function buildParser($parser)
 {
     $class = 'Parser' . sha1($parser);
     echo ParserCompiler::compile("class {$class} extends \\PhpPeg\\Parser {\n {$parser}\n}") . "\n\n\n";
     eval(ParserCompiler::compile("class {$class} extends \\PhpPeg\\Parser {\n {$parser}\n}"));
     return new ParserTestWrapper($this, $class);
 }