Great! Thanks for the discussion.
Best,
Jordan
> On Jan 19, 2015, at 5:41 AM, Alexander D. Knauth <alexan...@knauth.org> wrote:
>
> I managed to fix this for your example by inserting these 3 lines into
> typed-racket/types/remove-intersect.rkt after line 67:
> [(list-no-order (Value: (not (? hash?)))
> (or (? Hashtable?) (? HashtableTop?)))
> #f]
> There is probably a better solution though.
>
>> On Jan 19, 2015, at 7:36 AM, Alexander D. Knauth <alexan...@knauth.org>
>> wrote:
>>
>> Since hash-tables can be mutable as far as TR knows, (HashTable Symbol
>> String) is not a subtype of (HashTable Symbol JSExpr).
>> To work around this, you can do this:
>> #lang typed/racket/base
>> (require typed/json)
>> (: jsx JSExpr) ; <-- jsx is what I ultimately want.
>> (define jsx (ann #hasheq((a . "val1") (b . "val2") (c . "val3")) (HashTable
>> Symbol JSExpr)))
>>
>> Or this would work too:
>> #lang typed/racket/base
>> (require typed/json)
>> (: jsx (HashTable Symbol JSExpr)) ; <-- jsx is what I ultimately want.
>> (define jsx #hasheq((a . "val1") (b . "val2") (c . "val3")))
>>
>> Or you could use (inst make-immutable-hasheq Symbol JSExpr) instead of using
>> #hasheq, and it would do the same thing.
>>
>>
>>> On Jan 19, 2015, at 1:28 AM, Jordan Johnson <j...@fellowhuman.com> wrote:
>>>
>>> Hi all,
>>>
>>> I’ve been trying to create JSExprs, as defined in the typed/json library.
>>> This is one of those instances where it seems like I must be making things
>>> harder than they should be, but I’m still feeling like a duck on
>>> rollerskates in TR, so I want to make sure I’m not missing an easier way to
>>> do it.
>>>
>>> Would you please confirm if this is indeed a smallest-possible solution?
>>>
>>> ;;;; begin
>>> #lang typed/racket/base
>>>
>>> (require typed/json)
>>>
>>> (: jsx JSExpr) ; <-- jsx is what I ultimately want.
>>>
>>> ;; Attempt #1:
>>> #;
>>> (define jsx #hasheq((a . "val1") (b . "val2") (c . "val3")))
>>>
>>> #| Resulting error:
>>> Type Checker: type mismatch
>>> expected: JSExpr
>>> given: (HashTable Symbol String)
>>>
>>> [This seems weird, since it seems like (HashTable Symbol String) should be
>>> a subtype of JSExpr. Is the problem that the typechecker can’t recognize
>>> the Strings as JSExprs?]
>>> |#
>>>
>>> ;; Attempt #N (shortest successful version I’ve found):
>>> (define jsx
>>> (for/hasheq : (HashTable Symbol JSExpr) ([k '(a b c)]
>>> [v '("val1" "val2" "val3")])
>>> (values k v)))
>>> ;;;; end
>>>
>>> Regards,
>>> Jordan
>>>
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