}
sb.append(")");
SixModelObject info = infos.at_pos_boxed(tc, 0);
SixModelObject returnType = info.at_key_boxed(tc, "typeobj");
ArgType returnInfo = getArgType(tc, info, true);
Class<?> javaReturn = null;
if (!isVoid) javaReturn = javaType(tc, getArgType(tc, info, true), returnType);
sb.append(isVoid? "V": Type.getDescriptor(javaReturn));
String sig = sb.toString();
Class<CallbackHandler> handlerClass = callbackClasses.get(sig);