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- For backward labels, set happens before write. For forward
- labels, write happen before set. The write operation writes a
- dummy placeholder, and then the set operation writes the offset
- at that placeholder's address.
-
- Variable actions are expected to be called with labels in
- front of them. Example, "L2 FSET"
-
- About that "1 -": z80 relative jumps record "e-2", that is,
- the offset that *counts the 2 bytes of the jump itself*.
- Because we set the label *after* the jump OP1 itself, that's 1
- byte that is taken care of. We still need to adjust by another
- byte before writing the offset.
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