[Bug c/116871] -Wincompatible-pointer-types for function pointers could highlight the mismatch better

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116871

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
tbh, I actually think we could do a bit better again and somehow annotate &f in
the diagram and colourise the 'float' vs 'int'?