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  1. /* @noflow */
  2.  
  3. interface IFoo { foo: string }
  4.  
  5. class C1 implements IFoo {} // error: property `foo` not found
  6. class C2 implements IFoo { foo: number } // error: number <~> string
  7. class C3 implements IFoo { foo: string } // ok
  8.  
  9. (new C1: IFoo); // ok, we already errored at def site
  10.  
  11. interface IBar { bar: number }
  12.  
  13. class C4 implements IFoo, IBar {} // error: properties `foo`, `bar` not found
  14. (new C4: IBar); // ok, we already errored at def site
  15.  
  16. interface IFooBar extends IFoo { bar: number }
  17.  
  18. class C5 implements IFooBar {} // error: properties `foo`, `bar` not found
  19. (new C5: IFooBar); // ok, already errored at def site
  20. (new C5: IFoo); // ok, already errored at def site
  21. (new C5: IBar); // error: property `bar` not found (despite IBar < IFooBar)
  22.  
  23. class C6 extends C1 {}
  24. (new C6: IFoo); // ok, C1 implements IFoo
  25.  
  26. class C7 implements C1 {} // error: C1 is a class, expected an interface
  27.  
  28. // ensure BoundT substituted appropriately
  29. interface IPoly<T> { x: T }
  30. class C8<T> implements IPoly<T> { x: T }
  31.  
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