Is it possible to get a warning if return value is not used?

Question

I have an extension method which returns a value. In this case, it should set a specific bit in a byte:

public static byte SetBit(this byte b, int bitNumber,          


        

Answer 1

There seems to be a Nuget Package for ReSharper Annotations.

This includes a MustUseReturnValueAttribute:

[MustUseReturnValue("Use the return value to...")]
public byte Foo()
{    
}

As @Kirk Woll pointed out in the comments, it is also possible to write a custom Roslyn Analyzer.