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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang fails to compile call to instance of function-typed variable template"
href="https://bugs.llvm.org/show_bug.cgi?id=50170">50170</a>
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<th>Summary</th>
<td>clang fails to compile call to instance of function-typed variable template
</td>
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<th>Product</th>
<td>clang
</td>
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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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++17
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>simon.giesecke@gmail.com
</td>
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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>clang version 9 to 12 fail to compile the following code:
```
template <typename T, bool A>
void funcTemplate() {}
template <typename T>
struct Traits {
template <bool A>
static inline constexpr auto func =
funcTemplate<T, A>;
};
template<typename T>
void use() {
const auto func = Traits<T>::template func<false>;
func();
}
int main() {
use<int>();
}
```
with the following diagnostics:
```
<source>:15:3: error: called object type 'auto' is not a function or function
pointer
func();
^~~~
<source>:19:5: note: in instantiation of function template specialization
'use<int>' requested here
use<int>();
```
clang 8 and recent gcc versions compile this correctly.</pre>
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