<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/102064>102064</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            `__noop` not marked as constexpr
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang:frontend,
            constexpr
      </td>
    </tr>

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

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

<pre>
    https://godbo.lt/z/j1hG1YYqK

`constexpr int x = []{ __noop; return 0; }();`
flags: `-fms-extensions`

```
<source>:1:15: error: constexpr variable 'x' must be initialized by a constant expression
    1 | constexpr int x = []{ __noop; return 0; }();
      |               ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
<source>:1:23: note: subexpression not valid in a constant expression
    1 | constexpr int x = []{ __noop; return 0; }();
      |                       ^~~~~~
<source>:1:19: note: in call to '[] {
    __noop();
    return 0;
}.operator()()'
    1 | constexpr int x = []{ __noop; return 0; }();
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
Compiler returned: 1
```
</pre>
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