<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/136435>136435</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang_equalCursors not work as expect
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          neko-para
      </td>
    </tr>
</table>

<pre>
    I'm using my own nodejs binding of libclang to parse my source to generate a simplified ast.

```typescript
// dfs logic, using cursors as a stack
function parseAnnotate(tu: CTranslationUnit) {
 const root = tu.cursor
    const cursors: CCursor[] = [root]
 tu.cursor.visitChildren((cursor, parent) => {
        while (cursors.length > 0 && !cursors[0].equal(parent)) {
            cursors.shift()
        }
 if (cursors.length === 0) {
            console.warn('jump out root', cursor, parent)
        }
        cursors.unshift(cursor)

 console.log('  '.repeat(cursors.length - 2), cursor.spelling, cursor.kindStr)
        return CXChildVisitResult.Recurse
 })
}
```

The code above works quite well, but when parsing the code below, the cursors that should be equal become different.

```
 _Const_lvalue_cond_oper ClassTemplatePartialSpecialization
       _Ty1 TemplateTypeParameter
       _Ty2 TemplateTypeParameter
 RequiresExpr
> Here should be a TemplateRef with parent of RequiresExpr, but my program crashed
```


https://github.com/microsoft/STL/blob/5762e6bcaf7f5f8b5dba0a9aabf0acbd0e335e80/stl/inc/type_traits#L1288

**After dumping the CXCursor data, it shows that the parent.data[0] is non-zero, while cursors[0].data[0] (previously stored one) is zero, causing clang_equalCursors return false.**

I think there should be some problem either on my binding code or the way I use libclang, but I'm not sure.
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJx8VUtv2zoT_TX0ZmBBpl72wovEqfEF6OJDmnvRnTGiRhYbilT5iOv--gvq4SZ9CQQSk2eGZ4ZnZtA5edZEe1bcs-JhhcF3xu41vZj1gBZXtWmu-0fGqx6Ck_oM_RXMRYM2DX1xUEvdxF3TgpK1UKjP4A0MaB1FqDPBCopbZ9Jk0RMgONkPSraSGkDnE5bexVWm0_LXgZywcvBxlx8ZP0LTOlDmLAXjh5mHCNYZ6wBd9OhRvLD0rg1aeGn0ROBOa-PRE-NbH1h2B4dni9opjJB_tPSM74BV9yy9A2G082CN8cCyB_AhmS6IZwDz8Xzn6OowHY9pG01YcR_NWfEQbW4OklfppD90UjWWNONbxreza36IPElPPLIHln1Y6MzfpZOK4GbhEkX67DuIyBQYLxkvgfHNQqy4T1nxkNDXgIrx7c37m0DffItT18nWj8x2bxCsGgOR7W_vf5gWpH9wbbQzipIL2inm6kvoBzBhyjHjVYz-N3n4lcBPZINe6C7Wu0lAtzuVOU9XAjBeJZYGQv9rDGvgY2YWGokbSCmpz2-2XqRuPnn7npclH6yGw-fxUf-Nz_tELiifPFG0o4iN5CdmYxQ3dU9cnzsCYRoCrM0rwcXYFwdfg_QEF1IqMqiDh0tHk5Sj4P1iU5MylwgZd-Yy8B16cJ0JqoGaYFQA1CRMT9DItqWY359LLRI9HaK0T-oVVaCTMLo5mYEsHBQ690z9oNDT_9F6ierTQEKikt_HCvqRktPzdQML9vk6RDz25Mm-w_A_Y57oa5CW3IdvQ_wd9f0_svQmIrwZP1ELF-m7WTSx97wzn5PXX2Gw5myxB2HRddT8-g6Mb1hx_9jjmWLd8m3n_RDre-o7Z-m7UCfC9IwfgyO7Ru9RdD1p7xg_onM0_tNWxIlKvi42Na7zfNesdxm261LkTS6KMst5fhPqX-7opbDGmSjv46fnj4wfa2Vqxo9FVXIqa4Ft1Rbtti6aGlPcIdZtiqJuUsqygrYp40fnFeNHqQXjx9hLT96ijCyzjxu-3S6Bx3XXerLQhH5YBHb4PPU1aNBjzKQcVXWZBRYhU9aTETD1G5AOtNHr72RNtJm61k896S0-tiZLr9IEp67gvLHUgNEUe4l0sPgROLf6OFZOo6QPs9znGmxROUqmYKbAHsF3Ur9Epu_k42IhDNbUinogGY_B6CiSZYSNtWXsGOMFr_AIwdFtqi2qmkahNh5csJSsmn3W7LIdrmi_qfIirfKcl6tun26bRmzzrGo41m1b4q7dVWld8bwoi1LkK7nnKS_SfLPb5EWWl8kmLdqqaAixLqo6FSxPqUepEqVe-8TY80o6F2i_yco8K1YKa1JunNuca7rAeMo4j2Pc7qPRug5nx_JUSefdDzdeekX73yQ1RhVbUZyp9G0g4VfBqv1f9Bp9zn_WgzVfSETljkxiWcxUX_f8vwAAAP__pG2vvw">