class ERB::Compiler::TrimScanner

def percent_line(line, &block)
  if @stag || line[0] != ?%
    return @scan_line.call(line, &block)
  end
  line[0] = ''
  if line[0] == ?%
    @scan_line.call(line, &block)
  else
    yield(PercentLine.new(line.chomp))
  end
end