rspec/rspec-rails — pull request #935 by yujinakayama (2014-02-17 11:42:29+00:00)
Title: Require `rspec/collection_matchers` by default

Currently `rspec-collection_matchers` gem is specified as a runtime dependency but it's not loaded, so `have(...).error_on(...)` fails as the following:

```
Failure/Error: it { should have(1).error_on(:name) }
NoMethodError:
undefined method `have' for #
```

I think `2-99-maintenance` branch also needs to require it to suppress the deprecation warning.