sdkrystian wrote:
This does seem to cause an error in libstdc++:
```
include/c++/11/bits/shared_ptr.h:365:10: error: use 'template' keyword to treat
'__shared_ptr' as a dependent template name
this->__shared_ptr<_Tp>::operator=(__r);
^
```
Since `this` is dependent (it's of type `shared_ptr<T>*`) and `shared_ptr`
inherits from `__shared_ptr<T>` (i.e. it has a dependent base), `template` is
required to treat `<` as the start of a template argument list. I think we can
detect these cases and diagnose this as a language extension.
https://github.com/llvm/llvm-project/pull/92957
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