content: // @flow
  
  import React from 'react';
  
  const {Suspense} = React;
  
  function Loading() {
    return <div>Loading...</div>;
  }
  
  {
    <Suspense fallback={Loading} /> // Error: function is incompatible with exact React.Element
  }
  
  {
    <Suspense fallback={<Loading/>} />
  }
  
  {
    <Suspense fallback={<Loading/>}>
      <div>Hello</div>
    </Suspense>
  }
  
  {
    <Suspense fallback={<Loading/>}>
      <Suspense />
    </Suspense>
  }
  
  {
    <Suspense fallback={<Loading/>}>
      <Suspense fallback={undefined} />
    </Suspense>
  }
  
  {
    <Suspense fallback={<Loading/>}>
      <Suspense fallback={null} />
    </Suspense>
  }
  