https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117281
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
New reduced testcase:
```
template<typename...> struct always_string{};
template<typename> concept t = true;
template<template<typename, t> typename T> struct triggers_bug {
T<int, long> value;
};
triggers_bug<always_string> bad;
```
To show it is unrelated to a type alias.
