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  1. // @flow
  2.  
  3. declare var y: mixed;
  4.  
  5. // Sanity check: this should fail, because the preficate function
  6. // checks `y` instead of `x`.
  7. function err(x): %checks {
  8.   return typeof y === "string";
  9. }
  10.  
  11. function foo(x: string | Array<string>): string {
  12.   if (err(x)) {
  13.     return x;
  14.   } else {
  15.     return x.join();
  16.   }
  17. }
  18.  
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