class RuboCop::Cop::Lint::EnsureReturn

end
do_something_else
ensure
do_something
begin
# good
@example
end
return
do_something_else
ensure
do_something
begin
# bad
@example
This cop checks for return from an ensure block.

def on_ensure(node) 

def on_ensure(node)
  ensure_body = node.body
  return unless ensure_body
  ensure_body.each_node(:return) do |return_node|
    add_offense(return_node)
  end
end