rspec/rspec-expectations — pull request #553 by cupakromer (2014-05-21 03:59:41+00:00)
Title: Update `errors_on` deprecation message

Special case handling for deprecation message when used with `errors_on`.

- The `errors_on` method is now provided by `rspec-collection_matchers` gem (previously from `rspec-rails`)
- Conversion from previous matcher to new methods is not straight forward if gem is not used
- Fixes rspec/rspec-rails#1026.