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Since C# 5.0, async and await are contextual keywords.
Contextual keywords do have a particular meaning in some contexts, but can still be used as variable names for example.
Keywords, on the other hand, are always reserved, and therefore are not valid variable names.
To avoid any confusion though, it is best to not use async and await as identifiers.


The following code:

int await = 42;         // Non-Compliant


should be refactored into:

int someOtherName = 42; // Compliant