annoying -Wshadow warning

[Doug Evans]

Is there any usefulness to this particular situation of the -Wshadow warning?

foo.c:
void debug (void);
void foo (char* debug);

casey:~$ gcc-3.0.4 -c -Wshadow foo.c
foo.c:2: warning: declaration of `debug' shadows global declaration
casey:~$ 

Print the warning at the definition site of foo, yes!
But at the prototype site?