<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/132600>132600</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] user-defined conversions failed.
        </td>
    </tr>

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

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

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

<pre>
    Given this program 

```cpp
struct Alloc{}; 

struct MyString
{
 MyString();
    MyString(MyString&&, const Alloc&); 
 MyString(MyString&&); 
    MyString(const MyString&, const Alloc&); 
 MyString(const MyString&); 
};

struct A
{
    operator const MyString() const; 
};

int main() {
    MyString s(A{}, Alloc{}); 
    return 0;
}
```

Clang reports error `no viable conversion from 'A' to 'MyString'`, but gcc doesn't complain about it. The issue goes away when I change `operator const` to `operator`. Is this a bug in clang? If yes, I would like to work on this issue. 

link to compiler explorer: https://godbolt.org/z/xKfs8GoPr
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJyMVNGOmzoQ_RrzMlrkmIDJAw8kEavo6kqV2h8wMIAbx0a2STb9-srANpvVqqo0UqyTmTPnjMcI52SvEQuS7kl6jMTkB2OLZhC6Pw_GD9O9GSbdR7Vp78WrvKIGP0gHozW9FRcgtAyR0SWacSS0dN5OjYdSKdMQvif8SJL9mrr-9__9u7dS9wHke0LLB8JywnYkmUGAj_jjmM1xgMZo994oILu10d-q_uQ8ky9UT8n_xv9F4Xva4vzJePlwDABmRCu8sfCZJMxgAb-gktrDRUi9pj3o3uvBEZaX6-jZ4ekmnvxb9JPVQFdqfvx4mUuzgxK6B4ujsd4BWmsskIxqA1cpaoVB5RWtk0ZDZ80FCOMlYRy8CceHJR4o2QHqyUPfNNAadJow7qExl1EJqUHUZvIgfQw_BgTp3ITQG3QgbuIOtwE1nGBeTgwanqdHMjr3fOAkozGc3LKxAuqpB6mhCYZIUsGpgzu6IOkENzOpFpQ8Y-C4GXsGs676LCNe11dJfQ4ZQbJUaAHfRmUsWpKUMHg_OpKUhFWEVb1pa6N8bGxPWPWLsOrtv87lr-abjdoiaXfJTkRYbPiW8c2ObXg0FFSIvOsop11GacYxT7uc5y0mNcs3abuLZMEoS2nCEppv6YbHTd52W9GkrOUNz7uUbClehFSxUtdL6B3N-otNwjJKIyVqVG5-7owtk2AsvHxbhIKXeuod2VIlnXcPCi-9mr8RS0V6hMmhfWmxkxrbDxvgoBNSYRtHk1XFp3lIP0x13JgLYVWgXn9eRmt-YuMJq2apjrBqVXst2O8AAAD__4nabJc">