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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Non-exported aliased type used through exported type alias is not reachable"
href="https://bugs.llvm.org/show_bug.cgi?id=52281">52281</a>
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<th>Summary</th>
<td>Non-exported aliased type used through exported type alias is not reachable
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>compile-fail
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>johelegp@gmail.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, johelegp@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<div>
<pre>See <a href="https://godbolt.org/z/qzd1aaqP3">https://godbolt.org/z/qzd1aaqP3</a>
mod.cpp:
```C++
export module mod;
struct t { };
export using u = t;
```
test.cpp:
```C++
import mod;
int main() {
u v{};
}
```
Output:
```
test.cpp:3:5: error: definition of 't' must be imported from module 'mod'
before it is required
u v{};
^
mod.cpp:2:8: note: definition here is not reachable
struct t { };
^
```
With templates: <a href="https://godbolt.org/z/81f3ocjfW">https://godbolt.org/z/81f3ocjfW</a>.</pre>
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