parse_symbol_in_arg

# File lib/rdoc/parsers/parse_rb.rb, line 2596
    def parse_symbol_in_arg
      case tk = get_tk
      when TkSYMBOL
        tk.text.sub(/^:/, '')
      when TkSTRING
        eval @read[-1]
      else
        warn("Expected symbol or string, got #{tk.inspect}") if $DEBUG
        nil
      end
    end