<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/77970>77970</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Support Wchanges-meaning?
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            enhancement,
            clang:diagnostics
      </td>
    </tr>

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

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

<pre>
    Currently given the following C++ code:

```cpp
enum {i=1};

class A {
  char arr[i]; 
  enum {i=2}; // IFNDR changes meaning of i
}; 

struct B {};
struct C {
    typedef B B_type;

    void B(); // IFNDR changes meaning of B
};
```

gcc diagnoses this code under `-Wchanges-meaning`: https://godbolt.org/z/rY4W5h31n

This IFNDR according to [class.member.lookup p6](https://eel.is/c++draft/class.member.lookup#6)

[gcc used to diagnose this under -fpermissive](https://developers.redhat.com/articles/2023/06/21/new-c-features-gcc-13).

Maybe we should also consider supporting this diagnostic.
</pre>
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