<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 - Misleading error message 'this' was not captured for this lambda function"
href="https://bugs.llvm.org/show_bug.cgi?id=41410">41410</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Misleading error message 'this' was not captured for this lambda function
</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>enhancement
</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>gabriel.aubut-lussier@outlook.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>The error message given when 'this' cannot be captured is misleading in the
sense that it points the user to the lambda that fails to capture 'this' rather
than raise questions about why it fails to do so.
The icc compiler does the best job of giving context with this error. MSVC also
displays a bit more information. Clang has the worst offender. GCC could use a
bit of improvement. Aiming for an error message that is closer to icc seems
like the ideal solution. The error message given by icc is the following:
error: this enclosing-function local variable cannot be referenced in this
lambda body because an enclosing lambda does not allow implicit captures
Godbolt : <a href="https://gcc.godbolt.org/z/rmefHT">https://gcc.godbolt.org/z/rmefHT</a>
Sample code for the issue:
struct S
{
void f() {
[]() {
[this]() {
}();
}();
}
};
int main()
{
S s;
s.f();
}</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>