Remove unused attribute.
Revert the revert.

This brings @jauhien's fix in #51 back.

Revert "Revert until parse_ty fixes makes it into nightly."

This reverts commit d895e5d782b5f0f9e4b9f12fe0472478c39efe69.
quote_ty is broken for now, so do things by hand. :-(

See #51.
0.6.11