[Bug c++/40752] -Wconversion generates false warnings for operands not larger than target type

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40752

--- Comment #30 from Jason Merrill <jason at gcc dot gnu.org> ---
New patch: https://gcc.gnu.org/ml/gcc-patches/2020-01/msg00624.html