chickadee » coerce » coerce-composite-extension!

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.