<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 --- - Valid return type deduction for lambda functions not valid in C++14"
   href="http://llvm.org/bugs/show_bug.cgi?id=22710">22710</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Valid return type deduction for lambda functions not valid in C++14
          </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>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>C++14
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>lvoufo@gmail.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>Clang accepts the following in C++11 mode, but not in C++14 mode.

$ cat a.cpp
struct C {
  void test() {
    auto in = +[](decltype(this) t) { return true;};
  }
};
$
$ clang++ -std=c++1y fileB.cpp -c
fileB.cpp:83:14: error: cannot deduce return type 'bool (*)(decltype(this))'
from returned value of type 'bool (decltype(this))'
  auto in = +[](decltype(this) t) { return true;};
             ^
1 error generated.
$</pre>
        </div>
      </p>
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