Example jsFiddle: http://jsfiddle.net/h9VRc/2/

Results in error: Uncaught RangeError: Maximum call stack size exceeded

Apparently the problem is in the select function:

// POS handling

if (matchExpr["POS"].test(selector)) {

return handlePOS(match, context, results, seed);

}

where the regex is :

/:(nth|eq|gt|lt|first|last|even|odd)(?:\\(((?:-\\d)?\\d*)\\)|)(?=[^-]|$)/gi

which matches selectors that contain "unintended" pseudo selectors like the one in the summary.