<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63875>63875</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            libclang not traversing all nodes in some cases
        </td>
    </tr>

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

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

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

<pre>
    Hi, I am running into an issue where a cursor's descendants change when I have an `#include <utility>` at the top vs. when I don't. Here is a minimally reproducible example:

```python
import clang.cindex

clang.cindex.Config.set_library_file("...")


args = '-x c++ --std=c++11'.split()
index = clang.cindex.Index.create()
tu = index.parse("main.h", args=args)

def visit_children(node):
 node_file_name = str(node.location.file)
  if "main.h" in node_file_name:
    print(node.spelling, node.displayname, node.kind, node.get_usr())
  for c in node.get_children():
 visit_children(c)

visit_children(tu.cursor)
```

Without `#include <utility>` in `main.h`
```cpp
template <typename L>
using Single = L;
Single<int> testFn();
```

and 

With `#include <utility>` in `main.h`
```cpp
template <typename L>
using Single = L;
Single<int> testFn();
```

When `#include <utility>` isn't in the CPP file, this is the output of the Python script:
```
Single Single CursorKind.TYPE_ALIAS_TEMPLATE_DECL c:@Single
L L CursorKind.TEMPLATE_TYPE_PARAMETER c:main.h@29
Single Single CursorKind.TYPE_ALIAS_DECL c:@Single
L L CursorKind.TYPE_REF 
testFn testFn() CursorKind.FUNCTION_DECL c:@F@testFn#
```

When `#include <utility>` is in the CPP file, this is the output of the Python script:
```
Single Single CursorKind.TYPE_ALIAS_TEMPLATE_DECL c:@Single
L L CursorKind.TEMPLATE_TYPE_PARAMETER c:main.h@10
Single Single CursorKind.TYPE_ALIAS_DECL c:@Single
L L CursorKind.TYPE_REF 
testFn testFn() CursorKind.FUNCTION_DECL c:@F@testFn#
Single Single CursorKind.TEMPLATE_REF 
```

Notice that in the second output, the last line includes `Single Single CursorKind.TEMPLATE_REF` whereas, in the first output, this line does not exist. Is this a bug? If not, why is this happening?
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzcVk2P2zYT_jX0ZbCCTNqWffBh1x-I8Tp5jWSLoCeDJmlpEooUSGqz_vcFKWnX3rRNih6KFjAkaDjzzDMfHA_3Hkuj1JJMH8h0PeJtqKxbfm0N11_4RSrPcXSy8rJ8h4SuYAe8Btcag6YENMECN4Detwq-Vcop4CBa560jtPAglRfKSG6CB1FxUyYtAzuo-JOKpmSWE8rQCN1KBYSt2oAaw4WwDZnlwAOESkGwDTz5bDCW1hBahAzeRY_ogUONBmuu9QWcapyVrcCTVqCeed1oRdg9ydckH56zvPs1l1BZ0wmxbqwLIDQ3ZSbQSPV8bXMtz1bWnLHMvApHjSfH3eV4Rq0InRNKsywjlBK6uHGZntyVHghbA6HF3TMIQh8IfYC7Ox8kYev-ezwmtMh8ozEkxB4ouU7WN1x26Smc4kFdq4c26XZKDXe-p1dzNFmVGK4gEiJsnV63hKU6wxN6DEdRoZZOGULnxkoV9YZ0QhSk0I-G1yo59MH1mpm2gge0JuuS0-MD4BmuiQCaN0CvDgCgcWjCAOkbpTWaMpJPAom-0fySrAbZVzTy5aNU4dh616fmlcTZOhCD66R1FehNkN-lQbzJ1XcKoc2GW7B403LXdp8xVLYNP7oEmK5Jn64XhAFQNE1fcFU3mocEEC6NShXZR4x03Pp4ZT-hKXVXqD1hD91RJyRsFRPNNhCUD9uXNDz8SQTcSHgb0b84nM9xvvyIvk_DJ4YRR9PqcICuvVcQKvRxHEW5bUPTBrDn9HVIgwa8cNiE12l0y6EPpn-tUgP9D43MHn89bI73-939p-Pj5v1hf_-4Oa43qz2ICDXJ-4ATyB72N6aDfsI43H-8f7953HxMln0JJvnQpD9D4Gf9RouPmy0MxYwluKnEtfb2lw-rx93_P9ygb8kkHwzY3y7af6le479A4B-t1x8THMJ8dfm7tf1gAwoFoeIvF84rYY3s69VVUYHmPoBGo6BvAR874qfcx_ZIqwv3Ea33ckbnw40T9J0DaZUHYwOoZ_Qhg53vDjmc2pKwLezO8TgafasuXXuhh4o3jYpbE2HbkVwyuWALPlLL8Wy-YLNZwdioWubzk8zFqWDj82I-VUXB2JxNioUscjkTUoxwSXPK8mI8oTmjY5YtmJRsriZUFlJOJ1MyyVXNUWdaP9WZdeUoLWfLGZsX05HmJ6V92vUoNepbt7nFXWC6HrlltLk7taUnk1yjD_4VJWDQaqnxlHaPFH9w_Em5NIa51ulvNN0yb2sFgnvlR63TyyqExscOoVtCtyWGqj1lwtaEbiN6_7prnP2iRCB0mzh5QreJ828BAAD__-LRPdc">