[racket] Typed Racket - Parameterized Structures

Hi,

I could use an assist on getting the following to type check.

#lang typed/racket/base

(struct: (All T0 T1) Cvt ([cvt : (T0 -> T1)]))

(: cvt-apply (All (T0 T1) T0 (Cvt T0 T1) -> T1))
(define (cvt-apply value cvt)
  ((Cvt-cvt cvt) value))

(: ItoS-Convert (Cvt Integer String))
(define ItoS-Convert
  (Cvt (λ: ((x : Integer)) "Hello")))

(: ItoS (Integer -> String))
(define (ItoS int)
  (cvt-apply int ItoS-Convert))
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