title: Can we declare a file scope identifier with internal linkage without the static keyword?
body: <p>Section 6.11.2 of the C standard states one of the features that may be deprecated in future versions:</p>
  
  <blockquote>
    <p>Declaring an identifier with internal linkage at file scope without
    the static storage-class specifier is an obsolescent feature.</p>
  </blockquote>
  
  <p>How is it even possible to declare a file scope identifier to have internal linkage without the static storage-class specifier?</p>