[jhc] darcs patch: fix deriving rules for read/show when it... (and 1 more)

Sun Feb 19 20:43:22 PST 2012 John Meacham <john@repetae.net> * fix deriving rules for read/show when it comes to labels Sun Feb 19 21:06:16 PST 2012 John Meacham <john@repetae.net> * add prototype for gc_alloc