RCS1031: False positive on using + return in switch-statement

[Debbus72]

Based on code in our application, I have created the following example:

public static void Main(string[] args)
{
   switch (args[0])
   {
        default:
            { //RCS1031
                using var fs = new FileStream(@"c:\test.txt", FileMode.Open);
                return;
            }
    }
}

The following things happen in this example:

• We use the new using var ...
• We return directly from the case/default.
  Because of using var C# forces us to use the braces around the whole case-statement. Omitting the braces results in the error "CS8647 A using variable cannot be used directly within a switch section (consider using braces)." However, the rule "RCS1031- Remove unnecessary braces" is showing on those braces.

We have work-around for this, like not do a return but a break (which is just below the closing-brace). The working example (which does not show the RCS1031 rule) would be:

  default:
  {
      using var fs = new FileStream(@"c:\test2.txt", FileMode.Open);
  }
  break;

For me this is a real edge-case and frankly I quickly rewrote this to not do the return inside the switch. So see if you want/can to fix this.