<html>
    <head>
      <base href="https://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 --- - Template arg deduction fails for alias, works w/o alias"
   href="https://llvm.org/bugs/show_bug.cgi?id=26017">26017</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Template arg deduction fails for alias, works w/o alias
          </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>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>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>jascha@jawset.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>template<class Sig>
struct Foo {
    Foo(const Sig&) {}
};

template<class... Args>
using FooAlias = Foo<void(Args...)>;

template<class... Args>
// compiles:
// void bar(const Foo<void(Args...)>&)
// error: no matching function for call to 'bar'
void bar(const FooAlias<Args...>&)
{}

void baz() {}

int main() {
    bar(FooAlias<>(baz));
}</pre>
        </div>
      </p>
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