C<*> = new C();
  16.  
  17. a.meth(new Middle());
  18. a.meth(new Child());
  19. a.meth(42); // Error: number ~> Middle
  20. a.meth(new Base()); // Error: Base ~> Middle
  21.  
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