Comment 2 for bug 867645

StacktraceTop:
 g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7f0121456540 "gjs_object_instance_constructor", message=0x3f7ead0 "assertion failed: (unthreadsafe_template_for_constructor.info == NULL || strcmp(g_base_info_get_name( (GIBaseInfo*) priv->info), g_base_info_get_name( (GIBaseInfo*) unthreadsafe_template_for_construct"...) at /build/buildd/glib2.0-2.30.0/./glib/gtestutils.c:1425
 g_assertion_message_expr (domain=0x0, file=0x7f0121455e1e "gi/object.c", line=671, func=0x7f0121456540 "gjs_object_instance_constructor", expr=<optimized out>) at /build/buildd/glib2.0-2.30.0/./glib/gtestutils.c:1436
 gjs_object_instance_constructor (context=0x1b0a830, argc=1, vp=0x7f01063dc260) at gi/object.c:668
 CallJSNative (vp=<optimized out>, argc=<optimized out>, native=<optimized out>, cx=0x1b0a830) at jscntxtinlines.h:701
 CallJSNativeConstructor (vp=<optimized out>, argc=<optimized out>, native=<optimized out>, cx=0x1b0a830) at jscntxtinlines.h:720