Filing an internal error caused by indexing into an integer type

This test was sent by Chris Wailes to chapel-developers on
Apr 22, 2014 and, from what I can see, was never filed against
the testing system.  The error message proposed here is just a
placeholder.  I'm open to other        sufficiently clear user  (rather
than internal) messages   as well.
Fleshing out .future
Merge pull request #1055 from bradcray/index-int-future

Filing an internal error caused by indexing into an integer type

This test was sent by Chris Wailes to chapel-developers on
Apr 22, 2014 and, from what I can see, was never filed against
the testing system.  The error message proposed here is just a
placeholder.  I'm open to other	sufficiently clear user	(rather
than internal) messages	as well.