class RuboCop::Cop::Naming::MemoizedInstanceVariableName

def find_definition(node)
  # Methods can be defined in a `def` or `defs`,
  # or dynamically via a `block` node.
  node.each_ancestor(:any_def, :block).each do |ancestor|
    method_node, method_name = method_definition?(ancestor)
    return [method_node, method_name] if method_node
  end
  nil
end