class RuboCop::Cop::Style::MultilineOperationIndentation

def operation_description(node)
  ancestor = kw_node_with_special_indentation(node)
  if ancestor
    kw = ancestor.loc.keyword.source
    kind = kw == 'for' ? 'collection' : 'condition'
    article = kw =~ /^[iu]/ ? 'an' : 'a'
    "a #{kind} in #{article} `#{kw}` statement"
  else
    'an expression' + (assignment_rhs?(node) ? ' in an assignment' : '')
  end
end