124       $gvars["@"] = exception.$backtrace();
4506 …,print,format,puts,<=,length,[],readline,<,first,split,to_str,exception,backtrace,rand,respond_to_…
4631       stack = new Error().$backtrace();
5268     $def(self, '$raise', function $$raise(exception, string, backtrace) {  argument
5272       if (backtrace == null) backtrace = nil;
5292       if (backtrace !== nil) {
5293         exception.$set_backtrace(backtrace);
5301       $gvars["@"] = (exception).$backtrace();
5614 …Opal.add_stubs('new,map,backtrace,clone,to_s,merge,tty?,[],include?,raise,dup,empty?,!,caller,shif…
5670     // Convert backtrace from any format to Ruby format
5671     function correct_backtrace(backtrace) {  argument
5674       for (var i = 0; i < backtrace.length; i++) {
5675         var loc = backtrace[i];
5697     $def(self, '$backtrace', function $$backtrace() {
5701       if (self.backtrace) {
5702         // nil is a valid backtrace
5703         return self.backtrace;
5706       var backtrace = self.stack;
5708       if (typeof(backtrace) !== 'undefined' && backtrace.$$is_string) {
5709         return self.backtrace = correct_backtrace(backtrace.split("\n"));
5711       else if (backtrace) {
5712         return self.backtrace = correct_backtrace(backtrace);
5724 …self.backtrace_locations = ($a = self.$backtrace(), ($a === nil || $a == null) ? nil : $send($a, '…
5750       if (self.backtrace) cloned.backtrace = self.backtrace.$dup();
5783       }      bt = self.$backtrace().$dup();
5813     $def(self, '$set_backtrace', function $$set_backtrace(backtrace) {  argument
5819       if (backtrace === nil) {
5820         self.backtrace = nil;
5822       } else if (backtrace.$$is_string) {
5823         self.backtrace = [backtrace];
5824         self.stack = '  from ' + backtrace;
5826         if (backtrace.$$is_array) {
5827           for (i = 0, ii = backtrace.length; i < ii; i++) {
5828             if (!backtrace[i].$$is_string) {
5838           $Kernel.$raise($$$('TypeError'), "backtrace must be Array of String");
5841         self.backtrace = backtrace;
5842         self.stack = $send((backtrace), 'map', [], function $$4(i){
5848       return backtrace;