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  1. /**
  2.  * test Promise name resolution
  3.  * @flow
  4.  */
  5.  
  6. /**
  7.  * 1. introduce shadowing bindings for important names
  8.  */
  9. class Promise {}
  10.  
  11. /**
  12.  * 2. implicit refs to Promise during desugaring should be unaffected
  13.  */
  14. async function foo(x: boolean) {
  15.   if (x) {
  16.     return {bar: 'baz'};
  17.   } else {
  18.     return null;
  19.   }
  20. }
  21.  
  22. async function run() {
  23.   console.log(await foo(true));
  24.   console.log(await foo(false));
  25. }
  26.  
  27. run();
  28.  
  29. /**
  30.  * 3. but explicit name refs from code and annos resolve
  31.  * using the usual rules
  32.  */
  33. // error: `Promise` in return expr is the local binding
  34. async function bar() {
  35.   return Promise.resolve(0);
  36. }
  37.  
  38. // error: return type anno is a ref to the local binding
  39. async function baz(): Promise<number> {
  40.   return 0;
  41. }
  42.  
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