A declaration of a local label is indeed a number followed by a colon. But a reference to a local label needs a suffix of f
or b
, depending on whether you want to look forwards or backwards – i.e. 1f
refers to the next 1:
label in the forwards direction.
So declaring the label as 1:
is correct; but to reference it, you need to say jmp 1f
(because you are jumping forwards in this case).