class RuboCop::Cop::Style::StringConcatenation

def line_end_concatenation?(node)
  # If the concatenation happens at the end of the line,
  # and both the receiver and argument are strings, allow
  # `Style/LineEndConcatenation` to handle it instead.
  node.receiver.str_type? &&
    node.first_argument.str_type? &&
    node.multiline? &&
    node.source =~ /\+\s*\n/
end