nex3/sass — pull request #242 by chriseppstein (2012-01-08 02:06:05+00:00)
Title: Extend warnings

In porting from base classes to placeholder selectors, I really needed this.

In 3.2 we will warn if a selector being extended is not found. In 3.3/4.0 it will become an error.

The warning can be silenced by placing `!optional` at the end of an `@extend statement`. This maybe useful for libraries and partial re-use.