[Bug libstdc++/107811] libstdc++-v3/src/c++17/floating_from_chars.cc:787:9: error: 'fast_float' has not been declared

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107811

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes it does