frankshearar/zipr — Issue #10: Lefts are insufficiently informative
Author: frankshearar
Created: 2011-12-08 21:01:41+00:00
State: open

A Left right now simply contains an error - :left_at_leftmost, :down_at_leaf, etc. - which tells you *what* error happened, but not *where*.

Instead, return something that tells you both.