It's unknown if "fallthrough" can be used for its intended purpose

[CTMacUser]

Looking at the rules, specifically the (non-)triggering examples for fallthrough, it's not clear if:

switch myInt {
case 2:
    myResult += 1
    fallthrough
case 1:
    myResult += 1
default:
    return 0
}

is a non-triggering case or not. (It shouldn't be. And I need to file a new issue if it is, unless issue #2194 already covered it.)

[marcelofabri]

fallthrough is now optional and completely forbids fallthrough. You may want to look at fallthrough_only which validates the behavior you want.

[CTMacUser]

fallthrough is now optional and completely forbids fallthrough. You may want to look at fallthrough_only which validates the behavior you want.

I was about to respond that I read more of the file and saw the "No Fallthrough Only" rule. Sorry.