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 <tmj9...@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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