https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102044
--- Comment #2 from qingzhe huang <nickhuang99 at hotmail dot com> --- The root cause of this issue maybe similar to those PR102033, PR102034, PR102042 etc., however, this is still a distinctive case because of its nature. It is not a "typename" indicating its a dependent-type, rather using "decltype". So, in this sense, to tackle this issue may need a different approach. Currently I haven't found a similar function to resolve "decltype" type similar to "resolve_typename_type". If anybody knows one, please let me know.