[Bug libstdc++/91495] std::transform_reduce with unary op is implemented in the parallel case but not the basic case

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91495

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No (the parallel versions are in those branches either).