Detect unused local variables

[pnewell]

Can you help me understand how auto-remove works?

I have a sample package with a single file as an example:

let test = "unused value"

enum PlanHashMode {
  case VL0
  case VC0
  case VC1

  var numericVersion: Int32 {
    switch self {
    case .VL0:
      let kind: String = "LEGACY"
      let numericVersion: Int32 = 0
      return numericVersion
    case .VC0:
      let kind: String = "FOR_CONTINUATION"
      let numericVersion: Int32 = 0
      return numericVersion
    case .VC1:
      let kind: String = "FOR_CONTINUATION"
      let numericVersion: Int32 = 1
      return numericVersion
    }
  }
}

Ideally I'd like line 1 and and the declarations of let kind: String = in each case to be removed. Right now, only line 1 is even detected, but it seems like it doesn't get removed.