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    <head>
      <base href="https://bugs.llvm.org/">
    </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 - Implicit conversion of nullptr to bool"
   href="https://bugs.llvm.org/show_bug.cgi?id=38145">38145</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Implicit conversion of nullptr to bool
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>C++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>zhonghao@pku.org.cn
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>DR 1423 has now reached ready status, 

<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1423">http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1423</a>

so this seems like a good reason to consider a compiler change to evaluate
potential code breakages.

bool b1 = nullptr; // Is well-formed today, needs to be ill-formed

I tried clang++ and g++. clang++ accepts the above code, but g++ rejects it:

error:converting to ‘bool’ from ‘std::nullptr_t’ requires direct-initialization
[-fpermissive]
     bool b1 = nullptr; // Is well-formed today, needs to be ill-formed
               ^~~~~~~</pre>
        </div>
      </p>


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