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  1. // @flow
  2.  
  3. declare function my_filter<T, P: $Pred<1>>(v: Array<T>, cb: P): Array<$Refine<T,P,1>>;
  4.  
  5. // Sanity check A: filtering the wrong type
  6. declare var a: Array<mixed>;
  7. const b = my_filter(a, is_string);
  8. (b: Array<number>);
  9.  
  10.  
  11. // Sanity check B: Passing non-predicate function to filter
  12. declare var c: Array<mixed>;
  13. const d = my_filter(c, is_string_regular);
  14. (d: Array<string>);
  15.  
  16. function is_string(x): boolean %checks {
  17.   return typeof x === "string";
  18. }
  19.  
  20. function is_string_regular(x): boolean {
  21.   return typeof x === "string";
  22. }
  23.  
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