Arrows syntax supports Arrow, ArrowChoice(if, case etc.) and ArrowLoop(rec) - but not ArrowApplicable. Therefore it is not possible to write:
proc x -> do
a <- someArrow -< x
a -< x
but
proc x -> do
a <- someArrow -< x
app -< (a, x)
and
proc x -> do
a <- someArrow -< x
app -< (otherArrow a, x)
instead of
proc x -> do
a <- someArrow -< x
otherArrow a -< x
Such approach adds some syntax sugar but without adding any additional
keyword and IMHO it can simplify writing ArrowApply (especially Kleisli
IO).
Regards
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