class Rufo::Formatter

def visit_unary(node)
  # [:unary, :-@, [:vcall, [:@ident, "x", [1, 2]]]]
  _, op, exp = node
  consume_op_or_keyword op
  if op == :not
    consume_space(want_preserve_whitespace: true)
  else
    skip_space_or_newline
  end
  visit exp
end