rspec/rspec-core — pull request #1108 by myronmarston (2013-10-11 06:27:36+00:00)
Title: Give example group classes a friendly const name.

Practically, this gives friendly error messages. Before,
an undefined message called from an example errored like:

undefined local variable or method `foo' for #

…and now it is:

undefined local variable or method `foo' for #

/cc @samphippen @soulcutter @xaviershay @JonRowe @dchelimsky @alindeman