[Haskell-beginners] Structural restrictions in type constructor

[emacstheviking]

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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