<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 --- - cannot request the size of an undeduced or dependent auto type"
   href="http://llvm.org/bugs/show_bug.cgi?id=20869">20869</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>cannot request the size of an undeduced or dependent auto type
          </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>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>jeffrey.beu.uz8yz6yl@hotmail.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>Created <span class=""><a href="attachment.cgi?id=13003" name="attach_13003" title="Stderr">attachment 13003</a> <a href="attachment.cgi?id=13003&action=edit" title="Stderr">[details]</a></span>
Stderr

<span class="quote">>clang++ -c crash.cpp</span >
Assertion failed: !A->getDeducedType().isNull() && "cannot request the size of
an undeduced or dependent auto type", file
..\..\..\..\..\tools\clang\lib\AST\ASTContext.cpp, line 1694

Source code is in attachment.
I used a debug build of clang and llvm.

Basically made a typo in
template<class F, class... A> auto make_block(F f, A... a) ->
std::function<decltype(CRASHCLANG(a...))(A...)>

where CRASHCLANG wasn't declared.

I did't use std::function in source code provided to exclude preprocessing
headers.</pre>
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