<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/61121>61121</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            overload resolution issue when using user-defined conversion operator to const rvalue reference
        </td>
    </tr>

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

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

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

<pre>
    https://godbolt.org/z/4nrqj7n3o
```cpp
constexpr int f(int&&) { return 1; }
constexpr int f(const int&&) { return 2; }

struct A {
  constexpr operator const int&&() const {
 return static_cast<const int&&>(ref);
  }
  const int&& ref;
};

constexpr int i{42};
constexpr A a{static_cast<const int&&>(i)};

// Implicit conversion to function argument
// Clang: error: no viable conversion from 'A' to 'int'
// GCC & MSVC: OK
static_assert(f(a) == 2);

// Explicit call: OK
static_assert(f(a.operator const int&&()) == 2);

// Implicit call: OK
const int&& ref = a;
```
</pre>
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