class RuboCop::Cop::Performance::RedundantBlockCall

end
yield 1, 2, 3
def another
end
yield
def method
@good
end
func.call 1, 2, 3
def another(&func)
end
block.call
def method(&block)
@bad
@example
where ‘yield` would do just as well.
This cop identifies the use of a `&block` parameter and `block.call`

def autocorrect(node)

offenses are registered on the `block.call` nodes 
def autocorrect(node)
  _receiver, _method, *args = *node
  new_source = String.new(YIELD)
  unless args.empty?
    new_source += if parentheses?(node)
                    OPEN_PAREN
                  else
                    SPACE
                  end
    new_source << args.map(&:source).join(', ')
  end
  new_source << CLOSE_PAREN if parentheses?(node)
  ->(corrector) { corrector.replace(node.source_range, new_source) }
end

def on_def(node) 

def on_def(node)
  blockarg_def(node) do |argname, body|
    next unless body
    blockarg_calls(body, argname) do |blockcall|
      add_offense(blockcall, :expression, format(MSG, argname))
    end
  end
end