## Why is this an issue?

The `... IsNot ...` syntax is more compact and more readable than the `Not ... Is ...` syntax.

### Noncompliant code example

    Module Module1
        Sub Main()
            Dim a = Not "a" Is Nothing ' Noncompliant
        End Sub
    End Module

### Compliant solution

    Module Module1
        Sub Main()
            Dim a = "a" IsNot Nothing  ' Compliant
        End Sub
    End Module