privat/nit — pull request #486 by xymus (2014-06-10 15:10:22+00:00)
Title: nitg: add support for unary - as an extern method

Fixes #483.

TODO: Since "unary -" is an overload of "-", it cannot be declared as a callback from C. We could either extend the importation syntax or import both "-" and "unary -" on import of "-".