Fix nested closures

src/codegen/irgen/irgenerator.cpp

@@ -1328,6 +1328,7 @@ private:
             llvm::Value* closureValue = closure->makeConverted(emitter, CLOSURE)->getValue();
             for (int i = 0; i < deref_info.num_parents_from_passed_closure; i++) {
                 closureValue = emitter.getBuilder()->CreateLoad(getClosureParentGep(emitter, closureValue));
+                emitter.setType(closureValue, RefType::BORROWED);
             }
             llvm::Value* lookupResult
                 = emitter.getBuilder()->CreateLoad(getClosureElementGep(emitter, closureValue, deref_info.offset));

src/runtime/types.cpp

@@ -4013,6 +4013,8 @@ void BoxedClosure::dealloc(Box* _o) noexcept {
         Py_XDECREF(o->elts[i]);
     }
 
+    Py_XDECREF(o->parent);
+
     o->cls->tp_free(o);
 }
 

test/tests/locals_test.py

 # expected: reffail
+# - locals() returns None for undefined values due to the changes refcounting made to how we store uninitialized variables.
 def f1():
     l = []
     for i in xrange(5):