Comment 5 for bug 579336

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the classic approach to solve the problem with unknown symbols because they're defined at a later time, would be to make use of forward declarations, however this is currently not possible because of the check that yields a "Redefinition error", it could work something along the lines of:

jmp start
; data
label: db 00 ; define symbol named label of word byte

; dead code:
jmp label ; -- recognized as referring to an address of type byte

; functions:
label: nop
       nop
ret

; -- entry point
start: nop

end: nop
     hlt