Check `respond_to` before delegation due to: https://github.com/ruby/ruby/commit/d781caaf313b8649948c107bba277e5ad7307314
Merge branch 'master' into ruby-2.2

* master:
  Revert "ask the fixture set for the sql statements"
Merge branch 'ruby-2.2'

* ruby-2.2:
  Check `respond_to` before delegation due to: https://github.com/ruby/ruby/commit/d781caaf313b8649948c107bba277e5ad7307314