Here is a test case that happens :
the first warning should be an error, but I disable it. The point is that you can convert from the F to void*, but not in the context of line 7. Line 6 represents the problem I am having compiling.


test3.c:4: warning: incompatible types in assignment2
test3.c:6: no conversion from `int (S )' to `int (S , S *)'
test3.c:7: no conversion from `int (S )' to `void *'
-------------------------------
struct S;
int F(struct S *);
int foo(){
  void * pf= &F;
  int  (f1)(struct S ,struct S ) =((int () (struct S ,struct S ))pf);
  int  (f2)(struct S ,struct S ) =((int () (struct S ,struct S ))F);
 int  (f3)(struct S ,struct S ) =((int () (struct S ,struct S ))(void*)F);
}