One remnant from the previous design iteration is the current behavior of the next-line modifier `:`. Currently, `:` is allowed on the per-tag as opposed to per-line basis. For example:

// @tag1 : @tag2
// @tag1 : @tag2 :
// @tag1 @tag2 :

So, currently, *each* tag on a line can apply either to the same line or the next line. However, JEP 413 defines that the `:` modifier should only work on the per-line basis: either all tags apply to the next line or none of them.