class RuboCop::Cop::Style::TrailingCommaInBlockArgs

def argument_tokens(node)
  tokens = processed_source.tokens_within(node)
  pipes = tokens.select { |token| token.type == :tPIPE }
  begin_pos, end_pos = pipes.map { |pipe| tokens.index(pipe) }
  tokens[begin_pos + 1..end_pos - 1]
end