class Rubocop::Cop::Style::DefWithoutParentheses

class/singleton methods are checked.
method, that takes arguments. Both instance and
This cop checks for missing parentheses in the definition of a

def on_def(node) 

def on_def(node)
  _, args = *node
  if args.children.size > 0 && args.loc.begin.nil?
    add_offence(:convention, args.loc.expression, MSG)
  end
  super
end

def on_defs(node) 

def on_defs(node)
  _, _, args = *node
  if args.children.size > 0 && args.loc.begin.nil?
    add_offence(:convention, args.loc.expression, MSG)
  end
  super
end