<html>
<head>
<base href="https://bugs.llvm.org/">
</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 - Incorrect error message for missing typename keyword on dependent template alias instantiation"
href="https://bugs.llvm.org/show_bug.cgi?id=49829">49829</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Incorrect error message for missing typename keyword on dependent template alias instantiation
</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>enhancement
</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>matthewjbarichello@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Affected versions:
Note: The regression seems to have been introduced in 3.3 as versions < 3.3 do
not exhibit this issue.
- trunk
- 11.0.1
- 11.0.0
- 10.0.1
- 10.0.0
- 9.0.1
- 9.0.0
- 8.0.1
- 8.0.0
- 7.1.0
- 7.0.1
- 7.0.0
- 6.0.1
- 6.0.0
- 5.0.1
- 5.0.0
- 4.0.1
- 4.0.0
- 3.9.1
- 3.9.0
- 3.8.1
- 3.8
- 3.7.1
- 3.7
- 3.6
- 3.5.2
- 3.5.1
- 3.5
- 3.4.1
- 3.3
Driver cmdline:
clang++ -std=c++11
Code:
template<typename>
struct A {
template<typename = void>
using B = void;
};
template<typename T>
using C = A<T>::template B<>;
Expected behaviour:
An error message along the lines of "...missing typename keyword before ..."
Actual behaviour (error message):
<source>:8:11: error: expected a type
using C = A<T>::template B<>;
^
<source>:8:17: error: expected ';' after alias declaration
using C = A<T>::template B<>;
^
;
2 errors generated.
Notes:
- Changing the final 2 lines to the following, compiles as expected:
template<typename T>
using C = typename A<T>::template B<>;
- Possibly related to: <a class="bz_bug_link
bz_status_NEW "
title="NEW - unhelpful error message for missing typename"
href="show_bug.cgi?id=8446">https://bugs.llvm.org/show_bug.cgi?id=8446</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>