content: // @flow
  
  import React from 'react';
  
  // OK: Builtin intrinsics do not need any children.
  <builtin />;
  
  // OK: The builtin intrinsics allow any children.
  <builtin>
    {}
    {undefined}
    {null}
    {true}
    {false}
    {0}
    {42}
    {'hello world'}
    foobar
    <buz />
    {[undefined, null, true, false, 0, 42, 'hello world', 'foobar', <buz />]}
  </builtin>;
  
  // Error: Arbitrary objects are not allowed as children for builtin intrinsics.
  <builtin>
    {{a: 1, b: 2, c: 3}}
  </builtin>;
  