halp.md

Where is this Character.init(String) frame coming from?

StringUtils.swift

extension String {
  func lazyComponents(separatedBy sep: Character) -> AnySequence<String> {
    return AnySequence<String> { [cv = self.characters] () -> AnyIterator<String> in
      var current = cv.startIndex
      var finished = false
      return AnyIterator<String> {
        if finished {
          return nil
        }

        var prev = current
        while current < cv.endIndex && cv[current] != sep {
          cv.formIndex(after: &current)
        }
        defer {
          if current < cv.endIndex {
            cv.formIndex(after: &current)
          }
          else {
            finished = true
          }
        }
        return String(cv[prev..<current])
      }
    }
  }
}