- coerce-composite-extension! TYPE-TAG TYPE-PRED CONVERTORprocedure
Extends the domain of an existing coerce extension.
TYPE-TAG, TYPE-PRED, and CONVERTOR are as for extend-coerce.
The new CONVERTOR is try'ed before the existing procedure, then the existing procedure is try'ed "on-error".
Should the new TYPE-PRED and existing TYPE-PRED be eq? the TYPE-PREDs are not "composited" using or.