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  1. // @flow
  2.  
  3. /**
  4.  * test nested-promise unwrapping.
  5.  * Note: currently we don't do this properly in the underlying
  6.  * type of the Promise class, which causes spurious errors to
  7.  * be raised here. Once that's fixed, the errors here will go
  8.  * away.
  9.  */
  10.  
  11. async function foo() {
  12.   return 42;
  13. }
  14.  
  15. async function bar() {
  16.   return foo();
  17. }
  18.  
  19. async function baz() {
  20.  
  21.   // a should now be typed as number, but is in fact
  22.   // Promise<number> until nested-promise unwrap is fixed
  23.   var a = await bar();
  24.  
  25.   // TODO this is valid code, but currently gives Promise ~> number error
  26.   // due to lack of transitive Promise unwrap.
  27.   var b: number = a;
  28.  
  29.   // should be number ~> string error, but currently gives
  30.   // Promise ~> string error for the same reason
  31.   var c: string = a;
  32. }
  33.  
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