Under Options, Code Analysis, General I have “Top 20” in the Default Rule Set, I have never changed this from previous versions. In 12.12 while in the Editor it would mark unused variables in a program identified by Rule ID 6405, "Avoid defining variables that are not referenced inside the program.’
This is an informational message I found to be very useful. This is not working for me in version 13.0.0.80.
I’m also using 13.0.0.80 and can confirm I’m experiencing the same thing – rule 6405 is not working, despite it being included in my Top 20. Do you know if it’s been fixed in 13.1? I’m currently using 12.12.0.39 in order to make use of this rule.