5438     $def(self, '$raise', function $$raise(exception, string, backtrace) {  argument
5445       if (backtrace == null) backtrace = nil;
5467       if (backtrace !== nil) {
5468         exception.$set_backtrace(backtrace);
5871     function correct_backtrace(backtrace) {  argument
5874       for (var i = 0; i < backtrace.length; i++) {
5875         var loc = backtrace[i];
5904       if (self.backtrace) {
5906         return self.backtrace;
5909       var backtrace = self.stack;
5911       if (typeof(backtrace) !== 'undefined' && backtrace.$$is_string) {
5912         return self.backtrace = correct_backtrace(backtrace.split("\n"));
5914       else if (backtrace) {
5915         return self.backtrace = correct_backtrace(backtrace);
5953       if (self.backtrace) cloned.backtrace = self.backtrace.$dup();
6025     $def(self, '$set_backtrace', function $$set_backtrace(backtrace) {  argument
6031       if (backtrace === nil) {
6032         self.backtrace = nil;
6034       } else if (backtrace.$$is_string) {
6035         self.backtrace = [backtrace];
6036         self.stack = '  from ' + backtrace;
6038         if (backtrace.$$is_array) {
6039           for (i = 0, ii = backtrace.length; i < ii; i++) {
6040             if (!backtrace[i].$$is_string) {
6053         self.backtrace = backtrace;
6054         self.stack = $send((backtrace), 'map', [], function $$4(i){
6060       return backtrace;