[Bug libstdc++/88170] [9 Regression] pretty printer FAILs

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88170

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Looks like these warnings were mentioned in PR 87634 comment 4, but nobody
noticed the resulting test failures.