(Sorry if this has reached PICLIST already, I posted it before but saw no
responses)

I have this small and completely useless file, which shows a strange MPASM
behaviour I stumbled upon while writing a generic RS232 receive macro.

        list p=16c84
wrong   macro
                error something wrong
        endm
test    macro
        local x,y
        if y - x != 1
                error strange #v(y) #v(x)
                wrong ; try to remove
        endif
x       nop
y
        endm
        test ; try to remove
        test
        end

When I assemble its I get

Error[101]   C:\USERS\DEFAULT\16C84\TRY.ASM 9 : ERROR: (strange 0 0)
Error[101]   C:\USERS\DEFAULT\16C84\TRY.ASM 4 : ERROR: (something wrong)

This is caused by the fact that in pass one all forward labels have the
value 0.
Indeed the errors disappear when I change the test to y - x != 1 && y - x != 0.

But when I remove either one "test" macro call, or the "wrong" macro
call both errors disappear! Is this an MPASM bug or can someone explain this?