<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/147328>147328</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang: compile implicitly an convertion from integral to enum class (error excepted)
        </td>
    </tr>

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

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

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

<pre>
    With this code:

```cpp
enum class E { a,b,c};

int main()
{  
  E e;    
  e = {1};
} 
```

Clang 18,19,20 and trunk compile without error.

Narrowing conversion gives a error, but the diagnostic is not appropriate:

```cpp
long long ll = 0;
e = {ll}; // non-constant-expression cannot be narrowed from type
          // 'long long' to 'E' in initializer list [-Wc++11-narrowing]
```

Gcc:

```cpp
test.cpp: In function ‘int main()’:
test.cpp:6:9: error: cannot convert ‘<brace-enclosed initializer list>’ to ‘E’ in assignment
    6 |   e = {1};
      |         ^
```

</pre>
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