op: refactor do handling.

* stdlib/op.tl (op-expand): The logic involving the multiple
expansions of do is consolidated into one step, so that
everything is taken care of by the time syntax-1 is produced.
Immediately when the initial unsuffixed arguments expand
successfully, we check or the presence of metas and add the @1
if metas are absent. In the case of expanding with the gensym,
we immediately replace that with @1 without using symacrolet.
The do-gen variable is gone.  Later, when calculating
lambda-interior, there are no hacky additional passes to deal
with; that block of code just refers to syntax-2. The do case
is folded together with the have-metas case. Also adding
copious comments to this hard-to-follow logic.

0 files changed, 0 insertions, 0 deletions