[Haskell-beginners] Structural restrictions in type constructor

[Matt Williams]

OK, I think this is clearly well beyond my level!

Will insert some manual checking.

Thanks,
Matt

On 22 June 2015 at 14:51, emacstheviking <objitsu at gmail.com> wrote:

> It *could* be done and might already have been done... I seem to recall a
> few months back somebody asked for a similar feature using one of the
> vector libraries, to limit one of the input vectors to a fixed length?
>
> You'd have to dig through the list archives though...
>
> On 22 June 2015 at 12:36, Imants Cekusins <imantc at gmail.com> wrote:
>
>> > But this is checking the values in the implementation, not a type level
>> build time guarantee, isn't it?
>>
>> yep, correct. Could be caught by unit tests though :-P
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