You need to select the "Patsopt2js" button when using Try-ATS-on-line to
get the error I posted. I'll test using my local ATS installation to
determine whether this is only on the JS version of ATS or not.
On Monday, November 29, 2021 at 10:23:56 AM UTC-5 gmhwxi wrote:
> Is there a way for me to generate the error you are referring to?
> The above code works fine on my end.
>
> --Hongwei
>
>
> On Mon, Nov 29, 2021 at 10:16 AM d4v3y_5c0n3s <tmj...@gmail.com> wrote:
>
>> I think I've been able to break down a problem I've been having with ATS'
>> templates into a simple example provided below. The following code
>> type-checks, and can easily tested using Try-ATS-on-line.
>>
>>
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>>
>> *datavtype maybe(a:vt@ype) =| NAH of ()| YAH of (a)fn{a:vt@ype} maybe_nah
>> () : maybe(a) = NAH()fn{a:vt@ype} maybe_yah ( x: a ) : maybe(a) =
>> YAH(x)implement main0 () = let var m1 = maybe_nah<int>() var m2 =
>> maybe_yah<int>(6) val-~NAH() = m1 val-~YAH(int) = m2inend*
>>
>> Running the above sample produces the following error:
>> ParsingErrors:
>> /tmp/patsopt_ccats_Ht1nNp: 9732(line=454, offs=1) -- 9735(line=454,
>> offs=4): error(parsing): the keyword [EOF] is needed.
>> exit(ATS): uncaught exception at run-time:
>>
>> /var/lib/openshift/5419477be0b8cddd09000122/app-root/runtime/repo/ats2-lang/contrib/CATS-parsemit/SATS/catsparse.sats:FatalErrorExn(1024)
>>
>> My question is, why is this simple example failing, and how should I fix
>> it? I know the problem is related to metaprogramming in some way, but I
>> don't understand the low-level details enough to get why this isn't
>> working. Please let me know if you have any further questions.
>>
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>>
>
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