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  1. // @flow
  2.  
  3. // Sanity check:
  4. // - predicate functions cannot have bodies (can only be declarations)
  5.  
  6. function pred(x: mixed): boolean %checks(typeof x === "string") { // error: cannot use pred type here
  7.   return typeof x === "string";
  8. }
  9.  
  10. function foo(x: string | Array<string>): string {
  11.   if (pred(x)) {
  12.     return x;
  13.   }
  14.   return "1"
  15. }
  16.  
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