Warning when passing int, but unsigned int is awaited?

[Robert William Fuller]

John Love-Jensen wrote:
> It works on my compiler.  Using C.

It works for some value of work on gcc-4.1.2.  It reports on things that 
clearly have no width difference.  Am I detecting a theme with these 
less used compiler warnings?  (Note that -Wunreachable-code reports 
erroneously as well.)

> I think the -Wconversion feature was busted (perhaps still is busted) for