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  1. /**
  2.  * test handling of const params
  3.  * - reassignment prohibited
  4.  * - durable refinements
  5.  *
  6.  * Currently gated in .flowconfig:
  7.  *
  8.  * [options]
  9.  * experimental.const_params
  10.  *
  11.  * Syntax to follow
  12.  *
  13.  * @flow
  14.  */
  15.  
  16. function cannot_reassign(x: string) {
  17.   x = "hey"; // error, const param cannot be reassigned
  18. }
  19.  
  20. // Note: const params use the same machinery as explicit
  21. // const bindings, which are tested more extensively elsewhere.
  22. // Here we're just making sure the machinery is hooked up.
  23. //
  24. function durable_refi(x: ?number) {
  25.   if (x) {
  26.     // ok: if x is truthy here, it's truthy everywhere
  27.     return () => { var y:number = x; };
  28.   }
  29. }
  30.  
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