rails/rails — pull request #9565 by kennyj (2013-03-05 15:43:27+00:00)
Title: Remove unused return value, because collecting_queries_for_explain isn't public API.

`ActiveRecord::Explain.collecting_queries_for_explain` isn't public API, and this method is used only once.
In master, the first of this method's return value is not used.

```
_, queries = collecting_queries_for_explain { exec_queries }
```

I think we should remove this return value.