<html>
    <head>
      <base href="https://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 --- - Regression in std::vector initialization in clang++ 3.9.x"
   href="https://llvm.org/bugs/show_bug.cgi?id=31623">31623</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Regression in std::vector initialization in clang++ 3.9.x
          </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>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>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>dane@mapbox.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>clang 3.9.0 and 3.9.1 refuse to compile code that worked in 3.8.1:

```
#include <mapbox/geometry/polygon.hpp>

int main() {
    mapbox::geometry::polygon<double> polygon = {{ {{ { 0, 0 }, { 0, 45 }, {
45, 45 }, { 45, 0 } }} }};
}
```

mapbox/geometry/polygon.hpp can be found here:
<a href="https://github.com/mapbox/geometry.hpp/blob/master/include/mapbox/geometry/polygon.hpp">https://github.com/mapbox/geometry.hpp/blob/master/include/mapbox/geometry/polygon.hpp</a>

That errors with: `error: no matching constructor for initialization of 'const
mapbox::geometry::linear_ring<double, std::vector>'.

However this works:

```
Polygon<double> polygon = { {{ { 0, 0 }, { 0, 45 }, { 45, 45 }, { 45, 0 } }} };
```</pre>
        </div>
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