<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/77599>77599</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            CTAD for aggregates fails for inner template class
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            c++20,
            clang:frontend
      </td>
    </tr>

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

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

<pre>
    The following code is compiled for gcc and msvc, but clang fails to [compile](https://godbolt.org/z/P1jzvfWx1):

```
template<typename T>
struct Foo {
  template<typename X>
  struct Inner {
    T t;
    X x;
  };
};

void s() {
  Foo<int>::Inner i{1, 2}; // fails 
  Foo<int>::Inner i2 = {1, 2}; // fails
}
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJyEUk1vozAQ_TXDZdTIjMPXgUMSFmlve4i0vRozEHcNjrDJtv31K0japqvVVkKGN-Y9zzw_5b3pR-YSkj0kVaTmcHJTeXK_2IxR49qX8nhi7Jy17rcZe9SuZTQetRvOxnKLnZuw1xrV2OLgLxrogM0cUFs19tgpYz0Gh5DsbxRIKqD8FMLZg9wB1UB179rG2bBxUw9UvwLVP-Kn10v38zkGKpbfRAXibU3F7Vlh4OFsVWCQh_By5lENjEeQ3667PkyzDlg7h5DtrzXEf3Ee3zmIN9b3ceTpnod4xADyDj_i8x2GrHpHn77X9eJMix4oByruVWvnQB7MGJYO5A7k7nqwgWwfL37SVQuvZt1M_ZJNCLLC_2l8NPrZ2KgtZVvIQkVcxpnY5gWJPI9OZZGmskvyuEvaJNGstO6UKIpOp4LzRlNkShK0FXEsYilysd3INOc24VRlTZtQk8JW8KCM3Vh7GZb7joz3M5dZlhRFZFXD1q9hJNJAe6A9CSACOiyVJVMgd93kxsBju2wkVTSVi9hDM_cetsIaH_yHfDDBcnk47qo1qqrvJ-5VYH-zcSma1bC3UCzR9T6aJ1v-lVITTnOz0W4AqpcDbq-H8-SeWAegeh3GA9XrPH8CAAD__35g-vM">