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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