jeffreykegler/Marpa--R2 — pull request #27 by jddurand (2013-10-05 01:20:13+00:00)
Title: Make list of unproductive lexical symbols more readable

Use case is the following.
Before:

Uncaught exception from user code:
Unproductive lexical symbols: escape character character set specification simple value specification

After:
Uncaught exception from user code:
Unproductive lexical symbols: