class RuboCop::Cop::Style::SpaceBeforeComment

def investigate(processed_source)
  processed_source.tokens.each_cons(2) do |t1, t2|
    next unless t2.type == :tCOMMENT
    next unless t1.pos.line == t2.pos.line
    add_offense(t2.pos, t2.pos) if t1.pos.end == t2.pos.begin
  end
end