class RuboCop::Cop::Style::Documentation

def nodoc_comment?(node, ast_with_comments, require_all = false)

parser-2.2.0.4.
Note: How end-of-line comments are associated with code changed in
proceeds to check its ancestors for :nodoc: all.
class/module. Unless the element is tagged with :nodoc:, the search
First checks if the :nodoc: comment is associated with the 
def nodoc_comment?(node, ast_with_comments, require_all = false)
  return false unless node
  nodoc_node = node.children.first
  return false unless nodoc_node
  comment = ast_with_comments[nodoc_node].first
  if comment && comment.loc.line == node.loc.line
    regex = /^#\s*:nodoc:#{"\s+all\s*$" if require_all}/
    return true if comment.text =~ regex
  end
  nodoc_comment?(node.ancestors.first, ast_with_comments, true)
end