<html>
    <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 --- - conversion of a string to unsigned long long (ULLONG_MAX) fails."
   href="http://llvm.org/bugs/show_bug.cgi?id=15913">15913</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>conversion of a string to unsigned long long (ULLONG_MAX) fails.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.2
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Macintosh
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>MacOS X
          </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>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>hhinnant@apple.com
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>denis@ddenis.info
          </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>#include <iostream>
#include <sstream>

int main(int argc, char **argv)
{
  std::string s = "00000000000000000001777777777777777777777";
  std::istringstream ss(s);
  unsigned long long value;
  ss >> value;
  std::cout.flags(std::ios::hex | std::ios::showbase);
  std::cout << value;
}

$ clang++ -std=c++11 -stdlib=libc++ ./stringstreamtest.cpp
$ ./a.out
0xf6b75ab2bc471c71

Instead of expected
0xffffffffffffffff</pre>
        </div>
      </p>
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      <ul>
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