I think that racket threading macros can mix with expressions(lambda,
curry, class, ...), but not in fact.
(define (add2 x) (+ x 2))
(~> 1 add2) ; ok
(~> 1 (lambda (x) (+ x 2))) ; ng
(~> 1 (curry + 2)) ; ng
(define/public (incr) (lambda (y) (+ x y)))))
(define adder (new adder% [x 2]))
(send adder incr) ; ok
(~> 1 (send adder incr)) ; ng
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