rspec/rspec-core — pull request #763 by zubin (2012-12-30 08:20:21+00:00)
Title: Updated #let! spec to assert before block gets called

The existing specs still pass when the before block code is commented out like so:

def let!(name, &block)
let(name, &block)
# before { __send__(name) }
end

Noticed this when writing #subject! method.