phobos commit, revision 1978


user: dsimcha

msg:
Add at!() for std.typecons.Tuple to mitigate breakage of old code that depended on the Proxy struct from std.range.Zip.  Intentionally lacking ddoc since this is purely a backwards compatibility hack that IMHO should be deprecated or removed entirely eventually.

http://www.dsource.org/projects/phobos/changeset/1978