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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 - Conditional explicit not respected with out-of-line definition"
   href="https://bugs.llvm.org/show_bug.cgi?id=42980">42980</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Conditional explicit not respected with out-of-line definition
          </td>
        </tr>

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

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

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

        <tr>
          <th>OS</th>
          <td>Windows NT
          </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++2a
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>barry.revzin@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Reduced from StackOverflow (<a href="https://stackoverflow.com/q/57467490/2069064">https://stackoverflow.com/q/57467490/2069064</a>):

using size_t = decltype(sizeof(0));

struct Str {
    template <size_t N>
    explicit(N > 7) Str(char const (&str)[N]);
};

#ifdef OUT_OF_LINE
template <size_t N>
Str::Str(char const(&str)[N]) { }
#endif

Str a = "short";
Str b = "not so short";

As-is, clang correctly rejects the construction of b (since that constructor is
explicit). But with -DOUT_OF_LINE, clang accepts.</pre>
        </div>
      </p>


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