[Bug c++/88020] Deduction guides fail inside sizeof

[toe-ger at web dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88020

--- Comment #1 from toe-ger at web dot de ---
The godbolt link is a bit confusing because the output window is in the wrong
place. https://godbolt.org/z/OvlkUA is better.