fix up typeRepr handling

src/runtime/objmodel.cpp

@@ -352,6 +352,8 @@ BoxedClass::BoxedClass(BoxedClass* metaclass, BoxedClass* base, gcvisit_func gc_
     memset(&tp_name, 0, (char*)(&tp_version_tag + 1) - (char*)(&tp_name));
     tp_basicsize = instance_size;
 
+    tp_flags |= Py_TPFLAGS_HEAPTYPE;
+
     if (metaclass == NULL) {
         assert(type_cls == NULL);
     } else {

src/runtime/types.cpp

@@ -607,13 +607,14 @@ extern "C" int PySlice_GetIndicesEx(PySliceObject* r, Py_ssize_t length, Py_ssiz
 }
 
 Box* typeRepr(BoxedClass* self) {
-    if (isUserDefined(self)) {
     std::ostringstream os;
+    if ((self->tp_flags & Py_TPFLAGS_HEAPTYPE) && isUserDefined(self))
         os << "<class '";
+    else
+        os << "<type '";
 
     Box* m = self->getattr("__module__");
-        RELEASE_ASSERT(m, "");
-        if (m->cls == str_cls) {
+    if (m && m->cls == str_cls) {
         BoxedString* sm = static_cast<BoxedString*>(m);
         os << sm->s << '.';
     }
@@ -627,11 +628,6 @@ Box* typeRepr(BoxedClass* self) {
     os << "'>";
 
     return boxString(os.str());
-    } else {
-        char buf[80];
-        snprintf(buf, 80, "<type '%s'>", getNameOfClass(self)->c_str());
-        return boxStrConstant(buf);
-    }
 }
 
 Box* typeHash(BoxedClass* self) {