the flag ``-Wunsafe-buffer-usage`` is enabled.
- ``__declspec`` attributes can now be used together with the using keyword. Before
the attributes on ``__declspec`` was ignored, while now it will be forwarded to the
- point where the alias is used.
+ point where the alias is used. Note, some incorrect uses of ``__declspec`` on a
+ ``using`` declaration were being silently ignored and will now be appropriately
+ diagnosed as ignoring the attribute.
- Introduced a new ``USR`` (unified symbol resolution) clause inside of the
existing ``__attribute__((external_source_symbol))`` attribute. Clang's indexer
uses the optional USR value when indexing Clang's AST. This value is expected