8080 assembler: Forward reference of EQU doesn't work

[vbmacher]

E.g.

LXI	SP,STACK

TEMPP:	DW	TEMP0	;POINTER USED TO TEST "LHLD","SHLD",
			; AND "LDAX" INSTRUCTIONS
;
TEMP0:	DS	1	;TEMPORARY STORAGE FOR CPU TEST MEMORY LOCATIONS
TEMP1:	DS	1	;TEMPORARY STORAGE FOR CPU TEST MEMORY LOCATIONS
TEMP2:	DS	1	;TEMPORARY STORAGE FOR CPU TEST MEMORY LOCATIONS
TEMP3:	DS	1	;TEMPORARY STORAGE FOR CPU TEST MEMORY LOCATIONS
TEMP4:	DS	1	;TEMPORARY STORAGE FOR CPU TEST MEMORY LOCATIONS
SAVSTK:	DS	2	;TEMPORARY STACK-POINTER STORAGE LOCATION


STACK EQU TEMPP+256 ;DE-BUG STACK POINTER STORAGE AREA

Shows error:

Compiling started...
[Info   ] Intel 8080 Assembler, version 0.41-SNAPSHOT
[Error  ] Compilation error: Unknown identifier: STACK
Compiling has finished.