AFK, but it looks like the contract and function on your define/contract
are swapped. Maybe the contract check on the one-arg call sets the
parameter and then hilarity ensues?

Eric


On Mon, Mar 23, 2020, 12:36 PM David Storrs <david.sto...@gmail.com> wrote:

> (define/contract (foo x)
>   (-> boolean? any)
>   'ok)
>
> (foo #t)
> 'ok
> (foo 7)
> ; foo: contract violation
> ;   expected: boolean?
> ;   given: 7
> ;   in: the 1st argument of
> ;       (-> boolean? any)
> ;   contract from: (function foo)
> ;   blaming: top-level
> ;    (assuming the contract is correct)
> ;   at: readline-input:4.18
> ; [,bt for context]
>
> Yup, all good.
>
>
> (define/contract foo (make-parameter #f) boolean?)
> (foo #t)
> (foo)
> #t
> (foo 7)
> #f
>
>
> This isn't what I expected.  What am I missing?
>
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