scalaz/scalaz — pull request #533 by S11001001 (2013-09-17 01:58:18+00:00)
Title: Tag.of combinators for improved inference when working with tags

Essentially by currying the tag type parameter.

`onF` is probably the most useful, for its combination with `foldMap`, but the others, taken together, should be nice substitutes for `Tag.subst` and `Tag.unsubst`. See usage examples in the added test file.