[Grace-core] Collections InKim, terfaces

[Andrew P. Black]

On 20 Nov 2012, at 18:26 , Kim Bruce wrote:

> I didn't add them to the repository because I was trying to make them into legal Grace.  Of course that resulted in finding several Grace errors.  The original text is in newstructures.grace, while my attempts to clean up the first part are in test.grace.  I believe Michael has now cleared up the errors I discovered (all having to do with type parameters), so the code in test.grace might actually compile.
> 

I just committed them in GraceCollections/Types.  They type-check!

	Andrew