<html>
    <head>
      <base href="https://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Template alias crashes template diffing"
   href="https://llvm.org/bugs/show_bug.cgi?id=27129">27129</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Template alias crashes template diffing
          </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>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Keywords</th>
          <td>crash-on-invalid
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>C++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>benny.kra@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org, rtrieu@google.com
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>$ cat crash.cc
template <typename T>
class vector {};

template <int Dimension>
class Point;
template <int dimension, typename T>
using Polygon = vector<Point<dimension>>;

void foo(Polygon<3, float>);
void bar() { foo(Polygon<2, float>()); }

$ clang crash.cc -std=c++11
crash.cc:10:14: error: no matching function for call to 'foo'
void bar() { foo(Polygon<2, float>()); }
             ^~~
unknown ArgumentKind
UNREACHABLE executed at llvm/tools/clang/lib/AST/ASTDiagnostic.cpp:1169!</pre>
        </div>
      </p>
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