[ELSE] [DEFINED] [IF]
[ELSE] ( -- )  
immediate ansi 15.6.2.2531 <TOOLS>
eat up everything upto and including the next [THEN]. count nested [IF] ... [THEN] constructs. see [IF] 
 this word provides a simple pre-compiler mechanism

reference: p4_bracket_else in ../src/toolkit.c:0321, export CI [ELSE]