internal. used by CASE
#IF (!s=0) // Mon 04-23-1990
#CHECK "CASE BREAK" ""
#ELSE
#IFDEF Case$Begin$!s
#IFSAME !2 BEGIN
Goto Begin$!s
#ELSE
Goto End$!s
#ENDIF
#ELSE
#SET S$ (!s-1)
Case$Break !1 !2
#ENDIF
#ENDIF