if (xnode.getQType()==Node.TYPE_STRING) {
/*
* (dequeue! "ABC") -> "A"
*/
xnode.requireAccessType(Node.ACCESSVTYPE_MUTABLE_WRITELOCK);
if (xnode.getString().length() < 1)
throw new InterpreterException(StdErrors.Empty_string);
String tstr = xnode.getString();
String le = tstr.substring(0, 1);
xnode.setString(tstr.substring(1, tstr.length()));