message: Fix type error when calling lines.slice.
diff: @@ -268,7 +268,7 @@ function printLeadingComment(commentPath: any, print: any) {
  } else if (lines instanceof Lines) {
  var trailingSpace = lines.slice(
  loc.end,
  - lines.skipSpaces(loc.end)
  + lines.skipSpaces(loc.end) || lines.lastPos(),
  );
  if (trailingSpace.length === 1) {
  