# File lib/math_ml/util.rb, line 340
                def parse_single_command(src, parser=nil)
                        s = src[SINGLE_COMMAND_RE, 1]
                        parser = latex_parser unless parser
                        begin
                                parser.parse(s)
                        rescue MathML::LaTeX::ParseError => e
                                src[SINGLE_COMMAND_RE, 2]
                        end
                end