title: Source information is missing from the debug information for this module (for free function)
body: <p>I'm debugging a (.c) project in VS 2019. when I reach <code>free</code> function I receive this message(same for (.cpp)):</p>
  
  <blockquote>
    <p><strong>Source not available</strong></p>
    
    <p>Source information is missing from the debug information for this
    module</p>
    
    <p>You can view disassembly in the Disassembly window. To always view
    disassembly for missing source files, change the setting in the
    Options dialog.</p>
  </blockquote>
  
  <p>can some please tell me what should I do?</p>