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    <head>
      <base href="http://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 --- - constexpr variable template in template member function can't be constant expression"
   href="http://llvm.org/bugs/show_bug.cgi?id=19571">19571</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>constexpr variable template in template member function can't be constant expression
          </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>Severity</th>
          <td>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>C++1y
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>lin90162@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>Hi.
I've found a bug related with variable template following yesterday's <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Partial specialization of variable template causes 'unused variable' warning illegally."
   href="show_bug.cgi?id=19558">bug
19558</a>.

constexpr variable template used in template member function can't be a
constant expression.

// Test code
template<class T>
constexpr bool is_pointer = false;

template<class T>
constexpr bool is_pointer<T *> = true;

struct X {
    template<class T>
    void f(){
        static_assert( is_pointer<int *>, "is_pointer<int *>" );
    }
};

int main()
{
    X{}.f<int>();   // Error occurs here
    return 0;
}
// End of test code


Compiler output:
prog.cc:10:24: error: static_assert expression is not an integral constant
expression
        static_assert( is_pointer<int *>, "is_pointer<int *>" );
                       ^~~~~~~~~~~~~~~~~
1 error generated.



I executed above code with clang 3.5 HEAD (trunk 206991) on Linux PC.

<a href="http://melpon.org/wandbox/permlink/MgEFu1WBEhMKymbw">http://melpon.org/wandbox/permlink/MgEFu1WBEhMKymbw</a></pre>
        </div>
      </p>
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