For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.
warning C28302: For C++ reference-parameter <parameter_name>, an extra
_Deref_ operator was found on <annotation>.
This warning is reported when an extra level of
_Deref_ is used on a parameter.
SAL2 does not require the use of an extra level of
_Deref_ when dealing with reference parameters. This particular annotation is unambiguous and is interpreted correctly, but should be corrected.
Frequently this can be corrected by simply removing the older
__deref annotation and using SAL2 syntax. Sometimes may be necessary to use
_At_ to reference the specific object to be annotated.