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  1. // @flow
  2.  
  3. // Filter the contents of an array
  4.  
  5.  
  6. declare function my_filter<T, P: $Pred<1>>(v: Array<T>, cb: P): Array<$Refine<T,P,1>>;
  7.  
  8. type A = { kind: 'A', u: number }
  9. type B = { kind: 'B', v: string }
  10. type C = { kind: 'C', y: boolean }
  11. type D = { kind: 'D', x: boolean }
  12. type E = { kind: 'E', y: boolean }
  13.  
  14. declare var ab: Array<A|B|C>;
  15.  
  16. (my_filter(ab, (x): %checks => x.kind === 'A'): Array<A>);    // OK
  17. (my_filter(ab, (x): %checks => x.kind !== 'A'): Array<B|C>);  // OK
  18.  
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