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  1. declare class T {}
  2. declare class U {}
  3.  
  4. declare class A {}
  5. declare class B extends A {}
  6.  
  7. type O1 = {...{p:T}&{q:U}};
  8. declare var o1: O1;
  9. (o1: {p?:T,q?:U}); // ok
  10.  
  11. type O2 = {...{p:A}&{p:B}};
  12. declare var o2: O2;
  13. (o2: {p?:B}); // ok
  14. ({p: new B}: O2); // ok
  15. ({p: new A}: O2); // error: A ~> B
  16.  
  17. type O3 = {...{p:A}&{[string]:B}};
  18. declare var o3: O3;
  19. (o3: {p:B,[string]:B});// ok: A&B = B
  20. (o3.q: B); // ok
  21.  
  22. type O4 = {...{[string]:A}&{p:B}};
  23. declare var o4: O4;
  24. (o4: {p:B,[string]:A}); // ok: A&B = B
  25.  
  26. type O5 = {...{[string]:A}&{[string]:B}};
  27. declare var o5: O5;
  28. (o5: {[string]:B}); // ok: A&B = B
  29.  
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