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    <head>
      <base href="http://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - DIDescriptor::isLexicalBlock() returns true for DILexicalBlockFile"
   href="http://llvm.org/bugs/show_bug.cgi?id=21279">21279</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>DIDescriptor::isLexicalBlock() returns true for DILexicalBlockFile
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Core LLVM classes
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>dexonsmith@apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>DIDescriptor::isLexicalBlock() returns true for DILexicalBlockFile.  This
doesn't make sense, since DILexicalBlockFile::Verify() would return false.  It
causes problems (e.g.) in pretty printing, because the "identity" of
DIDescriptors is checked like:

      // ...
    } else if (DI.isLexicalBlock()) {
      // ...
    } else if (DI.isLexicalBlockFile()) {
      // ...

I tried to fix this as a drive-by as part of PR17891 in r218914, but it caused
a problem building Asan so I had to back it out.

I haven't seen any other real problems (besides pretty printing) but it's a
time bomb.</pre>
        </div>
      </p>
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