skip_inner_expression

# File lib/rdoc/parser/ruby.rb, line 1241
  def skip_inner_expression
    res = ""
    nest = 0
    while (ch = getc)
      res << ch
      if ch == '}'
        break if nest.zero?
        nest -= 1
      elsif ch == '{'
        nest += 1
      end
    end
    res
  end