ZP_LOCALS .SET $200 ;Start of free zero page memory
.MACRO LOCAL arg
    .DEFINE arg ZP_LOCALS
    ZP_LOCALS .SET ZP_LOCALS+1
.ENDMACRO

start:
    LOCAL i
    LOCAL j
    LDA #5
    STA i   ;WRONG!
    ;i is replaced with "ZP_LOCALS" ($202) rather than $200, the value at expansion
    STA j   ;WRONG
    ;i is replaced with "ZP_LOCALS" ($202) rather than $201, the value at expansion