rspec/rspec-core — pull request #1763 by myronmarston (2014-11-05 00:06:40+00:00)
Title: Improve shared group backtrace in failure output.

- Show all shared group inclusion stack frames,
not just the inner-most one.
- Make it work for all methods of including
shared example groups. Previously, it only
worked for the methods that generate a nested
group.

Fixes #1209.