Unexpected behavior when bindings are used in `floe` positions

[countvajhula]

Qi binding in Racket expression

flow.rkt> (~>> (odd?) (as p) (range 10) (filter p))
; /Users/siddhartha/work/lisp/racket/qi/qi-test/tests/flow.rkt:11:16: let: duplicate identifier
;   at: p
;   in: (let ((p undefined) (p undefined) (p undefined)) (qi0->racket (thread (thread (esc (λ (p2) (set! p p2))) ground) (esc ((λ (v) (λ rest (apply v 10 (append rest (list))))) (contract (->* (real?) (real? real?) any) (range->cstream-prepare (cstream-next->li...

Expected: '(1 3 5 7 9)

Also, the expansion appears to have many duplicate bindings.

Qi binding in Qi expression

flow.rkt> (~> (odd?) (as p) (range 10) △ (pass p))
; filter: contract violation
;   expected: (any/c . -> . any/c)
;   given: #<undefined>

Expected: 1, 3, 5, 7, 9

(The error message should also implicate pass rather than filter.)

Using a Qi binding as a primitive flow

flow.rkt> (~> (odd?) (as p) p)
; compose: contract violation
;   expected: procedure?
;   given: #<undefined>
;   argument position: 1st
;   other arguments...:
;    #<procedure:composed>

Expected: arity error, 0 arguments provided to odd?, same as (odd?)

Bindings used in non-floe positions

flow.rkt> (~> (odd?) (as p) (gen p))
#<procedure:odd?>

flow.rkt> (~> (5) (as p) (gen p))
5

(works as expected)