Save the str in the striterator

src/runtime/builtin_modules/gc.cpp

@@ -40,7 +40,7 @@ static Box* enable() {
 void setupGC() {
     BoxedModule* gc_module = createModule("gc", "__builtin__");
 
-    gc_module->giveAttr("__hex__", new BoxedBuiltinFunctionOrMethod(boxRTFunction((void*)gcCollect, NONE, 0)));
+    gc_module->giveAttr("collect", new BoxedBuiltinFunctionOrMethod(boxRTFunction((void*)gcCollect, NONE, 0)));
     gc_module->giveAttr("isenabled", new BoxedBuiltinFunctionOrMethod(boxRTFunction((void*)isEnabled, BOXED_BOOL, 0)));
     gc_module->giveAttr("disable", new BoxedBuiltinFunctionOrMethod(boxRTFunction((void*)disable, NONE, 0)));
     gc_module->giveAttr("enable", new BoxedBuiltinFunctionOrMethod(boxRTFunction((void*)enable, NONE, 0)));

src/runtime/str.cpp

@@ -1721,7 +1721,7 @@ public:
     BoxedString* s;
     std::string::const_iterator it, end;
 
-    BoxedStringIterator(BoxedString* s) : it(s->s.begin()), end(s->s.end()) {}
+    BoxedStringIterator(BoxedString* s) : s(s), it(s->s.begin()), end(s->s.end()) {}
 
     DEFAULT_CLASS(str_iterator_cls);
 

test/tests/str_functions.py

@@ -116,3 +116,7 @@ test_just_funcs("abcde", 5)
 test_just_funcs("abcde", 6)
 test_just_funcs("abcde", 7)
 test_just_funcs("abcde", 8)
+
+import gc
+for c in "hello world":
+    gc.collect()