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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect ODR error with lambda of unevaluated context of c++20"
href="https://bugs.llvm.org/show_bug.cgi?id=52073">52073</a>
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<th>Summary</th>
<td>Incorrect ODR error with lambda of unevaluated context of c++20
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>nickhuang99@hotmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>c++20 support lambda of unevaluated context and following is example from
standard[temp.over.link#example-3] to stress that they are not violation of ODR
because each lambda is unique. Two lambda-expressions are never considered
equivalent. The following defines two different functions.
template <int N> void f(const char (*s)[([]{ return N; })()]) { }
template <int N> void f(const char (*s)[([]{ return N; })()]) { }
The test (<a href="https://www.godbolt.org/z/37Ya1h44c">https://www.godbolt.org/z/37Ya1h44c</a>) shows clang-13 not supporting by
giving error of violation of ODR.
<source>:3:23: error: redefinition of 'f'
template <int N> void f(const char (*s)[([]{ return N; })()]) { }
^
<source>:2:23: note: previous definition is here
template <int N> void f(const char (*s)[([]{ return N; })()]) { }
^
1 error generated.
Compiler returned: 1</pre>
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