<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64528>64528</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Function declaration at block scope is bound in surrounding scope
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    So recently I ran into a bug on [MSVC](https://developercommunity.visualstudio.com/t/Forward-declarations-inside-of-a-functio/10432628) , during testing and research into this issue me and some other folks ran into a issue that's somewhat similar. 

If you take the following code sample this shouldn't compile as specified in the following draft[https://eel.is/c++draft/dcl.dcl#dcl.meaning.general-3.5] 

> If the declaration inhabits a block scope S and declares a function ([[dcl.fct]](https://eel.is/c++draft/dcl.dcl#dcl.fct)) or uses the extern specifier, the declaration shall not be attached to a named module ([[module.unit]](https://eel.is/c++draft/module.unit)); its target scope is the innermost enclosing namespace scope, but the name is bound in S[.](https://eel.is/c++draft/dcl.dcl#dcl.meaning.general-3.5.sentence-1)

```cpp
namespace Foo
{   
        void SomeOuterFunc()
        {
                void someFunc(int);
                someFunc(0);
        }
}

void Foo::someFunc(int)
{
}


int main() {
 Foo::SomeOuterFunc();
}
```

So with that, this shouldn't compile on Clang and should produce an error similar to GCC
```
<source>:10:6: warning: 'void Foo::someFunc(int)' has not been declared within 'Foo'
 10 | void Foo::someFunc(int)
      |      ^~~
<source>:5:22: note: only here as a 'friend'
    5 |                 void someFunc(int);
      | 
 ```` 

or MSVC 
```
1>main.cpp(17,11): error C2039: 'someFunc': is not a member of 'Foo'
1>main.cpp(8): message : see declaration of 'Foo'
```
</pre>
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