[racket] TR: Polymorphic types

I've added an example of this to the documentation.

Sam
On Sat Jan 17 2015 at 9:48:36 PM Matthias Felleisen <matthias at ccs.neu.edu>
wrote:

>
> On Jan 17, 2015, at 9:32 PM, Sam Tobin-Hochstadt wrote:
>
> > No, it can't be adapted. That error message is an instance of this
> > caveat: http://docs.racket-lang.org/ts-guide/caveats.html#%28part.
> _.Typed-untyped_interaction_and_contract_generation%29
> > which applies to `define-predicate` as well. There's no way to check
> > if something is a `Foo`, because Typed Racket wouldn't know what you
> > meant for `A` to be.
>
>
> I think the section [title] is misleading here. You need to know
> TR's ideas well to see that the generation of a run-time object
> is the same thing as moving from the typed to the untyped world
> (and vice versa).
>
> Perhaps an example like Jordan's could be included in the docs.
>
> -- Matthias
>
>
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