Revert until parse_ty fixes makes it into nightly.

Revert "Merge pull request #51 from jauhien/fix-parse_ty"

This reverts commit e49741104573ef43b791ea3a2d790e6a0cae4217, reversing
changes made to 06fbbf1ee93dbf9983e2e4b8c9121b0ae0ae24a0.
removed :d format specifier