#74 64tass will assemble `lda #$` as `lda #$00`

[Tom Seddon]

Repro steps:

1. assemble attached file with something like 64tass -o cmpim.prg cmpim.s65
2. note file builds without error..
3. dump output and note the a9 00

Changing lda #$ to lda # will give the expected "an expression is expected" error.

Thanks,

--Tom

[Soci/Singular]

This is because $ is an empty bit string. Similarly like "" is an empty character string or x'' an empty byte string.

The numeric value of all three are zero in expressions which need numeric values.

While it works as designed I see how an empty (bit) string is unexpected as an instruction argument. Or even elsewhere, as it's basically "nothing". Will think about it.