Maybe this line:
https://github.com/racket/racket/blob/master/racket/collects/racket/contract/private/parametric.rkt#L105
should be:
#:first-order (λ (c) (if (barrier-contract-positive? c)
(barrier-contract-pred c) (λ (x) #t)))
?
Robby
On Tue, Nov 28, 2017 at 8:02 PM, Ben Greenman
The other day, I wanted to write a contract for a function that takes
any kind of vector and does something depending on whether the vector
is mutable. The contract was basically the one below:
```
#lang racket
(define/contract (f v)
(parametric->/c [A]
(-> (or/c (vectorof A #:immutable
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