class RuboCop::Cop::Style::Lambda

def needs_whitespace?(block_method, args, node)
  selector_end = block_method.loc.selector.end.end_pos
  block_begin  = node.loc.begin.begin_pos
  (block_begin == end_pos(args) && selector_end == begin_pos(args)) ||
    (block_begin == selector_end)
end