<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/146229>146229</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] [modules] Clang accepts ill-formed program with main attached to named module
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          ashwinbanwari
      </td>
    </tr>
</table>

<pre>
    According to § 6.9.3.1,
```
A program that declares
—(3.1) a variable main that belongs to the global scope, or
—(3.2) a function main that belongs to the global scope and is attached to a named module, or
—(3.3) a function template main that belongs to the global scope, or
—(3.4) an entity named main with C language linkage (in any namespace)
is ill-formed. The name main is not otherwise reserved
```

But having main attached to a named module appears to compile without error with clang as of version 20.1.6.

https://godbolt.org/z/x3nYYfvo7

gcc 15.1 correctly reports:
```
main.cpp:3:5: error: cannot attach '::main' to a named module
    3 | int main() {}
```

I would like to self-assign this issue.
</pre>
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