<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 - Valid code fails with "reference to local variable declared in enclosing function""
href="https://bugs.llvm.org/show_bug.cgi?id=42406">42406</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Valid code fails with "reference to local variable declared in enclosing function"
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>8.0
</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++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>realnc@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>The following code fails to compile with Clang 4.0.0 and newer. The last
version that can compile this code is 3.9.1 (tested on godbolt.org.)
template <int>
struct S {
constexpr int val() const { return 0; }
};
template <typename = void>
S<0> foo()
{
S<0> s;
return S<s.val()>{};
}
int main()
{
foo();
}
Build with -std=c++11 or higher.
Error message:
error: reference to local variable 's' declared in enclosing function 'foo'
return S<s.val()>{};
^
note: in instantiation of function template specialization 'foo<void>'
requested here
foo();
^
note: 's' declared here
S<0> s;
^
1 error generated.
When making foo() a non-template, the error disappears:
S<0> foo()
{
S<0> s;
return S<s.val()>{};
}</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>