[spl02]
No source may be split more than once in the same place.
Affects: <split-leaf-div-at> <tok>
<split-leaf-div-at>
<tok>
Used by template ŧ segment-tokd-prepped-class-1 ŧ TAN-A-div-errors
ŧ segment-tokd-prepped-class-1
ŧ TAN-A-div-errors