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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CTAD] User-defined deduction guide not found when argument type is template parameter"
href="https://bugs.llvm.org/show_bug.cgi?id=47175">47175</a>
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<th>Summary</th>
<td>[CTAD] User-defined deduction guide not found when argument type is template parameter
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</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
</td>
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<th>Reporter</th>
<td>cebtenzzre@gmail.com
</td>
</tr>
<tr>
<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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<p>
<div>
<pre>The following code fails to compile with clang:
```
template <typename T>
struct A
{
int i = 42;
A(T) {}
};
template <typename T>
A(T) -> A<T>;
template <typename T>
int foo()
{
T x{};
return A(x).i;
}
int y = foo<int>();
```
$ clang++ -std=c++17 -c test.cpp
test.cpp:15:16: error: member reference base type 'A' is not a structure or
union
Godbolt link: <a href="https://godbolt.org/z/fWKcro">https://godbolt.org/z/fWKcro</a>
GCC, MSVC, and ICC compile this code successfully.</pre>
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