[clang] [clang] require template arg list after template kw (PR #80801)

[via cfe-commits]

================
@@ -251,6 +251,9 @@ Resolutions to C++ Defect Reports
 - P0522 implementation is enabled by default in all language versions, and
   provisional wording for CWG2398 is implemented.
 
+- Require a template argument list after a template keyword.
----------------
cor3ntin wrote:

```suggestion
- Clang now requires a template argument list after a template keyword.
```

https://github.com/llvm/llvm-project/pull/80801